6U8C | pdb_00006u8c

Crystal structure of an engineered ultra-high affinity Fab-Protein G complex

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
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)
F [auth H]	d6u8ch_	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	automated matches	human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
D	d6u8cd_	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	automated matches	human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
E [auth L]	d6u8cl2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	automated matches	Human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
E [auth L]	d6u8cl1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	Human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
C	d6u8cc2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	automated matches	Human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
C	d6u8cc1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	Human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
B	d6u8cb_	Alpha and beta proteins (a+b)	beta-Grasp (ubiquitin-like)	Immunoglobulin-binding domains	Immunoglobulin-binding domains	Immunoglobulin-binding protein G, different constituent domains	(Streptococcus sp. 'group G ) [TaxId: 1320 ],	SCOPe (2.08)
A	d6u8ca_	Alpha and beta proteins (a+b)	beta-Grasp (ubiquitin-like)	Immunoglobulin-binding domains	Immunoglobulin-binding domains	Immunoglobulin-binding protein G, different constituent domains	(Streptococcus sp. 'group G ) [TaxId: 1320 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
B	SCOP2B Superfamily	Immunoglobulin-binding domains-like	8072912	3000399	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Immunoglobulin-binding domains-like	8072912	3000399	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
F [auth H]	Beta_helix, CatAgl_D2	e6u8cH1	A: alpha bundles	X: P-loop domains-like	H: DUF1107-like	T: DUF1107-like	F: Beta_helix, CatAgl_D2	ECOD (develop294)
D	Beta_helix, CatAgl_D2	e6u8cD1	A: alpha bundles	X: P-loop domains-like	H: DUF1107-like	T: DUF1107-like	F: Beta_helix, CatAgl_D2	ECOD (develop294)
E [auth L]	Beta_helix, CatAgl_D2	e6u8cL1	A: alpha bundles	X: P-loop domains-like	H: DUF1107-like	T: DUF1107-like	F: Beta_helix, CatAgl_D2	ECOD (develop294)
C	Beta_helix, CatAgl_D2	e6u8cC1	A: alpha bundles	X: P-loop domains-like	H: DUF1107-like	T: DUF1107-like	F: Beta_helix, CatAgl_D2	ECOD (develop294)
B	Beta_helix, CatAgl_D2	e6u8cB1	A: alpha bundles	X: P-loop domains-like	H: DUF1107-like	T: DUF1107-like	F: Beta_helix, CatAgl_D2	ECOD (develop294)
A	Beta_helix, CatAgl_D2	e6u8cA1	A: alpha bundles	X: P-loop domains-like	H: DUF1107-like	T: DUF1107-like	F: Beta_helix, CatAgl_D2	ECOD (develop294)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
F [auth H]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
D	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
E [auth L]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
C	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
B	3.10.20.10	Alpha Beta	Roll	Ubiquitin-like (UB roll)		CATH (utative)
A	3.10.20.10	Alpha Beta	Roll	Ubiquitin-like (UB roll)		CATH (utative)

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, F [auth H]	Antibody Fab Fragment	VH-CH1	Homo sapiens (human)	IGHV3-6601, IGHV3-6602, IGHV3-6604, IGHJ401, IGHJ402, IGHJ403, IGHG101, IGHG102, IGHG104, IGHG105, IGHG112, IGHG114, IGHG113, IGHG109, IGHG110, IGHG107, IGHG1*11	V-DOMAIN VH, C-DOMAIN CH1	IG	FAB-GAMMA-1_KAPPA	IMGT (202610-0)
C, E [auth L]	Antibody Fab Fragment	L-KAPPA	Homo sapiens (human)	IGKV1D-1301, IGKV1-1302, IGKV1D-1302, IGKJ101, IGKC*01	V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA	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
D, F [auth H]	Heavy Chain	IGHV3	-	-	SAbDab (2026-03-20)
C, E [auth L]	Light Chain	IGKV1	Kappa	-	SAbDab (2026-03-20)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

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

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR009063	Immunoglobulin/albumin-binding domain superfamily	Homologous Superfamily
A, B	IPR005877	YSIRK Gram-positive signal peptide	Domain
A, B	IPR000724	IgG-binding B	Domain
A, B	IPR019950	M protein-type anchor motif	Conserved Site
A, B	IPR035152	GA-like domain	Domain
A, B	IPR019931	LPXTG cell wall anchor motif	Conserved Site

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.