Activity of two-chain recombinant human cytomegalovirus protease

Autor: M V Toth, Arthur J. Wittwer, R.C. Wiegand, Christine E. Smith, L S Carr, K L Duffin, M L Bryant, Barry C. Holwerda
Rok vydání: 1994
Předmět:
Zdroj: Journal of Biological Chemistry. 269:25911-25915
ISSN: 0021-9258
DOI: 10.1016/s0021-9258(18)47332-2
Popis: The human cytomegalovirus UL80 protease was expressed in Escherichia coli and purified by metal-chelate chromatography using a histidine tag engineered at the amino terminus. Cleavage of the 30-kDa protease at an internal site, VEA/A144, resulted in the recovery of 16- plus 14-kDa two-chain protease. The amino-terminal 16-kDa chain and the carboxyl-terminal 14-kDa chain remained associated as an active enzyme that was modified specifically at Ser132 on the 16-kDa chain by [3H]diisopropyl fluorophosphate. Disruption of the cleavage site by mutation from VEA/A to AEA/A facilitated the recovery of active 30-kDa one-chain enzyme that could be similarly modified at Ser132 by [3H]diisopropyl fluorophosphate. Both one- and two-chain enzymes cleaved recombinant assembly protein at the maturation site, VNA/S, and a peptide, GVVNASARL, mimicking this site. Internal processing does not inactivate the protease but forms a two-chain enzyme that retains activity.
Databáze: OpenAIRE