1p97
From Proteopedia
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'''NMR structure of the C-terminal PAS domain of HIF2a''' | '''NMR structure of the C-terminal PAS domain of HIF2a''' | ||
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[[Category: Gardner, K H.]] | [[Category: Gardner, K H.]] | ||
[[Category: Karakuzu, O.]] | [[Category: Karakuzu, O.]] | ||
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Revision as of 01:50, 3 May 2008
NMR structure of the C-terminal PAS domain of HIF2a
Contents |
Overview
Biological responses to oxygen availability play important roles in development, physiological homeostasis, and many disease processes. In mammalian cells, this adaptation is mediated in part by a conserved pathway centered on the hypoxia-inducible factor (HIF). HIF is a heterodimeric protein complex composed of two members of the basic helix-loop-helix Per-ARNT-Sim (PAS) (ARNT, aryl hydrocarbon receptor nuclear translocator) domain family of transcriptional activators, HIFalpha and ARNT. Although this complex involves protein-protein interactions mediated by basic helix-loop-helix and PAS domains in both proteins, the role played by the PAS domains is poorly understood. To address this issue, we have studied the structure and interactions of the C-terminal PAS domain of human HIF-2alpha by NMR spectroscopy. We demonstrate that HIF-2alpha PAS-B binds the analogous ARNT domain in vitro, showing that residues involved in this interaction are located on the solvent-exposed side of the HIF-2alpha central beta-sheet. Mutating residues at this surface not only disrupts the interaction between isolated PAS domains in vitro but also interferes with the ability of full-length HIF to respond to hypoxia in living cells. Extending our findings to other PAS domains, we find that this beta-sheet interface is widely used for both intra- and intermolecular interactions, suggesting a basis of specificity and regulation of many types of PAS-containing signaling proteins.
Disease
Known disease associated with this structure: Erythrocytosis, familial, 4 OMIM:[603349]
About this Structure
1P97 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Structural basis for PAS domain heterodimerization in the basic helix--loop--helix-PAS transcription factor hypoxia-inducible factor., Erbel PJ, Card PB, Karakuzu O, Bruick RK, Gardner KH, Proc Natl Acad Sci U S A. 2003 Dec 23;100(26):15504-9. Epub 2003 Dec 10. PMID:14668441 Page seeded by OCA on Sat May 3 04:50:29 2008
