Annotations: 9YAQ

The structure of the cardiac native cross bridge in the rigor state, myosin heads bound to actin molecules 5 and 6.

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
N	SCOP2B Superfamily	EF-hand	8104309	3001983	SCOP2B (2022-06-29)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
N	PF13833	EF-hand domain pair (EF-hand_8)	EF-hand domain pair		Domain
N	PF13499	EF-hand domain pair (EF-hand_7)	EF-hand domain pair		Domain
J, K	PF02736	Myosin N-terminal SH3-like domain (Myosin_N)	Myosin N-terminal SH3-like domain	This domain has an SH3-like fold. It is found at the N-terminus of many but not all myosins. The function of this domain is unknown.	Domain
J, K	PF00063	Myosin head (motor domain) (Myosin_head)	Myosin head (motor domain)		Domain
I, P	PF00992	Troponin (Troponin)	Troponin	-	Family
E, F, G, H	PF00261	Tropomyosin (Tropomyosin)	Tropomyosin	-	Coiled-coil
A, B, C, D	PF00022	Actin (Actin)	Actin	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
O	Troponin I, cardiac muscle	cytoskeletal protein binding actin binding protein binding binding	-	striated muscle thin filament protein-containing complex intracellular anatomical structure myofilament intracellular membraneless organelle actin cytoskeleton sarcomere intracellular organelle cellular anatomical structure troponin complex cytoskeleton organelle membraneless organelle contractile muscle fiber striated muscle thin filament protein-containing complex intracellular anatomical structure myofilament intracellular membraneless organelle actin cytoskeleton sarcomere intracellular organelle cellular anatomical structure troponin complex cytoskeleton organelle membraneless organelle contractile muscle fiber cytoplasm supramolecular fiber myofibril supramolecular polymer supramolecular complex
N	Troponin C, slow skeletal and cardiac muscles	cytoskeletal protein binding protein binding binding troponin T binding cation binding ion binding calcium ion binding metal ion binding small molecule binding actin binding protein-containing complex binding actin filament binding identical protein binding protein homodimerization activity cytoskeletal protein binding protein binding binding troponin T binding cation binding ion binding calcium ion binding metal ion binding small molecule binding actin binding protein-containing complex binding actin filament binding identical protein binding protein homodimerization activity protein dimerization activity calcium-dependent protein binding troponin I binding	heart process multicellular organismal process system process circulatory system process cardiac muscle contraction heart contraction muscle contraction muscle system process blood circulation striated muscle contraction cardiac muscle cell contraction actin filament-based movement actin filament-based process cellular process heart process multicellular organismal process system process circulatory system process cardiac muscle contraction heart contraction muscle contraction muscle system process blood circulation striated muscle contraction cardiac muscle cell contraction actin filament-based movement actin filament-based process cellular process actin-mediated cell contraction multicellular organismal movement musculoskeletal movement nervous system process neuromuscular process skeletal muscle contraction ventricular cardiac muscle tissue morphogenesis heart morphogenesis striated muscle tissue development muscle structure development multicellular organism development ventricular cardiac muscle tissue development anatomical structure development cardiac chamber development animal organ morphogenesis muscle tissue development muscle organ development system development developmental process heart development cardiac chamber morphogenesis cardiac muscle tissue development animal organ development tissue development muscle tissue morphogenesis circulatory system development anatomical structure morphogenesis tissue morphogenesis cardiac ventricle morphogenesis cardiac muscle tissue morphogenesis cardiac ventricle development animal gross anatomical part developmental process muscle organ morphogenesis regulation of localization cellular localization regulation of cellular process regulation of actin filament-based process transport muscle filament sliding regulation of system process localization establishment of localization in cell regulation of multicellular organismal process regulation of biological quality regulation of intracellular transport actin-myosin filament sliding regulation of biological process regulation of transport regulation of muscle filament sliding speed biological regulation intracellular transport regulation of muscle system process establishment of localization regulation of muscle contraction regulation of cellular localization regulation of actin filament-based movement regulation of muscle filament sliding	striated muscle thin filament protein-containing complex intracellular anatomical structure myofilament intracellular membraneless organelle actin cytoskeleton sarcomere intracellular organelle cellular anatomical structure troponin complex cytoskeleton organelle membraneless organelle contractile muscle fiber striated muscle thin filament protein-containing complex intracellular anatomical structure myofilament intracellular membraneless organelle actin cytoskeleton sarcomere intracellular organelle cellular anatomical structure troponin complex cytoskeleton organelle membraneless organelle contractile muscle fiber cardiac Troponin complex cytoplasm supramolecular fiber myofibril supramolecular polymer supramolecular complex
L, M	Myosin light chain 3	cation binding ion binding binding calcium ion binding metal ion binding small molecule binding cytoskeletal motor activity cytoskeletal protein binding actin monomer binding actin binding protein binding	heart process multicellular organismal process system process regulation of biological process regulation of heart contraction regulation of system process biological regulation circulatory system process regulation of blood circulation regulation of multicellular organismal process regulation of biological quality heart contraction regulation of the force of heart contraction blood circulation heart process multicellular organismal process system process regulation of biological process regulation of heart contraction regulation of system process biological regulation circulatory system process regulation of blood circulation regulation of multicellular organismal process regulation of biological quality heart contraction regulation of the force of heart contraction blood circulation muscle contraction regulation of muscle system process muscle system process striated muscle contraction regulation of striated muscle contraction regulation of muscle contraction cardiac muscle contraction ventricular cardiac muscle tissue morphogenesis heart morphogenesis striated muscle tissue development muscle structure development multicellular organism development ventricular cardiac muscle tissue development anatomical structure development cardiac chamber development animal organ morphogenesis muscle tissue development muscle organ development system development developmental process heart development cardiac chamber morphogenesis cardiac muscle tissue development animal organ development tissue development muscle tissue morphogenesis circulatory system development anatomical structure morphogenesis tissue morphogenesis cardiac ventricle morphogenesis cardiac muscle tissue morphogenesis cardiac ventricle development animal gross anatomical part developmental process muscle organ morphogenesis	protein-containing complex intracellular anatomical structure intracellular membraneless organelle actin cytoskeleton myosin complex intracellular organelle cellular anatomical structure cytoskeleton organelle membraneless organelle myosin II complex sarcomere contractile muscle fiber A band protein-containing complex intracellular anatomical structure intracellular membraneless organelle actin cytoskeleton myosin complex intracellular organelle cellular anatomical structure cytoskeleton organelle membraneless organelle myosin II complex sarcomere contractile muscle fiber A band cytoplasm supramolecular fiber myofibril supramolecular polymer supramolecular complex I band
