1887

Abstract

The growth and protein export defects (Ts) strains can be suppressed by the CsaA protein of . The present studies indicate that this effect can be attributed to chaperone-like activities of CsaA. First, CsaA stimulated protein export in , and mutant strains of . Second, CsaA suppressed the growth defects of , and mutants of . Third, and most importantly, CsaA exhibited chaperone-like properties by stimulating the reactivation of heat-denatured firefly luciferase in , , and mutant strains of , and by preventing the aggregation of heat-denatured luciferase . Thus, it seems that CsaA suppresses the growth and secretion defects of (Ts) strains either by improving the translocation competence of exported pre-proteins, thereby making them better substrates for mutant SecA proteins, or by stimulating the translocation activity of mutant SecA proteins.

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2000-01-01
2022-01-28
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