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ERp57 Binds Competitively to Protein Disulfide Isomerase and Calreticulin

ERp57 Binds Competitively to Protein Disulfide Isomerase and Calreticulin

Taiji Kimura, Keisuke Imaishi, Yasunari Hagiwara, Tomohisa Horibe, Toshiya Hayano, Nobuhiro Takahashi, Reiko Urade, Koichi Kato, Masakazu Kikuchi

Biochem Biophys Res Commun. 2005 May 27;331(1):224-30.

PMID: 15845382

Abstract:

In this study, we screened for protein disulfide isomerase (PDI)-binding proteins in bovine liver microsomes under strict salt concentrations, using affinity column chromatography. One main band observed using SDS-PAGE was identified as ERp57 (one of the PDI family proteins) by LC-MS/MS analysis. The K(D) value of PDI binding to ERp57 was calculated as 5.46x10(-6)M with the BIACORE system. The interactions between PDI and ERp57 occurred specifically at their a and b domains, respectively. Interestingly, low concentrations of ERp57 enhanced the chaperone activity of PDI, while high concentrations interfered with chaperone activity. On the other hand, ERp57 did not affect the isomerase activity of PDI. Additionally, following pre-incubation of ERp57 with calreticulin (CRT), decreased interactions were observed between ERp57 and PDI, and vice versa. Based on the data, we propose that once ERp57 binds to PDI or CRT, the resultant complex inhibits further interactions. Therefore, ERp57 selectively forms a protein-folding complex with PDI or CRT in ER.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP154837419	Calreticulin from bovine liver		154837-41-9	Price

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