Annotations: 7N4U

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B	Lon_lid	e7n4uB1	A: a/b three-layered sandwiches	X: RNase A-like	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: Lon_lid	ECOD (v294.1)
A	Lon_lid	e7n4uA1	A: a/b three-layered sandwiches	X: RNase A-like	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: Lon_lid	ECOD (v294.1)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	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, B	PF12349	Sterol-sensing domain of SREBP cleavage-activation (Sterol-sensing)	Sterol-sensing domain of SREBP cleavage-activation	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	Isoform 2 of NPC1-like intracellular cholesterol transporter 1	small GTPase binding protein binding binding enzyme binding GTPase binding identical protein binding protein homodimerization activity protein dimerization activity sterol binding alcohol binding steroid binding lipid binding cholesterol binding small molecule binding small GTPase binding protein binding binding enzyme binding GTPase binding identical protein binding protein homodimerization activity protein dimerization activity sterol binding alcohol binding steroid binding lipid binding cholesterol binding small molecule binding cytoskeletal protein binding myosin V binding myosin binding vitamin binding heterocyclic compound binding vitamin E binding	localization transport vitamin transport establishment of localization intestinal lipid absorption multicellular organismal process digestion system process intestinal absorption digestive system process intestinal cholesterol absorption lipid digestion vitamin E metabolic process metabolic process localization transport vitamin transport establishment of localization intestinal lipid absorption multicellular organismal process digestion system process intestinal absorption digestive system process intestinal cholesterol absorption lipid digestion vitamin E metabolic process metabolic process cellular process lipoprotein metabolic process primary metabolic process protein metabolic process macromolecule metabolic process cellular response to stimulus cellular response to stress response to stimulus cellular response to sterol depletion response to stress response to sterol depletion macromolecule localization lipid localization cholesterol transport lipid transport sterol transport organic hydroxy compound transport sterol homeostasis chemical homeostasis homeostatic process cholesterol homeostasis lipid homeostasis secondary alcohol biosynthetic process small molecule biosynthetic process cholesterol biosynthetic process sterol metabolic process steroid metabolic process cholesterol metabolic process lipid biosynthetic process alcohol metabolic process secondary alcohol metabolic process biosynthetic process sterol biosynthetic process alcohol biosynthetic process small molecule metabolic process steroid biosynthetic process lipid metabolic process	membrane-bounded organelle intracellular anatomical structure membrane intracellular vesicle intracellular membrane-bounded organelle intracellular organelle cytoplasmic vesicle membrane cellular anatomical structure vesicle membrane cytoplasmic vesicle organelle cytoplasm vesicle organelle membrane membrane-bounded organelle intracellular anatomical structure membrane intracellular vesicle intracellular membrane-bounded organelle intracellular organelle cytoplasmic vesicle membrane cellular anatomical structure vesicle membrane cytoplasmic vesicle organelle cytoplasm vesicle organelle membrane cell periphery apical part of cell plasma membrane plasma membrane region apical plasma membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR053956	NPC1, middle luminal domain	Domain
A, B	IPR032190	Niemann-Pick C1, N-terminal	Domain
A, B	IPR000731	Sterol-sensing domain	Domain
A, B	IPR053958	HMGCR/SNAP/NPC1-like, sterol-sensing domain	Domain

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, B	Pharos: Q9UHC9	sitosterolemia facioscapulohumeral muscular dystrophy Familial hypercholesterolemia - homozygous malignant pancreatic neoplasm pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia familial hyperlipidemia ovarian cancer pancreatic intraductal papillary-mucinous carcinoma ulcerative colitis

Membrane Protein Annotation: OPM OPM Database Homepage

Chains	External Link	Type	Class	Superfamily	Family
A, B	OPM	Transmembrane	Alpha-helical polytopic	Resistance-nodulation-cell division	Patched family

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

Chains	External Link	Comment
A, B	PDBTM	Annotated as membrane protein by PDBTM

Membrane Protein Annotation: MemProtMD MemProtMD Database Homepage

Chains	External Link	Comment
A, B	MemProtMD	Annotated as membrane protein by MemProtMD

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A, B	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Sterol-Sensing Domain (SSD) Proteins	Niemann-Pick C1-Like 1 (NPC1L1) cholesterol intracellular transporter

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.