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Rigor-like structures of muscle myosins reveal key mechanical elements in the transduction pathways of this allosteric motor

X-ray diffraction
3.27Å resolution
PDB entry 2os8 coloured by chain, front view.
PDB entry 2os8 coloured by chain, side view.
PDB entry 2os8 coloured by chain, top view.
Source organism: Placopecten magellanicus
Assembly composition:
hetero trimer (preferred)
Entry contents: 3 distinct polypeptide molecules

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Assemblies

Assembly 1 (preferred)
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Assembly Name: EF-hand domain-containing protein and Myosin heavy chain
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Multimeric state: hetero trimer
Accessible surface area: 53865.16 Å2
Buried surface area: 8165.24 Å2
Dissociation area: 2,281.69 Å2
Dissociation energy (ΔGdiss): 26.76 kcal/mol
Dissociation entropy (TΔSdiss): 13.57 kcal/mol
Symmetry number: 1
PDBe Complex ID: PDB-CPX-173237

Macromolecules

Myosin heavy chain
Chain: A
Length: 840 amino acids
Theoretical weight: 96.14 KDa
Source organism: Placopecten magellanicus
UniProt:
  • Canonical: Q26080 (Residues: 1-840; Coverage: 43%)
Pfam:
InterPro:
Myosin heavy chain in PDB entry 2os8, assembly 1, front view.
Myosin heavy chain in PDB entry 2os8, assembly 1, side view.
Myosin heavy chain in PDB entry 2os8, assembly 1, top view.
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EF-hand domain-containing protein
Chain: B
Length: 157 amino acids
Theoretical weight: 17.77 KDa
Source organism: Placopecten magellanicus
UniProt:
  • Canonical: Q26068 (Residues: 1-157; Coverage: 100%)
Pfam: EF-hand domain pair
InterPro:
CATH: EF-hand
EF-hand domain-containing protein in PDB entry 2os8, assembly 1, front view.
EF-hand domain-containing protein in PDB entry 2os8, assembly 1, side view.
EF-hand domain-containing protein in PDB entry 2os8, assembly 1, top view.
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EF-hand domain-containing protein
Chain: C
Length: 157 amino acids
Theoretical weight: 17.81 KDa
Source organism: Placopecten magellanicus
UniProt:
  • Canonical: Q26066 (Residues: 1-157; Coverage: 100%)
Pfam: EF-hand domain pair
InterPro:
CATH: EF-hand
EF-hand domain-containing protein in PDB entry 2os8, assembly 1, front view.
EF-hand domain-containing protein in PDB entry 2os8, assembly 1, side view.
EF-hand domain-containing protein in PDB entry 2os8, assembly 1, top view.
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