1IMA
STRUCTURAL ANALYSIS OF INOSITOL MONOPHOSPHATASE COMPLEXES WITH SUBSTRATES
External Resource: Annotation
- Domain Annotation: SCOP/SCOPe Classification
- Domain Annotation: SCOP2 Classification
- Domain Annotation: ECOD Classification
- Domain Annotation: CATH
- Protein Family Annotation
- Gene Ontology: Gene Product Annotation
- InterPro: Protein Family Classification
- Pharos: Disease Associations
- Structure Motif: Primary M-CSA Annotation
Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage
Chains | Domain Info | Class | Fold | Superfamily | Family | Domain | Species | Provenance Source (Version) |
---|---|---|---|---|---|---|---|---|
A | d1imaa_ | Multi-domain proteins (alpha and beta) | Carbohydrate phosphatase | Carbohydrate phosphatase | Inositol monophosphatase/fructose-1,6-bisphosphatase-like | Inositol monophosphatase | human (Homo sapiens ) [TaxId: 9606 ], | SCOPe (2.08) |
B | d1imab_ | Multi-domain proteins (alpha and beta) | Carbohydrate phosphatase | Carbohydrate phosphatase | Inositol monophosphatase/fructose-1,6-bisphosphatase-like | Inositol monophosphatase | human (Homo sapiens ) [TaxId: 9606 ], | SCOPe (2.08) |
Domain Annotation: SCOP2 Classification SCOP2 Database Homepage
Domain Annotation: ECOD Classification ECOD Database Homepage
Chains | Family Name | Domain Identifier | Architecture | Possible Homology | Homology | Topology | Family | Provenance Source (Version) |
---|---|---|---|---|---|---|---|---|
A | Inositol_P_N | e1imaA1 | A: a+b two layers | X: a+b domain in carbohydrate phosphatases (From Topology) | H: a+b domain in carbohydrate phosphatases (From Topology) | T: a+b domain in carbohydrate phosphatases | F: Inositol_P_N | ECOD (1.6) |
A | Inositol_P_C | e1imaA2 | A: a/b three-layered sandwiches | X: Rossmann-like domain in carbohydrate phosphatases (From Homology) | H: Rossmann-like domain in carbohydrate phosphatases | T: Rossmann-like domain in carbohydrate phosphatases | F: Inositol_P_C | ECOD (1.6) |
B | Inositol_P_N | e1imaB1 | A: a+b two layers | X: a+b domain in carbohydrate phosphatases (From Topology) | H: a+b domain in carbohydrate phosphatases (From Topology) | T: a+b domain in carbohydrate phosphatases | F: Inositol_P_N | ECOD (1.6) |
B | Inositol_P_C | e1imaB2 | A: a/b three-layered sandwiches | X: Rossmann-like domain in carbohydrate phosphatases (From Homology) | H: Rossmann-like domain in carbohydrate phosphatases | T: Rossmann-like domain in carbohydrate phosphatases | F: Inositol_P_C | ECOD (1.6) |
Domain Annotation: CATH CATH Database Homepage
Chain | Domain | Class | Architecture | Topology | Homology | Provenance Source (Version) |
---|---|---|---|---|---|---|
A | 3.30.540.10 | Alpha Beta | 2-Layer Sandwich | Fructose-1,6-Bisphosphatase | Chain A, domain 1 | CATH (4.3.0) |
A | 3.40.190.80 | Alpha Beta | 3-Layer(aba) Sandwich | D-Maltodextrin-Binding Protein | domain 2 | CATH (4.3.0) |
B | 3.30.540.10 | Alpha Beta | 2-Layer Sandwich | Fructose-1,6-Bisphosphatase | Chain A, domain 1 | CATH (4.3.0) |
B | 3.40.190.80 | Alpha Beta | 3-Layer(aba) Sandwich | D-Maltodextrin-Binding Protein | domain 2 | CATH (4.3.0) |
Protein Family Annotation Pfam Database Homepage
Chains | Accession | Name | Description | Comments | Source |
---|---|---|---|---|---|
PF00459 | Inositol monophosphatase family (Inositol_P) | Inositol monophosphatase family | - | Family |
Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage
InterPro: Protein Family Classification InterPro Database Homepage
Chains | Accession | Name | Type |
---|---|---|---|
IPR033942 | Inositol monophosphatase | Family | |
IPR020552 | Inositol monophosphatase, lithium-sensitive | Family | |
IPR020550 | Inositol monophosphatase, conserved site | Conserved Site | |
IPR020583 | Inositol monophosphatase, metal-binding site | Binding Site | |
IPR000760 | Inositol monophosphatase-like | Family |
Pharos: Disease Associations Pharos Homepage Annotation
Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage
Chains | Enzyme Name | Description | Catalytic Residues |
---|---|---|---|
inositol-phosphate phosphatase M-CSA #577 | Mammalian brain inositol monophosphatase (IMPase) provides inositol for the biosynthesis of the key secondary messenger precursor, phosphatidylinositol 4,5-bisphosphate. Phosphatidylinositol 4,5-bisphosphate is hydrolysed by phosphatidylinositidase C in response to receptor occupation to give diacylglycerol (DAG) and inositol 1,4,5-trisphosphate (Ins 1,4,5-P3), both of which mediate signal transduction through specific interactions with their own targets. DAG activates protein kinase C which modulates the activity of many enzymes through phosphorylation, while Ins 1,4,5-P3 causes the release of calcium ions from an intracellular store. Brain cells vary in their ability to take up inositol and a series of phosphatases exist to sequentially hydrolyse Ins 1,4,5-P3 and other inositol polyphosphates via the bisphosphates to give inositol 1- and 4-monophosphates, substrates for IMPase. The effect of blocking IMPase with inhibitor Li+ cations is depletion of free inositol in brain cells and, thus, several groups have suggested that IMPase might be the target for the lithium ions in manic depression therapy. | Defined by 6 residues: GLU:A-70ASP:A-90ILE:A-92ASP:A-93THR:A-95ASP:A-220 | EC: 3.1.3.25 (PDB Primary Data) |