Tryptophan metabolism via kynurenine pathway plays a critical role in both health and a variety of human diseases. This book highlights the known associations between kynurenine pathway and various disease states, as well as examines the current status of drug development and clinical trials of compounds known to alter tryptophan metabolism. The research plays a critical role in molecular targeted therapies directed at altering the kynurenine pathway of tryptophan metabolism. The initial and rate-limiting step of tryptophan metabolism is mediated by one of two enzymes, tryptophan-2,3-dioxygenase (TDO; predominantly in the liver, but also in the brain) and indoleamine-2,3-dioxygenase (IDO; in a host of tissues in response to immune activation). Targeting the enzymes IDO and TDO, as well as other downstream effectors would therefore be likely to generate novel treatment options that would be helpful in a wide variety of clinical settings. This book provides a unique bridge between basic mechanistic understanding of the role of the kynurenine pathway with translational applications and clinical relevance. It will explore the indications that tryptophan metabolism is a potential biomarker of disease activity, can contribute to local and possibly systemic immune suppression in cancer, and is an attractive target for which a variety of inhibitors are readily available.

The lipid-rich and otherwise challenging nature of many key tissues complicates many aspects of current research, and applications of the unique nature of lipoproteins and their biological effects has engendered unique and vital methodologies. In Lipoproteins and Cardiovascular Disease: Methods and Protocols, experts in the field present a compendium of advanced and classical molecular biology methods targeted towards lipoprotein, atherosclerosis, and vascular biology research, bringing together in a single volume an updated set of protocols and strategies for methods now driving the most recent advances, along with classical methods that are still widely used. Among the many topics covered in this cutting-edge work, the book delves into crucial techniques such as quantitative real-time PCR, microarrays, RT-PCR laser capture microdissection, and tissue-specific gene overexpression, knockout, and knockdown methodologies, including AAV as a liver-directed gene delivery vehicle. Written in the highly successful Methods in Molecular Biology (TM) series format, chapters include introductions to their respective subjects, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and valuable notes which highlight tips on troubleshooting and avoiding known pitfalls. Comprehensive and easy to use, Lipoproteins and Cardiovascular Disease: Methods and Protocols serves both novices and experts alike as a complete guide for any researcher with an interest in lipoproteins and their significant biological effects.

During the past decade as the data on gene sequences and expression patterns rapidly accumulated, cell-free protein synthesis technology has also experienced a revolution, becoming a powerful tool for the preparation of proteins for their functional and structural analysis. In Cell-Free Protein Production: Methods and Protocols, experts in the field contribute detailed techniques, the uses of which expand deep into the studies of biochemistry, molecular biology, and biotechnology. Beginning briefly with basic methods and historical aspects, the book continues with thorough coverage of protein preparation methods, the preparation of proteins that are generally difficult to prepare in their functional forms, applications of the cell-free technologies to protein engineering, as well as some methods that are expected to constitute a part of future technologies. Written in the highly successful Methods in Molecular Biology (TM) series format, the chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and notes on troubleshooting and avoiding known pitfalls. Authoritative and cutting-edge, Cell-Free Protein Production: Methods and Protocols aims to help researchers continue the growth of the vital exploration of cell-free sciences and technologies in order to better understand the dynamic lives of cells.

Cellular adhesion is a fundamental process that influences numerous biological activities such as morphogenesis, cell motility and division, as well as signalling. In addition, adhesion is a process important not only in normal physiology and development, but also in disease states such as tumourigenesis, cardiovascular disease, inflammation and infection. There are a plethora of proteins involved in adhesion-related events with a huge diversity in function. As a result, a wide variety of techniques exist to study adhesion related proteins and processes. In Adhesion Protein Protocols, Third Edition, chapters cover techniques to gain insight into the complex and incompletely understood processes that are involved in cellular adhesion. Written in the successful Methods in Molecular Biology series format, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible protocols, and notes on troubleshooting and avoiding known pitfalls. Authoritative and easily accessible, Adhesion Protein Protocols, Third Edition will be useful for both those new to the field of adhesion protein research as well as the more experienced scientist.

