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2K2F

Solution structure of Ca2+-S100A1-RyRP12

Summary for 2K2F
Entry DOI10.2210/pdb2k2f/pdb
NMR InformationBMRB: 15704
DescriptorRyanodine receptor 1 peptide, Protein S100-A1, CALCIUM ION (3 entities in total)
Functional Keywordss100, ef hand, ryanodine receptor, calcium binding, alternative splicing, calcium channel, calcium transport, glycoprotein, ion transport, ionic channel, membrane, polymorphism, transmembrane, transport, cytoplasm, metal-binding, zinc, metal binding protein
Biological sourceRattus norvegicus (rat)
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Cellular locationCytoplasm: 2K2F
Total number of polymer chains4
Total formula weight23981.18
Authors
Wright, N.T.,Varney, K.M.,Weber, D.J. (deposition date: 2008-04-01, release date: 2008-07-29, Last modification date: 2024-05-29)
Primary citationWright, N.T.,Prosser, B.L.,Varney, K.M.,Zimmer, D.B.,Schneider, M.F.,Weber, D.J.
S100A1 and Calmodulin Compete for the Same Binding Site on Ryanodine Receptor.
J.Biol.Chem., 283:26676-26683, 2008
Cited by
PubMed Abstract: In heart and skeletal muscle an S100 protein family member, S100A1, binds to the ryanodine receptor (RyR) and promotes Ca(2+) release. Using competition binding assays, we further characterized this system in skeletal muscle and showed that Ca(2+)-S100A1 competes with Ca(2+)-calmodulin (CaM) for the same binding site on RyR1. In addition, the NMR structure was determined for Ca(2+)-S100A1 bound to a peptide derived from this CaM/S100A1 binding domain, a region conserved in RyR1 and RyR2 and termed RyRP12 (residues 3616-3627 in human RyR1). Examination of the S100A1-RyRP12 complex revealed residues of the helical RyRP12 peptide (Lys-3616, Trp-3620, Lys-3622, Leu-3623, Leu-3624, and Lys-3626) that are involved in favorable hydrophobic and electrostatic interactions with Ca(2+)-S100A1. These same residues were shown previously to be important for RyR1 binding to Ca(2+)-CaM. A model for regulating muscle contraction is presented in which Ca(2+)-S100A1 and Ca(2+)-CaM compete directly for the same binding site on the ryanodine receptor.
PubMed: 18650434
DOI: 10.1074/jbc.M804432200
PDB entries with the same primary citation
Experimental method
SOLUTION NMR
Structure validation

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