Journal
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY B-BIOCHEMISTRY & MOLECULAR BIOLOGY
Volume 146, Issue 2, Pages 234-240Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cbpb.2006.10.106
Keywords
Bombyx mori; expression; Kazal-type; purification; serine protease inhibitor; subtilisin inhibitor
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Serine protease inhibitors are essential for host physiological and immunological activities in insects. Analyzing the amino-acid sequence of a cDNA coding for a serine protease inhibitor in Bombyx mori (BMSPI), we found that BmSPI contained three homologous domains with a conserved sequence of C-X-3-C-X-9-C-X-6-Y-X-7-C-X-3-C-X-11-C similar to that of Kazal-type serine protease inhibitors, suggesting BmSPI as a new member of the Kazal-type serine protease inhibitor family. To characterize the three-domain Kazal-type inhibitor from silkworm pupae, the recombinant protein was expressed in Escherichia coli BL21 (DE3) Star. After purification with affinity and reversed-phase chromatographies, the recombinant BmSPI with a molecular mass of 33.642 Da was shown to be a specific subtilisin A inhibitor. Further studies indicated that the K-i value of the recombinant BmSPI was 3.35 nM and the inhibitor seemed to form a 1:1 complex with subtilisin A. This is a first description of the structure and characterization of Kazal-type inhibitor with three domains cloned from silkworm pupae, B. mori. (c) 2006 Published by Elsevier Inc.
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