Annotations: 5GIR

Crystal structure of a Fab fragment with its ligand peptide

External Resource: Annotation

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: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
D [auth B]	Pyridoxal_deC	e5girB1	A: a/b three-layered sandwiches	X: cradle loop barrel	H: RIFT-related	T: Alanine racemase-C	F: Pyridoxal_deC	ECOD (v294.1)
B [auth L]	Pyridoxal_deC	e5girL1	A: a/b three-layered sandwiches	X: cradle loop barrel	H: RIFT-related	T: Alanine racemase-C	F: Pyridoxal_deC	ECOD (v294.1)
C [auth A]	Pyridoxal_deC	e5girA1	A: a/b three-layered sandwiches	X: cradle loop barrel	H: RIFT-related	T: Alanine racemase-C	F: Pyridoxal_deC	ECOD (v294.1)
A [auth H]	Pyridoxal_deC	e5girH1	A: a/b three-layered sandwiches	X: cradle loop barrel	H: RIFT-related	T: Alanine racemase-C	F: Pyridoxal_deC	ECOD (v294.1)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
D [auth B]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
B [auth L]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
C [auth A]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
A [auth H]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)

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 [auth L], D [auth B]	mAb MsMab-1, anti-IDH1/2	L-KAPPA	Mus musculus (house mouse)	IGKV5-4301, IGKJ202, IGKJ401, IGKC01, IGKC*02	V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA	IG	FAB-GAMMA-2A_KAPPA	IMGT (202615-0)
A [auth H], C [auth A]	mAb MsMab-1, anti-IDH1/2	VH-CH1	Mus musculus (house mouse)	IGHV1-6101, IGHJ201, IGHG2A01, IGHG2A02	V-DOMAIN VH, C-DOMAIN CH1	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 [auth L], D [auth B]	Light Chain	IGKV5	Kappa	lys-pro-ile-ile-ile-gly-ser-his-ala-tyr-gly-asp	SAbDab (2026-04-24)
A [auth H], C [auth A]	Heavy Chain	IGHV1	-	lys-pro-ile-ile-ile-gly-ser-his-ala-tyr-gly-asp	SAbDab (2026-04-24)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
E [auth C], F [auth D]	LYS-PRO-ILE-ILE-ILE-GLY-SER-HIS-ALA-TYR-GLY-ASP	cation binding magnesium ion binding ion binding binding metal ion binding small molecule binding nucleoside phosphate binding purine nucleotide binding adenyl nucleotide binding nucleotide binding heterocyclic compound binding NADP binding identical protein binding protein binding cation binding magnesium ion binding ion binding binding metal ion binding small molecule binding nucleoside phosphate binding purine nucleotide binding adenyl nucleotide binding nucleotide binding heterocyclic compound binding NADP binding identical protein binding protein binding protein homodimerization activity protein dimerization activity cell adhesion molecule binding cadherin binding isocitrate dehydrogenase [NAD(P)+] activity oxidoreductase activity oxidoreductase activity, acting on the CH-OH group of donors, NAD or NADP as acceptor isocitrate dehydrogenase (NADP+) activity oxidoreductase activity, acting on CH-OH group of donors catalytic activity NAD binding	nucleoside phosphate metabolic process nicotinamide nucleotide metabolic process primary metabolic process nucleotide metabolic process NADP+ metabolic process purine-containing compound metabolic process nucleobase-containing compound metabolic process purine nucleotide metabolic process organophosphate metabolic process nucleobase-containing small molecule metabolic process phosphate-containing compound metabolic process pyridine-containing compound metabolic process metabolic process cellular process nucleoside phosphate metabolic process nicotinamide nucleotide metabolic process primary metabolic process nucleotide metabolic process NADP+ metabolic process purine-containing compound metabolic process nucleobase-containing compound metabolic process purine nucleotide metabolic process organophosphate metabolic process nucleobase-containing small molecule metabolic process phosphate-containing compound metabolic process pyridine-containing compound metabolic process metabolic process cellular process small molecule metabolic process phosphorus metabolic process secondary alcohol metabolic process isocitrate metabolic process tricarboxylic acid metabolic process oxoacid metabolic process carboxylic acid metabolic process alcohol metabolic process organic acid metabolic process generation of precursor metabolites and energy NADPH regeneration regulation of cellular process regulation of lipid metabolic process lipid biosynthetic process regulation of primary metabolic process phospholipid metabolic process regulation of biosynthetic process regulation of biological process biological regulation regulation of phospholipid metabolic process phospholipid biosynthetic process regulation of phospholipid biosynthetic process biosynthetic process organophosphate biosynthetic process regulation of phosphorus metabolic process regulation of lipid biosynthetic process regulation of metabolic process lipid metabolic process catabolic process phospholipid catabolic process organophosphate catabolic process regulation of phospholipid catabolic process lipid catabolic process regulation of catabolic process regulation of lipid catabolic process glutathione metabolic process modified amino acid metabolic process sulfur compound metabolic process aerobic respiration cellular respiration tricarboxylic acid cycle energy derivation by oxidation of organic compounds carbohydrate metabolic process glyoxylate metabolic process glyoxylate cycle aldehyde metabolic process monocarboxylic acid metabolic process response to lipid response to stimulus response to hormone response to steroid hormone response to chemical response to endogenous stimulus response to oxidative stress response to stress 2-oxoglutarate metabolic process dicarboxylic acid metabolic process developmental process multicellular organismal process gonad development reproductive system development reproductive process female gonad development sex differentiation animal organ development female sex differentiation development of primary female sexual characteristics developmental process involved in reproduction multicellular organism development development of primary sexual characteristics anatomical structure development reproductive structure development system development	membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle extracellular exosome extracellular vesicle extracellular organelle extracellular region vesicle extracellular membrane-bounded organelle membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle extracellular exosome extracellular vesicle extracellular organelle extracellular region vesicle extracellular membrane-bounded organelle cytosol membrane-enclosed lumen intracellular vesicle ficolin-1-rich granule endomembrane system intracellular organelle lumen organelle lumen cytoplasmic vesicle ficolin-1-rich granule lumen secretory granule secretory vesicle tertiary granule lumen tertiary granule vesicle lumen cytoplasmic vesicle lumen secretory granule lumen peroxisome microbody peroxisomal matrix microbody lumen
B [auth L], D [auth B]	Light chain of Fab fragment	-	-	-
A [auth H], C [auth A]	Heavy chain of Fab fragment	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
E [auth C], F [auth D]	IPR024084	Isopropylmalate dehydrogenase-like domain	Domain
E [auth C], F [auth D]	IPR004790	Isocitrate dehydrogenase NADP-dependent	Family
E [auth C], F [auth D]	IPR019818	Isocitrate/isopropylmalate dehydrogenase, conserved site	Conserved Site

