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PEDS Advance Access published online on May 19, 2006
Protein Engineering Design and Selection, doi:10.1093/protein/gzl017
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org
Received February 19, 2006
Revised March 20, 2006
Accepted March 29, 2006

Article

Extracellular secretion of Escherichia coli alkaline phosphatase with a C-terminal tag by type I secretion system: purification and biochemical characterization

C. Angkawidjaja 1, K. Kuwahara 1, K. Omori 2, Y. Koga 1, K. Takano 3, and S. Kanaya 1 *

1 Department of Material and Life Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
2 Discovery Research Laboratory, Tanabe Seiyaku Co., Ltd., 2-50, Kawagishi-2-chome, Toda, Saitama 335-8505, Japan
3 Department of Material and Life Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan; Presto, JST, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan

* To whom correspondence should be addressed.
S. Kanaya, E-mail: kanaya{at}mls.eng.osaka-u.ac.jp


  Abstract

Type I secretion system (TISS) of Gram-negative bacteria permits proteins to be secreted directly from the cytoplasm to the external medium by a single, energy-coupled step. To examine whether this system can be used as an extracellular production system of recombinant proteins, Escherichia coli alkaline phosphatase (AP) was fused to a C-terminal region of Pseudomonas sp. MIS38 lipase (PML) and examined for secretion using the E.coli cells carrying the heterologous TISS. PML is one of the passenger proteins of TISS and contains 12 repetitive sequences and a secretion signal at the C-terminal region. The fusion protein was efficiently secreted to the extracellular medium, while AP was not secreted at all, indicating that the secretion of AP is promoted by a secretion signal of PML. The repetitive sequences were not so important for secretion of the fusion protein, because the secretion level of the fusion protein containing entire repeats (~10 mg/l culture) was only 2-fold higher than that of the fusion protein without repeats. The fusion protein purified from the culture supernatant existed as a homodimer, like AP, and was indistinguishable from AP in enzymatic properties and stability.

Keywords: alkaline phosphatase; extracellular secretion; repetitive sequences; type I secretion system; {beta}-roll structure.
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