Domain structure of bi-functional selenoprotein P

Author:

SAITO Yoshiro12,SATO Noriko1,HIRASHIMA Masaki3,TAKEBE Gen1,NAGASAWA Shigeharu1,TAKAHASHI Kazuhiko1

Affiliation:

1. Department of Hygienic Chemistry, Graduate School of Pharmaceutical Sciences, Hokkaido University, Kita 12 Nishi 6, Kita-ku, Sapporo 060-0812, Japan

2. Human Stress Signal Research Center, National Institute of Advanced Industrial Science and Technology, 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan

3. The Chemo-Sero-Therapeutic Research Institute, Kawabe, Kyokushi, Kikuchi-gun, Kumamoto 869-1298, Japan

Abstract

Human selenoprotein P (SeP), a selenium-rich plasma glycoprotein, is presumed to contain ten selenocysteine residues; one of which is located at the 40th residue in the N-terminal region and the remaining nine localized in the C-terminal third part. We have shown that SeP not only catalyses the reduction of phosphatidylcholine hydroperoxide by glutathione [Saito, Hayashi, Tanaka, Watanabe, Suzuki, Saito and Takahashi (1999) J. Biol. Chem. 274, 2866–2871], but also supplies its selenium to proliferating cells [Saito and Takahashi (2002) Eur. J. Biochem. 269, 5746–5751]. Treatment of SeP with plasma kallikrein resulted in a sequential limited proteolysis (Arg-235–Gln-236 and Arg-242–Asp-243). The N-terminal (residues 1–235) and C-terminal (residues 243–361) fragments exhibited enzyme activity and selenium-supply activity respectively. These results confirm that SeP is a bi-functional protein and suggest that the first selenocysteine residue is the active site of the enzyme and the remaining nine residues function as a selenium supplier.

Publisher

Portland Press Ltd.

Subject

Cell Biology,Molecular Biology,Biochemistry

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