Histidine 265 is important for covalent catalysis by vaccinia topoisomerase and is conserved in all eukaryotic type I enzymes.

Abstract

Vaccinia topoisomerase catalyzes DNA cleavage and rejoining via transesterification to pentapyrimidine recognition site 5'-(C/T)CCTT downward arrow in duplex DNA. The proposed reaction mechanism involves general-base catalysis of the attack by active site nucleophile Tyr-274 on the scissile phosphodiester and general-acid catalysis of the expulsion of the 5… (More)

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