J, K	Myosin-7	binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding anion binding adenyl nucleotide binding ATP binding heterocyclic compound binding carbohydrate derivative binding ribonucleotide binding binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding anion binding adenyl nucleotide binding ATP binding heterocyclic compound binding carbohydrate derivative binding ribonucleotide binding small molecule binding cytoskeletal protein binding actin binding protein-containing complex binding protein binding actin filament binding calmodulin binding polypeptide conformation or assembly isomerase activity isomerase activity cytoskeletal motor activity microfilament motor activity macromolecular conformation isomerase activity catalytic activity ATP-dependent activity	heart process multicellular organismal process system process circulatory system process cardiac muscle contraction heart contraction muscle contraction muscle system process blood circulation striated muscle contraction developmental process heart development multicellular organism development anatomical structure development heart process multicellular organismal process system process circulatory system process cardiac muscle contraction heart contraction muscle contraction muscle system process blood circulation striated muscle contraction developmental process heart development multicellular organism development anatomical structure development animal organ development adult heart development animal gross anatomical part developmental process circulatory system development system development muscle filament sliding actin filament-based process cellular process actin-mediated cell contraction actin filament-based movement actin-myosin filament sliding	protein-containing complex intracellular anatomical structure intracellular membraneless organelle actin cytoskeleton myosin complex intracellular organelle cellular anatomical structure cytoskeleton organelle membraneless organelle myosin II complex sarcomere contractile muscle fiber cytoplasm protein-containing complex intracellular anatomical structure intracellular membraneless organelle actin cytoskeleton myosin complex intracellular organelle cellular anatomical structure cytoskeleton organelle membraneless organelle myosin II complex sarcomere contractile muscle fiber cytoplasm supramolecular fiber myofibril supramolecular polymer supramolecular complex myosin filament
I, P	Troponin T2, cardiac type	-	multicellular organismal process system process regulation of biological process regulation of muscle contraction regulation of system process biological regulation regulation of multicellular organismal process muscle contraction regulation of muscle system process muscle system process	striated muscle thin filament protein-containing complex intracellular anatomical structure myofilament intracellular membraneless organelle actin cytoskeleton sarcomere intracellular organelle cellular anatomical structure troponin complex cytoskeleton organelle membraneless organelle contractile muscle fiber striated muscle thin filament protein-containing complex intracellular anatomical structure myofilament intracellular membraneless organelle actin cytoskeleton sarcomere intracellular organelle cellular anatomical structure troponin complex cytoskeleton organelle membraneless organelle contractile muscle fiber cytoplasm supramolecular fiber myofibril supramolecular polymer supramolecular complex
E, F, G, H	Tropomyosin alpha-1 chain	protein heterodimerization activity protein binding binding protein dimerization activity cytoskeletal protein binding actin binding protein-containing complex binding actin filament binding identical protein binding protein homodimerization activity	cellular component organization organelle organization actin cytoskeleton organization actin filament organization actin filament-based process cellular process cellular component organization or biogenesis supramolecular fiber organization cytoskeleton organization heart process multicellular organismal process system process circulatory system process cardiac muscle contraction cellular component organization organelle organization actin cytoskeleton organization actin filament organization actin filament-based process cellular process cellular component organization or biogenesis supramolecular fiber organization cytoskeleton organization heart process multicellular organismal process system process circulatory system process cardiac muscle contraction heart contraction muscle contraction muscle system process blood circulation striated muscle contraction	polymeric cytoskeletal fiber intracellular anatomical structure actin filament intracellular membraneless organelle actin cytoskeleton intracellular organelle cellular anatomical structure cytoskeleton organelle membraneless organelle supramolecular fiber supramolecular polymer supramolecular complex
A, B, C, D	Actin, alpha cardiac muscle 1	binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding anion binding adenyl nucleotide binding ATP binding heterocyclic compound binding carbohydrate derivative binding ribonucleotide binding binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding anion binding adenyl nucleotide binding ATP binding heterocyclic compound binding carbohydrate derivative binding ribonucleotide binding small molecule binding cytoskeletal protein binding protein binding myosin binding structural constituent of cytoskeleton structural molecule activity	actin filament-based process cellular process actin-mediated cell contraction actin filament-based movement actin-myosin filament sliding heart process multicellular organismal process system process circulatory system process heart contraction blood circulation developmental process mesenchyme migration mesenchyme morphogenesis actin filament-based process cellular process actin-mediated cell contraction actin filament-based movement actin-myosin filament sliding heart process multicellular organismal process system process circulatory system process heart contraction blood circulation developmental process mesenchyme migration mesenchyme morphogenesis animal organ development mesenchyme development tissue development tissue morphogenesis anatomical structure morphogenesis tissue migration anatomical structure development animal organ morphogenesis animal gross anatomical part developmental process regulation of biosynthetic process regulation of biological process regulation of cellular process biological regulation positive regulation of biological process regulation of macromolecule metabolic process gene expression macromolecule biosynthetic process positive regulation of macromolecule biosynthetic process regulation of gene expression positive regulation of metabolic process biosynthetic process positive regulation of gene expression positive regulation of biosynthetic process regulation of macromolecule biosynthetic process metabolic process positive regulation of macromolecule metabolic process macromolecule metabolic process regulation of metabolic process positive regulation of cellular process cellular component organization organelle organization actin cytoskeleton organization actin filament organization cellular component organization or biogenesis supramolecular fiber organization cytoskeleton organization	cell projection cellular anatomical structure cell leading edge plasma membrane bounded cell projection lamellipodium intracellular anatomical structure intracellular membraneless organelle sarcomere intracellular organelle organelle membraneless organelle contractile muscle fiber cytoplasm supramolecular fiber cell projection cellular anatomical structure cell leading edge plasma membrane bounded cell projection lamellipodium intracellular anatomical structure intracellular membraneless organelle sarcomere intracellular organelle organelle membraneless organelle contractile muscle fiber cytoplasm supramolecular fiber myofibril supramolecular polymer supramolecular complex cytoskeleton actin cytoskeleton cytosol polymeric cytoskeletal fiber actin filament cell body actin-based cell projection filopodium

