Chemical Modification of the Coat Protein in Bacteriophage Fd and Orientation of the Virion During Assembly and Disassembly

Overview

Journal EMBO J

Specialties Biotechnology
Molecular Biology

Date 1983 Jan 1

PMID 6357778

Citations 10

Authors

J Armstrong

J A Hewitt

R N Perham

Affiliations

Soon will be listed here.

Abstract

The major (gene VIII) coat protein of bacteriophage fd was radiolabelled by treating the virus with methyl[3H]acetimidate without causing any loss of infectivity. Complete amidination of lysine-8 in the amino acid sequence of the protein was achieved but little or no modification of the lysine residues near the C terminus was observed. This supports the assumption that the coat protein is oriented in the viral filament with its N terminus on the outside and its C-terminal region abutting the DNA. Escherichia coli was co-infected with radiolabelled bacteriophage and with unlabelled miniphage, a shorter defective form of phage fd. Radiolabel was detected in the progeny miniphage, proving that individual coat protein subunits can be recycled and assembled onto progeny miniphage DNA. About 35% of the coat protein subunits of phage particles infecting E. coli were recycled in 1 h. These facts support a model of the assembly and disassembly of the virion at the bacterial membrane in which the end of the particle containing the minor adsorption (gene III) protein, which is presumably the first to disassemble during infection, is the last to assemble during morphogenesis.

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