Enzymatic properties of the RecA803 protein, a partial suppressor of recF mutations

Murty V V S Madiraju, Polly E. Lavery, Stephen C. Kowalczykowski, Alvin J. Clark

Research output: Contribution to journalArticle

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Abstract

The RecA803 protein suppresses the recombinational repair defect of recF mutations and displays enhanced joint molecule formation in vitro (Madiraju et al., 1988). To understand the physical basis for these phenomena, the biochemical properties of RecA803 protein were compared with those of the wild-type protein. The RecA803 protein shows greater DNA-dependent ATPase activity than the wild-type protein with either M13 single-stranded (ss) DNA, which contains secondary structure, or double-stranded DNA. This increased activity reflects an enhanced ability of the mutant protein to form active complexes with these DNA molecules rather than an enhanced catalytic turnover activity, because identical kcat values for ATP hydrolysis are obtained when DNA substrates lacking secondary structure are examined. In addition, the ssDNA-dependent ATPase activity of RecA803 protein displays greater resistance to inhibition by SSB (single-stranded DNA binding) protein. These properties of the RecA803 protein are not due to either an increased binding affinity for ssDNA or an increased kinetic lifetime of RecA803 protein-ssDNA complexes, demonstrating that altered protein-DNA stability is not the basis for the enhanced properties of RecA803 protein. However, the nucleation-limited rate of association with ssDNA is more rapid for the RecA803 protein than for wild-type RecA protein. Consequently, we suggest that altered protein-protein interactions may account for the differences between these two proteins. The implications of these results with regard to the partial suppression of recF mutations by recA803 are discussed (Madiraju et al., 1988).

Original languageEnglish (US)
Pages (from-to)10529-10535
Number of pages7
JournalBiochemistry
Volume31
Issue number43
StatePublished - 1992

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Genetic Suppression
Proteins
DNA
Adenosine Triphosphatases
Rec A Recombinases
Physical Phenomena
Mutation
Protein Stability
Single-Stranded DNA
Molecules
DNA-Binding Proteins
Mutant Proteins

ASJC Scopus subject areas

  • Biochemistry

Cite this

Madiraju, M. V. V. S., Lavery, P. E., Kowalczykowski, S. C., & Clark, A. J. (1992). Enzymatic properties of the RecA803 protein, a partial suppressor of recF mutations. Biochemistry, 31(43), 10529-10535.

Enzymatic properties of the RecA803 protein, a partial suppressor of recF mutations. / Madiraju, Murty V V S; Lavery, Polly E.; Kowalczykowski, Stephen C.; Clark, Alvin J.

In: Biochemistry, Vol. 31, No. 43, 1992, p. 10529-10535.

Research output: Contribution to journalArticle

Madiraju, MVVS, Lavery, PE, Kowalczykowski, SC & Clark, AJ 1992, 'Enzymatic properties of the RecA803 protein, a partial suppressor of recF mutations', Biochemistry, vol. 31, no. 43, pp. 10529-10535.
Madiraju MVVS, Lavery PE, Kowalczykowski SC, Clark AJ. Enzymatic properties of the RecA803 protein, a partial suppressor of recF mutations. Biochemistry. 1992;31(43):10529-10535.
Madiraju, Murty V V S ; Lavery, Polly E. ; Kowalczykowski, Stephen C. ; Clark, Alvin J. / Enzymatic properties of the RecA803 protein, a partial suppressor of recF mutations. In: Biochemistry. 1992 ; Vol. 31, No. 43. pp. 10529-10535.
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