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A more recent version of this article appeared on March 11, 2005
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M413755200v1
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Papers In Press, published online ahead of print January 4, 2005
J. Biol. Chem, 10.1074/jbc.M413755200
Submitted on December 7, 2004
Revised on December 29, 2004
Accepted on December 29, 2004

GPI7 is the second partner of PIG-F and involved in modification of glycosylphosphatidylinositol

Nobue Shishioh, Yeongjin Hong, Kazuhito Ohishi, Hisashi Ashida, Yusuke Maeda, and Taroh Kinoshita

Research Institute for Microbial Diseases, Osaka University, Suita, Osaka 565-0871

Corresponding Author: tkinoshi{at}biken.osaka-u.ac.jp

Many eukaryotic cell surface proteins are anchored to the membrane via glycosylphosphatidylinositol (GPI). GPI is synthesized from phosphatidylinositol by stepwise reactions and attached en bloc to nascent proteins. In mammalian cells, the major GPI species transferred to proteins is termed H7. By attachment of an additional ethanolaminephosphate (EtNP) to the second mannose, H7 can be converted to H8, which acts as a minor type of protein-linked GPI and also exists as a free GPI on the cell surface. Yeast GPI7 is involved in the transfer of EtNP to the second mannose, but the corresponding mammalian enzyme has not yet been clarified. Here, we report that the human homolog of Gpi7p (hGPI7) forms a protein complex with PIG-F and is involved in the H7-to-H8 conversion. We knocked down hGPI7 by RNA interference and found that H7 was accumulated with little production of H8. Immunoprecipitation experiments revealed that hGPI7 was associated with and stabilized by PIG-F, which is known to bind to and stabilize PIG-O, a protein homologous to hGPI7. PIG-O is a transferase that adds EtNP to the third mannose, rendering GPI capable of attaching to proteins. We further found that the overexpression of hGPI7 decreased the level of PIG-O and transfer of EtNP to the third mannose. Finally, we propose a mechanism for the regulation of GPI biosynthesis through competition between the two independent enzymes, PIG-O and hGPI7, for the common stabilizer, PIG-F.


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