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- W2111666184 abstract "The cytomegalovirus (CMV) serine proteinase assemblin is synthesized as a precursor that undergoes three principal autoproteolytic cleavages. Two of these are common to the assemblin homologs of all herpes group viruses: one at the maturational site near the carboxyl end of the precursor and another at the release site near the midpoint of the precursor. Release-site cleavage frees the proteolytic amino domain, assemblin, from the nonproteolytic carboxyl domain of the precursor. In CMV, a third autoproteolytic cleavage at an internal site divides assemblin into an amino subunit (An) and a carboxyl subunit (Ac) of approximately the same size that remain associated as an active two-chain enzyme. We have cloned the sequences encoding An and Ac as separate genes and expressed them by transfecting human cells with recombinant plasmids and by infecting insect cells with recombinant baculoviruses. When An and Ac from either simian CMV or human CMV were coexpressed in human or insect cells, active two-chain assemblin was formed. This finding demonstrates that An and Ac do not require synthesis as single-chain assemblin to fold and associate correctly in these eukaryotic systems, and it suggests that they may be structurally, if not functionally, distinct domains. An interaction between the independently expressed An and Ac subunits was demonstrated by coimmunoprecipitation experiments, and efforts to disrupt the complex indicate that the subunit interaction is hydrophobic. Cell-based cleavage assays of the two-chain assemblin formed from independently expressed An and Ac also indicate that (i) its specificity for both CMV and herpes simplex virus native substrates is similar to that of single-chain assemblin, (ii) R-site cleavage is not essential for the activity of two-chain recombinant assemblin, and (iii) the human CMV and simian CMV An and Ac recombinant subunits are functionally interchangeable." @default.
- W2111666184 created "2016-06-24" @default.
- W2111666184 creator A5021090743 @default.
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- W2111666184 date "1996-08-01" @default.
- W2111666184 modified "2023-09-24" @default.
- W2111666184 title "Cytomegalovirus assemblin: the amino and carboxyl domains of the proteinase form active enzyme when separately cloned and coexpressed in eukaryotic cells" @default.
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- W2111666184 doi "https://doi.org/10.1128/jvi.70.8.5395-5404.1996" @default.
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