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Arch Biochem Biophys. 2012 Feb 15;518(2):103-10. doi: 10.1016/j.abb.2011.12.023. Epub 2012 Jan 3.

The interaction of the von Hippel-Lindau tumor suppressor and heterochromatin protein 1.

Author information

1
Greehey Children's Cancer Research Institute, The University of Texas Health Science Center, San Antonio, TX 78229-3900, USA.

Abstract

Inactivation of the von Hippel-Lindau (VHL) tumor suppressor is associated with renal carcinoma, hemangioblastoma and pheochromocytoma. The VHL protein is a component of a ubiquitin ligase complex that ubiquitinates and degrades hypoxia inducible factor-α (HIF-α). Degradation of HIF-α by VHL is proposed to suppress tumorigenesis and tumor angiogenesis. Several lines of evidence also suggest important roles for HIF-independent VHL functions in tumor suppression and other biological processes. Using GST-VHL pull-down experiment and mass spectrometry, we detected an interaction between VHL and heterochromatin protein 1 (HP1). We identified a conserved HP1-binding motif (PXVXL) in the β domain of VHL, which is disrupted in a renal carcinoma-associated P81S mutant. We show that the VHL P81S mutant displays reduced binding to HP1, yet retains the ability to interact with elongin B, elongin C, and cullin 2 and is fully capable of degrading HIF-α. We also demonstrate that HP1 increases the chromatin association of VHL. These results suggest a role for the VHL-HP1 interaction in VHL chromatin targeting.

PMID:
22234250
PMCID:
PMC3274591
DOI:
10.1016/j.abb.2011.12.023
[Indexed for MEDLINE]
Free PMC Article

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