4IOF | pdb_00004iof

Crystal structure analysis of Fab-bound human Insulin Degrading Enzyme (IDE)

External Resource: Annotation

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

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A		e4iofA2	A: immunoglobulin/albumin-binding domain-like	X: EGF-related	H: Complement control module/SCR domain	T: V-set	F:	ECOD (20:10:01)
A		e4iofA5	A: Subtilisin-like	X: Subtilisin-like	H: Subtilisin-like	T: PRDM2_PR	F:	ECOD (20:10:01)
B		e4iofB5	A: Glutamine synthetase-like	X: Glutamine synthetase/guanido kinase	H: Glutamine synthetase/guanido kinase	T: PGM_PMM_I	F:	ECOD (20:10:01)
D		e4iofD4	A: Fusion glycoprotein F2	X: Fusion glycoprotein F2	H: Fusion glycoprotein F2	T: Glyco_hydro_2	F:	ECOD (20:10:01)
F		e4iofF3	A: Fusion glycoprotein F2	X: Fusion glycoprotein F2	H: Fusion glycoprotein F2	T: Glyco_hydro_2	F:	ECOD (20:10:01)
C		e4iofC1	A: immunoglobulin/albumin-binding domain-like	X: EGF-related	H: Complement control module/SCR domain	T: V-set	F:	ECOD (20:10:01)
E		e4iofE1	A: immunoglobulin/albumin-binding domain-like	X: EGF-related	H: Complement control module/SCR domain	T: V-set	F:	ECOD (20:10:01)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.30.830.10	Alpha Beta	2-Layer Sandwich	Cytochrome Bc1 Complex	Chain A, domain 1	CATH (4.3.0)
B	3.30.830.10	Alpha Beta	2-Layer Sandwich	Cytochrome Bc1 Complex	Chain A, domain 1	CATH (4.3.0)
D	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
F	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
C	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
E	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
D, F	Fab-bound IDE	L-KAPPA	Homo sapiens (human)	IGKV1-3901, IGKV1D-3901, IGKJ101, IGKC01	V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA	IG	FAB-GAMMA-1_KAPPA	IMGT (202609-0)
C, E	Fab-bound IDE	VH-CH1	Homo sapiens (human)	IGHV3-6601, IGHV3-6602, IGHV3-6604, IGHJ601, IGHJ602, IGHG101, IGHG102, IGHG104	V-DOMAIN VH, C-DOMAIN CH1	IG	FAB-GAMMA-1_KAPPA	IMGT (202609-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
D, F	Light Chain	IGKV1	Kappa	insulin-degrading enzyme	SAbDab (2026-03-13)
C, E	Heavy Chain	IGHV3	-	insulin-degrading enzyme	SAbDab (2026-03-13)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF05193	Peptidase M16 inactive domain (Peptidase_M16_C)	Peptidase M16 inactive domain	Peptidase M16 consists of two structurally related domains. One is the active peptidase, whereas the other is inactive. The two domains hold the substrate like a clamp [1].	Domain
A, B	PF16187	Middle or third domain of peptidase_M16 (Peptidase_M16_M)	Middle or third domain of peptidase_M16	-	Family
A, B	PF00675	Insulinase (Peptidase family M16) (Peptidase_M16)	Insulinase (Peptidase family M16)	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	Insulin-degrading enzyme	amyloid-beta binding binding peptide binding protein binding peptide hormone binding hormone binding insulin binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding amyloid-beta binding binding peptide binding protein binding peptide hormone binding hormone binding insulin binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding anion binding adenyl nucleotide binding ATP binding heterocyclic compound binding carbohydrate derivative binding ribonucleotide binding small molecule binding protein-containing complex binding peptidase activity catalytic activity, acting on a protein hydrolase activity catalytic activity endopeptidase activity beta-endorphin binding identical protein binding virus receptor activity exogenous protein binding metalloendopeptidase activity metallopeptidase activity protein homodimerization activity protein dimerization activity pyrophosphatase activity ATP hydrolysis activity ribonucleoside triphosphate phosphatase activity hydrolase activity, acting on acid anhydrides, in phosphorus-containing anhydrides hydrolase activity, acting on acid anhydrides ATP-dependent activity cation binding transition metal ion binding zinc ion binding metal ion binding	catabolic process metabolic process cellular process peptide metabolic process peptide catabolic process multicellular organismal process amyloid-beta metabolic process amyloid-beta clearance by cellular catabolic process amyloid-beta clearance primary metabolic process protein catabolic process protein metabolic process macromolecule metabolic process macromolecule catabolic process catabolic process metabolic process cellular process peptide metabolic process peptide catabolic process multicellular organismal process amyloid-beta metabolic process amyloid-beta clearance by cellular catabolic process amyloid-beta clearance primary metabolic process protein catabolic process protein metabolic process macromolecule metabolic process macromolecule catabolic process cellular homeostasis homeostatic process ubiquitin recycling bradykinin catabolic process cellular respiration aerobic respiration regulation of biological process regulation of cellular process energy