This detailed volume focuses on methods for the characterization of aggregation processes that lead to the formation of amyloid fibrils and amyloid oligomers which feature in the etiology of a variety of human disorders collectively known as amyloidoses. The scope of the collection includes techniques for visualizing early steps on the amyloid formation pathway, methods for capturing and characterizing oligomeric, potentially toxic, intermediates, strategies for preparing and characterizing mature amyloid fibrils and approaches for understanding templating and transmission of amyloid aggregates. Written in the highly successful Methods in Molecular Biology series format, the chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols and tips on troubleshooting and avoiding known pitfalls. Authoritative and practical, Protein Amyloid Aggregation: Methods and Protocols serves as an ideal guide for biochemists and biophysicists with an interest in elucidating the mechanisms of protein amyloid formation, as well as chemists, pharmacologists and clinicians with an interest in leveraging an understanding of such mechanisms for the purpose of therapeutic development.

The basic principle of electron crystallography is to calculate a 3D density map by combining the amplitudes obtained from electron diffraction patterns with the experimental phases calculated from images of two-dimensional crystals of membrane or soluble proteins. This technology is very well developed and has produced a number of atomic models of membrane proteins in a lipid environment. Focused on comprehensive experimental protocols, Electron Crystallography of Soluble and Membrane Proteins: Methods and Protocols covers the entire range of techniques used in electron crystallography, including protein sample preparation, 2D crystallization, and screening in negative stain over electron cryo-microscopy (cryo-EM) and data processing, as well as modeling of conformational changes. Additional chapters provide perspective on past, present, and future challenges as well as complementary methods. Written for the popular Methods in Molecular Biology (TM) series, the work contains the kind of detailed descriptions and implementation advice necessary to ensure successful results. Comprehensive and cutting-edge, Electron Crystallography of Soluble and Membrane Proteins: Methods and Protocols serves laboratories new to the methods as well as state-of-the-art facilities pursuing this exciting area of protein science.

How and why certain proteins misfold and how this misfolding is linked to many disease processes has become a well-documented topic of study. Protein Misfolding and Cellular Stress in Disease and Aging: Concepts and Protocols moves beyond the basics to emphasize the molecular effects of protein misfolding at a cellular level, to delineate the impacts and cellular reactions that play a role in pathogenetic mechanisms, and to pinpoint possible manipulations and treatment strategies that can counteract, modify, or delay the consequences of misfolding. The volume begins with several concepts and approaches developed in the recent past including a connection to the research field of aging, where protein misfolding diseases have been equated to premature aging processes, and the book's coverage continues with detailed descriptions of protocols for relevant experimental approaches. Written in the highly successful Methods in Molecular Biology (TM) series format, protocols chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and tips on troubleshooting and avoiding known pitfalls. Authoritative and cutting-edge, Protein Misfolding and Cellular Stress in Disease and Aging: Concepts and Protocols aims to aid researchers in the field, as well as medical professionals and molecular biologists, in shaping and performing research related to this intriguing and vital subject.

In Fluorescent Protein-Based Biosensors: Methods and Protocols, experts in the field have assembled a series of protocols describing several methods in which fluorescent protein-based reporters can be used to gain unique insights into the regulation of cellular signal transduction. Genetically encodable fluorescent biosensors have allowed researchers to observe biochemical processes within the endogenous cellular environment with unprecedented spatiotemporal resolution. As the number and diversity of available biosensors grows, it is increasingly important to equip researchers with an understanding of the key concepts underlying the design and application of genetically encodable fluorescent biosensors to live cell imaging. Written in the successful Methods in Molecular Biology series format, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible protocols, and notes on troubleshooting and avoiding known pitfalls. Authoritative and easily accessible, Fluorescent Protein-Based Biosensors: Methods and Protocols promises to be a valuable resource for researchers interested in applying current biosensors to the study of biochemical processes in living cells as well as those interested in developing novel biosensors to visualize other cellular phenomena.

