Annotations: 6RCU

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	FIVAR	e6rcuA1	A: alpha bundles	X: Ten stranded beta/alpha barrel	H: Ten stranded beta/alpha barrel	T: Ten stranded beta/alpha barrel	F: FIVAR	ECOD (develop294)
B	TrbI	e6rcuB1	A: alpha bundles	X: Ten stranded beta/alpha barrel	H: Ten stranded beta/alpha barrel	T: Ten stranded beta/alpha barrel	F: TrbI	ECOD (develop294)
C	TrbI	e6rcuC1	A: alpha bundles	X: Ten stranded beta/alpha barrel	H: Ten stranded beta/alpha barrel	T: Ten stranded beta/alpha barrel	F: TrbI	ECOD (develop294)
D	FIVAR	e6rcuD1	A: alpha bundles	X: Ten stranded beta/alpha barrel	H: Ten stranded beta/alpha barrel	T: Ten stranded beta/alpha barrel	F: FIVAR	ECOD (develop294)
E	TrbI	e6rcuE1	A: alpha bundles	X: Ten stranded beta/alpha barrel	H: Ten stranded beta/alpha barrel	T: Ten stranded beta/alpha barrel	F: TrbI	ECOD (develop294)

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	mAb R5.004	VH-CH1	Homo sapiens (human)	IGHV1-6901, IGHV1-6912, IGHV1-6913, IGHV1-69D01, IGHJ302, IGHG101, IGHG102, IGHG104, IGHG105, IGHG112, IGHG114, IGHG113, IGHG109, IGHG110, IGHG107, IGHG111	V-DOMAIN VH, C-DOMAIN CH1	IG	FAB-GAMMA-1_LAMBDA	IMGT (202610-0)
C	mAb R5.004	L-LAMBDA	Homo sapiens (human)	IGLV1-4401, IGLJ302, IGLC201, IGLC202, IGLC3*04	V-DOMAIN V-LAMBDA, C-DOMAIN C-LAMBDA	IG	FAB-GAMMA-1_LAMBDA	IMGT (202610-0)
D	mAb R5.016	L-KAPPA	Homo sapiens (human)	IGKV1-503, IGKJ101, IGKJ201, IGKC01	V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA	IG	FAB-GAMMA-1_KAPPA	IMGT (202610-0)
E	mAb R5.016	H-GAMMA-1	Homo sapiens (human)	IGHV1-1801, IGHV1-1804, IGHJ601, IGHG101, IGHG102, IGHG104, IGHG105, IGHG112, IGHG114, IGHG113, IGHG109, IGHG110, IGHG107, IGHG111	V-DOMAIN VH, C-DOMAIN CH1, C-DOMAIN CH2, C-DOMAIN CH3	IG	FAB-GAMMA-1_KAPPA	IMGT (202610-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B	Heavy Chain	IGHV1	-	reticulocyte binding protein homologue 5	SAbDab (2026-03-20)
C	Light Chain	IGLV1	Lambda	reticulocyte binding protein homologue 5	SAbDab (2026-03-20)
D	Light Chain	IGKV1	Kappa	reticulocyte binding protein homologue 5	SAbDab (2026-03-20)
E	Heavy Chain	IGHV1	-	reticulocyte binding protein homologue 5	SAbDab (2026-03-20)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Reticulocyte binding protein homologue 5	heparin binding glycosaminoglycan binding binding carbohydrate derivative binding sulfur compound binding host cell surface binding host cell surface receptor binding	biological process involved in interspecies interaction between organisms symbiont entry into host biological process involved in interaction with host biological process involved in symbiotic interaction symbiont entry into host cell viral process viral life cycle	membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure cytoplasmic vesicle organelle intracellular vesicle cytoplasm intracellular membrane-bounded organelle vesicle apical part of cell extracellular region rhoptry apical complex membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure cytoplasmic vesicle organelle intracellular vesicle cytoplasm intracellular membrane-bounded organelle vesicle apical part of cell extracellular region rhoptry apical complex host extracellular space host cellular component other organism part cell-cell junction apical junction complex bicellular tight junction tight junction anchoring junction cell junction host cell part host cell membrane host cell plasma membrane protein-containing complex rhoptry lumen organelle lumen membrane-enclosed lumen
B	R5.004 heavy chain	-	-	-
C	R5.004 light chain	-	-	-
D	R5.016 light chain	-	-	-
E	R5.016 heavy chain	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR041668	RBP-2-like, helical domain	Domain

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.