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Default Solution conformation of cytochrome c-551 from Pseudomonas stutzeri ZoBell determined

Solution conformation of cytochrome c-551 from Pseudomonas stutzeri ZoBell determined by NMR.

Related Articles Solution conformation of cytochrome c-551 from Pseudomonas stutzeri ZoBell determined by NMR.

Biophys J. 1994 Sep;67(3):1207-15

Authors: Cai M, Timkovich R

1H NMR spectroscopy and solution structure computations have been used to examine ferrocytochrome c-551 from Pseudomonas stutzeri ZoBell (ATCC 14405). Resonance assignments are proposed for all main-chain and most side-chain protons. Stereospecific assignments were also made for some of the beta-methylene protons and valine methyl protons. Distance constraints were determined based upon nuclear Overhauser enhancements between pairs of protons. Dihedral angle constraints were determined from estimates of scalar coupling constants and intra-residue NOEs. Twenty structures were calculated by distance geometry and refined by energy minimization and simulated annealing on the basis of 1012 interproton distance and 74 torsion angle constraints. Both the main-chain and side-chain atoms are well defined except for two terminal residues, and some side-chain atoms located on the molecular surface. The average root mean squared deviation in the position for equivalent atoms between the 20 individual structures and the mean structure obtained by averaging their coordinates is 0.56 +/- 0.10 A for the main-chain atoms, and 0.95 +/- 0.09 A for all nonhydrogen atoms of residue 3 to 80 plus the heme group. The average structure was compared with an analogous protein, cytochrome c-551 from pseudomonas stutzeri. The main-chain folding patterns are very consistent, but there are some differences, some of which can be attributed to the loss of normally conserved aromatic residues in the ZoBell c-551.

PMID: 7811935 [PubMed - indexed for MEDLINE]



Source: PubMed
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