Ribostamycin inhibits the chaperone activity of protein disulfide isomerase.

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Horibe T, Nagai H, Sakakibara K, Hagiwara Y, Kikuchi M

Ribostamycin inhibits the chaperone activity of protein disulfide isomerase.

Biochem Biophys Res Commun. 2001 Dec 21;289(5):967-72.

PubMed ID

11741285 [ View in PubMed

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Abstract

In the process of screening of proteins binding to ribostamycin in bovine liver using the affinity column chromatography, we found that ribostamycin inhibited the chaperone activity of protein disulfide isomerase (PDI), but it did not inhibit the isomerase activity. PDI was identified by SDS-PAGE, Western blotting, and N-terminal amino acid sequence analysis. A 100:1 molar ratio of ribostamycin to PDI was almost sufficient to completely inhibit the chaperone activity of PDI. The binding affinity of ribostamycin to purified bovine PDI was determined by the Biacore system, which gave a K(D) value of 3.19 x 10(-4) M. This suggests that ribostamycin binds to region distinct from the CGHC motif of PDI. This is the first report to describe the inhibitor of the chaperone activity of PDI.

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Drug Targets

Drug	Target	Kind	Organism	Pharmacological Action	Actions
Ribostamycin	Protein disulfide-isomerase	Protein	Humans	Unknown	Not Available	Details