Annotations: 37LU

NPC1-NPC2 complex with bis-sterol molecule JM046, pH 5.5

External Resource: Annotation

Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF22314	NPC1, middle luminal domain (NPC1_MLD)	NPC1, middle luminal domain	NPC intracellular cholesterol transporter 1 (NPC1) is a endosomal/lysosomal membrane protein that facilitates the trafficking of cholesterol and other cargo from lysosomes and is involved in cholesterol homeostasis. Mutations in the NPC1 gene cause t ...	NPC intracellular cholesterol transporter 1 (NPC1) is a endosomal/lysosomal membrane protein that facilitates the trafficking of cholesterol and other cargo from lysosomes and is involved in cholesterol homeostasis. Mutations in the NPC1 gene cause the rare neurodegenerative disease Niemann-Pick Type C (NPC). This entry represents the middle luminal domain (MLD) of NPC1, which contains the Ebola glycoprotein interacting site [5].	Domain
A	PF12349	Sterol-sensing domain of SREBP cleavage-activation (Sterol-sensing)	Sterol-sensing domain of SREBP cleavage-activation	-	Family
B [auth D]	PF02221	ML domain (E1_DerP2_DerF2)	ML domain	ML domain - MD-2-related lipid recognition domain. This family consists of proteins from plants, animals and fungi, including dust mite allergen Der P 2 (Swiss:P49278). It has been implicate in lipid recognition, particularly in the recognition of pa ...	ML domain - MD-2-related lipid recognition domain. This family consists of proteins from plants, animals and fungi, including dust mite allergen Der P 2 (Swiss:P49278). It has been implicate in lipid recognition, particularly in the recognition of pathogen related products. A mutation in Npc2 (Swiss:Q15668) causes a rare form of Niemann-Pick type C2 disease. This domain has a similar topology to immunoglobulin domains.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	NPC intracellular cholesterol transporter 1	molecular transducer activity signaling receptor activity sterol binding binding alcohol binding steroid binding lipid binding cholesterol binding small molecule binding sterol transfer activity lipid carrier activity lipid transfer activity transporter activity cholesterol transfer activity molecular transducer activity signaling receptor activity sterol binding binding alcohol binding steroid binding lipid binding cholesterol binding small molecule binding sterol transfer activity lipid carrier activity lipid transfer activity transporter activity cholesterol transfer activity molecular carrier activity transmembrane signaling receptor activity	cellular localization intracellular lipid transport transport lipid localization lipid transport intracellular transport establishment of localization localization macromolecule localization establishment of localization in cell cellular process bile acid metabolic process oxoacid metabolic process steroid metabolic process cellular localization intracellular lipid transport transport lipid localization lipid transport intracellular transport establishment of localization localization macromolecule localization establishment of localization in cell cellular process bile acid metabolic process oxoacid metabolic process steroid metabolic process carboxylic acid metabolic process primary metabolic process metabolic process small molecule metabolic process monocarboxylic acid metabolic process lipid metabolic process membrane organization cellular component organization membrane raft organization cellular component organization or biogenesis biological process involved in interspecies interaction between organisms symbiont entry into host cell viral process symbiont entry into host viral life cycle biological process involved in interaction with host biological process involved in symbiotic interaction catabolic process autophagy process utilizing autophagic mechanism cholesterol transport sterol transport organic hydroxy compound transport intracellular cholesterol transport lysosomal transport intracellular sterol transport vesicle-mediated transport lysosome to ER cholesterol transport vacuolar transport sterol homeostasis chemical homeostasis homeostatic process cholesterol homeostasis lipid homeostasis carbohydrate derivative biosynthetic process glycoprotein biosynthetic process carbohydrate derivative metabolic process glycoprotein metabolic process macromolecule biosynthetic process biosynthetic process protein metabolic process macromolecule metabolic process gene expression intestinal lipid absorption multicellular organismal process digestion system process intestinal absorption digestive system process intestinal cholesterol absorption lipid digestion cholesterol efflux cellular response to stimulus regulation of cellular process response to stimulus signaling negative regulation of signaling negative regulation of intracellular signal transduction negative regulation of biological process regulation of signal transduction intracellular signal transduction negative regulation of cell communication cell communication negative regulation of TORC1 signaling regulation of intracellular signal transduction negative regulation of TOR signaling negative regulation of cellular process signal transduction regulation of TORC1 signaling TOR signaling regulation of biological process regulation of signaling regulation of TOR signaling negative regulation of response to stimulus biological regulation negative regulation of signal transduction regulation of response to stimulus regulation of cell communication TORC1 signaling establishment of protein localization establishment of protein localization to membrane localization within membrane response to metal ion response to chemical response to cadmium ion regulation of epithelial cell apoptotic process negative regulation of programmed cell death regulation of apoptotic process regulation of programmed cell death cell death epithelial cell apoptotic process negative regulation of apoptotic process negative regulation of epithelial cell apoptotic process apoptotic process programmed cell death	vacuolar membrane membrane-bounded organelle cytoplasmic side of lysosomal membrane intracellular anatomical structure cytoplasmic side of membrane membrane lytic vacuole vacuole intracellular membrane-bounded organelle side of membrane intracellular organelle lytic vacuole membrane cellular anatomical structure bounding membrane of organelle vacuolar membrane membrane-bounded organelle cytoplasmic side of lysosomal membrane intracellular anatomical structure cytoplasmic side of membrane membrane lytic vacuole vacuole intracellular membrane-bounded organelle side of membrane intracellular organelle lytic vacuole membrane cellular anatomical structure bounding membrane of organelle organelle lysosomal membrane cytoplasm organelle membrane lysosome organelle envelope nuclear envelope nucleus endomembrane system extracellular exosome extracellular vesicle extracellular organelle extracellular region vesicle extracellular membrane-bounded organelle cell periphery plasma membrane membrane microdomain membrane raft endosome membrane endosome intracellular vesicle late endosome membrane cytoplasmic vesicle membrane cytoplasmic vesicle vesicle membrane late endosome Golgi apparatus perinuclear region of cytoplasm endoplasmic reticulum
B [auth D]	NPC intracellular cholesterol transporter 2	sterol binding binding alcohol binding steroid binding lipid binding cholesterol binding small molecule binding sterol transfer activity lipid carrier activity lipid transfer activity transporter activity cholesterol transfer activity molecular carrier activity protein binding sterol binding binding alcohol binding steroid binding lipid binding cholesterol binding small molecule binding sterol transfer activity lipid carrier activity lipid transfer activity transporter activity cholesterol transfer activity molecular carrier activity protein binding enzyme binding	localization transport macromolecule localization phospholipid transport lipid localization lipid transport establishment of localization organophosphate ester transport cholesterol transport sterol transport organic hydroxy compound transport cellular localization intracellular lipid transport intracellular cholesterol transport localization transport macromolecule localization phospholipid transport lipid localization lipid transport establishment of localization organophosphate ester transport cholesterol transport sterol transport organic hydroxy compound transport cellular localization intracellular lipid transport intracellular cholesterol transport intracellular transport lysosomal transport intracellular sterol transport vesicle-mediated transport establishment of localization in cell lysosome to ER cholesterol transport cellular process vacuolar transport sterol homeostasis chemical homeostasis homeostatic process cholesterol homeostasis lipid homeostasis regulation of biological process regulation of cellular process regulation of lipid metabolic process biological regulation primary metabolic process regulation of primary metabolic process regulation of isoprenoid metabolic process metabolic process regulation of metabolic process lipid metabolic process isoprenoid metabolic process cholesterol efflux biological process involved in interspecies interaction between organisms response to stimulus response to other organism response to external stimulus response to external biotic stimulus response to virus response to biotic stimulus glycolipid transport carbohydrate derivative transport	membrane-bounded organelle intracellular anatomical structure membrane-enclosed lumen lytic vacuole vacuolar lumen vacuole intracellular membrane-bounded organelle lysosomal lumen intracellular organelle lumen intracellular organelle cellular anatomical structure organelle lumen organelle cytoplasm membrane-bounded organelle intracellular anatomical structure membrane-enclosed lumen lytic vacuole vacuolar lumen vacuole intracellular membrane-bounded organelle lysosomal lumen intracellular organelle lumen intracellular organelle cellular anatomical structure organelle lumen organelle cytoplasm lysosome extracellular exosome extracellular vesicle extracellular organelle extracellular region vesicle extracellular membrane-bounded organelle intracellular vesicle cytoplasmic vesicle lumen endomembrane system cytoplasmic vesicle vesicle lumen azurophil granule secretory granule lumen azurophil granule lumen secretory granule primary lysosome secretory vesicle endosome late endosome endoplasmic reticulum

