Annotations: 1IBX

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1ibxa1	Alpha and beta proteins (a+b)	beta-Grasp (ubiquitin-like)	CAD & PB1 domains	CAD domain	Caspase-activated DNase (CAD), DFF40, N-terminal domain	human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
A	d1ibxa2	Artifacts	Tags	Tags	Tags	C-terminal Tags	human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
B	d1ibxb_	Alpha and beta proteins (a+b)	beta-Grasp (ubiquitin-like)	CAD & PB1 domains	CAD domain	Inhibitor of caspase-activated DNase (ICAD), DFF45, N-terminal domain	(Streptococcus sp. ) [TaxId: 1306 ], human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2 Family	CAD domain	8021500	4000979	SCOP2 (2021-05-27)
A	SCOP2 Superfamily	CAD & PB1 domains	8033880	3000318	SCOP2 (2021-05-27)
B	SCOP2 Family	CAD domain	8021501	4000979	SCOP2 (2021-05-27)
B	SCOP2 Superfamily	CAD & PB1 domains	8033881	3000318	SCOP2 (2021-05-27)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	PF02017	e1ibxA1	A: a+b two layers	X: beta-Grasp	H: Ubiquitin-related	T: Ubiquitin-like	F: PF02017	ECOD (1.6)
B	PF02017	e1ibxB1	A: a+b two layers	X: beta-Grasp	H: Ubiquitin-related	T: Ubiquitin-like	F: PF02017	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.10.20.10	Alpha Beta	Roll	Ubiquitin-like (UB roll)		CATH (4.3.0)
B	3.10.20.10	Alpha Beta	Roll	Ubiquitin-like (UB roll)		CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF02017	CIDE-N domain (CIDE-N)	CIDE-N domain	This domain is found in CAD nuclease Swiss:O76075 , ICAD Swiss:O00273 the inhibitor of CAD nuclease. The two proteins interact through this domain.	Domain
B	PF02017	CIDE-N domain (CIDE-N)	CIDE-N domain	This domain is found in CAD nuclease Swiss:O76075 , ICAD Swiss:O00273 the inhibitor of CAD nuclease. The two proteins interact through this domain.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	DNA FRAGMENTATION FACTOR 40	DNA binding binding organic cyclic compound binding nucleic acid binding catalytic activity, acting on DNA nuclease activity hydrolase activity, acting on ester bonds catalytic activity, acting on a nucleic acid hydrolase activity catalytic activity DNA nuclease activity protein binding protein domain specific binding DNA endonuclease activity DNA binding binding organic cyclic compound binding nucleic acid binding catalytic activity, acting on DNA nuclease activity hydrolase activity, acting on ester bonds catalytic activity, acting on a nucleic acid hydrolase activity catalytic activity DNA nuclease activity protein binding protein domain specific binding DNA endonuclease activity endonuclease activity enzyme binding disordered domain specific binding identical protein binding	catabolic process primary metabolic process DNA metabolic process nucleic acid metabolic process macromolecule catabolic process nucleobase-containing compound catabolic process nucleobase-containing compound metabolic process DNA catabolic process nucleic acid catabolic process metabolic process macromolecule metabolic process negative regulation of biological process regulation of DNA catabolic process regulation of primary metabolic process catabolic process primary metabolic process DNA metabolic process nucleic acid metabolic process macromolecule catabolic process nucleobase-containing compound catabolic process nucleobase-containing compound metabolic process DNA catabolic process nucleic acid catabolic process metabolic process macromolecule metabolic process negative regulation of biological process regulation of DNA catabolic process regulation of primary metabolic process cellular component organization execution phase of apoptosis apoptotic nuclear changes negative regulation of nucleobase-containing compound metabolic process cellular component organization or biogenesis regulation of nucleobase-containing compound metabolic process regulation of apoptotic DNA fragmentation negative regulation of macromolecule metabolic process cellular component disassembly negative regulation of catabolic process regulation of biological process negative regulation of metabolic process biological regulation regulation of macromolecule metabolic process regulation of catabolic process cell death negative regulation of apoptotic DNA fragmentation apoptotic DNA fragmentation negative regulation of DNA catabolic process cellular component disassembly involved in execution phase of apoptosis cellular process negative regulation of DNA metabolic process apoptotic process programmed cell death regulation of metabolic process regulation of DNA metabolic process chromosome organization organelle organization apoptotic chromosome condensation chromosome condensation	membrane-bounded organelle intracellular anatomical structure nucleus membrane-enclosed lumen intracellular membrane-bounded organelle cellular anatomical entity nucleolus intracellular organelle lumen intracellular organelle organelle lumen organelle intracellular non-membrane-bounded organelle nuclear lumen non-membrane-bounded organelle membrane-bounded organelle intracellular anatomical structure nucleus membrane-enclosed lumen intracellular membrane-bounded organelle cellular anatomical entity nucleolus intracellular organelle lumen intracellular organelle organelle lumen organelle intracellular non-membrane-bounded organelle nuclear lumen non-membrane-bounded organelle cytoplasm cytosol nucleoplasm protein-containing complex protein-DNA complex chromatin chromosome
