J. Biochem, 1990, Vol. 108, No. 2 230-234
© 1990 Japanese Biochemical Society
research-article |
Molecular Cloning and Sequencing of the cDNA of Rat
1-Protease Inhibitor and Its Expression in COS-1 Cells1
Department of Biochemistry and Radioisotope Laboratory, Fukuoka Unwersity School of Medicine Jonan-ku, Fukuoka, Fukuoka 814-01
2To whom correspondence should be addressed
A cDNA clone for
1-protease inhibitor (pc
1PI212) was isolated from a
ZAP rat liver cDNA library. The 1.4 kb cDNA insert of pc
1PI212 contained an open reading frame that encodes a 411-residue polypeptide (48,125 Da), in which a signal peptide of 24 residues was identified by comparison with the NH2-terminal sequence of the purified protein. Three potential sites for N-linked glycosylation were found in the molecule, accounting for the difference in molecular mass between the predicted form and the purified protein (56 kDa). The deduced primary structure of rat
-protease inhibitor showed 68.5% homology to that of the human Inhibitor. We then constructed the expression plasmid pSV2a from pSV2-gpt and pc
1 and transfected It into COS-1 cells. The transfected cells synthe sized a molecule which was precipitated with anti-(rat
1 inhibitor)-IgG and had the same molecular size as that of the inhibitor produced by rat hepatocytes.
1This work was supported in part by a Grants-in-Aid for Scientific Research from the Ministry of Education, Science and Culture of Japan.
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