A reassessment of the structure of Paracoccus cytochrome c-550 |
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| Authors: | R P Ambler T E Meyer M D Kamen S A Schichman L Sawyer |
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| Affiliation: | Department of Molecular Biology University of Edinburgh Edinburgh EH9 3JR, Scotland;Department of Chemistry University of California at San Diego La Jolla, Calif. 92093 U.S.A.;Department of Biophysics and Theoretical Biology University of Chicago Chicago, Ill. 60637 U.S.A.;Department of Chemistry Napier College Edinburgh EH10 5DT, Scotland |
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| Abstract: | An amino acid sequence and a three-dimensional structure of cytochrome c-550 from the facultatively denitrifying aerobic bacterium Paracoccus denitrificans have been reported (Timkovich et al., 1976; Timkovich &; Dickerson, 1976). The amino acid sequence showed considerable similarity to Rhodospirillaceae (purple phototrophic bacterial) cytochrome c2, but also had some unexpected features. We have reexamined the amino acid sequence and have found five discrepancies. The molecule contains an additional tryptophan residue, which was not detected in either the 2.5 Å crystallographic analysis or the original sequence investigation. |
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