PMID: 8606161Apr 1, 1996Paper

Evolutionary conservation of RecA genes in relation to protein structure and function

Journal of Bacteriology
S Karlin, L Brocchieri

Abstract

Functional and structural regions inferred from the Escherichia coli R ecA protein crystal structure and mutation studies are evaluated in terms of evolutionary conservation across 63 RecA eubacterial sequences. Two paramount segments invariant in specific amino acids correspond to the ATP-binding A site and the functionally unassigned segment from residues 145 to 149 immediately carboxyl to the ATP hydrolysis B site. Not only are residues 145 to 149 conserved individually, but also all three-dimensional structural neighbors of these residues are invariant, strongly attesting to the functional or structural importance of this segment. The conservation of charged residues at the monomer-monomer interface, emphasizing basic residues on one surface and acidic residues on the other, suggests that RecA monomer polymerization is substantially mediated by electrostatic interactions. Different patterns of conservation also allow determination of regions proposed to interact with DNA, of LexA binding sites, and of filament-filament contact regions. Amino acid conservation is also compared with activities and properties of certain RecA protein mutants. Arginine 243 and its strongly cationic structural environment are proposed as the majo...Continue Reading

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