Annotations: 4HKZ

Trastuzumab Fab complexed with Protein L and Protein A fragments

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
Thera-SAbDab Antibody 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)
D [auth E]	d4hkze1	Alpha and beta proteins (a+b)	beta-Grasp (ubiquitin-like)	Immunoglobulin-binding domains	Immunoglobulin-binding domains	automated matches	(Finegoldia magna ) [TaxId: 1260 ],	SCOPe (2.08)
D [auth E]	d4hkze2	Artifacts	Tags	Tags	Tags	N-terminal Tags	(Finegoldia magna ) [TaxId: 1260 ],	SCOPe (2.08)
C [auth H]	d4hkzh1	All alpha proteins	immunoglobulin/albumin-binding domain-like	Bacterial immunoglobulin/albumin-binding domains	Immunoglobulin-binding protein A modules	automated matches	(Staphylococcus aureus subsp. aureus Mu50 ) [TaxId: 158878 ],	SCOPe (2.08)
C [auth H]	d4hkzh2	Artifacts	Tags	Tags	Tags	N-terminal Tags	(Staphylococcus aureus subsp. aureus Mu50 ) [TaxId: 158878 ],	SCOPe (2.08)
B	d4hkzb_	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
A	d4hkza2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
A	d4hkza1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	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)
D [auth E]	SCOP2B Superfamily	Immunoglobulin-binding domains-like	8085561	3000399	SCOP2B (2022-06-29)
C [auth H]	SCOP2 Family	Immunoglobulin-binding protein A modules	8098331	4000790	SCOP2 (2022-06-29)
C [auth H]	SCOP2 Superfamily	Bacterial immunoglobulin/albumin-binding domains	8098332	3001373	SCOP2 (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
D [auth E]		e4hkzE1	A: alpha arrays	X: Flavodoxin-like	H: Class I glutamine amidotransferase-like	T: Phosphofructokinase N-terminal domain	F:	ECOD (v295.2)
C [auth H]		e4hkzH1	A: alpha arrays	X: Flavodoxin-like	H: Class I glutamine amidotransferase-like	T: Phosphofructokinase N-terminal domain	F:	ECOD (v295.2)
B	Sigma70_r2,Sigma70_ner	e4hkzB1	A: alpha arrays	X: TIM beta/alpha-barrel	H: TIM barrels	T: TIM barrels	F: Sigma70_r2,Sigma70_ner	ECOD (v295.2)
A		e4hkzA1	A: alpha arrays	X: Flavodoxin-like	H: Class I glutamine amidotransferase-like	T: Phosphofructokinase N-terminal domain	F:	ECOD (v295.2)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
D [auth E]	3.10.20.10	Alpha Beta	Roll	Ubiquitin-like (UB roll)		CATH (4.3.0)
C [auth H]	1.20.5.420	Mainly Alpha	Up-down Bundle	Single alpha-helices involved in coiled-coils or other helix-helix interfaces	Immunoglobulin FC, subunit C	CATH (4.3.0)
B	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
A	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	INN name	VH-CH1	Homo sapiens (human)	IGHV3-6601, IGHV3-6602, IGHV3-6604, IGHJ401, IGHJ402, IGHJ403, IGHG101, IGHG102, IGHG1*04	V-DOMAIN VH, C-DOMAIN CH1	IG	FAB-GAMMA-1_KAPPA	IMGT (202639-0)
A	INN name	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)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B	Heavy Chain	IGHV3	-	immunoglobulin g-binding protein a \| protein l fragment	SAbDab (2026-10-09)
A	Light Chain	IGKV1	Kappa	immunoglobulin g-binding protein a \| protein l fragment	SAbDab (2026-10-09)

Thera-SAbDab Antibody Annotation Thera-SAbDab Database Homepage

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

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
D [auth E]	Protein L fragment	protein-containing complex binding binding immunoglobulin binding IgG binding	-	-
C [auth H]	Immunoglobulin G-binding protein A	protein-containing complex binding binding immunoglobulin binding	-	-
B	Trastuzumab heavy chain	-	-	-
A	Trastuzumab light chain	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
D [auth E]	IPR009063	Immunoglobulin/albumin-binding domain superfamily	Homologous Superfamily
D [auth E]	IPR020840	Extracellular matrix-binding protein ebh, GA module	Domain
D [auth E]	IPR003147	Protein L, Ig light chain-binding	Repeat
D [auth E]	IPR040912	Repeat of unknown function DUF5633	Repeat
D [auth E]	IPR002988	Protein G-related albumin-binding (GA) module	Domain
D [auth E]	IPR035152	GA-like domain	Domain
D [auth E]	IPR019931	LPXTG cell wall anchor motif	Conserved Site
C [auth H]	IPR009063	Immunoglobulin/albumin-binding domain superfamily	Homologous Superfamily
C [auth H]	IPR005877	YSIRK Gram-positive signal peptide	Domain
C [auth H]	IPR036779	LysM domain superfamily	Homologous Superfamily
C [auth H]	IPR005038	Octapeptide repeat	Repeat
C [auth H]	IPR003132	Protein A, Ig-binding domain	Domain
C [auth H]	IPR018392	LysM domain	Domain
C [auth H]	IPR019931	LPXTG cell wall anchor motif	Conserved Site