Cloning and characterization of a Bacillus subtilis gene homologous to E. coli secY

Journal of Biochemistry
K NakamuraK Yamane

Abstract

A 3.5-kb HindIII DNA fragment containing the secY gene of Bacillus subtilis has been cloned into plasmid pUC13 using the Escherichia coli secY gene as a probe. The complete nucleotide sequence of the cloned DNA indicated that it contained five open reading frames, and their order in the region, given by the gene product, was suggested to be L30-L15-SecY-Adk-Map by their similarity to the products of the E. coli genes. The region was similar to a part of the spc operon of the E. coli chromosome, although the genes for Adk and Map were not included. The gene product of the B. subtilis secY homologue was composed of 423 amino acids and its molecular weight was calculated to be 46,300. The distribution of hydrophobic amino acids in the gene product suggested that the protein is a membrane integrated protein with ten transmembrane segments. The total deduced amino acid sequence of the B. subtilis SecY homologue shows 41.3% homology with that of E. coli SecY, but remarkably higher homologous regions (more than 80% identity) are present in the four cytoplasmic domains.

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