8V0I

The structure of the native cardiac thin filament troponin core in Ca2+-bound fully activated state 2 from the lower strand

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)
C	SCOP2B Superfamily	EF-hand	8104309	3001983	SCOP2B (2022-06-29)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF00022	Actin (Actin)	Actin	-	Family
C	PF13833	EF-hand domain pair (EF-hand_8)	EF-hand domain pair	-	Domain
C	PF13499	EF-hand domain pair (EF-hand_7)	EF-hand domain pair	-	Domain
D	PF00992	Troponin (Troponin)	Troponin	-	Family
E	PF00992	Troponin (Troponin)	Troponin	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	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 organic cyclic compound binding anion binding adenyl nucleotide binding ATP binding heterocyclic compound binding carbohydrate derivative binding binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding organic cyclic compound 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 cytoskeletal motor activity microfilament motor activity ATP-dependent 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 heart development cardiac muscle tissue development 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 heart development cardiac muscle tissue development heart morphogenesis animal organ development tissue development muscle tissue morphogenesis striated muscle tissue development circulatory system development muscle structure development multicellular organism development anatomical structure morphogenesis tissue morphogenesis anatomical structure development cardiac muscle tissue morphogenesis animal organ morphogenesis muscle organ development muscle tissue development muscle organ morphogenesis system development regulation of biological process regulation of cellular process negative regulation of programmed cell death regulation of apoptotic process biological regulation negative regulation of biological process regulation of programmed cell death cell death negative regulation of apoptotic process negative regulation of cellular process apoptotic process programmed cell death cellular developmental process cardiac muscle cell development cellular component assembly involved in morphogenesis cell development membraneless organelle assembly muscle cell differentiation cellular component organization cellular component biogenesis striated muscle cell development cellular anatomical entity morphogenesis cellular component assembly muscle cell development cell differentiation cellular component organization or biogenesis cardiac cell development actomyosin structure organization actin cytoskeleton organization organelle assembly cardiac muscle cell differentiation cardiocyte differentiation myofibril assembly organelle organization cardiac myofibril assembly anatomical structure formation involved in morphogenesis striated muscle cell differentiation supramolecular fiber organization cytoskeleton organization skeletal myofibril assembly skeletal muscle thin filament assembly actin filament organization	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 sarcomere 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 sarcomere I band contractile muscle fiber cytoplasm myofibril synapse cell junction glutamatergic synapse
C	Troponin C, slow skeletal and cardiac muscles	cation binding ion binding binding calcium ion binding metal ion binding small molecule binding calcium-dependent protein binding protein binding cytoskeletal protein binding troponin I binding	multicellular organismal movement musculoskeletal movement multicellular organismal process system process nervous system process neuromuscular process skeletal muscle contraction muscle contraction muscle system process striated muscle contraction heart process circulatory system process cardiac muscle contraction heart contraction multicellular organismal movement musculoskeletal movement multicellular organismal process system process nervous system process neuromuscular process skeletal muscle contraction muscle contraction muscle system process striated muscle contraction heart process circulatory system process cardiac muscle contraction heart contraction blood circulation	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
D	Troponin I, cardiac muscle	cytoskeletal protein binding actin binding protein binding binding	multicellular organismal movement musculoskeletal movement multicellular organismal process system process nervous system process neuromuscular process skeletal muscle contraction muscle contraction muscle system process striated muscle contraction heart process circulatory system process cardiac muscle contraction heart contraction multicellular organismal movement musculoskeletal movement multicellular organismal process system process nervous system process neuromuscular process skeletal muscle contraction muscle contraction muscle system process striated muscle contraction heart process circulatory system process cardiac muscle contraction heart contraction blood circulation	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	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
F, G	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 cytoplasm

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR020902	Actin/actin-like conserved site	Conserved Site
A, B	IPR004001	Actin, conserved site	Conserved Site
A, B	IPR043129	ATPase, nucleotide binding domain	Homologous Superfamily
A, B	IPR004000	Actin family	Family
C	IPR050230	Calmodulin/Myosin light chain/Troponin C-like	Family
C	IPR018247	EF-Hand 1, calcium-binding site	Binding Site
C	IPR002048	EF-hand domain	Domain
C	IPR011992	EF-hand domain pair	Homologous Superfamily
D	IPR001978	Troponin	Family
D	IPR050875	Troponin I	Family
D	IPR021666	Troponin I residues 1-32	Family
D	IPR038077	Troponin domain superfamily	Homologous Superfamily
E	IPR027707	Troponin T	Family
E	IPR001978	Troponin	Family
E	IPR038077	Troponin domain superfamily	Homologous Superfamily
F, G	IPR000533	Tropomyosin	Family

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.