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. 1981 Jan;145(1):513–520. doi: 10.1128/jb.145.1.513-520.1981

Identity of the B56.5 protein, the A-protein, and the groE gene product of Escherichia coli.

F C Neidhardt, T A Phillips, R A VanBogelen, M W Smith, Y Georgalis, A R Subramanian
PMCID: PMC217301  PMID: 6161915

Abstract

Protein B56.5 is a major Escherichia coli protein, originally identified on two-dimensional gels as an abundant cellular protein with unique regulation. The groE gene product is a bacterial protein essential for the assembly of many diverse bacteriophages. The ribosomal A-protein is a large, acidic protein of unknown function associated with isolated, washed ribosomes. On the basis of comigration in two-dimensional gels, oligopeptide map patterns, amino acid composition, immunological specificity, physical properties, and genetic analysis, protein B56.5 has now been shown to be the groE gene product and to be identical with the A-protein.

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