Mutagenesis of methionine-183 drastically affects the physicochemical properties of cytochrome c1 of the bc1 complex of Rhodobacter capsulatus.
1992
Site-directed mutagenesis was used to investigate which of the highly conserved methionine residues (M183 and M205) provides the sixth axial ligand to the heme Fe in the cyt c 1 subunit of the bc 1 complex from the bacterium Rhodobacter capsulatus. These residues were changed to leucine (cM183L) and valine (cM205V). Two additional mutants were constructed, 1 in which a stop codon was inserted at M205 (cM205 * ) and the second in which 127 amino acids were deleted between the signal sequence and the putative C-terminal transmembrane α-helix (cΔfuI)
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