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Protein Interactions in the Assembly of the Tail of Bacteriophage T4

Overview
Journal Biophys Rev
Publisher Springer
Specialty Biophysics
Date 2017 May 17
PMID 28510165
Citations 2
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Abstract

Protein interactions in the assembly of the baseplate have been investigated. The baseplate of the phage T4 tail consists of a hub and six wedges which surround the former. Both reversible and irreversible interactions were found. Reversible association includes gp5 and gp27 (gp: gene product) which form a complex in a pH-dependent manner and gp18 polymerization, i.e. the tail sheath formation depends on the ionic strength. These reversible interactions were followed by irreversible or tight binding which pulls the whole association reaction to complete the assembly. The wedge assembly is strictly ordered which means that if one of the seven wedge proteins is missing, the assembly proceeds to that point and the remaining molecules stay non-associated. The strictly sequential assembly pathway is suggested to be materialized by successive conformational change upon binding, which can be shown by proteolytic probe.

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