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Trafficking Inside Cells - Pathways, Mechanisms and Regulation (Paperback, 2010 ed.)
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Trafficking Inside Cells - Pathways, Mechanisms and Regulation (Paperback, 2010 ed.)
Series: Molecular Biology Intelligence Unit
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The SecretoryPathway The transport ofproteins and lipids from their
site ofsynthesis at the endoplasmic reticu- lum (ER) to the
cellsurface ismediated by the secretory pathway and isan essential
process in eukaryotic organisms. A great variety ofmolecules are
extruded from cellsby the action ofthe secretory pathway, including
extracellular matrix components that provide the foundation for
constructing tissuesand organs. Moreover, this pathway playsa major
role in the biogenesisof the plasma membraneand itsexpansion before
celldivision. Therefore, withoutsecretion there would be no
cells,tissuesor organs, and so it issafeto saythat we oweourvery
existence to the secretory pathway. To understand the process
ofsecretion we must learn about the organelles that compose the
secretory pathway; the ER and Golgi apparatus, and the transport
vesicles these or- ganelles produce. The membrane ofthese
organelles is primarily synthesized and assembled at the ER but
with contributions from mitochondria (phosphatidylethanolamine) and
the Golgi apparatus (sphingolipids). Newly synthesized proteins
destined for secretion gain en- try into the secretory pathway by
translocation across the ER membrane. This translocation apparatus
also integrates proteins into the membrane and establishes their
topology with respect to the lipid bilayer (seeChapter 7). Many
secretory proteins are covalently modified with oligosaccharides to
produce glycoproteins, a biosynthetic process initiated in the ER
and continued in the Golgi apparatus. Once proteins are properly
folded and modified in the ER, they are allowed to leave and are
ushered into COPlI-coated carrier vesiclesforming at specific exit
sites (see Chapters 1 and 8).
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