Annotations: 6PLH

FAB fragment complexed with C-mannosylated tryptophan peptide

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
IMGT Antibody Annotation
SAbDab Antibody Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations
Protein Modification Annotation

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
B	d6plhb_	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	automated matches	(Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
A	d6plha1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	automated matches	(Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
A	d6plha2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	automated matches	(Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B	Carot_N	e6plhB1	A: a/b three-layered sandwiches	X: Immunoglobulin-like beta-sandwich	H: Anticodon-binding domain of a subclass of class I aminoacyl-tRNA synthetases	T: Anticodon-binding domain of a subclass of class I aminoacyl-tRNA synthetases	F: Carot_N	ECOD (v294.1)
A	Carot_N	e6plhA1	A: a/b three-layered sandwiches	X: Immunoglobulin-like beta-sandwich	H: Anticodon-binding domain of a subclass of class I aminoacyl-tRNA synthetases	T: Anticodon-binding domain of a subclass of class I aminoacyl-tRNA synthetases	F: Carot_N	ECOD (v294.1)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	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
B	house mouse	VH-CH1	Mus musculus (house mouse)	IGHV1-5501, IGHJ301, IGHG2A01, IGHG2A02	V-DOMAIN VH, C-DOMAIN CH1	IG	FAB-GAMMA-2A_KAPPA	IMGT (202615-0)
A	house mouse	L-KAPPA	Mus musculus (house mouse)	IGKV1-11001, IGKJ101, IGKJ201, IGKC01, IGKC*02	V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA	IG	FAB-GAMMA-2A_KAPPA	IMGT (202615-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B	Heavy Chain	IGHV1	-	interleukin-21 receptor	SAbDab (2026-04-24)
A	Light Chain	IGKV1	Kappa	interleukin-21 receptor	SAbDab (2026-04-24)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C	Interleukin-21 receptor	molecular transducer activity transmembrane signaling receptor activity signaling receptor activity cytokine receptor activity immune receptor activity interleukin-21 receptor activity	cellular response to stimulus regulation of biological process regulation of cellular process cell surface receptor signaling pathway response to stimulus signaling biological regulation response to cytokine cytokine-mediated signaling pathway cell communication response to peptide response to chemical cellular process cellular response to cytokine stimulus cellular response to stimulus regulation of biological process regulation of cellular process cell surface receptor signaling pathway response to stimulus signaling biological regulation response to cytokine cytokine-mediated signaling pathway cell communication response to peptide response to chemical cellular process cellular response to cytokine stimulus signal transduction multicellular organismal process immune system process cell activation natural killer cell activation lymphocyte activation leukocyte activation	cell periphery cellular anatomical structure plasma membrane membrane cell surface external side of plasma membrane side of membrane
B	Fab 5G12 heavy chain	-	-	-
A	Fab 5G12 light chain	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
C	IPR003531	Short hematopoietin receptor, family 1, conserved site	Conserved Site
C	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
C	IPR003961	Fibronectin type III	Domain
C	IPR036116	Fibronectin type III superfamily	Homologous Superfamily

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
C	: Q9HBE5	cryptosporidiosis-chronic cholangitis-liver disease syndrome IgE responsiveness, atopic ulcerative colitis allergic rhinitis head and neck cancer invasive ductal breast carcinoma Lupus Erythematosus, Systemic primary biliary cholangitis systemic lupus erythematosus asthma cutaneous lupus erythematosus malignant mesothelioma psoriasis tuberculosis chronic obstructive pulmonary disease cryptosporidiosis-chronic cholangitis-liver disease syndrome IgE responsiveness, atopic ulcerative colitis allergic rhinitis head and neck cancer invasive ductal breast carcinoma Lupus Erythematosus, Systemic primary biliary cholangitis systemic lupus erythematosus asthma cutaneous lupus erythematosus malignant mesothelioma psoriasis tuberculosis chronic obstructive pulmonary disease ductal breast carcinoma in situ interstitial cystitis lung adenocarcinoma osteosarcoma Sjogren syndrome

Protein Modification Annotation

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

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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.