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR053956	NPC1, middle luminal domain	Domain
A	IPR032190	Niemann-Pick C1, N-terminal	Domain
A	IPR000731	Sterol-sensing-like domain	Domain
A	IPR004765	NPC1-like	Family
A	IPR053958	HMGCR/SNAP/NPC1-like, sterol-sensing domain	Domain
B [auth D]	IPR003172	MD-2-related lipid-recognition domain	Domain
B [auth D]	IPR033916	Npc2 like, ML domain	Domain
B [auth D]	IPR014756	Immunoglobulin E-set	Homologous Superfamily
B [auth D]	IPR039670	Sterol transport protein NPC2-like	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A	: O15118	Niemann-Pick disease ophthalmoplegia Niemann-Pick disease, type C1 obesity disorder gastrointestinal stromal tumor Ataxia atherosclerosis cirrhosis of liver liver disease brucellosis osteosarcoma sphingolipidosis histiocytosis inborn errors of metabolism large cell medulloblastoma Niemann-Pick disease ophthalmoplegia Niemann-Pick disease, type C1 obesity disorder gastrointestinal stromal tumor Ataxia atherosclerosis cirrhosis of liver liver disease brucellosis osteosarcoma sphingolipidosis histiocytosis inborn errors of metabolism large cell medulloblastoma lysosomal storage disease metabolic syndrome X ovarian cancer Gaucher disease hydrops fetalis adrenal cortex carcinoma intellectual disability leukodystrophy lung cancer malignant pancreatic neoplasm C syndrome non-Langerhans cell histiocytosis psoriasis heart disease tuberculosis arteriosclerosis disorder lung carcinoma medulloblastoma cholestasis Niemann-Pick disease type C Down syndrome
B [auth D]	: P61916	Niemann-Pick disease Niemann-Pick disease, type C2 ovarian cancer peripheral nervous system disease sphingolipidosis astrocytic tumor C syndrome Down syndrome histiocytosis intellectual disability lung cancer malignant ependymoma pancreatic intraductal papillary-mucinous carcinoma peripheral neuropathy subependymal giant cell astrocytoma Niemann-Pick disease Niemann-Pick disease, type C2 ovarian cancer peripheral nervous system disease sphingolipidosis astrocytic tumor C syndrome Down syndrome histiocytosis intellectual disability lung cancer malignant ependymoma pancreatic intraductal papillary-mucinous carcinoma peripheral neuropathy subependymal giant cell astrocytoma Ataxias, Hereditary cholestasis Duchenne muscular dystrophy large cell medulloblastoma lung carcinoma malignant glioma non-Langerhans cell histiocytosis pancreatic intraductal papillary-mucinous neoplasm pilocytic astrocytoma atypical teratoid rhabdoid tumor glioblastoma inborn errors of metabolism leukodystrophy lysosomal storage disease