1SCM image
Deposition Date 1994-01-06
Release Date 1994-04-30
Last Version Date 2024-02-14
Entry Detail
PDB ID:
1SCM
Keywords:
CALCIUM-BINDING PROTEIN
Title:
STRUCTURE OF THE REGULATORY DOMAIN OF SCALLOP MYOSIN AT 2.8 ANGSTROMS RESOLUTION
Biological Source:
Source Organism:
Argopecten irradians (Taxon ID: 31199)
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.80 Å
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
P 1 21 1
1SCM validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Molecule:MYOSIN HEAVY CHAIN
Chain IDs:A
Chain Length:60
Number of Molecules:1
Biological Source:Argopecten irradians
UniProt ID:P24733
Protein Blast
Polymer Type:polypeptide(L)
Molecule:MYOSIN REGULATORY LIGHT CHAIN
Chain IDs:B
Chain Length:145
Number of Molecules:1
Biological Source:Argopecten irradians
UniProt ID:P13543 Pfam ID:PF13499
Protein Blast
Polymer Type:polypeptide(L)
Molecule:MYOSIN ESSENTIAL LIGHT CHAIN
Chain IDs:C
Chain Length:149
Number of Molecules:1
Biological Source:Argopecten irradians
UniProt ID:P07291 Pfam ID:PF13499
Ligand Molecules
CA
Primary Citation
Structure of the regulatory domain of scallop myosin at 2.8 A resolution.
Nature 368 306 312 (1994)
PMID: 8127365 DOI: 10.1038/368306a0

Abstact

The regulatory domain of scallop myosin is a three-chain protein complex that switches on this motor in response to Ca2+ binding. This domain has been crystallized and the structure solved to 2.8 A resolution. Side-chain interactions link the two light chains in tandem to adjacent segments of the heavy chain bearing the IQ-sequence motif. The Ca(2+)-binding site is a novel EF-hand motif on the essential light chain and is stabilized by linkages involving the heavy chain and both light chains, accounting for the requirement of all three chains for Ca2+ binding and regulation in the intact myosin molecule.

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Chemical

Disease

Primary Citation of related structures
1SCM