Annotations: 6V3F

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF16414	Niemann-Pick C1 N terminus (NPC1_N)	Niemann-Pick C1 N terminus	This is the N-terminal domain of Niemann-Pick C1 family proteins. This family of proteins mediates transport of cholesterol from the intestinal lumen to enterocytes. This domain contains a cholesterol-binding pocket [1-2].	Domain
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

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	NPC1-like intracellular cholesterol transporter 1	small GTPase binding protein binding binding enzyme binding GTPase binding sterol binding alcohol binding steroid binding lipid binding cholesterol binding small molecule binding lipid transporter activity transporter activity heterocyclic compound binding small GTPase binding protein binding binding enzyme binding GTPase binding sterol binding alcohol binding steroid binding lipid binding cholesterol binding small molecule binding lipid transporter activity transporter activity heterocyclic compound binding identical protein binding protein homodimerization activity protein dimerization activity cytoskeletal protein binding myosin V binding myosin binding vitamin binding vitamin E binding	response to stimulus response to activity response to muscle activity response to chemical response to xenobiotic stimulus localization transport vitamin transport establishment of localization vitamin E metabolic process metabolic process cellular process cellular response to stimulus cellular response to stress response to stimulus response to activity response to muscle activity response to chemical response to xenobiotic stimulus localization transport vitamin transport establishment of localization vitamin E metabolic process metabolic process cellular process cellular response to stimulus cellular response to stress 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 primary metabolic process secondary alcohol metabolic process biosynthetic process sterol biosynthetic process alcohol biosynthetic process small molecule metabolic process steroid biosynthetic process lipid metabolic process intestinal lipid absorption multicellular organismal process digestion system process intestinal absorption digestive system process intestinal cholesterol absorption lipid digestion lipoprotein metabolic process protein metabolic process macromolecule metabolic process cholesterol import	cell periphery cellular anatomical structure apical part of cell membrane plasma membrane plasma membrane region apical plasma membrane brush border membrane cluster of actin-based cell projections plasma membrane bounded cell projection brush border cell projection cell projection membrane

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	IPR004765	NPC1-like	Family
A	IPR000731	Sterol-sensing domain	Domain
A	IPR053958	HMGCR/SNAP/NPC1-like, sterol-sensing domain	Domain

Membrane Protein Annotation: OPM OPM Database Homepage

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

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

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

Membrane Protein Annotation: MemProtMD MemProtMD Database Homepage

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

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

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

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.