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Microbiology and Molecular Biology Reviews, March 1999, p. 149-160, Vol. 63, No. 1
1092-2172/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Precise Packaging of the Three Genomic Segments of the Double-Stranded-RNA Bacteriophage phi 6

Leonard Mindich*

Department of Microbiology, The Public Health Research Institute New York, New York 10016

Bacteriophage phi 6 has a genome of three segments of double-stranded RNA. Each virus particle contains one each of the three segments. Packaging is effected by the acquisition, in a serially dependent manner, of the plus strands of the genomic segments into empty procapsids. The empty procapsids are compressed in shape and expand during packaging. The packaging program involves discrete steps that are determined by the amount of RNA inside the procapsid. The steps involve the exposure and concealment of binding sites on the outer surface of the procapsid for the plus strands of the three genomic segments. The plus strand of segment S can be packaged alone, while packaging of the plus strand of segment M depends upon prior packaging of S. Packaging of the plus strand of L depends upon the prior packaging of M. Minus-strand synthesis begins when the particle has a full complement of plus strands. Plus-strand synthesis commences upon the completion of minus-strand synthesis. All of the reactions of packaging, minus-strand synthesis, and plus-strand synthesis can be accomplished in vitro with isolated procapsids. Live-virus constructions that are in accord with the model have been prepared. Mutant virus with changes in the packaging program have been isolated and analyzed.

* Mailing address: Public Health Research Institute, 455 First Ave., New York, NY 10016. Phone: (212) 578-0845. Fax: (212) 578-0804. E-mail: mindich{at}phri.nyu.edu.

Microbiology and Molecular Biology Reviews, March 1999, p. 149-160, Vol. 63, No. 1
1092-2172/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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