B	CHIMERA OF IGG BINDING PROTEIN G AND DNA FRAGMENTATION FACTOR 45	protein binding binding protein domain specific binding enzyme regulator activity molecular function inhibitor activity molecular function regulator activity nuclease inhibitor activity enzyme inhibitor activity deoxyribonuclease inhibitor activity protein folding chaperone	negative regulation of hydrolase activity regulation of catalytic activity negative regulation of deoxyribonuclease activity negative regulation of biological process negative regulation of catalytic activity regulation of primary metabolic process nucleobase-containing compound metabolic process regulation of deoxyribonuclease activity regulation of nuclease activity negative regulation of nucleobase-containing compound metabolic process regulation of nucleobase-containing compound metabolic process negative regulation of macromolecule metabolic process regulation of biological process negative regulation of metabolic process negative regulation of hydrolase activity regulation of catalytic activity negative regulation of deoxyribonuclease activity negative regulation of biological process negative regulation of catalytic activity regulation of primary metabolic process nucleobase-containing compound metabolic process regulation of deoxyribonuclease activity regulation of nuclease activity negative regulation of nucleobase-containing compound metabolic process regulation of nucleobase-containing compound metabolic process negative regulation of macromolecule metabolic process regulation of biological process negative regulation of metabolic process biological regulation negative regulation of molecular function primary metabolic process regulation of macromolecule metabolic process DNA metabolic process nucleic acid metabolic process regulation of molecular function regulation of hydrolase activity metabolic process negative regulation of DNA metabolic process macromolecule metabolic process regulation of metabolic process regulation of DNA metabolic process negative regulation of nuclease activity catabolic process macromolecule catabolic process regulation of DNA catabolic process cellular component organization execution phase of apoptosis DNA catabolic process apoptotic nuclear changes cellular component organization or biogenesis regulation of apoptotic DNA fragmentation cellular component disassembly negative regulation of catabolic process regulation of catabolic process cell death negative regulation of apoptotic DNA fragmentation nucleobase-containing compound catabolic process apoptotic DNA fragmentation negative regulation of DNA catabolic process cellular component disassembly involved in execution phase of apoptosis nucleic acid catabolic process cellular process apoptotic process programmed cell death organonitrogen compound metabolic process cellular biosynthetic process cellular metabolic process gene expression chaperone-mediated protein folding macromolecule biosynthetic process protein maturation protein folding biosynthetic process protein metabolic process positive regulation of programmed cell death regulation of cellular process regulation of apoptotic process positive regulation of biological process regulation of programmed cell death positive regulation of apoptotic process positive regulation of cellular process lymphocyte apoptotic process thymocyte apoptotic process leukocyte apoptotic process T cell apoptotic process negative regulation of programmed cell death negative regulation of execution phase of apoptosis regulation of execution phase of apoptosis negative regulation of apoptotic process negative regulation of cellular process	intracellular anatomical structure cytoplasm cellular anatomical entity cytosol cell periphery plasma membrane membrane membrane-bounded organelle nucleus membrane-enclosed lumen intracellular membrane-bounded organelle intracellular organelle lumen intracellular organelle nucleoplasm intracellular anatomical structure cytoplasm cellular anatomical entity cytosol cell periphery plasma membrane membrane membrane-bounded organelle nucleus membrane-enclosed lumen intracellular membrane-bounded organelle intracellular organelle lumen intracellular organelle nucleoplasm organelle lumen organelle nuclear lumen protein-containing complex protein-DNA complex intracellular non-membrane-bounded organelle chromatin chromosome non-membrane-bounded organelle

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR003508	CIDE-N domain	Domain
A	IPR044925	His-Me finger superfamily	Homologous Superfamily
A	IPR015311	DNA fragmentation factor 40, C-terminal	Domain
A	IPR039729	DNA fragmentation factor 40	Family
B	IPR003508	CIDE-N domain	Domain
B	IPR015121	DNA fragmentation factor 45kDa, middle domain	Domain
B	IPR017299	DNA fragmentation factor 45	Family
B	IPR027296	DNA fragmentation factor 45kDa, C-terminal	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 R01GM133198.