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. 1989 Apr 25;17(8):3145–3161. doi: 10.1093/nar/17.8.3145

The histone-like H protein of Escherichia coli is ribosomal protein S3.

R C Bruckner 1, M M Cox 1
PMCID: PMC317720  PMID: 2657655

Abstract

We report the purification of four proteins from Escherichia coli that stimulate or inhibit inter- and/or intramolecular recombination promoted by the yeast plasmid-encoded FLP protein. The proteins are identified as the ribosomal proteins S3 (27 kDa), L2 (26 kDa), S4 (24 kDa), and S5 (16 kDa), on the basis of N-terminal sequence analysis. The S3 protein is found to be identical to H protein, an E. coli histone-like protein that is related to histone H2A immunologically and by virtue of amino acid content. The H protein/S3 identity is based on co-migration on polyacrylamide gels, heat stability, amino acid analysis, and effects on FLP-promoted recombination. These results are relevant to current studies on the structure of the E. coli nucleoid. Since the H protein has previously been found associated with the E. coli nucleoid, the results indicate that either (a) some ribosomal proteins serve a dual function in E. coli, or, more likely, (b) ribosomal proteins can and are being mis-identified as nucleoid constituents.

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