Abstract
The crystal structure of the recA protein from Escherichia coli at 2.3-Å resolution reveals a major domain that binds ADP and probably single- and double-stranded DNA. Two smaller subdomains at the N and C termini protrude from the protein and respectively stabilize a 61 helical polymer of protein subunits and interpolymer bundles. This polymer structure closely resembles that of recA/DNA filaments determined by electron microscopy. Mutations in recA protein that enhance coprotease, DNA-binding and/or strand-exchange activity can be explained if the interpolymer interactions in the crystal reflect a regulatory mechanism in vivo.
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Story, R., Weber, I. & Steitz, T. The structure of the E. coli recA protein monomer and polymer. Nature 355, 318–325 (1992). https://doi.org/10.1038/355318a0
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DOI: https://doi.org/10.1038/355318a0
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