Carbohydrate microarrays emerged as a key technology for the deciphering of the glycospace by providing a multiplex technology where tens to hundreds of carbohydrates/protein interactions can be probed in parallel. Carbohydrate Microarrays: Methods and Protocols aims to give the reader the theoretical and experimental clues necessary for the fabrication and implementation of carbohydrate microarrays. This requires three essential steps: 1) to obtain the carbohydrate probes (monosacharides, oligosacchrides, polysacchairdes, glycoconjugates or glycoclusters), 2) to immobilize these probes, and 3) to implement the protocols for biological/biochemical interaction with the desired target. This volume gives an overview of carbohydrate microarray and carbohydrate chemistry and illustrates different detection techniques and their applications. Written in the successful Methods in Molecular Biology (TM) series format, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible protocols, and notes on troubleshooting and avoiding known pitfalls. Authoritative and easily accessible, Carbohydrate Microarrays: Methods and Protocols compiles a catalogue of protocols on carbohydrate microarrays to span the needs of researchers around the globe.

Immunology has made significant progress in the past decade, driven forward by rapidly advancing technology and a renewed interest in the vast realm of innate immunity. The receptors that mediate these functions are at the front lines of both protective and regulative roles of the immune system. In Immune Receptors: Methods and Protocols, expert researchers present a variety of experimental approaches to the characterization of immune receptors and the cell biology that mediates their functions. These include imaging techniques that aim to understand receptor localization and trafficking, techniques to measure receptor-ligand interactions, strategies to identify novel ligands and methods to analyze downstream receptor signaling, as well as strategies for genomic and proteomic characterization of receptor repertoires. Written in the highly successful Methods in Molecular Biology (TM) series format, chapters include introductions to their respective subjects, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and tips on troubleshooting and avoiding known pitfalls. Authoritative and practical, Immune Receptors: Methods and Protocols offers technical descriptions and protocols that will be useful both to investigators who are interested in carrying out these procedures and to those who seek a deeper understanding of the bench science that lies behind the immunology literature.

Transcriptional regulation controls the basic processes of life. Its complex, dynamic, and hierarchical networks control the momentary availability of messenger RNAs for protein synthesis. Transcriptional regulation is key to cell division, development, tissue differen- ation, and cancer as discussed in Chapters 1 and 2. We have witnessed rapid, major developments at the intersection of computational biology, experimental technology, and statistics. A decade ago, researches were struggling with notoriously challenging predictions of isolated binding sites from low-throughput experiments. Now we can accurately predict cis-regulatory modules, conserved cl- ters of binding sites (Chapters 13 and 15), partly based on high-throughput ch- matin immunoprecipitation experiments in which tens of millions of DNA segments are sequenced by massively parallel, next-generation sequencers (ChIP-seq, Chapters 9, 10, and 11). These spectacular developments have allowed for the genome-wide mappings of tens of thousands of transcription factor binding sites in yeast, bacteria, mammals, insects, worms, and plants. Please also note the no less spectacular failures in many laboratories around the world.

The use of proteomics to study complex diseases such as cardiovascular disease, the leading cause of death in developed countries, has grown exponentially in recent years. Proteomics is a rapidly expanding investigation platform in cardiovascular medicine and is becoming integrated and incorporated into cardiovascular research. The proteomics field continues to develop with major improvements in mass spectrometry instrumentation, methodology and data analysis. Heart Proteomics: Methods and Protocols complies a selection of techniques and methods that target the numerous processes implicated in the pathophysiology of heart. Chapters cover protocols and updated methods in the heart proteomic area with a particular focus on MS-based methods of protein and peptide quantification and the analysis of posttranslational modifications as well as descriptions of system biology approaches, which provide a better understanding of normal and pathological processes. Written in the successful Methods in Molecular Biology (TM) series format, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible protocols, and notes on troubleshooting and avoiding known pitfalls. Authoritative and easily accessible, Heart Proteomics: Methods and Protocols is a representative selection of methods that will prove to be a useful resource for experienced proteomics practitioners and newcomers alike.

