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• W1614386985 endingPage "7187" @default.
• W1614386985 startingPage "7180" @default.
• W1614386985 abstract "Human rhinoviruses, like other picornaviruses, encode a cysteine protease (designated 3C) which cleaves mainly at viral Gln-Gly pairs. There are significant areas of homology between picornavirus 3C cysteine proteases and cellular serine proteases (e.g. trypsin), suggesting a functional relationship between their catalytic regions. To test this functional relationship, we made single substitutions in human rhinovirus type 14 protease 3C at seven amino acid positions which are highly conserved in the 3C proteases of animal picornaviruses. Substitutions at either His-40, Asp-85, or Cys-146, equivalent to the trypsin catalytic triad His-57, Asp-102, and Ser-195, respectively, completely abolished 3C proteolytic activity. Single substitutions were also made at either Thr-141, Gly-158, His-160, or Gly-162, which are equivalent to the trypsin specificity pocket region. Only the mutant with a conservative Thr-141 to Ser substitution exhibited proteolytic activity, which was much reduced compared with the parent. These results, together with immunoprecipitation data which indicate that Asp-85, Thr-141, and Cys-146 lie in accessible surface regions, suggest that the catalytic mechanism of picornavirus 3C cysteine proteases is closely related to that of cellular trypsin-like serine proteases." @default.
• W1614386985 created "2016-06-24" @default.
• W1614386985 creator A5029419870 @default.
• W1614386985 creator A5041037444 @default.
• W1614386985 creator A5045145914 @default.
• W1614386985 date "1990-05-01" @default.
• W1614386985 modified "2023-10-11" @default.
• W1614386985 title "Site-directed mutagenesis suggests close functional relationship between a human rhinovirus 3C cysteine protease and cellular trypsin-like serine proteases." @default.
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• W1614386985 doi "https://doi.org/10.1016/s0021-9258(19)39096-9" @default.
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