Separate and Combined Biochemical Activities of the Subunits of a Naturally Split Reverse Gyrase

Overview

Journal J Biol Chem

Specialty Biochemistry

Date 2010 Oct 9

PMID 20929866

Citations 13

Authors

Christopher Capp

Yushen Qian

Harvey Sage

Harald Huber

Tao-Shih Hsieh

Affiliations

Soon will be listed here.

Abstract

Reverse gyrase reanneals denatured DNA and induces positive supercoils in DNA, an activity that is critical for life at very high temperatures. Positive supercoiling occurs by a poorly understood mechanism involving the coordination of a topoisomerase domain and a helicase-like domain. In the parasitic archaeon Nanoarchaeum equitans, these domains occur as separate subunits. We express the subunits, and characterize them both in isolation and as a heterodimer. Each subunit tightly associates and interacts with the other. The topoisomerase subunit enhances the catalytic specificity of the DNA-dependent ATPase activity of the helicase-like subunit, and the helicase-like subunit inhibits the relaxation activity of the topoisomerase subunit while promoting positive supercoiling. DNA binding preference for both single- and double-stranded DNA is partitioned between the subunits. Based on a sensitive topological shift assay, the binding preference of helicase-like subunit for underwound DNA is modulated by its binding with ATP cofactor. These results provide new insight into the mechanism of positive supercoil induction by reverse gyrase.

Citing Articles

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