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
E [auth C], F [auth D]	: O75874	Ollier disease oligodendroglioma cholangiocarcinoma Maffucci syndrome chondroma malignant glioma acute myeloid leukemia hemangioma childhood oligodendroglioma Neoplasm Recurrence, Local epithelioid hemangioma giant cell glioblastoma acute promyelocytic leukemia prostate cancer oligoastrocytoma Ollier disease oligodendroglioma cholangiocarcinoma Maffucci syndrome chondroma malignant glioma acute myeloid leukemia hemangioma childhood oligodendroglioma Neoplasm Recurrence, Local epithelioid hemangioma giant cell glioblastoma acute promyelocytic leukemia prostate cancer oligoastrocytoma glioblastoma adult oligodendroglioma gliosarcoma placental hemangioma primary myelofibrosis intrahepatic cholangiocarcinoma mixed glioma glioma hepatocellular carcinoma intramuscular hemangioma medulloblastoma colorectal cancer pancreatic ductal adenocarcinoma pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia glioma susceptibility 1 pituitary cancer anaplastic astrocytoma hematologic disease astrocytic tumor interstitial cystitis bile duct cancer tuberculosis brain disease lymphoplasmacytic lymphoma cancer metaphyseal chondromatosis with D-2-hydroxyglutaric aciduria congenital anemia myelofibrosis exocrine pancreatic carcinoma pancreatic intraductal papillary-mucinous carcinoma peroxisomal disease anaplastic oligodendroglioma hematopoietic and lymphoid system neoplasm atypical teratoid rhabdoid tumor biliary tract neoplasm brain glioma childhood acute lymphoblastic leukemia malignant pancreatic neoplasm nasopharyngeal carcinoma ovarian cancer pancreatic intraductal papillary-mucinous neoplasm pilocytic astrocytoma aleukemic leukemia primitive neuroectodermal tumor benign neoplasm spinal cord disease bone disease lung adenocarcinoma

Protein Modification Annotation

Modified Residue(s)
Chain	Residue(s)	Description
A [auth H], C [auth A]	PCA	Parent Component: GLN : AA0031 : 2-pyrrolidone-5-carboxylic acid (Gln) MOD:00040 , 2-pyrrolidone-5-carboxylic acid (Glu) MOD:00420

RCSB PDB is hosted by

RCSB PDB is a member of

RCSB Partners
Nucleic Acid Knowledgebase

CoreTrustSeal

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.