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J. Biol. Chem., Vol. 276, Issue 49, 45740-45743, December 7, 2001
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From the Department of Biochemistry, University of Wisconsin,
Madison, Wisconsin 53706-1544
RecA protein forms filaments on both single- and
double-stranded DNA. Several studies confirm that filament extension
occurs in the 5' to 3' direction on single-stranded DNA. These
filaments also disassemble in an end-dependent fashion, and
several indirect observations suggest that the disassembly occurs on
the end opposite to that at which assembly occurs. By labeling the 5'
end of single-stranded DNA with a segment of duplex DNA, we demonstrate
unambiguously that RecA filaments disassemble uniquely in the 5' to 3' direction.
RecA Protein Filaments Disassemble in the 5' to 3' Direction on
Single-stranded DNA*
,
*
This work was supported by Grants GM32335 and GM52725 (to
M. M. C.) and GM14711 (to R. B. I.) from the National Institutes of
Health.The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
Present address: Laboratory of Molecular Genetics, NIDCD, National
Institutes of Health, 5 Research Ct., Rockville, MD 20859.
§
To whom correspondence should be addressed: Dept. of
Biochemistry, University of Wisconsin-Madison, 433 Babcock Dr.,
Madison, WI 53706-1544. Tel.: 608-262-1181; Fax: 608-265-2603; E-mail: cox@biochem.wisc.edu.
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