4.4 Article

Quaternary structure of KATP channel SUR2A nucleotide binding domains resolved by synchrotron radiation X-ray scattering

期刊

JOURNAL OF STRUCTURAL BIOLOGY
卷 169, 期 2, 页码 243-251

出版社

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jsb.2009.11.005

关键词

ATP-sensitive K+ channel; Kir6.2; SUR2A; Small-angle X-ray scattering; Mutation; Structure

资金

  1. NIH [R01 HL064822]
  2. Marriott Heart Disease Research Program

向作者/读者索取更多资源

Heterodimeric nucleotide binding domains NBD1/NBD2 distinguish the ATP-binding cassette protein SUR2A, a recognized regulatory subunit of cardiac ATP-sensitive K+ (K-ATP) channels. The tandem function of these core domains ensures metabolism-dependent gating of the Kir6.2 channel pore, yet their structural arrangement has not been resolved. Here, purified monodisperse and interference-free recombinant particles were subjected to synchrotron radiation small-angle X-ray scattering (SAXS) in solution. Intensity function analysis of SAXS profiles resolved NBD1 and NBD2 as octamers. Implemented by ab initio simulated annealing, shape determination prioritized an oblong envelope wrapping NBD1 and NBD2 with respective dimensions of 168 x 80 x 37 angstrom(3) and 175 x 81 x 37 angstrom(3) based on symmetry constraints, validated by atomic force microscopy. Docking crystal structure homology models against SAXS data reconstructed the NBD ensemble surrounding an inner cleft suitable for Kir6.2 insertion. Human heart disease-associated mutations introduced in silica verified the criticality of the mapped protein-protein interface. The resolved quaternary structure delineates thereby a macromolecular arrangement of K-ATP channel SUR2A regulatory domains. (C) 2009 Elsevier Inc. All rights reserved.

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