DNA gyrase subunit stoichiometry and the covalent attachment of subunit A to DNA during DNA cleavage

作者：Akio Sugino, N. Patrick Higgins, Nicholas R. Cozzarelli · 发表于：Nucleic Acids Research · 年份：1980 · DOI：10.1093/nar/8.17.3865 · 被引用次数：89 · 研究领域：Cancer therapeutics and mechanisms、Bioactive Compounds and Antitumor Agents、DNA Repair Mechanisms

Escherichia coli DNA gyrase contains a 1:1 ratio of protomers coded by the genes gyrA and gyrB. This along with previous results shows that the enzyme has two copies of each protomer and thus a molecular weight of 400,000. Abortion of the gyrase reaction results in double-strand breakage of the DNA and covalent attachment of both gyrA protomers to the 5'-cut ends. We conclude that the gyrA protomer contains a critical part of the active site for the concerted breakage and reunion reaction of gyrase, the topoisomerase activity of the enzyme.