1887

Abstract

SUMMARY

Herpes simplex virus type 1 (HSV-1) encodes a polypeptide of apparent mol. wt. 136000 (V136) known to be a component of the virus-specified ribonucleotide reductase. Monoclonal antibodies that precipitate this polypeptide also precipitate a polypeptide of mol. wt. 38000 (V38) from extracts of HSV-1-infected cells. The basis for this co-precipitation has been investigated using a monoclonal antibody directed against V136 and an oligopeptide-induced antiserum directed against the carboxy terminus of V38. We have also made use of a temperature-sensitive () mutant of HSV-1 which maps within the sequences encoding V136 and which induces a thermolabile ribonucleotide reductase. Our experiments show (i) V136 and V38 form a complex in infected cells and (ii) the mutation in the mutant results in the two polypeptides being unable to form the complex at the non-permissive temperature. We speculate that association of the two polypeptides is necessary for ribonucleotide reductase activity. No evidence was found for involvement of host proteins in the proposed virus-induced ribonucleotide reductase complex. The terms RR and RR are suggested for the large and small subunits of the HSV-induced enzyme.

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1985-07-01
2021-10-27
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