Extracellular Production of a Serratia marcescens Serine Protease in Escherichia coli
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概要
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The Serratia marcescens serine protease (SSP) is one of the extracellular enzymes secreted from this Gram-negative bacterium. When the ssp gene, which encodes a SSP precursor (preproSSP) composed of a typical NH_2-terminal signal peptide, a mature enzyme domain, and a large COOH-terminal pro-region, is expressed in Escherichia coli, the mature protease is excreted through the outer membrane into the medium. The COOH-terminal pro-region, which is integrated into the outer membrane, provides the essential function for the export of the mature protein across the outer membrane. This is a very simple pathway, in contrast to the general secretory pathway exemplified by the secretion of a pullulanase from Klebsiella oxytoca, in which many separately encoded accessory proteins are required for the transport through the outer membrane. Moreover, the NH_2-terminal region of 71 amino acid residues of the COOH-terminal pro-sequence plays an essential role, as an "intramolecular chaperone," in the folding of the mature enzyme in the medium. In addition to ssp, the S. marcescens strain contains two ssp homologues encoding proteins similar to SSP in amino acid sequence and size, but with no protease activity. Characterization of the homologue proteins and chimeric proteins between the homologues and SSP, all of which are produced in E. coli, has shown that they are membrane proteins that are localized in the outer membrane in the same manner as for SSP. By use of the COOH-terminal domain of SSP, pseudoazurin was exported to the cell surface of E. coli, which proves the usefulness of the SSP secretory system in the export of foreign proteins across the outer membrane.
- 社団法人日本農芸化学会の論文
- 1996-10-23
著者
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Horinouchi Sueharu
Department Of Agricultural Chemistry Faculty Of Agriculture The University Of Tokyo
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Ohnishi Y
Department Of Biotechnology The University Of Tokyo
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Horinouchi Sueharu
Department Of Biotechnology Division Of Agriculture And Life Sciences The University Of Tokyo
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Ohnishi Yasuo
Department Of Biotechnolog Graduate School Of Agriculture And Life Sciences The University Of Tokyo
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