大腸菌K-12株のdna K7(Ts)変異をサプレスするSuk AおよびSuk B変異の遺伝学的生化学的研究〔英文〕

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タイトル別名
  • Genetic mapping and biochemical characterization of suppressor mutations sukA and sukB for a dnaK7(Ts) mutation of Escherichia coli K-12.
  • ダイチョウキン K-12 カブ ノ dna K7 Ts ヘンイ オ サプレスス

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Temperature-resistant pseudorevertants were isolated from a dnaK7(Ts) mutant of Escherichia coli K-12. Two of these pseudorevertants were shown to carry suppressor mutations, sukA and sukB, respectively. Genetic mapping by conjugation and Pl-transduction revealed that these suppressor mutations were located at two distinct sites between 76 and 77 min close to the suhA and rpoH genes. Labeled cellular proteins were extracted from suppressor mutants grown at various temperatures and subjected to SDS-gel electrophoresis. Autoradiograms of the gels indicated that these suppressor mutations each resulted in increased synthesis of the heat shock protein Lon (an ATP-dependent protease, La) at both permissive and nonpermissive temperatures.<br>

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