derivation by oxidation of organic compounds biological regulation regulation of generation of precursor metabolites and energy generation of precursor metabolites and energy regulation of cellular respiration regulation of aerobic respiration regulation of metabolic process regulation of protein binding positive regulation of molecular function regulation of molecular function positive regulation of protein binding regulation of binding positive regulation of binding insulin metabolic process positive regulation of protein metabolic process positive regulation of biological process regulation of primary metabolic process positive regulation of metabolic process positive regulation of macromolecule metabolic process positive regulation of cellular process regulation of protein metabolic process regulation of macromolecule metabolic process regulation of catabolic process positive regulation of protein catabolic process positive regulation of catabolic process regulation of protein catabolic process negative regulation of proteolysis negative regulation of metabolic process negative regulation of biological process regulation of proteolysis proteolysis negative regulation of cellular process negative regulation of protein metabolic process negative regulation of macromolecule metabolic process cellular response to stimulus cellular response to nitrogen compound response to stimulus signaling response to peptide hormone insulin receptor signaling pathway cell surface receptor protein tyrosine kinase signaling pathway cell communication cellular response to endogenous stimulus response to hormone signal transduction enzyme-linked receptor protein signaling pathway cellular response to hormone stimulus cell surface receptor signaling pathway response to endogenous stimulus response to oxygen-containing compound cellular response to peptide hormone stimulus response to nitrogen compound cellular response to oxygen-containing compound cellular response to chemical stimulus response to chemical response to insulin cellular response to insulin stimulus antigen processing and presentation immune system process antigen processing and presentation of endogenous peptide antigen antigen processing and presentation of peptide antigen via MHC class I antigen processing and presentation of peptide antigen antigen processing and presentation of endogenous antigen antigen processing and presentation of endogenous peptide antigen via MHC class I regulation of hormone levels regulation of biological quality hormone metabolic process hormone catabolic process insulin catabolic process	cell periphery cellular anatomical structure cell surface membrane plasma membrane external side of plasma membrane side of membrane extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle extracellular region organelle extracellular space cell periphery cellular anatomical structure cell surface membrane plasma membrane external side of plasma membrane side of membrane extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle extracellular region organelle extracellular space vesicle extracellular membrane-bounded organelle intracellular anatomical structure cytoplasm cytosol basal part of cell basal plasma membrane plasma membrane region basolateral plasma membrane protein-containing complex catalytic complex peptidase complex cytosolic proteasome complex proteasome complex endopeptidase complex intracellular protein-containing complex intracellular organelle peroxisome microbody intracellular membrane-bounded organelle peroxisomal matrix membrane-enclosed lumen intracellular organelle lumen organelle lumen microbody lumen mitochondrion nucleus
D, F	Fab-bound IDE, light chain	-	-	-
C, E	Fab-bound IDE, heavy chain	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR011249	Metalloenzyme, LuxS/M16 peptidase-like	Homologous Superfamily
A, B	IPR001431	Peptidase M16, zinc-binding site	Binding Site
A, B	IPR007863	Peptidase M16, C-terminal	Domain
A, B	IPR054734	Coenzyme PQQ synthesis protein F-like, C-terminal lobe, domain 4	Domain
A, B	IPR011765	Peptidase M16, N-terminal	Domain
A, B	IPR050626	Peptidase M16	Family
A, B	IPR032632	Peptidase M16, middle/third domain	Domain

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, B	Pharos: P14735	Alzheimer disease Presenile dementia atopic eczema large cell medulloblastoma malignant ependymoma osteosarcoma psoriasis atypical teratoid rhabdoid tumor glioblastoma lung cancer non-alcoholic fatty liver disease ovarian cancer schizophrenia amyotrophic lateral sclerosis dementia Alzheimer disease Presenile dementia atopic eczema large cell medulloblastoma malignant ependymoma osteosarcoma psoriasis atypical teratoid rhabdoid tumor glioblastoma lung cancer non-alcoholic fatty liver disease ovarian cancer schizophrenia amyotrophic lateral sclerosis dementia invasive ductal breast carcinoma lymphoplasmacytic lymphoma non-small cell lung carcinoma

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.