Annotations: 3HL4

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B	CTP_transf_like_1	e3hl4B1	A: a/b three-layered sandwiches	X: HUP domain-like	H: HUP domains (From Topology)	T: HUP domains	F: CTP_transf_like_1	ECOD (1.6)
A	CTP_transf_like_1	e3hl4A1	A: a/b three-layered sandwiches	X: HUP domain-like	H: HUP domains (From Topology)	T: HUP domains	F: CTP_transf_like_1	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B	3.40.50.620	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	HUPs	CATH (4.3.0)
A	3.40.50.620	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	HUPs	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF01467	Cytidylyltransferase-like (CTP_transf_like)	Cytidylyltransferase-like	This family includes: Cholinephosphate cytidylyltransferase Swiss:P49585; glycerol-3-phosphate cytidylyltransferase Swiss:P27623. It also includes putative adenylyltransferases, and FAD synthases.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	Choline-phosphate cytidylyltransferase A	identical protein binding protein binding binding protein homodimerization activity protein dimerization activity lipid binding molecular function inhibitor activity molecular function regulator activity calmodulin binding cytidylyltransferase activity choline-phosphate cytidylyltransferase activity transferase activity nucleotidyltransferase activity catalytic activity identical protein binding protein binding binding protein homodimerization activity protein dimerization activity lipid binding molecular function inhibitor activity molecular function regulator activity calmodulin binding cytidylyltransferase activity choline-phosphate cytidylyltransferase activity transferase activity nucleotidyltransferase activity catalytic activity transferase activity, transferring phosphorus-containing groups cation binding ion binding phosphatidylcholine binding phospholipid binding quaternary ammonium group binding small molecule binding	multicellular organismal process cell population proliferation B cell activation cell activation B cell proliferation lymphocyte activation leukocyte proliferation leukocyte activation immune system process mononuclear cell proliferation lymphocyte proliferation cellular process glycerophospholipid biosynthetic process cellular biosynthetic process multicellular organismal process cell population proliferation B cell activation cell activation B cell proliferation lymphocyte activation leukocyte proliferation leukocyte activation immune system process mononuclear cell proliferation lymphocyte proliferation cellular process glycerophospholipid biosynthetic process cellular biosynthetic process cellular metabolic process glycerophospholipid metabolic process lipid biosynthetic process primary metabolic process phospholipid biosynthetic process phospholipid metabolic process biosynthetic process glycerolipid biosynthetic process organophosphate metabolic process organophosphate biosynthetic process cellular lipid metabolic process phosphate-containing compound metabolic process phosphatidylcholine metabolic process glycerolipid metabolic process metabolic process phosphatidylcholine biosynthetic process phosphorus metabolic process lipid metabolic process CDP-choline pathway adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains lymphocyte mediated immunity response to stimulus B cell activation involved in immune response cell activation involved in immune response nucleobase-containing compound metabolic process multicellular organism development anatomical structure development leukocyte mediated immunity somatic diversification of immune receptors somatic recombination of immunoglobulin genes involved in immune response system development developmental process immune response DNA recombination DNA metabolic process immune effector process somatic diversification of immunoglobulins B cell mediated immunity macromolecule metabolic process isotype switching immune system development immunoglobulin production immunoglobulin production involved in immunoglobulin-mediated immune response somatic cell DNA recombination somatic diversification of immunoglobulins involved in immune response somatic recombination of immunoglobulin gene segments leukocyte activation involved in immune response lymphocyte activation involved in immune response production of molecular mediator of immune response gene expression macromolecule biosynthetic process immunoglobulin mediated immune response adaptive immune response nucleic acid metabolic process somatic diversification of immune receptors via germline recombination within a single locus	glycogen granule intracellular anatomical structure cytoplasm cellular anatomical entity membrane-bounded organelle intracellular organelle organelle envelope organelle nuclear envelope nucleus intracellular membrane-bounded organelle endomembrane system cytosol membrane glycogen granule intracellular anatomical structure cytoplasm cellular anatomical entity membrane-bounded organelle intracellular organelle organelle envelope organelle nuclear envelope nucleus intracellular membrane-bounded organelle endomembrane system cytosol membrane extrinsic component of membrane endoplasmic reticulum organelle subcompartment endoplasmic reticulum subcompartment nuclear outer membrane-endoplasmic reticulum membrane network organelle membrane endoplasmic reticulum membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR041723	CTP:phosphocholine cytidylyltransferase domain	Domain
A, B	IPR004821	Cytidyltransferase-like domain	Domain
A, B	IPR014729	Rossmann-like alpha/beta/alpha sandwich fold	Homologous Superfamily
A, B	IPR045049	Choline-phosphate cytidylyltransferase Pcy1-like	Family

Membrane Protein Annotation: OPM OPM Database Homepage

Chains	External Link	Type	Class	Superfamily	Family
A, B	OPM	Monotopic/peripheral	Alpha/Beta monotopic/peripheral	Flavokinase-like nucleotidyl transferase	Cytidylyltransferase

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.