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Volume 146, Issue 10

The carboxyl terminus of the SecA is dispensable for protein secretion and viability Free

Abstract

The secretion-dedicated chaperone SecB targets a subset of proteins to the translocase by interacting with the carboxyl (C-) terminus of SecA. This region of SecA is highly conserved in Eubacteria, but despite its presence in the SecA, the genome does not appear to contain a gene for a clear homologue of SecB. Deletion of the C-terminus of the SecA yields cells that have normal viability, but that exhibit a response reminiscent of oxidative stress and the loss of a number of secretory proteins from the culture supernatant. Semi-quantitative RT-PCR demonstrates that these proteins are expressed at lower levels. The C-terminus of SecA fused to glutathione -transferase (GST) specifically binds a cytosolic protein, termed MrgA. This protein has been reported to function in relation to oxidative stress, but deletion of the gene does not result in a secretion defect nor does it cause an oxidative stress response. It is concluded that the C-terminus of the SecA is not essential for secretion and viability.

  • Received:
  • Accepted:
  • Revised:
  • Published Online:
Keyword(s): Cam, chloramphenicol , chaperones , GST, Schistosoma japonicum glutathione S-transferase , GST-C, GST fusion bearing the C-terminal 22 amino acids of B. subtilis SecA , Phle, phleomycin , protein secretion , SecA , SecB and SRP, signal recognition particle
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2000-10-01
2024-04-26
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The carboxyl terminus of the Bacillus subtilis SecA is dispensable for protein secretion and viability
Microbiology 146, 2573 (2000); https://doi.org/10.1099/00221287-146-10-2573
/content/journal/micro/10.1099/00221287-146-10-2573
/content/journal/micro/10.1099/00221287-146-10-2573
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