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Of the porphyrinoid structures occurring in nature the most
important and most widespread are the red blood pigment heme (1),
the green pigment of plant photosynthesis chlorophyll a (2), the
bacterial photo- synthetic pigment bacteriochlorophyll a (3), and
the "antipernicious" red pigment vitamin BJ2 (4). The basic
function of these cofactors are determined by the incorporation of
the different metal ions into the macrotetracycles. The different
oxidation levels of the macrocyclic ligand system regulate the fine
tuning of these functions. The final adaptation of the cofactors to
their special molecular environments in the cell compartments is
effected by variation of the substitution patterns of the
chromophores. HCO,C 3 CO,Phytyl 2 Heme Chlorophyll a CONH, CONH, ~
H,NOC 1 , CONH, /I(Y N~ 3 4 Bacteriochlorophyll a Vitamin B" HO
References, pp. 42-51 Naturally Occurring Cyclic Tetrapyrroles 3
Until the mid-1970s the four classic cyclic tetrapyrrolic
structures with their porphyrin, chi orin, bacteriochlorin, and
corrin skeletons were almost the only representatives in the class
of porphyrinoid natural products (1-10). Although other partially
reduced porphyrins were conceivable, none of these partially
saturated porphyrinoid structures had hitherto been found in
nature.
Contents: D. G. I. Kingston, A. A. Molinero, and J. M. Rimoldi: The
Taxane Diterpenoids. - Author Index. - Subject Index. The volumes
of this classic series, now referred to simply as "Zechmeister"
after its founder, L. Zechmeister, have appeared under the Springer
Imprint ever since the series' inauguration in 1938. The volumes
contain contributions on various topics related to the origin,
distribution, chemistry, synthesis, biochemistry, function or use
of various classes of naturally occurring substances ranging from
small molecules to biopolymers. Each contribution is written by a
recognized authority in his field and provides a comprehensive and
up-to-date review of the topic in question. Addressed to
biologists, technologists, and chemists alike, the series can be
used by the expert as a source of information and literature
citations and by the non-expert as a means of orientation in a
rapidly developing discipline.
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