The autoreducible cytochromes c of the methylotrophs Methylophilus methylotrophus and Pseudomonas AM1

The two types of soluble cytochrome c (cytochrome cH and cytochrome cL) found in methylotrophs are completely distinct proteins; one type is not a dimer or degradation product of the other. Free thiol groups are probably not involved in the unusually rapid autoreduction of the cytochromes at high pH...

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Bibliographic Details
Published inBiochemical journal Vol. 207; no. 1; pp. 161 - 165
Main Authors Beardmore-Gray, M, O'Keeffe, D T, Anthony, C
Format Journal Article
LanguageEnglish
Published England 01.10.1982
Subjects
Alcohol Oxidoreductases - metabolism
Amino Acids - analysis
Circular Dichroism
Cytochrome c Group - metabolism
Endopeptidases
Methylococcaceae - analysis
Molecular Weight
Oxidation-Reduction
Pseudomonas - analysis
Spectrophotometry, Infrared
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ISSN0264-6021
1470-8728
DOI10.1042/bj2070161

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Summary:The two types of soluble cytochrome c (cytochrome cH and cytochrome cL) found in methylotrophs are completely distinct proteins; one type is not a dimer or degradation product of the other. Free thiol groups are probably not involved in the unusually rapid autoreduction of the cytochromes at high pH. The axial ligands to the haem iron, histidine and methionine, are the same as in other low-spin cytochromes c. The methionine ligand is displaced at high pH by an alternative strong-field ligand. This displacement does not occur on reduction of cytochrome cL by methanol dehydrogenase, but this does not rule out the possibility that the autoreduction mechanism is involved in the interaction of the dehydrogenase and cytochrome c.
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ISSN:0264-6021
1470-8728
DOI:10.1042/bj2070161