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
O	IPR001978	Troponin	Family
O	IPR050875	Troponin I	Family
O	IPR021666	Troponin I residues 1-32	Family
O	IPR038077	Troponin domain superfamily	Homologous Superfamily
N	IPR050230	Calmodulin/Myosin light chain/Troponin C-like	Family
N	IPR018247	EF-Hand 1, calcium-binding site	Binding Site
N	IPR002048	EF-hand domain	Domain
N	IPR011992	EF-hand domain pair	Homologous Superfamily
L, M	IPR050230	Calmodulin/Myosin light chain/Troponin C-like	Family
L, M	IPR002048	EF-hand domain	Domain
L, M	IPR011992	EF-hand domain pair	Homologous Superfamily
J, K	IPR036961	Kinesin motor domain superfamily	Homologous Superfamily
J, K	IPR004009	Myosin, SH3 domain	Domain
J, K	IPR014751	DNA repair protein XRCC4-like, C-terminal	Homologous Superfamily
J, K	IPR001609	Myosin head, motor domain-like	Domain
J, K	IPR002928	Myosin tail	Domain
J, K	IPR008989	Myosin S1 fragment, N-terminal	Homologous Superfamily
J, K	IPR027417	P-loop containing nucleoside triphosphate hydrolase	Homologous Superfamily
I, P	IPR027707	Troponin T	Family
I, P	IPR001978	Troponin	Family
I, P	IPR038077	Troponin domain superfamily	Homologous Superfamily
E, F, G, H	IPR000533	Tropomyosin	Family
A, B, C, D	IPR020902	Actin/actin-like conserved site	Conserved Site
A, B, C, D	IPR004001	Actin, conserved site	Conserved Site
A, B, C, D	IPR043129	ATPase, nucleotide binding domain	Homologous Superfamily
A, B, C, D	IPR004000	Actin family	Family

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RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.

9YAQ | pdb_00009yaq

The structure of the cardiac native cross bridge in the rigor state, myosin heads bound to actin molecules 5 and 6.

External Resource: Annotation

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Protein Family Annotation Pfam Database Homepage

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

InterPro: Protein Family Classification InterPro Database Homepage