Annotations: 8EQB

FAM46C/BCCIPalpha/Nanobody complex

External Resource: Annotation

Domain Annotation: ECOD Classification
SAbDab Antibody Annotation
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	Ion_trans	e8eqbA1	A: alpha arrays	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel	F: Ion_trans	ECOD (v295)
D	Ion_trans	e8eqbD1	A: alpha arrays	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel	F: Ion_trans	ECOD (v295)
G	Ion_trans	e8eqbG1	A: alpha arrays	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel	F: Ion_trans	ECOD (v295)
J	Ion_trans	e8eqbJ1	A: alpha arrays	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel	F: Ion_trans	ECOD (v295)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
A, D, G, J	Heavy Chain	IGHV1	-	isoform 2 of brca2 and cdkn1a-interacting protein \| terminal nucleotidyltransferase 5c	SAbDab (2026-07-17)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
B, E, H, K	PF07984	Nucleotidyltransferase (NTP_transf_7)	Nucleotidyltransferase	This family contains many hypothetical proteins. It also includes four nematode prion-like proteins. This domain has been identified as part of the nucleotidyltransferase superfamily [1].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, D, G, J	Synthetic nanobody 1	-	-	-
B, E, H, K	Terminal nucleotidyltransferase 5C	poly(A) RNA polymerase activity adenylyltransferase activity transferase activity nucleotidyltransferase activity catalytic activity transferase activity, transferring phosphorus-containing groups RNA binding binding nucleic acid binding	developmental process regulation of biological process regulation of cellular process regulation of developmental process cellular developmental process negative regulation of developmental process biological regulation negative regulation of biological process regulation of cell differentiation cell differentiation negative regulation of cellular process negative regulation of cell differentiation cellular process positive regulation of macromolecule biosynthetic process developmental process regulation of biological process regulation of cellular process regulation of developmental process cellular developmental process negative regulation of developmental process biological regulation negative regulation of biological process regulation of cell differentiation cell differentiation negative regulation of cellular process negative regulation of cell differentiation cellular process positive regulation of macromolecule biosynthetic process regulation of primary metabolic process nucleobase-containing compound metabolic process positive regulation of metabolic process post-transcriptional regulation of gene expression regulation of RNA metabolic process negative regulation of nucleobase-containing compound metabolic process positive regulation of macromolecule metabolic process regulation of nucleobase-containing compound metabolic process regulation of biological quality RNA catabolic process mRNA stabilization mRNA catabolic process negative regulation of metabolic process primary metabolic process nucleobase-containing compound catabolic process regulation of gene expression negative regulation of gene expression biosynthetic process negative regulation of macromolecule biosynthetic process nucleic acid catabolic process metabolic process regulation of macromolecule biosynthetic process macromolecule metabolic process regulation of metabolic process negative regulation of RNA metabolic process catabolic process positive regulation of biological process RNA metabolic process macromolecule catabolic process negative regulation of mRNA metabolic process regulation of mRNA catabolic process positive regulation of biosynthetic process positive regulation of cellular process negative regulation of macromolecule metabolic process regulation of biosynthetic process negative regulation of catabolic process negative regulation of mRNA catabolic process negative regulation of RNA catabolic process regulation of macromolecule metabolic process regulation of catabolic process gene expression mRNA metabolic process macromolecule biosynthetic process nucleic acid metabolic process regulation of mRNA stability RNA stabilization negative regulation of biosynthetic process positive regulation of gene expression regulation of RNA stability regulation of mRNA metabolic process	cellular anatomical structure intracellular anatomical structure cytoplasm membrane-bounded organelle nucleus membrane-enclosed lumen intracellular membrane-bounded organelle intracellular organelle lumen intracellular organelle nucleoplasm organelle lumen organelle nuclear lumen centrosome cellular anatomical structure intracellular anatomical structure cytoplasm membrane-bounded organelle nucleus membrane-enclosed lumen intracellular membrane-bounded organelle intracellular organelle lumen intracellular organelle nucleoplasm organelle lumen organelle nuclear lumen centrosome microtubule organizing center cytoskeleton membraneless organelle intracellular membraneless organelle microtubule cytoskeleton
