Annotations: 2V51

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A [auth B]	SCOP2B Superfamily	Actin-like ATPases	8040506	3000092	SCOP2B (2022-06-29)
A [auth B]	SCOP2B Superfamily	Actin-like ATPases	8040509	3000092	SCOP2B (2022-06-29)
B [auth D]	SCOP2B Superfamily	Actin-like ATPases	8040506	3000092	SCOP2B (2022-06-29)
B [auth D]	SCOP2B Superfamily	Actin-like ATPases	8040509	3000092	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A [auth B]	Actin_1st	e2v51B3	A: mixed a+b and a/b	X: Ribonuclease H-like	H: Ribonuclease H-like (From Topology)	T: Ribonuclease H-like	F: Actin_1st	ECOD (1.6)
A [auth B]	Actin_2nd	e2v51B4	A: mixed a+b and a/b	X: Ribonuclease H-like	H: Ribonuclease H-like (From Topology)	T: Ribonuclease H-like	F: Actin_2nd	ECOD (1.6)
B [auth D]	Actin_1st	e2v51D3	A: mixed a+b and a/b	X: Ribonuclease H-like	H: Ribonuclease H-like (From Topology)	T: Ribonuclease H-like	F: Actin_1st	ECOD (1.6)
B [auth D]	Actin_2nd	e2v51D4	A: mixed a+b and a/b	X: Ribonuclease H-like	H: Ribonuclease H-like (From Topology)	T: Ribonuclease H-like	F: Actin_2nd	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A [auth B]	3.30.420.40	Alpha Beta	2-Layer Sandwich	Nucleotidyltransferase	domain 5	CATH (4.3.0)
A [auth B]	3.90.640.10	Alpha Beta	Alpha-Beta Complex	Actin	Chain A, domain 4	CATH (4.3.0)
B [auth D]	3.30.420.40	Alpha Beta	2-Layer Sandwich	Nucleotidyltransferase	domain 5	CATH (4.3.0)
B [auth D]	3.90.640.10	Alpha Beta	Alpha-Beta Complex	Actin	Chain A, domain 4	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
C [auth E], D [auth F]	PF02755	RPEL repeat (RPEL)	RPEL repeat	-	Disordered

