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J Virol. 1982 September; 43(3): 809-818
Copyright © 1982, American Society for Microbiology. All Rights Reserved.

Mapping the Mutation Site of an Autographa californica Nuclear Polyhedrosis Virus Polyhedron Morphology Mutant

Department of Microbiology and Immunology, Queen's University, Kingston, Ontario K7L 3N6, Canada

ABSTRACT

A polyhedron morphology mutant of Autographa californica nuclear polyhedrosis virus, designated M5, was compared with wild-type virus by genotypic analysis with EcoRI, BamHI, HindIII, SstI, and SmaI restriction endonucleases. M5 DNA revealed several alterations relative to the wild-type pattern: (i) EcoRI fragment I was 400 base pairs larger; (ii) BamHI fragment F was missing; (iii) HindIII fragment F was 400 base pairs larger; (iv) an extra restriction fragment was obtained with both HindIII and SmaI; and (v) SstI fragment G was 400 base pairs larger. M5 virions contained two size classes of circular DNA, one of 100% of the wild type and one of about 58% of the wild-type molecule. A revertant of M5, designated M5R, was isolated on the basis of polyhedron morphology. The genome of M5R contained the insertion of DNA in EcoRI fragment I and in HindIII fragment F, but was similar to the wild type in its other restriction fragment patterns. M5-infected cell cultures synthesized a polyhedrin polypeptide smaller in size than the wild type or M5R.

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