5UCB | pdb_00005ucb

Structure of antigen-Fab complex with engineered switch residue region.

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
IMGT Antibody Annotation
SAbDab Antibody Annotation
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
C [auth B]	d5ucbb_	All beta proteins	Immunoglobulin-like beta-sandwich	ASF1-like	ASF1-like	automated matches	Baker's yeast (Saccharomyces cerevisiae S288C ) [TaxId: 559292 ],	SCOPe (2.08)
B [auth L]	d5ucbl2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
B [auth L]	d5ucbl1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
A [auth H]	d5ucbh_	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	automated matches	(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)
C [auth B]	SCOP2B Superfamily	ASF1-like	8055363	3002057	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
C [auth B]	SBP_bac_1	e5ucbB1	A: alpha bundles	X: Periplasmic binding protein-like II	H: Rubredoxin-related	T: Tetrapyrrole methylase C-terminal domain	F: SBP_bac_1	ECOD (develop294)
B [auth L]	SBP_bac_1	e5ucbL1	A: alpha bundles	X: Periplasmic binding protein-like II	H: Rubredoxin-related	T: Tetrapyrrole methylase C-terminal domain	F: SBP_bac_1	ECOD (develop294)
A [auth H]	Spa1_C	e5ucbH1	A: alpha bundles	X: Protein kinase/SAICAR synthase/ATP-grasp	H: Protein kinase/SAICAR synthase/ATP-grasp	T: Undecaprenyl diphosphate synthase	F: Spa1_C	ECOD (develop294)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
C [auth B]	2.60.40.1490	Mainly Beta	Sandwich	Immunoglobulin-like	Histone chaperone ASF1-like	CATH (4.3.0)
B [auth L]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
A [auth H]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)

