Annotations: 5T1L

Cetuximab Fab in complex with CQA(Ph)2DLSTRRLKC peptide

External Resource: Annotation

Domain Annotation: ECOD Classification
Domain Annotation: CATH
IMGT Antibody Annotation
SAbDab Antibody Annotation
Thera-SAbDab Antibody Annotation
Protein Modification Annotation

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
D	Fer4+Fer4_7	e5t1lD1	A: alpha arrays	X: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4	H: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4	T: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4	F: Fer4+Fer4_7	ECOD (v295.2)
B	Fer4+Fer4_7	e5t1lB1	A: alpha arrays	X: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4	H: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4	T: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4	F: Fer4+Fer4_7	ECOD (v295.2)
C	Fer4+Fer4_7	e5t1lC1	A: alpha arrays	X: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4	H: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4	T: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4	F: Fer4+Fer4_7	ECOD (v295.2)
A	Fer4+Fer4_7	e5t1lA1	A: alpha arrays	X: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4	H: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4	T: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4	F: Fer4+Fer4_7	ECOD (v295.2)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
D	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
B	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
C	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
D	Cetuximab Fab	VH-CH1	Chimeric (chimeric)	IGHV2-203, IGHJ301, IGHG1*03	V-DOMAIN VH, C-DOMAIN CH1	IG	FAB-GAMMA-1_KAPPA	IMGT (202636-0)
B	Cetuximab Fab	VH-CH1	Chimeric (chimeric)	IGHV2-203, IGHJ301, IGHG1*03	V-DOMAIN VH, C-DOMAIN CH1	IG	FAB-GAMMA-1_KAPPA	IMGT (202636-0)
A, C	Cetuximab Fab	L-KAPPA	Chimeric (chimeric)	IGKV5-4801, IGKJ501, IGKJ2-301, IGKJ2-101, IGKJ2-201, IGKC01	V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA	IG	FAB-GAMMA-1_KAPPA	IMGT (202636-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
D	Heavy Chain	IGHV2	-	-	SAbDab (2026-09-18)
B	Heavy Chain	IGHV2	-	-	SAbDab (2026-09-18)
A, C	Light Chain	IGKV5	Kappa	-	SAbDab (2026-09-18)

Thera-SAbDab Antibody Annotation Thera-SAbDab Database Homepage

Chain	Name	Target	Provenance Source
B	Izalontamab	EGFR/ERBB1/HER1, ERBB3/HER3	Therapeutic SAbDab (2026-09-18)
A, C	Cetuximab	EGFR/ERBB1/HER1, ERBB3/HER3	Therapeutic SAbDab (2026-09-18)

Protein Modification Annotation

Modified Residue(s)
Chain	Residue(s)	Description
E, F	2GX	Parent Component: PHE
B	PCA	Parent Component: GLN : AA0031 : 2-pyrrolidone-5-carboxylic acid (Gln) MOD:00040 , 2-pyrrolidone-5-carboxylic acid (Glu) MOD:00420