Murine leukemia virus maturation: protease region required for conversion from "immature" to "mature" core form and for virus infectivity.

Abstract:

:Murine leukemia virus (MuLV) genome encodes a protease (Y. Yoshinaka, I. Katoh, T.D. Copeland, and S. Oroszlan (1985), Proc. Natl. Acad. Sci. USA 82, 1618-1622), which has been shown to cause maturation, specified as morphological conversion from "immature" to "mature" form of virus cores. To examine whether "immature" particles have infectivity or not, we constructed mutant DNAs with deletions in the protease region. The NIH/3T3 cells transfected with mutant DNAs produced "immature" particles, having immature morphology and containing Pr65gag, a polyprotein precursor of core proteins. The specific infectivity of the extracellularly released and purified particles was shown to be greatly reduced based on reverse transcriptase activity and protein content as compared with the "mature" particles obtained from wild-type DNA-transfected cells. The mutant genomes encoded functionally normal surface glycoprotein, gp70. These results strongly suggest that maturation of MuLV from "immature" to "mature" form of virus particles is indispensable to virus infectivity. The importance of processing of gag and pol, as well as transmembrane protein precursors by the viral protease is discussed.

journal_name

Virology

journal_title

Virology

authors

Katoh I,Yoshinaka Y,Rein A,Shibuya M,Odaka T,Oroszlan S

doi

10.1016/0042-6822(85)90161-8

subject

Has Abstract

pub_date

1985-09-01 00:00:00

pages

280-92

issue

2

eissn

0042-6822

issn

1096-0341

journal_volume

145

pub_type

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