Characterization of Cricket Paralysis Virus-induced Polypeptides in Drosophila Cells

Overview

Journal J Virol

Publisher American Society for Microbiology

Date 1980 Jan 1

PMID 16789183

Citations 31

Authors

N F Moore

A Kearns

J S Pullin

Affiliations

Soon will be listed here.

Abstract

Cricket paralysis virus purified from Galleria mellonella larvae was shown to be similar to virus purified from Drosophila melanogaster cells. Cricket paralysis virus contained three major structural polypeptides of similar molecular weight (around 30,000), had a buoyant density of 1.344 g/ml, and had a capsid diameter of 27 nm. Twenty virus-induced polypeptides could be detected in CrPV-infected Drosophila cells. Two major polypeptides found in the infected cells corresponded to two structural viral polypeptides (VP1 and VP3), whereas the third major intracellular polypeptide was the apparent precursor of the third viral structural polypeptide (VP2). Three of the primary virus-induced polypeptides had molecular weights of 144,000, 124,000, and 115,000. These and other polypeptides were chased into lower-molecular-weight proteins when excess cold methionine was added after a short [(35)S]methionine pulse. Although cricket paralysis virus has a number of characteristics in common with the mammalian enteroviruses, the extremely fast processing of high-molecular-weight polypeptides into viral proteins seems atypical. Also, no VP4 (8,000 to 10,000 molecular weight) has been found in the virus particles.

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