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. 1990 Sep;172(9):5052–5063. doi: 10.1128/jb.172.9.5052-5063.1990

Secretory S complex of Bacillus subtilis: sequence analysis and identity to pyruvate dehydrogenase.

H Hemilä 1, A Palva 1, L Paulin 1, S Arvidson 1, I Palva 1
PMCID: PMC213162  PMID: 1697575

Abstract

We have cloned the operon coding for the Bacillus subtilis S complex, which has been proposed to be a component in protein secretion machinery. A lambda gt10 library of B. subtilis was screened with antiserum directed against the Staphylococcus aureus membrane-bound ribosome protein complex, which is homologous to the B. subtilis S complex. Two positive overlapping lambda clones were sequenced. The S-complex operon, 5 kilobases in size, was shown to contain four open reading frames and three putative promoters, which are located upstream of the first, the third, and the last gene. The four proteins encoded by the operon are 42, 36, 48, and 50 kilodaltons in size. All of these proteins were recognized by antisera separately raised against each protein of the S. aureus membrane-bound ribosome protein and B. subtilis S complexes, thus verifying the S-complex identity of the lambda clones. Sequence analysis revealed that all four proteins of the B. subtilis S complex are homologous to the four subunits of the human pyruvate dehydrogenase (PDH). Also, the N terminus of the 48-kilodalton protein was found to have 70% amino acid identity with the N-terminal 211 amino acids, determined so far, from the E2 subunit of B. stearothermophilus PDH. Furthermore, chromosomal mapping of the S-complex operon gave a linkage to a marker gene located close to the previously mapped B. subtilis PDH genes. Thus, the S complex is evidently identical to the B. subtilis PDH, which has been shown to contain four subunits with molecular weights very similar to those of the S complex. Therefore, we propose that the S complex is not a primary component of protein secretion.

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Selected References

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