Annotations: 3C2H

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	Arm	e3c2hA1	A: alpha superhelices	X: Repetitive alpha hairpins	H: ARM repeat (From Topology)	T: ARM repeat	F: Arm	ECOD (1.6)
B	Arm	e3c2hB1	A: alpha superhelices	X: Repetitive alpha hairpins	H: ARM repeat (From Topology)	T: ARM repeat	F: Arm	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.25.10.10	Mainly Alpha	Alpha Horseshoe	Leucine-rich Repeat Variant	Leucine-rich Repeat Variant	CATH (4.3.0)
A	1.10.10.1630	Mainly Alpha	Orthogonal Bundle	Arc Repressor Mutant, subunit A	Sys-1 C-terminal domain-like	CATH (4.3.0)
B	1.25.10.10	Mainly Alpha	Alpha Horseshoe	Leucine-rich Repeat Variant	Leucine-rich Repeat Variant	CATH (4.3.0)
B	1.10.10.1630	Mainly Alpha	Orthogonal Bundle	Arc Repressor Mutant, subunit A	Sys-1 C-terminal domain-like	CATH (4.3.0)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	Sys-1 protein	transcription factor binding RNA polymerase II-specific DNA-binding transcription factor binding protein binding binding DNA-binding transcription factor binding transcription coactivator activity transcription regulator activity transcription coregulator activity protein-macromolecule adaptor activity molecular adaptor activity scaffold protein binding	developmental process multicellular organismal process gonad development reproductive system development reproductive process sex differentiation animal organ development developmental process involved in reproduction male gonad development male sex differentiation multicellular organism development development of primary male sexual characteristics development of primary sexual characteristics anatomical structure development reproductive structure development developmental process multicellular organismal process gonad development reproductive system development reproductive process sex differentiation animal organ development developmental process involved in reproduction male gonad development male sex differentiation multicellular organism development development of primary male sexual characteristics development of primary sexual characteristics anatomical structure development reproductive structure development system development regulation of cellular process cellular biosynthetic process negative regulation of biological process RNA metabolic process negative regulation of cellular metabolic process regulation of primary metabolic process negative regulation of RNA biosynthetic process RNA biosynthetic process nucleobase-containing compound metabolic process DNA-templated transcription nucleic acid biosynthetic process regulation of RNA metabolic process negative regulation of cellular process negative regulation of nucleobase-containing compound metabolic process regulation of nucleobase-containing compound metabolic process regulation of RNA biosynthetic process negative regulation of macromolecule metabolic process regulation of biosynthetic process negative regulation of DNA-templated transcription regulation of biological process cellular metabolic process negative regulation of metabolic process biological regulation 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 negative regulation of cellular biosynthetic process regulation of cellular biosynthetic process regulation of gene expression biosynthetic process negative regulation of biosynthetic process negative regulation of macromolecule biosynthetic process metabolic process cellular process regulation of macromolecule biosynthetic process macromolecule metabolic process regulation of DNA-templated transcription regulation of metabolic process negative regulation of RNA metabolic 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 positive regulation of gene expression positive regulation of cellular biosynthetic process digestive system development tube development embryo development digestive tract development embryonic organ development embryonic digestive tract development mesodermal cell differentiation regulation of developmental process cellular developmental process mesoderm morphogenesis regulation of cell differentiation regulation of mesodermal cell fate specification positive regulation of developmental process regulation of mesodermal cell differentiation positive regulation of mesodermal cell fate specification positive regulation of cell differentiation cell differentiation mesodermal cell fate commitment positive regulation of cell fate specification animal organ morphogenesis mesoderm formation positive regulation of cell fate commitment positive regulation of mesodermal cell differentiation regulation of anatomical structure morphogenesis mesoderm development mesodermal cell fate specification formation of primary germ layer regulation of animal organ morphogenesis regulation of cell fate commitment embryonic morphogenesis cell fate specification tissue development gastrulation tissue morphogenesis anatomical structure morphogenesis cell fate commitment involved in formation of primary germ layer regulation of cell fate specification anatomical structure formation involved in morphogenesis cell fate commitment regulation of asymmetric cell division cell division asymmetric cell division regulation of cell division cellular response to stimulus cell surface receptor signaling pathway response to stimulus signaling cell communication signal transduction Wnt signaling pathway negative regulation of gene expression embryo development ending in birth or egg hatching endoderm development endoderm formation endodermal cell fate commitment endodermal cell differentiation positive regulation of DNA-templated transcription transcription by RNA polymerase II regulation of transcription by RNA polymerase II positive regulation of nucleobase-containing compound metabolic process positive regulation of transcription by RNA polymerase II positive regulation of RNA metabolic process positive regulation of RNA biosynthetic process gonad morphogenesis specification of axis polarity polarity specification of proximal/distal axis pattern specification process regionalization proximal/distal axis specification axis specification proximal/distal pattern formation female gonad development female sex differentiation development of primary female sexual characteristics	cell periphery cell cortex intracellular anatomical structure cytoplasm cellular anatomical entity intracellular organelle centrosome microtubule organizing center cytoskeleton organelle intracellular non-membrane-bounded organelle microtubule cytoskeleton non-membrane-bounded organelle chromosome cell periphery cell cortex intracellular anatomical structure cytoplasm cellular anatomical entity intracellular organelle centrosome microtubule organizing center cytoskeleton organelle intracellular non-membrane-bounded organelle microtubule cytoskeleton non-membrane-bounded organelle chromosome chromosomal region kinetochore chromosome, centromeric region condensed chromosome, centromeric region supramolecular complex condensed chromosome membrane-bounded organelle nucleus intracellular membrane-bounded organelle

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR016024	Armadillo-type fold	Homologous Superfamily
A, B	IPR011989	Armadillo-like helical	Homologous Superfamily

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.