9BEI | pdb_00009bei

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B	MIT	e9beiB01	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: MIT	ECOD (v294.2)
A	MIT	e9beiA01	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: MIT	ECOD (v294.2)

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
E [auth L]	Light Chain	IGKV1	Kappa	heat-labile enterotoxin b chain	SAbDab (2026-05-08)
D [auth K]	Heavy Chain	IGHV1	-	-	SAbDab (2026-05-08)
C [auth H]	Heavy Chain	IGHV3	-	heat-labile enterotoxin b chain	SAbDab (2026-05-08)

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
E [auth L]	COP-2 Fab Light chain	-	-	-
D [auth K]	Anti-fab nanobody	-	-	-
C [auth H]	COP-2 Fab Heavy chain	-	-	-
B	Heat-labile enterotoxin B chain	toxin activity	-	cellular anatomical structure extracellular region
A	Claudin-4	-	-	-

Chains	Accession	Name	Type
B	IPR003897	Clostridium enterotoxin	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.