Annotations: 1IMA

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

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Carbohydrate phosphatase-like	8037476	3001721	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Carbohydrate phosphatase-like	8037476	3001721	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)
A	PF00459	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: PF00459	ECOD (1.6)
A	PF00459	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: PF00459	ECOD (1.6)
B	PF00459	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: PF00459	ECOD (1.6)
B	PF00459	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: PF00459	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
A, B	PF00459	Inositol monophosphatase family (Inositol_P)	Inositol monophosphatase family	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	INOSITOL MONOPHOSPHATASE	cation binding magnesium ion binding ion binding binding metal ion binding small molecule binding phosphoric ester hydrolase activity inositol monophosphate phosphatase activity inositol phosphate phosphatase activity hydrolase activity, acting on ester bonds inositol monophosphate 4-phosphatase activity phosphatase activity hydrolase activity catalytic activity cation binding magnesium ion binding ion binding binding metal ion binding small molecule binding phosphoric ester hydrolase activity inositol monophosphate phosphatase activity inositol phosphate phosphatase activity hydrolase activity, acting on ester bonds inositol monophosphate 4-phosphatase activity phosphatase activity hydrolase activity catalytic activity lithium ion binding alkali metal ion binding identical protein binding protein binding protein homodimerization activity protein dimerization activity inositol monophosphate 1-phosphatase activity manganese ion binding transition metal ion binding inositol monophosphate 3-phosphatase activity	polyol metabolic process organic substance metabolic process inositol metabolic process organic hydroxy compound metabolic process alcohol metabolic process small molecule metabolic process metabolic process small molecule biosynthetic process inositol biosynthetic process biosynthetic process organic hydroxy compound biosynthetic process polyol biosynthetic process alcohol biosynthetic process organic substance biosynthetic process polyol metabolic process organic substance metabolic process inositol metabolic process organic hydroxy compound metabolic process alcohol metabolic process small molecule metabolic process metabolic process small molecule biosynthetic process inositol biosynthetic process biosynthetic process organic hydroxy compound biosynthetic process polyol biosynthetic process alcohol biosynthetic process organic substance biosynthetic process cellular biosynthetic process glycerophospholipid metabolic process lipid biosynthetic process phospholipid metabolic process phosphate-containing compound metabolic process phosphorus metabolic process phosphatidylinositol metabolic process glycerophospholipid biosynthetic process cellular metabolic process primary metabolic process phosphatidylinositol phosphate biosynthetic process phospholipid biosynthetic process phosphatidylinositol biosynthetic process glycerolipid biosynthetic process organophosphate metabolic process organophosphate biosynthetic process cellular lipid metabolic process cellular process glycerolipid metabolic process lipid metabolic process cellular response to stimulus regulation of biological process regulation of cellular process response to stimulus signaling biological regulation signal transduction cell communication	intracellular anatomical structure cytoplasm cellular anatomical entity cytosol

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR033942	Inositol monophosphatase	Family
A, B	IPR020552	Inositol monophosphatase, lithium-sensitive	Family
A, B	IPR020550	Inositol monophosphatase, conserved site	Conserved Site
A, B	IPR020583	Inositol monophosphatase, metal-binding site	Binding Site
A, B	IPR000760	Inositol monophosphatase-like	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, B	Pharos: P29218	intellectual disability, autosomal recessive 59 bipolar disorder visual epilepsy Jacksonian Seizure osteoarthritis rheumatoid arthritis X-linked mixed deafness with perilymphatic gusher intellectual disability juvenile idiopathic arthritis ovarian cancer pancreatic intraductal papillary-mucinous neoplasm hereditary spastic paraplegia ovarian carcinoma plasma cell myeloma IgA glomerulonephritis

Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage

Chains	Enzyme Name	Description	Catalytic Residues
A	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 \| Explore in 3D: M-CSA Motif Definition Search M-CSA Motif EC: 3.1.3.25 (PDB Primary Data) Search M-CSA Motif + EC 3.1.3.25

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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 R01GM133198.