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| | <StructureSection load='5crd' size='340' side='right'caption='[[5crd]], [[Resolution|resolution]] 2.08Å' scene=''> | | <StructureSection load='5crd' size='340' side='right'caption='[[5crd]], [[Resolution|resolution]] 2.08Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[5crd]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5CRD OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5CRD FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[5crd]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5CRD OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5CRD FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=MPD:(4S)-2-METHYL-2,4-PENTANEDIOL'>MPD</scene></td></tr> | + | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=MPD:(4S)-2-METHYL-2,4-PENTANEDIOL'>MPD</scene></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">CASQ1, CASQ ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</td></tr>
| + | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=5crd FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5crd OCA], [https://pdbe.org/5crd PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5crd RCSB], [https://www.ebi.ac.uk/pdbsum/5crd PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5crd ProSAT]</span></td></tr> |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5crd FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5crd OCA], [http://pdbe.org/5crd PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5crd RCSB], [http://www.ebi.ac.uk/pdbsum/5crd PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5crd ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/CASQ1_HUMAN CASQ1_HUMAN]] Calsequestrin is a high-capacity, moderate affinity, calcium-binding protein and thus acts as an internal calcium store in muscle. Calcium ions are bound by clusters of acidic residues at the protein surface, often at the interface between subunits. Can bind around 80 Ca(2+) ions. Regulates the release of lumenal Ca(2+) via the calcium release channel RYR1; this plays an important role in triggering muscle contraction.<ref>PMID:22337878</ref> <ref>PMID:22337878</ref> | + | [https://www.uniprot.org/uniprot/CASQ1_HUMAN CASQ1_HUMAN] Calsequestrin is a high-capacity, moderate affinity, calcium-binding protein and thus acts as an internal calcium store in muscle. Calcium ions are bound by clusters of acidic residues at the protein surface, often at the interface between subunits. Can bind around 80 Ca(2+) ions. Regulates the release of lumenal Ca(2+) via the calcium release channel RYR1; this plays an important role in triggering muscle contraction.<ref>PMID:22337878</ref> <ref>PMID:22337878</ref> |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Human]] | + | [[Category: Homo sapiens]] |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Kang, C]] | + | [[Category: Kang C]] |
| - | [[Category: Lewis, K M]] | + | [[Category: Lewis KM]] |
| - | [[Category: Ronish, L A]] | + | [[Category: Ronish LA]] |
| - | [[Category: Calcium binding protein]]
| + | |
| Structural highlights
Function
CASQ1_HUMAN Calsequestrin is a high-capacity, moderate affinity, calcium-binding protein and thus acts as an internal calcium store in muscle. Calcium ions are bound by clusters of acidic residues at the protein surface, often at the interface between subunits. Can bind around 80 Ca(2+) ions. Regulates the release of lumenal Ca(2+) via the calcium release channel RYR1; this plays an important role in triggering muscle contraction.[1] [2]
Publication Abstract from PubMed
Calsequestrin 1 is the principal Ca(2+) storage protein of the sarcoplasmic reticulum of skeletal muscle. Its inheritable D244G mutation causes a myopathy with vacuolar aggregates, whereas its M87T "variant" is weakly associated with malignant hyperthermia. We characterized the consequences of these mutations with studies of the human proteins in vitro. Equilibrium dialysis and turbidity measurements showed that D244G and, to a lesser extent, M87T partially lose Ca(2+) binding exhibited by wild type calsequestrin 1 at high Ca(2+) concentrations. D244G aggregates abruptly and abnormally, a property that fully explains the protein inclusions that characterize its phenotype. D244G crystallized in low Ca(2+) concentrations lacks two Ca(2+) ions normally present in wild type that weakens the hydrophobic core of Domain II. D244G crystallized in high Ca(2+) concentrations regains its missing ions and Domain II order but shows a novel dimeric interaction. The M87T mutation causes a major shift of the alpha-helix bearing the mutated residue, significantly weakening the back-to-back interface essential for tetramerization. D244G exhibited the more severe structural and biophysical property changes, which matches the different pathophysiological impacts of these mutations.
Characterization of Two Human Skeletal Calsequestrin Mutants Implicated in Malignant Hyperthermia and Vacuolar Aggregate Myopathy.,Lewis KM, Ronish LA, Rios E, Kang C J Biol Chem. 2015 Nov 27;290(48):28665-74. doi: 10.1074/jbc.M115.686261. Epub, 2015 Sep 28. PMID:26416891[3]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Sanchez EJ, Lewis KM, Danna BR, Kang C. High-capacity Ca2+-binding of human skeletal calsequestrin. J Biol Chem. 2012 Feb 15. PMID:22337878 doi:10.1074/jbc.M111.335075
- ↑ Sanchez EJ, Lewis KM, Danna BR, Kang C. High-capacity Ca2+-binding of human skeletal calsequestrin. J Biol Chem. 2012 Feb 15. PMID:22337878 doi:10.1074/jbc.M111.335075
- ↑ Lewis KM, Ronish LA, Rios E, Kang C. Characterization of Two Human Skeletal Calsequestrin Mutants Implicated in Malignant Hyperthermia and Vacuolar Aggregate Myopathy. J Biol Chem. 2015 Nov 27;290(48):28665-74. doi: 10.1074/jbc.M115.686261. Epub, 2015 Sep 28. PMID:26416891 doi:http://dx.doi.org/10.1074/jbc.M115.686261
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