Annotations: 4I1K

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	PF02362	e4i1kA1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: Type II restriction endonuclease effector domain	F: PF02362	ECOD (1.6)
B	PF02362	e4i1kB2	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: Type II restriction endonuclease effector domain	F: PF02362	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	2.40.330.10	Mainly Beta	Beta Barrel	At1g16640 B3 domain	DNA-binding pseudobarrel domain	CATH (4.3.0)
B	2.40.330.10	Mainly Beta	Beta Barrel	At1g16640 B3 domain	DNA-binding pseudobarrel domain	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF02362	B3 DNA binding domain (B3)	B3 DNA binding domain	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	B3 domain-containing transcription factor VRN1	DNA binding binding organic cyclic compound binding nucleic acid binding sequence-specific DNA binding sequence-specific double-stranded DNA binding transcription cis-regulatory region binding double-stranded DNA binding transcription regulatory region nucleic acid binding	response to stimulus vernalization response response to stress response to abiotic stimulus response to cold response to temperature stimulus developmental process multicellular organismal process regulation of biological process regulation of multicellular organismal development reproductive system development regulation of developmental process regulation of reproductive process reproductive process response to stimulus vernalization response response to stress response to abiotic stimulus response to cold response to temperature stimulus developmental process multicellular organismal process regulation of biological process regulation of multicellular organismal development reproductive system development regulation of developmental process regulation of reproductive process reproductive process biological regulation regulation of shoot system development flower development developmental process involved in reproduction reproductive shoot system development multicellular organism development regulation of post-embryonic development anatomical structure development reproductive structure development shoot system development post-embryonic development regulation of multicellular organismal process regulation of flower development system development	membrane-bounded organelle intracellular anatomical structure nucleus membrane-enclosed lumen intracellular membrane-bounded organelle cellular anatomical entity intracellular organelle lumen intracellular organelle nucleoplasm organelle lumen organelle nuclear lumen

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR015300	DNA-binding pseudobarrel domain superfamily	Homologous Superfamily
A, B	IPR003340	B3 DNA binding domain	Domain

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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 R01GM133198.