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A [auth B], B [auth D]	ACTIN, ALPHA SKELETAL MUSCLE	cytoskeletal protein binding titin binding protein binding binding cation binding ion binding calcium ion binding metal ion binding small molecule binding protein domain specific binding hydrolase activity catalytic activity troponin I binding cytoskeletal motor activator activity cytoskeletal protein binding titin binding protein binding binding cation binding ion binding calcium ion binding metal ion binding small molecule binding protein domain specific binding hydrolase activity catalytic activity troponin I binding cytoskeletal motor activator activity cytoskeletal motor regulator activity molecular function activator activity molecular function regulator activity magnesium ion binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding purine nucleotide binding organic cyclic compound binding anion binding adenyl nucleotide binding ATP binding heterocyclic compound binding carbohydrate derivative binding ribonucleotide binding myosin heavy chain binding myosin binding tropomyosin binding calcium-dependent protein binding identical protein binding actin monomer binding actin binding	developmental process mesenchyme migration multicellular organismal process mesenchyme morphogenesis animal organ development mesenchyme development tissue development tissue morphogenesis anatomical structure morphogenesis tissue migration anatomical structure development animal organ morphogenesis myotube cell development skeletal muscle fiber development developmental process mesenchyme migration multicellular organismal process mesenchyme morphogenesis animal organ development mesenchyme development tissue development tissue morphogenesis anatomical structure morphogenesis tissue migration anatomical structure development animal organ morphogenesis myotube cell development skeletal muscle fiber development cellular developmental process skeletal muscle tissue development cell development muscle cell differentiation myotube differentiation striated muscle tissue development muscle structure development skeletal muscle organ development striated muscle cell development muscle cell development cell differentiation cellular process muscle tissue development muscle organ development striated muscle cell differentiation regulation of cellular process cellular biosynthetic process positive regulation of biological process positive regulation of cellular metabolic process positive regulation of macromolecule biosynthetic process positive regulation of metabolic process positive regulation of biosynthetic process positive regulation of macromolecule metabolic process positive regulation of cellular process regulation of biosynthetic process regulation of biological process cellular metabolic process biological regulation regulation of cellular metabolic process regulation of macromolecule metabolic process gene expression macromolecule biosynthetic process regulation of cellular biosynthetic process regulation of gene expression biosynthetic process positive regulation of gene expression regulation of macromolecule biosynthetic process metabolic process macromolecule metabolic process regulation of metabolic process positive regulation of cellular biosynthetic process cellular component assembly involved in morphogenesis non-membrane-bounded organelle assembly skeletal myofibril assembly cellular component organization cellular component biogenesis cellular anatomical entity morphogenesis cellular component assembly actin filament-based process cellular component organization or biogenesis skeletal muscle thin filament assembly actin cytoskeleton organization actomyosin structure organization organelle assembly actin filament organization organelle organization myofibril assembly anatomical structure formation involved in morphogenesis supramolecular fiber organization cytoskeleton organization protein polymerization actin polymerization or depolymerization actin filament polymerization protein-containing complex organization protein-containing complex assembly actin filament bundle organization actin filament bundle assembly	intracellular anatomical structure skeletal muscle myofibril cellular anatomical entity intracellular organelle organelle intracellular non-membrane-bounded organelle contractile muscle fiber cytoplasm supramolecular fiber myofibril supramolecular polymer supramolecular complex non-membrane-bounded organelle cell projection intracellular anatomical structure skeletal muscle myofibril cellular anatomical entity intracellular organelle organelle intracellular non-membrane-bounded organelle contractile muscle fiber cytoplasm supramolecular fiber myofibril supramolecular polymer supramolecular complex non-membrane-bounded organelle cell projection cell leading edge plasma membrane bounded cell projection lamellipodium cytoskeleton actin filament bundle actin cytoskeleton actomyosin stress fiber contractile actin filament bundle polymeric cytoskeletal fiber actin filament protein-containing complex filamentous actin cell body striated muscle thin filament myofilament sarcomere actin-based cell projection filopodium
C [auth E], D [auth F]	MKL/MYOCARDIN-LIKE PROTEIN 1	DNA binding sequence-specific DNA binding sequence-specific double-stranded DNA binding transcription cis-regulatory region binding binding double-stranded DNA binding organic cyclic compound binding nucleic acid binding transcription regulatory region nucleic acid binding cytoskeletal protein binding actin binding protein binding transcription coactivator activity transcription regulator activity DNA binding sequence-specific DNA binding sequence-specific double-stranded DNA binding transcription cis-regulatory region binding binding double-stranded DNA binding organic cyclic compound binding nucleic acid binding transcription regulatory region nucleic acid binding cytoskeletal protein binding actin binding protein binding transcription coactivator activity transcription regulator activity transcription coregulator activity protein-macromolecule adaptor activity molecular adaptor activity DNA-binding transcription factor activity actin monomer binding	cellular response to stimulus regulation of cellular process response to stimulus negative regulation of signaling signaling negative regulation of biological process regulation of signal transduction regulation of programmed cell death negative regulation of cell communication cell communication negative regulation of apoptotic signaling pathway negative regulation of cellular process signal transduction regulation of signaling cellular response to stimulus regulation of cellular process response to stimulus negative regulation of signaling signaling negative regulation of biological process regulation of signal transduction regulation of programmed cell death negative regulation of cell communication cell communication negative regulation of apoptotic signaling pathway negative regulation of cellular process signal transduction regulation of signaling regulation of biological process negative regulation of response to stimulus negative regulation of programmed cell death regulation of apoptotic process biological regulation cell death negative regulation of signal transduction apoptotic signaling pathway negative regulation of apoptotic process regulation of response to stimulus regulation of cell communication cellular process apoptotic process programmed cell death regulation of apoptotic signaling pathway developmental process multicellular organismal process head development forebrain development animal organ development brain development nervous system development multicellular organism development central nervous system development anatomical structure development system development muscle structure development smooth muscle cell differentiation cellular developmental process cell differentiation muscle cell differentiation positive regulation of DNA-templated transcription cellular biosynthetic process positive regulation of biological process RNA metabolic process positive regulation of cellular metabolic process positive regulation of macromolecule biosynthetic process regulation of primary metabolic process nucleobase-containing compound metabolic process RNA biosynthetic process nucleic acid biosynthetic process positive regulation of metabolic process DNA-templated transcription regulation of RNA metabolic process positive regulation of biosynthetic process positive regulation of macromolecule metabolic process regulation of nucleobase-containing compound metabolic process positive regulation of cellular process regulation of RNA biosynthetic process regulation of biosynthetic process positive regulation of nucleobase-containing compound metabolic process cellular metabolic process primary metabolic process regulation of cellular metabolic process regulation of macromolecule metabolic process nucleobase-containing compound biosynthetic process gene expression macromolecule biosynthetic process nucleic acid metabolic process regulation of cellular biosynthetic process positive regulation of RNA metabolic process regulation of gene expression biosynthetic process positive regulation of RNA biosynthetic process metabolic process regulation of macromolecule biosynthetic process macromolecule metabolic process regulation of DNA-templated transcription regulation of metabolic process positive regulation of cellular biosynthetic process neuron migration generation of neurons neurogenesis cell migration cell motility transcription by RNA polymerase II regulation of transcription by RNA polymerase II cellular component organization organelle organization actin cytoskeleton organization actin filament-based process cellular component organization or biogenesis cytoskeleton organization positive regulation of transcription by RNA polymerase II plasma membrane bounded cell projection organization cell projection organization cell development neuron projection development neuron differentiation neuron development	intracellular anatomical structure cytoplasm cellular anatomical entity membrane-bounded organelle intracellular organelle organelle nucleus intracellular membrane-bounded organelle

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A [auth B], B [auth D]	IPR020902	Actin/actin-like conserved site	Conserved Site
A [auth B], B [auth D]	IPR043129	ATPase, nucleotide binding domain	Homologous Superfamily
A [auth B], B [auth D]	IPR004001	Actin, conserved site	Conserved Site
A [auth B], B [auth D]	IPR004000	Actin family	Family
C [auth E], D [auth F]	IPR004018	RPEL repeat	Repeat
C [auth E], D [auth F]	IPR003034	SAP domain	Domain
C [auth E], D [auth F]	IPR036361	SAP domain superfamily	Homologous Superfamily
C [auth E], D [auth F]	IPR043451	Myocardin-like	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.