Download e-book for iPad: Amino Acids and Derivatives. A Comprehensive Treatise by P. K. Stumpf, B.J. Miflin

By P. K. Stumpf, B.J. Miflin

ISBN-10: 0126754055

ISBN-13: 9780126754056

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Extra resources for Amino Acids and Derivatives. A Comprehensive Treatise

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D. D. - 1 to - 3 - 1 to - 3 12 9400 [4Fe4S] 18,000 18,000 24,000 6000 8800 8800 Functional oxidation levels Ref­ erence 4 11 13 {Continued) 38 M. G. Yates TABLE VII (Continued) Organism Photosynthetic R. rubrum ferredoxin I ferredoxin II ferredoxin III ferredoxin IV Chromatium A. D. D. -341 - 3 8 0 + 355 - 1 to - 1 to - 2 to -Ito -340 -325 Ref­ erence 14 15 -3 -3 -3 -2 16 1 1 17 18 18 - 2 to - 3 Flavodoxins Redox potential Organism C. pasteurianum D. gigas D. vulgaris K. pneumoniae A. vinelandii R.

There is little evidence to indicate the possible roles of ferredoxins in other organisms. , 1977a), although it must be emphasized that an organism should only be classified as incapable offixingnitrogen after exhaustive tests under a variety of growth conditions. The possibility that extra ferredoxins arise as artifacts of purification pro­ cedures cannot be discounted in some cases. , 1978) and also in the size, FeS content, physical location and physiological condiTABLE VII Ferredoxins and Flavodoxins in Nitrogen-Fixing Bacteria Organism Anaerobic bacteria C.

Y 1978). In addition, if the MoFe protein contains two Mo atoms per molecule, are these present in one or two active centres for substrate reduc­ tion? Knowledge through EXAFS about the structure of the active ironmolybdenum cofactor (FeMoco) should help to resolve this question, but it must be recognised that the properties of isolated chemical complexes can be altered considerably by surrounding ligands in proteins. y 1975). Another unresolved question is the number of electrons transferred to the MoFe protein in each oxidation of the Fe protein during catalysis.

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Amino Acids and Derivatives. A Comprehensive Treatise by P. K. Stumpf, B.J. Miflin


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