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SecY is a central component of the export machinery that mediates the translocation of secretory proteins across the plasma membrane of Escherichia coli. We have cloned and sequenced the secY genes from Bacillus licheniformis and Staphylococcus carnosus. The deduced amino acid sequences are highly homologous to those of other known SecY polypeptides, all having the potential to form 10 transmembrane segments. Comparative analysis of 9 SecY polypeptides, derived from different bacteria, revealed that 14 amino acid positions (2.7%) are identical in all SecY proteins and 89 (16.9%) show conservative changes. Clusters of conserved amino acid residues were found in 4 of the 10 transmembrane segments and 2 of the 6 cytoplasmic domains. It is suggested that the conserved regions might be involved in the translocation activity of SecY or might be required for the correct interaction of SecY with other components of the secretion apparatus.

mgg molecular and general genetics

Cloning and molecular characterization of the secY genes from Bacillus licheniformis and Staphylococcus carnosus: comparative analysis of nine members of the SecY family