1sji

Comparing skeletal and cardiac calsequestrin structures and their calcium binding: a proposed mechanism for coupled calcium binding and protein polymerizationComparing skeletal and cardiac calsequestrin structures and their calcium binding: a proposed mechanism for coupled calcium binding and protein polymerization

Structural highlights

1sji is a 2 chain structure with sequence from Canis lupus familiaris. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 2.4Å
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

CASQ2_CANLF Calsequestrin is a high-capacity, moderate affinity, calcium-binding protein and thus acts as an internal calcium store in muscle (PubMed:3427023). Calcium ions are bound by clusters of acidic residues at the protein surface, especially at the interface between subunits. Can bind around 60 Ca(2+) ions. Regulates the release of lumenal Ca(2+) via the calcium release channel RYR2; this plays an important role in triggering muscle contraction. Plays a role in excitation-contraction coupling in the heart and in regulating the rate of heart beats.^[1] ^[2] ^[3]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

References

↑ Park H, Park IY, Kim E, Youn B, Fields K, Dunker AK, Kang C. Comparing skeletal and cardiac calsequestrin structures and their calcium binding: a proposed mechanism for coupled calcium binding and protein polymerization. J Biol Chem. 2004 Apr 23;279(17):18026-33. Epub 2004 Feb 10. PMID:14871888 doi:10.1074/jbc.M311553200
↑ Kirchhefer U, Wehrmeister D, Postma AV, Pohlentz G, Mormann M, Kucerova D, Müller FU, Schmitz W, Schulze-Bahr E, Wilde AA, Neumann J. The human CASQ2 mutation K206N is associated with hyperglycosylation and altered cellular calcium handling. J Mol Cell Cardiol. 2010 Jul;49(1):95-105. PMID:20302875 doi:10.1016/j.yjmcc.2010.03.006
↑ Slupsky JR, Ohnishi M, Carpenter MR, Reithmeier RA. Characterization of cardiac calsequestrin. Biochemistry. 1987 Oct 6;26(20):6539-44. PMID:3427023 doi:10.1021/bi00394a038

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OCA

[1] Park H, Park IY, Kim E, Youn B, Fields K, Dunker AK, Kang C. Comparing skeletal and cardiac calsequestrin structures and their calcium binding: a proposed mechanism for coupled calcium binding and protein polymerization. J Biol Chem. 2004 Apr 23;279(17):18026-33. Epub 2004 Feb 10. PMID:14871888 doi:10.1074/jbc.M311553200

[2] Kirchhefer U, Wehrmeister D, Postma AV, Pohlentz G, Mormann M, Kucerova D, Müller FU, Schmitz W, Schulze-Bahr E, Wilde AA, Neumann J. The human CASQ2 mutation K206N is associated with hyperglycosylation and altered cellular calcium handling. J Mol Cell Cardiol. 2010 Jul;49(1):95-105. PMID:20302875 doi:10.1016/j.yjmcc.2010.03.006

[3] Slupsky JR, Ohnishi M, Carpenter MR, Reithmeier RA. Characterization of cardiac calsequestrin. Biochemistry. 1987 Oct 6;26(20):6539-44. PMID:3427023 doi:10.1021/bi00394a038

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1sji

Structural highlights

Function

Evolutionary Conservation

References

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1sji

Structural highlights

Function

Evolutionary Conservation

References

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