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Temperature-resistant pseudorevertants of the temperature-sensitive Escherichia coli mutant KNS19, harboring a mutation in rplX, the gene for ribosomal protein L24, were isolated, cloned, and sequenced. The codon GAC for the amino acid Asp in the temperature-sensitive mutant corresponding to position 84 in the protein chain mutated either back to the wild type (Gly) or to codons for the amino acids Tyr and Glu. Furthermore, rplX genes from two other mutants with an altered protein L24 were cloned and sequenced. The mutations were localized at position 56 (Gly to Asp) and at position 62 (Glu to Lys) in the rplX gene. The latter two mutants lacked a conditional lethal phenotype. The results suggest that the amino acid Gly at positions 56 and 84 in the protein might be involved in loop formations.

Spontaneous missense mutations in the rplX gene for ribosomal protein L24 from Escherichia coli