C, F, I, L	Isoform 2 of BRCA2 and CDKN1A-interacting protein	DNA binding binding nucleic acid binding enzyme regulator activity molecular function regulator activity kinase regulator activity cytoskeletal protein binding protein binding tubulin binding RNA binding identical protein binding	establishment of organelle localization cellular localization microtubule cytoskeleton organization spindle localization establishment or maintenance of cell polarity mitotic cell cycle cellular component organization localization establishment of mitotic spindle localization establishment of spindle localization establishment of spindle orientation organelle localization establishment of localization in cell cell cycle establishment of organelle localization cellular localization microtubule cytoskeleton organization spindle localization establishment or maintenance of cell polarity mitotic cell cycle cellular component organization localization establishment of mitotic spindle localization establishment of spindle localization establishment of spindle orientation organelle localization establishment of localization in cell cell cycle cellular component organization or biogenesis microtubule cytoskeleton organization involved in mitosis cell cycle process establishment of localization establishment of cell polarity organelle organization mitotic cell cycle process establishment of mitotic spindle orientation cellular process microtubule-based process cytoskeleton organization cellular response to stimulus response to stimulus primary metabolic process DNA metabolic process nucleic acid metabolic process nucleobase-containing compound metabolic process cellular response to stress DNA damage response response to stress metabolic process macromolecule metabolic process DNA repair membraneless organelle assembly cellular component biogenesis cellular component assembly mitotic sister chromatid segregation chromosome segregation spindle organization mitotic nuclear division organelle assembly organelle fission chromosome organization sister chromatid segregation spindle assembly mitotic spindle organization mitotic spindle assembly nuclear division nuclear chromosome segregation developmental process multicellular organismal process epithelium development neuroendocrine cell differentiation cellular developmental process nervous system development tissue development epithelial cell differentiation generation of neurons neurogenesis multicellular organism development neuron differentiation cell differentiation anatomical structure development neuroepithelial cell differentiation columnar/cuboidal epithelial cell differentiation animal gross anatomical part developmental process system development regulation of cellular process regulation of protein modification process regulation of catalytic activity regulation of protein phosphorylation regulation of transferase activity regulation of primary metabolic process regulation of cyclin-dependent protein serine/threonine kinase activity phosphate-containing compound metabolic process protein metabolic process protein modification process regulation of biological process protein phosphorylation phosphorylation regulation of protein metabolic process biological regulation regulation of protein kinase activity regulation of macromolecule metabolic process regulation of molecular function regulation of kinase activity regulation of protein serine/threonine kinase activity macromolecule modification regulation of phosphorylation regulation of metabolic process microtubule anchoring	intracellular organelle centrosome microtubule organizing center cellular anatomical structure intracellular anatomical structure cytoskeleton organelle membraneless organelle intracellular membraneless organelle microtubule cytoskeleton centriole mitotic spindle spindle mitotic spindle pole intracellular organelle centrosome microtubule organizing center cellular anatomical structure intracellular anatomical structure cytoskeleton organelle membraneless organelle intracellular membraneless organelle microtubule cytoskeleton centriole mitotic spindle spindle mitotic spindle pole spindle pole membrane-bounded organelle protein-containing complex catalytic complex nucleus cyclin-dependent protein kinase holoenzyme complex nuclear protein-containing complex intracellular membrane-bounded organelle transferase complex protein kinase complex transferase complex, transferring phosphorus-containing groups serine/threonine protein kinase complex nuclear cyclin-dependent protein kinase holoenzyme complex membrane-enclosed lumen intracellular organelle lumen nucleoplasm organelle lumen nuclear lumen

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
B, E, H, K	IPR012937	Terminal nucleotidyltransferase	Family
C, F, I, L	IPR025602	BCP1 family	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
B, E, H, K	: Q5VWP2	B-cell chronic lymphocytic leukemia interstitial cystitis malignant pancreatic neoplasm ovarian cancer periodontitis tuberculosis breast cancer lung cancer MALT lymphoma pancreatic ductal adenocarcinoma sinusitis ulcerative colitis Crohn disease malignant colon neoplasm osteosarcoma B-cell chronic lymphocytic leukemia interstitial cystitis malignant pancreatic neoplasm ovarian cancer periodontitis tuberculosis breast cancer lung cancer MALT lymphoma pancreatic ductal adenocarcinoma sinusitis ulcerative colitis Crohn disease malignant colon neoplasm osteosarcoma pancreatic intraductal papillary-mucinous neoplasm spina bifida
C, F, I, L	: Q9P287	adrenal cortex carcinoma medulloblastoma subependymal giant cell astrocytoma juvenile dermatomyositis osteosarcoma lung cancer ovarian cancer

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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. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.