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Summary The gene product of F tral is a bifunctional protein which nicks and unwinds the F plasmid during conjugal DNA transfer. Further biochemical characterization of the Tral protein reveals that it has a second, much lower, Km for ATP hydrolysis, in addition to that previously identified. Measurement of the single‐stranded DNA‐stimulated ATPase rate indicates that there is co‐operative interaction between the enzyme monomers for maximal activity. Furthermore, 18O‐exchange experiments indicate that Tral protein hydrolyses ATP with, at most, a low‐level reversal of the hydrolytic step during each turnover.
Molecular Microbiology – Wiley
Published: May 1, 1992
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