title: Enhanced extracellular production of heterologous proteins in Bacillus subtilis by deleting the C-terminal region of the SecA secretory machinery.
abstract: In this study, we examined the effects of modifying the C-terminal region of the SecA protein on the production of heterologous proteins in Bacillus subtilis. SecA was selected as a candidate among the components of the Sec system due to its ability to interact directly with both the precursors and membrane translocases. A phylogenetic comparison demonstrated that the C-terminal region is not well conserved among eubacterial SecA proteins. The deletion of the 61 amino acids at the C-terminal region led to an 83% increase in extracellular alkaliphilic Bacillus sp. thermostable alkaline cellulase (Egl-237) activity. Moreover, the productivity of human interferon α (hIFN-α2b) was increased by 2.2-fold compared to the wild-type SecA, by deletion of these 61 amino acids. We indicated that the deletion of the C-terminal domain (CTD) of SecA enhanced the secretion of two different heterologous protein, Egl-237 and hIFN-α2b. This study provides a useful method to enhance the extracellular production of heterologous proteins in B. subtilis.
authors.affiliation: Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki, 305-8572, Japan. kakeshita.hiroshi@kao.co.jp
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kakeshita
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kakeshtia
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Kageyama
authors.forename: Katsutoshi
authors.initials: K
authors.lastname: Ara
authors.forename: Katsuya
authors.initials: K
authors.lastname: Ozaki
authors.forename: Kouji
authors.initials: K
authors.lastname: Nakamura
mesh_terms: D000251:Adenosine Triphosphatases / Q000737:chemistry / Q000235:genetics*; D000595:Amino Acid Sequence; D001412:Bacillus subtilis / Q000235:genetics / Q000378:metabolism*; D001426:Bacterial Proteins / Q000096:biosynthesis* / Q000737:chemistry / Q000235:genetics; D015153:Blotting, Western; D004591:Electrophoresis, Polyacrylamide Gel; D006801:Humans; D016898:Interferon-alpha / Q000096:biosynthesis / Q000235:genetics; D026901:Membrane Transport Proteins / Q000737:chemistry / Q000235:genetics*; D008969:Molecular Sequence Data; D000069816:SEC Translocation Channels; D000081416:SecA Proteins; D017386:Sequence Homology, Amino Acid
chemical_list: D001426:Bacterial Proteins; D016898:Interferon-alpha; D026901:Membrane Transport Proteins; D000069816:SEC Translocation Channels; D000251:Adenosine Triphosphatases; D000081416:SecA Proteins