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(Received for publication, June 18, 1996, and in revised form, October 7, 1996)
From the According to the crystal structure, the RecA
protein has a domain near the C terminus consisting of amino acid
residues 270-328 (from the N terminus). Our model building pointed out
the possibility that this domain is a part of "gateway" through
which double-stranded DNA finds a path for direct contact with
single-stranded DNA within a presynaptic RecA filament in the search
for homology. To test this possible function of the domain, we made
mutant RecA proteins by site-directed single (or double, in one case)
replacement of 2 conserved basic amino acid residues and 5 among 9 nonconserved basic amino acid residues in the domain. Replacement
of either of the 2 conserved amino acid residues caused
deficiencies in repair of UV-damaged DNA, an in vivo
function of RecA protein, whereas the replacement of most (except one)
of the tested nonconserved ones gave little or no effect.
Purified mutant RecA proteins showed no (or only slight)
deficiencies in the formation of presynaptic filaments as assessed by
various assays. However, presynaptic filaments of both proteins that
had replacement of a conserved amino acid residue had significant
defects in binding to and pairing with duplex DNA (secondary binding).
These results are consistent with our model that the conserved amino
acid residues in the C-terminal domain have a direct role in
double-stranded DNA binding and that they constitute a part of a
gateway for homologous recognition.
Volume 271, Number 52,
Issue of December 27, 1996
pp. 33515-33524
©1996 by The American Society for Biochemistry and Molecular Biology, Inc.
A GATEWAY MODEL FOR DOUBLE-STRANDED DNA BINDING
§
,
,
,
,
,
,
§
Laboratory of Cellular and Molecular
Biology, The Institute of Physical and Chemical Research (RIKEN),
Wako-shi, Saitama 351-01, Japan, § Graduate School of
Science and Engineering, Saitama University, Urawa-shi,
Saitama 338, Japan,
Department of Biophysics and Biochemistry,
Graduate School of Science, The University of Tokyo,
Tokyo 113, Japan, ** Department of Genetics and Molecular Biophysics
and Biochemistry, Yale University School of Medicine,
New Haven, Connecticut 06510, and 
Gene
Bank, Tsukuba Life Science Center, The Institute of Physical and
Chemical Research (Rikagaku Kenky
-jo), 3-1-1 Koyadai,
Tsukuba 305, Japan
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