Annotations: 4UB0

New design for monovalent bispecific IgG through cysteine engineering of the CH1-CL interface

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
IMGT Antibody Annotation
SAbDab Antibody Annotation
Thera-SAbDab Antibody Annotation

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
B [auth L]	d4ub0l_	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
A [auth H]	d4ub0h_	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: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B [auth L]	PTR2	e4ub0L1	A: alpha arrays	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: PTR2	ECOD (v295.2)
A [auth H]	PTR2	e4ub0H2	A: alpha arrays	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: PTR2	ECOD (v295.2)
A [auth H]	EF-hand_1, EF-hand_6, EF-hand_7	e4ub0H3	A: alpha arrays	X: Lipocalins/Streptavidin	H: SAM/DNA-glycosylase	T: SAM domain-like	F: EF-hand_1, EF-hand_6, EF-hand_7	ECOD (v295.2)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
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]	IgG1 Fab	L-KAPPA	Homo sapiens (human)	IGKV1-3901, IGKV1D-3901, IGKJ101, IGKC01	V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA	IG	FAB-GAMMA-1_KAPPA	IMGT (202639-0)
A [auth H]	IgG1 Fab	VH-CH1	Homo sapiens (human)	IGHV3-6601, IGHV3-6602, IGHV3-6604, IGHJ601, IGHJ602, IGHG101, IGHG102, IGHG104, IGHG1*05	V-DOMAIN VH, C-DOMAIN CH1	IG	FAB-GAMMA-1_KAPPA	IMGT (202639-0)

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	-	SAbDab (2026-10-09)
A [auth H]	Heavy Chain	IGHV3	-	-	SAbDab (2026-10-09)

Thera-SAbDab Antibody Annotation Thera-SAbDab Database Homepage

Chain	Name	Target	Provenance Source
B [auth L]	Timigutuzumab	ERBB2/CD340/HER2, SIRPA, CD3E, TNFRSF9/CD137/4-1BB	Therapeutic SAbDab (2026-10-09)
A [auth H]	Cinrebafusp	ERBB2/CD340/HER2, SIRPA, CD3E, TNFRSF9/CD137/4-1BB	Therapeutic SAbDab (2026-10-09)