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Crystal structure of calsequestrin from rabbit skeletal muscle sarcoplasmic reticulum

Nature Structural Biology volume 5, pages 476–483 (1998)Cite this article

Abstract

Calsequestrin, the major Ca2+ storage protein of muscle, coordinately binds and releases 40–50 Ca2+ ions per molecule for each contraction-relaxation cycle by an uncertain mechanism. We have determined the structure of rabbit skeletal muscle calsequestrin. Three very negative thioredoxin-like domains surround a hydrophilic center. Each monomer makes two extensive dimerization contacts, both of which involve the approach of many negative groups. This structure suggests a mechanism by which calsequestrin may achieve high capacity Ca2+ binding. The suggested mechanism involves Ca2+-induced collapse of the three domains and polymerization of calsequestrin monomers arising from three factors: N-terminal arm exchange, helix–helix contacts and Ca2+ cross bridges. This proposed structure-based mechanism accounts for the observed coupling of high capacity Ca2+ binding with protein precipitation.

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Authors and Affiliations

  1. Department of Biochemistry and Biophysics, Washington State University, Pullman, Washington, 99164-4660, USA

    Shuren Wang, A. Keith Dunker & ChulHee Kang

  2. Department of Bacteriology and Biochemistry, University of Idaho, Moscow, Idaho, 83843, USA

    William R. Trumble, Hong Liao & Carla R. Wesson

  3. McFadden BXRC Center, Washington State University, Pullman, Washington, 99164, USA

    ChulHee Kang

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Wang, S., Trumble, W., Liao, H. et al. Crystal structure of calsequestrin from rabbit skeletal muscle sarcoplasmic reticulum. Nat Struct Mol Biol 5, 476–483 (1998). https://doi.org/10.1038/nsb0698-476

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