Beginning from centuries of anecdotal descriptions of cell death, such as those on the development of the midwife toad in 1842 by Carl Vogt, to modern-day investigations of cell death as a biological discipline, it has become accepted that cell death in multicellular organisms is a normal part of life. This book provides a comprehensive view of cell death, from its mechanisms of initiation and execution, to its implication in human disease and therapy. Physiological cell death plays critical roles in almost all aspects of biology, and the book details its roles in lymphocyte homeostasis, neuronal function, metabolism, and the DNA damage response. When physiological cell death goes awry, diseases can arise, and cancer is presented as a central paradigm for the consequences of derangements in the interplay between cell survival and cell death. At the same time, the potential promise of targeted therapies aimed at interdicting cell death machineries are also discussed extensively. The molecular mechanisms that underlie apoptotic cell death are illustrated from the perspectives of both the intrinsic, mitochondrial apoptotic pathway and the extrinsic, death receptor pathway. Key players in these pathways, such as the Bcl2 family proteins, cytochrome c, Apaf-1, caspases, death receptor adapter proteins, and inhibitor of apoptosis proteins, are presented from both functional and structural angles. Until only a few years ago, programmed cell death has been considered essentially synonymous with apoptosis. However, we now know that programmed cell death can also take other forms such as necrosis or necroptosis, and to this end, the mechanisms that underlie programmed necrosis in development and host defense are illustrated. The past twenty plus years have seen an incredible growth of research in cell death, with one breakthrough after another, and the legacy still goes on with constant new surprises and findings. Long live cell death!

Proteomics by means of mass spectrometry has rapidly changed the way that we analyze proteomes. Gel-Free Proteomics: Methods and Protocols addresses contemporary methods for gel-free proteome research with a special focus on differential analysis and protein modifications. Divided into twenty-five chapters, this detailed volume meticulously describes vital procedures needed to perform gel-free proteomics, ranging from sample preparation, isotope labeling for differential proteomics, enrichment technologies for modified proteins and peptides, and bioinformatics. Written in the successful Methods in Molecular Biology (TM) series format, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible protocols, and notes on troubleshooting and avoiding known pitfalls. Authoritative and easily accessible, Gel-Free Proteomics: Methods and Protocols serves as a timely resource for both professionals and novices pursing research in this critical field.

This book is intended for scientifc researchers, clinical laboratorians, clinical and translational scientists, and others interested in proteomics and biomarker discovery. Urine is one of the most easily accessible biological samples, and it provides a treasure trove of molecules important in clinical diagnostics. In this book, we review briefly the classical urine tests that are performed in the clinical laboratory and then delve into the state-of-the-art methods for proteomic analysis using urine specimens. The most recent advances are discussed with regard to sample preparation, data analysis, and fnally methods and applications. A multitude of examples are provided including procedural details for the identifcation and characterization of urine biomarkers that hold potential for the diagnosis and treatment of many different disease conditions. The text is arranged so as to read systematically: introduction, sample preparation methods, applications, and data analysis. However, it does not necessarily require the reader to read it from start to fnish. Each chapter is organized such that it can be read individually without requiring knowledge from other chapters. I would like to thank the many individuals who made this book possible. These include the many authors who contributed to each of the individual chapters, the corresponding authors who took responsibility in providing the complete and fnished versions solicited for the peer review process, and the many scientifc reviewers who provided their valuable input and guidance.

Protein-protein interactions (PPIs) are strongly predictive of functional relationships among proteins in virtually all processes that take place in the living cell. Therefore, the comprehensive exploration of interactome networks is one of the major goals in systems biology. The aim of Two Hybrid Technologies: Methods and Protocols is to provide a compendium of state-of-the art protocols for the investigation of binary PPIs with the classical yeast two-hybrid (Y2H) approach, Y2H variants and other in vivo methods for PPI mapping. Divided into two convenient sections, the first gives a survey of protocols that are currently employed for Y2H high-throughput screens by different expert labs in the field. Rather than detailing the principles of screening, which have been described previously, the focus is on different implementations of Y2H interactome mapping. The second section of the book considers innovative PPI detection methods that have the potential to emerge as alternative high-throughput methodologies. Written in the highly successful Methods in Molecular Biology (TM) series format, chapters contain introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and notes on troubleshooting and avoiding known pitfalls. Authoritative and accessible, Two Hybrid Technologies: Methods and Protocols supplies researchers with a comprehensive toolbox for the identification of biologically relevant protein interactions.

