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- EMDB-21547: NPC1 structure in GDN micelles at pH 5.5, conformation a -

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Basic information

Entry
Database: EMDB / ID: EMD-21547
TitleNPC1 structure in GDN micelles at pH 5.5, conformation a
Map data
Sample
  • Complex: NPC1 in GDN micelles at pH 5.5
    • Protein or peptide: NPC intracellular cholesterol transporter 1
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: CHOLESTEROL
KeywordsCholesterol Lysosome / TRANSPORT PROTEIN
Function / homology
Function and homology information


cyclodextrin metabolic process / cholesterol storage / membrane raft organization / intracellular cholesterol transport / intracellular lipid transport / sterol transport / intestinal cholesterol absorption / LDL clearance / negative regulation of epithelial cell apoptotic process / bile acid metabolic process ...cyclodextrin metabolic process / cholesterol storage / membrane raft organization / intracellular cholesterol transport / intracellular lipid transport / sterol transport / intestinal cholesterol absorption / LDL clearance / negative regulation of epithelial cell apoptotic process / bile acid metabolic process / programmed cell death / cholesterol transfer activity / cholesterol transport / establishment of protein localization to membrane / adult walking behavior / cholesterol efflux / lysosomal transport / cholesterol binding / negative regulation of macroautophagy / cellular response to steroid hormone stimulus / protein glycosylation / cellular response to low-density lipoprotein particle stimulus / response to cadmium ion / negative regulation of TORC1 signaling / neurogenesis / cholesterol metabolic process / cholesterol homeostasis / liver development / macroautophagy / autophagy / endocytosis / late endosome membrane / transmembrane signaling receptor activity / nuclear envelope / signaling receptor activity / virus receptor activity / gene expression / lysosome / membrane raft / response to xenobiotic stimulus / symbiont entry into host cell / lysosomal membrane / perinuclear region of cytoplasm / endoplasmic reticulum / Golgi apparatus / extracellular exosome / extracellular region / membrane / plasma membrane
Similarity search - Function
NPC1-like / Niemann-Pick C1, N-terminal / : / Niemann-Pick C1 N terminus / NPC1, middle luminal domain / : / Sterol-sensing domain of SREBP cleavage-activation / Sterol-sensing domain (SSD) profile. / Sterol-sensing domain
Similarity search - Domain/homology
NPC intracellular cholesterol transporter 1
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.7 Å
AuthorsYan N / Qian HW
Funding support United States, 1 items
OrganizationGrant numberCountry
National Science Foundation (NSF, United States)DMR-1420541 United States
CitationJournal: Cell / Year: 2020
Title: Structural Basis of Low-pH-Dependent Lysosomal Cholesterol Egress by NPC1 and NPC2.
Authors: Hongwu Qian / Xuelan Wu / Ximing Du / Xia Yao / Xin Zhao / Joyce Lee / Hongyuan Yang / Nieng Yan /
Abstract: Lysosomal cholesterol egress requires two proteins, NPC1 and NPC2, whose defects are responsible for Niemann-Pick disease type C (NPC). Here, we present systematic structural characterizations that ...Lysosomal cholesterol egress requires two proteins, NPC1 and NPC2, whose defects are responsible for Niemann-Pick disease type C (NPC). Here, we present systematic structural characterizations that reveal the molecular basis for low-pH-dependent cholesterol delivery from NPC2 to the transmembrane (TM) domain of NPC1. At pH 8.0, similar structures of NPC1 were obtained in nanodiscs and in detergent at resolutions of 3.6 Å and 3.0 Å, respectively. A tunnel connecting the N-terminal domain (NTD) and the transmembrane sterol-sensing domain (SSD) was unveiled. At pH 5.5, the NTD exhibits two conformations, suggesting the motion for cholesterol delivery to the tunnel. A putative cholesterol molecule is found at the membrane boundary of the tunnel, and TM2 moves toward formation of a surface pocket on the SSD. Finally, the structure of the NPC1-NPC2 complex at 4.0 Å resolution was obtained at pH 5.5, elucidating the molecular basis for cholesterol handoff from NPC2 to NPC1(NTD).
History
DepositionMar 13, 2020-
Header (metadata) releaseJun 17, 2020-
Map releaseJun 17, 2020-
UpdateMay 14, 2025-
Current statusMay 14, 2025Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.025
  • Imaged by UCSF Chimera
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  • Surface view colored by height
  • Surface level: 0.025
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6w5t
  • Surface level: 0.025
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_21547.png

Downloads & links

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Map

FileDownload / File: emd_21547.map.gz / Format: CCP4 / Size: 52.7 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.11 Å/pix.
x 240 pix.
= 267.36 Å		1.11 Å/pix.
x 240 pix.
= 267.36 Å		1.11 Å/pix.
x 240 pix.
= 267.36 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.114 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.025 / Movie #1: 0.025
Minimum - Maximum-0.08305353 - 0.1704146
Average (Standard dev.)0.00000017494636 (±0.004199314)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions240240240
Spacing240240240
CellA=B=C: 267.36 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.1141.1141.114
M x/y/z240240240
origin x/y/z0.0000.0000.000
length x/y/z267.360267.360267.360
α/β/γ90.00090.00090.000
start NX/NY/NZ000
NX/NY/NZ250250250
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS240240240
D min/max/mean-0.0830.1700.000

