This subject has developed intensively in several contexts in the six years since the last excellent review in this series (26). Other specialist or general reviews appearing since that time (27, 1 1 4, l iS, 1 40, 252) supplement the present work in different directions. I have attempted to deal comparatively with the three main subjects, since underlying principles and interesting developments tend to be shared or conÂ trasted over a wide phylogenetic range. I have excluded dissimilatory systems and referred to bacteria in limited relevant or comparative contexts. I express regret to friends and authors for deliberate or accidental omissions, for errors or inaccuracies, and for the condensed style. NITRATE REDUCTASE Enzyme Systems Well-known systems have been thoroughly reviewed (26, 27, 1 1 5, 122, 140), but flavin and iron and sulfide components, constitution, and assembly merit further attention. In Chlor ella vulgaris (Berlin strain) no flavin presence or need was iniÂ tially detected in pure NADH-dependent enzymes which contained an essential cytochrome bm carrier (308, 309,338) as in N. crassa (91, 92) and probably I atom molybdenum (306). The C. /usca (syn. pyrenoidosa) enzyme responded to added FAD (Km 2.5 fJoM) (286) for activity or
Annual Review of Plant Biology – Annual Reviews
Published: Jun 1, 1975
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