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J. Biol. Chem., Vol. 259, Issue 2, 805-814, 01, 1984
JW Chase, JJ L'Italien, JB Murphy, EK Spicer and KR Williams
The ssb-113 (formerly lexC113) gene encoding a mutant single-stranded DNA
binding protein (SSB) has been cloned into plasmid pSC101 resulting in 5-
to 10-fold more mutant protein than strains carrying only one (chromosomal)
copy of the gene. Analysis of tryptic and chymotryptic peptides of the
mutant protein by high pressure liquid chromatography and solid phase
protein sequencing has shown that the ssb-113 mutation results in the
substitution of serine for proline at residue 176 of SSB. This change could
only occur in one step by a C leads to T transition in the DNA sequence.
Physicochemical studies of the homogeneous mutant protein have shown that
it binds as well as wild type SSB to single-stranded DNA and that it is a
slightly better helix- destabilizing protein than wild type SSB as measured
by its ability to lower the thermal melting transition of poly[d(A-T)]. In
vivo studies of ssb-113 strains carrying the cloned ssb-113 gene in pSC101
have shown that overproduction of the mutant protein does not complement
the temperature-sensitive conditional lethality caused by the ssb-113
mutation when present in single gene copy in contrast to effects recently
observed in ssb-1 strains overproducing the ssb-1 encoded protein (Chase,
J. W., Murphy, J. B., Whittier, R. F., Lorensen, E., and Sninsky, J. J.
(1983) J. Mol. Biol. 164, 193-211). Also noted in this report are two
corrections to the DNA sequence of wild type SSB, one of which places
glycine (codon GGC) at residue 133 rather than serine as previously
reported (Sancar, A., Williams, K. R., Chase, J. W., and Rupp, W. D. (1981)
Proc. Natl. Acad. Sci. U.S.A. 78, 4274- 4278). The second correction to the
DNA sequence is in the serine 39 codon, previously reported to be TCA and
now correctly shown to be TCC.
Characterization of the Escherichia coli SSB-113 mutant single-stranded DNA-binding protein. Cloning of the gene, DNA and protein sequence analysis, high pressure liquid chromatography peptide mapping, and DNA- binding studies
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