Membrane proteins, representing nearly 40% of all proteins, are key components of cells involved in many cellular processes, yet only a small number of their structures have been determined. Membrane Protein Structure Determination: Methods and Protocols presents many detailed techniques for membrane protein structure determination used today by bringing together contributions from top experts in the field. Divided into five convenient sections, the book covers various strategies to purify membrane proteins, approaches to get three dimensional crystals and solve the structure by x-ray diffraction, possibilities to gain structural information for a membrane protein using electron microscopy observations, recent advances in nuclear magnetic resonance (NMR), and molecular modelling strategies that can be used either to get membrane protein structures or to move from atomic structure to a dynamic understanding of a molecular functioning mechanism. Written in the highly successful Methods in Molecular Biology (TM) series format, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and tips on troubleshooting and avoiding known pitfalls. Comprehensive and easy to use, Membrane Protein Structure Determination: Methods and Protocols serves as an ideal reference for scientists seeking to further our knowledge of these vital and versatile proteins as well as our overall understanding of the complicated world of cell biology.

Over the past decade, there has been an explosive development of research of intrinsically disordered proteins (IDPs), which are also known as unfolded proteins. Structural biologists now recognize that the functional diversity provided by disordered regions complements the functional repertoire of ordered protein regions. In Intrinsically Disordered Protein Analysis :Methods and Experimental Tools, expert researchers explore the high abundance of IDPs in various organisms, their unique structural features, numerous functions, and crucial associations with different diseases. Volume 1 includes sections on assessing IDPs in the living cell,NMR based techniques, vibrational spectroscopy, and other spectroscopic techniques. Written in the highly successful Methods in Molecular Biology (TM) series format, the chapters include the kind of detailed description and implementation advice that is crucial for getting optimal results in the laboratory. Thorough and intuitive, Intrinsically Disordered Protein Analysis: Methods and Experimental Tools helps scientists further their investigations of these fascinating and dynamic molecules.

Professor Fox's multi-volume Advanced Dairy Chemistry set was first published in four volumes in the early 1980s. A second edition came out in the early 1990s, and an updated third edition was published a decade later. The set is the leading major reference on dairy chemistry, providing in-depth coverage of milk proteins, lipids, and lactose. The editors propose beginning the revision cycle again, with a revised first volume on proteins, to be divided and published separately as Volume 1A - Proteins: Basics Aspects, and Volume 1B - Applied Aspects. Fox and his co-editor, Paul McSweeney, have created an extensively revised the Table of Contents for Volume 1A, which details the novel and updated chapters to be included in this upcoming fourth edition. New contributors include highly regarded dairy scientists and scholars from around the world.

Through the rapid development of proteomics methods and technologies, an enormous amount of data was created, leading to a wide-spread rethinking of strategy design and data interpretation. In Data Mining in Proteomics: From Standards to Applications, experts in the field present these new insights within the proteomics community, taking the historical evolution as well as the most important international standardization projects into account. Along with basic and sophisticated overviews of proteomics technologies, standard data formats, and databases, the volume features chapters on data interpretation strategies including statistics, spectra interpretation, and analysis environments as well as specialized tasks such as data annotation, peak picking, phosphoproteomics, spectrum libraries, LC/MS imaging, and splice isoforms. As a part of the highly successful Methods in Molecular Biology (TM) series, this work provides the kind of detailed description and implementation advice that is crucial for getting optimal results. Authoritative and cutting-edge, Data Mining in Proteomics: From Standards to Applications is a well-balanced compendium for beginners and experts, offering a broad scope of data mining topics but always focusing on the current state-of-the-art and beyond.

This book is devoted to the fascinating superfamily of plant ATP-binding cassette (ABC) transporters and their variety of transported substrates. It highlights their exciting biological functions, covering aspects ranging from cellular detoxification, through development, to symbiosis and defense. Moreover, it also includes a number of chapters that center on ABC transporters from non-Arabidopsis species. ABC proteins are ubiquitous, membrane-intrinsic transporters that catalyze the primary (ATP-dependent) movement of their substrates through biological membranes. Initially identified as an essential aspect of a vacuolar detoxification process, genetic work in the last decade has revealed an unexpectedly diverse variety of ABC transporter substrates, which include not only xenobiotic conjugates, but also heavy metals, lipids, terpenoids, lignols, alkaloids and organic acids. The discovery that members of the ABCB and ABCG family are involved in the movement of phytohormones has further sparked their exploration and provided a new understanding of the whole family. Accordingly, the trafficking, regulation and structure-function of ABCB-type auxin transporters are especially emphasized in this book.

