5ETU | pdb_00005etu

Chains	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
D	e5etuD1	A: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4	X: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4	H: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4	T: HTH_3	F:	ECOD (20:10:01)
B	e5etuB1	A: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4	X: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4	H: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4	T: HTH_3	F:	ECOD (20:10:01)
C	e5etuC1	A: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4	X: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4	H: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4	T: HTH_3	F:	ECOD (20:10:01)
A	e5etuA1	A: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4	X: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4	H: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4	T: HTH_3	F:	ECOD (20:10:01)

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)

Chain	Protein Name	Description	Organism Name	Gene Allele Name(s)	Domain Name(s)	Receptor Type	Receptor Description	Provenance Source
B, D	Cetuximab Fab	VH-CH1	Chimeric (chimeric)	IGHV2-203, IGHJ301, IGHG1*03	V-DOMAIN VH, C-DOMAIN CH1	IG	FAB-GAMMA-1_KAPPA	IMGT (202609-0)
A, C	Cetuximab Fab	L-KAPPA	Chimeric (chimeric)	IGKV5-4801, IGKJ501, IGKC*01	V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA	IG	FAB-GAMMA-1_KAPPA	IMGT (202609-0)

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B, D	Heavy Chain	IGHV2	-	-	SAbDab (2026-03-13)
A, C	Light Chain	IGKV5	Kappa	-	SAbDab (2026-03-13)

Chain	Name	Target	Provenance Source
B, D	Cetuximab	EGFR/ERBB1/HER1, ERBB3/HER3	Therapeutic SAbDab (2026-03-13)
A, C	Ficerafusp	EGFR/ERBB1/HER1, ERBB3/HER3	Therapeutic SAbDab (2026-03-13)

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.

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