Calcineurin B subunit interacts with proteasome subunit alpha type 7 and represses hypoxia-inducible factor-1α activity via the proteasome pathway.

The calcineurin (CN) B subunit (CNB) is the regulatory subunit of CN, which is the only serine/threonine-specific protein phosphatase regulated by Ca2+/CaM. It has been shown to have potential as an anticancer agent, and has a positive effect on the phagocytic index and coefficient. We report here that CNB binds ...
to proteasome subunit alpha type 7 (PSMA7) and inhibits the transactivation activity of hypoxia-inducible factor-1α (HIF-1α) via the proteasome pathway. In addition, we show that CNB represses the expression of vascular endothelial growth factor (VEGF), which is regulated by HIF-1α. These results indicate that CNB modulates cellular proteasome activity via a specific interaction with PSMA7. This may provide a molecular basis for its anticancer and antiviral activities.
Mesh Terms:
Animals, Calcineurin, Cell Line, Tumor, Humans, Hypoxia-Inducible Factor 1, alpha Subunit, Mice, Proteasome Endopeptidase Complex
Biochem. Biophys. Res. Commun.
Date: Feb. 18, 2011
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