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Supplemental data

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Sample components

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Entire : NPC1 in GDN micelles at pH 5.5

EntireName: NPC1 in GDN micelles at pH 5.5
Components
  • Complex: NPC1 in GDN micelles at pH 5.5
    • Protein or peptide: NPC intracellular cholesterol transporter 1
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: CHOLESTEROL

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Supramolecule #1: NPC1 in GDN micelles at pH 5.5

SupramoleculeName: NPC1 in GDN micelles at pH 5.5 / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 150 KDa

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Macromolecule #1: NPC intracellular cholesterol transporter 1

MacromoleculeName: NPC intracellular cholesterol transporter 1 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 146.083688 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MTARGLALGL LLLLLCPAQV FSQSCVWYGE CGIAYGDKRY NCEYSGPPKP LPKDGYDLVQ ELCPGFFFGN VSLCCDVRQL QTLKDNLQL PLQFLSRCPS CFYNLLNLFC ELTCSPRQSQ FLNVTATEDY VDPVTNQTKT NVKELQYYVG QSFANAMYNA C RDVEAPSS ...String:
MTARGLALGL LLLLLCPAQV FSQSCVWYGE CGIAYGDKRY NCEYSGPPKP LPKDGYDLVQ ELCPGFFFGN VSLCCDVRQL QTLKDNLQL PLQFLSRCPS CFYNLLNLFC ELTCSPRQSQ FLNVTATEDY VDPVTNQTKT NVKELQYYVG QSFANAMYNA C RDVEAPSS NDKALGLLCG KDADACNATN WIEYMFNKDN GQAPFTITPV FSDFPVHGME PMNNATKGCD ESVDEVTAPC SC QDCSIVC GPKPQPPPPP APWTILGLDA MYVIMWITYM AFLLVFFGAF FAVWCYRKRY FVSEYTPIDS NIAFSVNASD KGE ASCCDP VSAAFEGCLR RLFTRWGSFC VRNPGCVIFF SLVFITACSS GLVFVRVTTN PVDLWSAPSS QARLEKEYFD QHFG PFFRT EQLIIRAPLT DKHIYQPYPS GADVPFGPPL DIQILHQVLD LQIAIENITA SYDNETVTLQ DICLAPLSPY NTNCT ILSV LNYFQNSHSV LDHKKGDDFF VYADYHTHFL YCVRAPASLN DTSLLHDPCL GTFGGPVFPW LVLGGYDDQN YNNATA LVI TFPVNNYYND TEKLQRAQAW EKEFINFVKN YKNPNLTISF TAERSIEDEL NRESDSDVFT VVISYAIMFL YISLALG HM KSCRRLLVDS KVSLGIAGIL IVLSSVACSL GVFSYIGLPL TLIVIEVIPF LVLAVGVDNI FILVQAYQRD ERLQGETL D QQLGRVLGEV APSMFLSSFS ETVAFFLGAL SVMPAVHTFS LFAGLAVFID FLLQITCFVS LLGLDIKRQE KNRLDIFCC VRGAEDGTSV QASESCLFRF FKNSYSPLLL KDWMRPIVIA IFVGVLSFSI AVLNKVDIGL DQSLSMPDDS YMVDYFKSIS QYLHAGPPV YFVLEEGHDY TSSKGQNMVC GGMGCNNDSL VQQIFNAAQL DNYTRIGFAP SSWIDDYFDW VKPQSSCCRV D NITDQFCN ASVVDPACVR CRPLTPEGKQ RPQGGDFMRF LPMFLSDNPN PKCGKGGHAA YSSAVNILLG HGTRVGATYF MT YHTVLQT SADFIDALKK ARLIASNVTE TMGINGSAYR VFPYSVFYVF YEQYLTIIDD TIFNLGVSLG AIFLVTMVLL GCE LWSAVI MCATIAMVLV NMFGVMWLWG ISLNAVSLVN LVMSCGISVE FCSHITRAFT VSMKGSRVER AEEALAHMGS SVFS GITLT KFGGIVVLAF AKSQIFQIFY FRMYLAMVLL GATHGLIFLP VLLSYIGPSV NKAKSCATEE RYKGTERERL LNFLE GSDE VDAGSHHHHH HHHHHGSVED YKDDDDK

UniProtKB: NPC intracellular cholesterol transporter 1

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Macromolecule #5: 2-acetamido-2-deoxy-beta-D-glucopyranose

MacromoleculeName: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 5 / Number of copies: 9 / Formula: NAG
Molecular weightTheoretical: 221.208 Da
Chemical component information

ChemComp-NAG:
2-acetamido-2-deoxy-beta-D-glucopyranose

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Macromolecule #6: CHOLESTEROL

MacromoleculeName: CHOLESTEROL / type: ligand / ID: 6 / Number of copies: 2 / Formula: CLR
Molecular weightTheoretical: 386.654 Da
Chemical component information

ChemComp-CLR:
CHOLESTEROL

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration15 mg/mL
BufferpH: 8
GridDetails: unspecified
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionSoftware - Name: Gctf / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: OTHER
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.7 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION / Number images used: 179336
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION

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