IMGT Antibody Annotation IMGT Database Homepage

Chain	Protein Name	Description	Organism Name	Gene Allele Name(s)	Domain Name(s)	Receptor Type	Receptor Description	Provenance Source
B [auth L]	Antibody Fab Fragment	L-KAPPA	Homo sapiens (human)	IGKV1D-1301, IGKV1-1302, IGKV1-3901, IGKV1D-3901, IGKV1D-1302, IGKJ101, IGKC*01	V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA	IG	FAB-GAMMA-1_KAPPA	IMGT (202610-0)
A [auth H]	Antibody Fab Fragment	VH-CH1	Homo sapiens (human)	IGHV3-6601, IGHV3-6602, IGHV3-6604, IGHJ401, IGHJ402, IGHJ403, IGHG101, IGHG102, IGHG104, IGHG105	V-DOMAIN VH, C-DOMAIN CH1	IG	FAB-GAMMA-1_KAPPA	IMGT (202610-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B [auth L]	Light Chain	IGKV1	Kappa	histone chaperone asf1	SAbDab (2026-03-20)
A [auth H]	Heavy Chain	IGHV3	-	histone chaperone asf1	SAbDab (2026-03-20)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
C [auth B]	PF04729	ASF1 like histone chaperone (ASF1_hist_chap)	ASF1 like histone chaperone	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C [auth B]	Histone chaperone ASF1	protein binding binding histone binding enzyme regulator activity enzyme activator activity molecular function activator activity acetyltransferase activator activity molecular function regulator activity	cellular response to stimulus cellular response to stress response to stimulus response to stress cellular process protein-containing complex organization protein-DNA complex assembly cellular component organization protein-DNA complex organization cellular component biogenesis cellular component assembly chromatin organization protein-containing complex assembly chromatin remodeling cellular response to stimulus cellular response to stress response to stimulus response to stress cellular process protein-containing complex organization protein-DNA complex assembly cellular component organization protein-DNA complex organization cellular component biogenesis cellular component assembly chromatin organization protein-containing complex assembly chromatin remodeling cellular component organization or biogenesis nucleosome assembly nucleosome organization regulation of cellular process regulation of cell cycle phase transition negative regulation of biological process regulation of cellular response to stress negative regulation of cell cycle regulation of signal transduction intracellular signal transduction cell communication regulation of cell cycle checkpoint negative regulation of cell cycle phase transition signal transduction cell cycle regulation of biological process regulation of cell cycle process DNA integrity checkpoint signaling regulation of response to stimulus negative regulation of DNA damage checkpoint negative regulation of cell cycle checkpoint DNA damage checkpoint signaling signaling negative regulation of signaling negative regulation of intracellular signal transduction positive regulation of biological process cell cycle phase transition negative regulation of cell communication regulation of intracellular signal transduction regulation of response to stress negative regulation of cellular process positive regulation of cell cycle process regulation of cell cycle positive regulation of cellular process cell cycle process regulation of signaling negative regulation of response to stimulus biological regulation negative regulation of cell cycle process negative regulation of signal transduction positive regulation of cell cycle cell cycle checkpoint signaling DNA damage response positive regulation of cell cycle phase transition signal transduction in response to DNA damage regulation of cell communication regulation of DNA damage checkpoint subtelomeric heterochromatin formation negative regulation of macromolecule metabolic process regulation of biosynthetic process heterochromatin formation epigenetic regulation of gene expression negative regulation of metabolic process heterochromatin organization regulation of macromolecule metabolic process gene expression macromolecule biosynthetic process regulation of gene expression negative regulation of gene expression constitutive heterochromatin formation biosynthetic process negative regulation of biosynthetic process negative regulation of macromolecule biosynthetic process negative regulation of gene expression, epigenetic regulation of macromolecule biosynthetic process metabolic process macromolecule metabolic process regulation of metabolic process DNA replication-dependent chromatin assembly RNA metabolic process regulation of primary metabolic process nucleobase-containing compound metabolic process RNA biosynthetic process nucleic acid biosynthetic process DNA-templated transcription regulation of RNA metabolic process transcription by RNA polymerase II regulation of nucleobase-containing compound metabolic process regulation of RNA biosynthetic process regulation of transcription by RNA polymerase II primary metabolic process nucleobase-containing compound biosynthetic process nucleic acid metabolic process regulation of DNA-templated transcription silent mating-type cassette heterochromatin formation transcription elongation by RNA polymerase II positive regulation of DNA-templated transcription positive regulation of transcription elongation by RNA polymerase II positive regulation of macromolecule biosynthetic process positive regulation of metabolic process positive regulation of biosynthetic process positive regulation of DNA-templated transcription, elongation positive regulation of macromolecule metabolic process regulation of DNA-templated transcription elongation regulation of transcription elongation by RNA polymerase II positive regulation of transcription by RNA polymerase II positive regulation of RNA metabolic process DNA-templated transcription elongation positive regulation of RNA biosynthetic process cellular component disassembly protein-DNA complex disassembly protein-containing complex disassembly nucleosome disassembly DNA repair DNA metabolic process regulation of DNA repair regulation of DNA metabolic process	protein-containing complex intracellular anatomical structure catalytic complex intracellular membraneless organelle chromatin chromosome transferase complex H3 histone acetyltransferase complex histone acetyltransferase complex acetyltransferase complex intracellular organelle cellular anatomical structure organelle membraneless organelle protein-containing complex intracellular anatomical structure catalytic complex intracellular membraneless organelle chromatin chromosome transferase complex H3 histone acetyltransferase complex histone acetyltransferase complex acetyltransferase complex intracellular organelle cellular anatomical structure organelle membraneless organelle protein acetyltransferase complex intracellular protein-containing complex cytoplasm cytosol chromosome, telomeric region chromosomal region membrane-bounded organelle nucleus intracellular membrane-bounded organelle
B [auth L]	Fab Light Chain	-	-	-
A [auth H]	Fab Heavy Chain	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
C [auth B]	IPR017282	Histone deposition protein Asf1	Family
C [auth B]	IPR036747	Histone chaperone ASF1-like superfamily	Homologous Superfamily
C [auth B]	IPR006818	Histone chaperone ASF1-like	Family

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.