It is increasingly clear that signal transduction is a highly organized and integrated process. Divided into two convenient sections, Signal Transduction Protocols, Third Edition focuses on experimental approaches to better understand the complexity of signal transduction. Introductory chapters provide perspective on several of the challenges involved in signal transduction research and offer guidance on selecting the best approaches to various types of questions. The individual chapters provide detailed experimental protocols covering various topics, from the effects of ligand binding on receptor conformation and effector coupling, to moving inside the cell in order to capture the spatial and temporal characteristics of signaling events. Written in the highly successful Methods in Molecular Biology (TM) series format, chapters contain introductions to their respective topics, lists of the necessary materials and reagents, step-by step, readily reproducible laboratory protocols, and notes on troubleshooting and avoiding known pitfalls. Authoritative and accessible, Signal Transduction Protocols serves as an ideal guide to scientists of all backgrounds and is a valuable resource for future progress in the field of signal transduction research.

Systems Biology represents a new paradigm aiming at a whole-organism-level understanding of biological phenomena, emphasizing interconnections and functional interrelationships rather than component parts. The study of network properties, and how they control and regulate behavior from the cellular to organism level, constitutes a main focus of Systems Biology. This book addresses from a novel perspective a major unsolved biological problem: understanding how a cell works and what goes wrong in pathology. The task undertaken by the authors is in equal parts conceptual and methodological, integrative and analytical, experimental and theoretical, qualitative and quantitative, didactic and comprehensive. Essentially, they unravel the spatio-temporal unfolding of interacting mass-energy and information networks at the cellular and organ levels, as well as its modulation through activation or repression by signaling networks to produce a certain phenotype or (patho)physiological response. Starting with the historical roots, in thirteen chapters this work explores the Systems Biology of signaling networks, cellular structures and fluxes, organ and microorganism functions. In doing so, it establishes the basis of a 21st century approach to biological complexity.

Recent findings have implied a distinct therapeutic potential for drugs targeting Transient Receptor Potential (TRP) channels in a wide variety of diseases, many with no existing satisfactory treatment options. Thus, the TRP superfamily of ion channels has attracted a great deal of well-deserved attention. TRP Channels in Drug Discovery provides a thorough collection of the most up-to-date reviews and protocols on the subject, coming from top experts in the field. Volume I presents a series of state-of-the-art minireviews on the most interesting TRP channels (from TRPA1 to TRPV4), as well as TRP-related protocols involving airways and the genitourinary tract. Written for the Methods in Pharmacology and Toxicology (TM) series, this work includes the kind of detailed description and key implementation advice that ensures successful results in the lab. Comprehensive and cutting-edge, TRP Channels in Drug Discovery serves as an ideal reference for graduate students in academic laboratories as well as for pharmaceutical scientists developing new drugs and clinicians interested in novel drugs in the pipeline.

This book provides a molecular view of membrane transport by means of numerous biochemical and biophysical techniques. The rapidly growing numbers of atomic structures of transporters in different conformations and the constant progress in bioinformatics have recently added deeper insights. The unifying mechanism of energized solute transport across membranes is assumed to consist of the conformational cycling of a carrier protein to provide access to substrate binding sites from either side of a cellular membrane. Due to the central role of active membrane transport there is considerable interest in deciphering the principles of one of the most fundamental processes in nature: the alternating access mechanism. This book brings together particularly significant structure-function studies on a variety of carrier systems from different transporter families: Glutamate symporters, LeuT-like fold transporters, MFS transporters and SMR (RND) exporters, as well as ABC-type importers. The selected examples impressively demonstrate how the combination of functional analysis, crystallography, investigation of dynamics and computational studies has made it possible to create a conclusive picture or more precisely, "a molecular movie". Although we are still far from a complete molecular description of the alternating access mechanism, remarkable progress has been made from static snapshots towards membrane transport dynamics.