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J. Bacteriol., 11 1995, 6381-6389, Vol 177, No. 22
Copyright © 1995, American Society for Microbiology

The three genes lipB, lipC, and lipD involved in the extracellular secretion of the Serratia marcescens lipase which lacks an N-terminal signal peptide

H Akatsuka, E Kawai, K Omori and T Shibatani
Lead Generation Research Laboratory, Tanabe Seiyaku Co., Ltd., Osaka, Japan.

The extracellular lipase of Serratia marcescens Sr41, lacking a typical N-terminal signal sequence, is secreted via a signal peptide- independent pathway. The 20-kb SacI DNA fragment which allowed the extracellular lipase secretion was cloned from S. marcescens by selection of a phenotype conferring the extracellular lipase activity on the Escherichia coli cells. The subcloned 6.5-kb EcoRV fragment was revealed to contain three open reading frames which are composed of 588, 443, and 437 amino acid residues constituting an operon (lipBCD). Comparisons of the deduced amino acid sequences of the lipB, lipC, and lipD genes with those of the Erwinia chrysanthemi prtDEC, prtEEC, and prtFEC genes encoding the secretion apparatus of the E. chrysanthemi protease showed 55, 46, and 42% identity, respectively. The products of the lipB and lipC genes were 54 and 45% identical to the S. marcescens hasD and hasE gene products, respectively, which were secretory components for the S. marcescens heme-binding protein and metalloprotease. In the E. coli DH5 cells, all three lipBCD genes were essential for the extracellular secretion of both S. marcescens lipase and metalloprotease proteins, both of which lack an N-terminal signal sequence and are secreted via a signal-independent pathway. Although the function of the lipD gene seemed to be analogous to those of the prtFEC and tolC genes encoding third secretory components of ABC transporters, the E. coli TolC protein, which was functional for the S. marcescens Has system, could not replace LipD in the LipB-LipC-LipD transporter reconstituted in E. coli.(ABSTRACT TRUNCATED AT 250 WORDS)


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