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A temperature-sensitive mutant ofEscherichia coli with an alteration in ribosomal protein L22

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Abstract

A temperature-sensitive, protein synthesis-defective mutant ofEscherichia coli exhibiting an altered ribosomal protein L22 has been investigated. The temperature-sensitive mutation was mapped to therplV gene for protein L22. The genes from the wild type and mutant strains were amplified by the polymerase chain reaction and the products were sequenced. A cytosine to thymine transition at position 22 of the coding sequence was found in the mutant DNA, predicting an arginine to cysteine alteration in the protein. A single cysteine residue was found in the isolated mutant protein. This amino acid change accounts for the altered mobility of the mutant protein in two-dimensional gels and during reversed-phase HPLC. The temperature-sensitive phenotype was fully complemented by a plasmid carrying the wild type L22 gene. Ribosomes from the complemented cells showed only wild type protein L22 by two dimensional gel analysis and were as heat-resistant as control ribosomes in a translation assay. The point mutation in the L22 gene is uniquely responsible for the temperature-sensitivity of this strain.

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Burnette-Vick, B., Champney, W.S. & Musich, P.R. A temperature-sensitive mutant ofEscherichia coli with an alteration in ribosomal protein L22. Genetica 94, 17–25 (1994). https://doi.org/10.1007/BF01429216

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