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Papers In Press, published online ahead of print October 6, 2003
Department of Biochemistry, University of Wisconsin-Madison, Madison, WI 53706-1544
Corresponding Author: cox{at}biochem.wisc.edu
The RecA proteins of Escherichia coli (Ec) and Deinococcus radiodurans (Dr) both promote a DNA strand exchange reaction involving two duplex DNAs. The four-strand exchange reaction promoted by the DrRecA protein is similar to that promoted by EcRecA, except that key parts of the reaction are inhibited by EcSSB. In the absence of SSB, the initiation of strand exchange is greatly enhanced by dsDNA-ssDNA junctions at the ends of DNA gaps. This same trend is seen with the EcRecA protein. The results lead to an expansion of published hypotheses for the pathway for RecA-mediated DNA pairing, in which the slow first order step (observed in several studies) involves a structural transition to a state we designate P. The P state is identical to the state found when RecA is bound to dsDNA. The structural state present when the RecA protein is bound to ssDNA is designated A. The DNA pairing model in turn facilitates an articulation of three additional conclusions arising from the present work: (1) When a segment of a RecA filament bound to ssDNA is forced into the P state (as RecA bound to the ssDNA immediately adjacent to dsDNA-ssDNA junction), the segment becomes "pairing-enhanced". (2) The unusual DNA pairing properties of the D. radiodurans RecA protein can be explained by postulating this protein has a more stringent requirement to initiate DNA strand exchange from the P state. (3) RecA filaments bound to dsDNA (P state) have directly observable structural changes relative to RecA filaments bound to ssDNA (A state), involving the C-terminal domain.
J. Biol. Chem, 10.1074/jbc.M308563200
Submitted on August 4, 2003
Revised on October 3, 2003
Accepted on October 6, 2003
A DNA pairing-enhanced conformation of bacterial RecA proteins
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