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C-TERMINAL DOMAIN OF THE E. COLI RECA, NMR, MINIMIZED AVERAGE STRUCTUREC-TERMINAL DOMAIN OF THE E. COLI RECA, NMR, MINIMIZED AVERAGE STRUCTURE
Structural highlights
Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedRecA protein and its homologs catalyze homologous pairing of dsDNA and ssDNA, a critical reaction in homologous genetic recombination in various organisms from a virus, microbes to higher eukaryotes. In this reaction, RecA protein forms a nucleoprotein filament on ssDNA, which in turn binds to naked dsDNA for homology search. We suggested that the C-terminal domain of RecA protein plays a role in capturing the dsDNA. Here, we isolated the C-terminal domain as a soluble form and determined the solution structure by NMR spectroscopy. The overall folding of the NMR structure agrees with that of the corresponding part of the reported crystal structure, but a remarkable difference was found in a solvent-exposed region due to intermolecular contacts in the crystal. Then, we studied the interaction between the C-terminal domain and DNA, and found that significant chemical shift changes were induced in a specific region by titration with dsDNA. SsDNA induced a much smaller chemical shift perturbation. The difference of DNA concentrations to give the half-saturation of the chemical shift change showed a higher affinity of the C-terminal region toward dsDNA. Combined with our previous results, these provide direct evidence that the defined region in the C-terminal domain furnishes a binding surface for DNA. An interaction between a specified surface of the C-terminal domain of RecA protein and double-stranded DNA for homologous pairing.,Aihara H, Ito Y, Kurumizaka H, Terada T, Yokoyama S, Shibata T J Mol Biol. 1997 Nov 28;274(2):213-21. PMID:9398528[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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