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- EMDB-21576: Structure of an Apo membrane protein -

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Basic information

Entry
Database: EMDB / ID: EMD-21576
TitleStructure of an Apo membrane protein
Map dataStructure of an Apo membrane protein
Sample
  • Complex: Dimer of an Apo membrane protein
    • Protein or peptide: Endosomal/lysosomal potassium channel TMEM175
KeywordsChannel / MEMBRANE PROTEIN
Function / homology
Function and homology information


lysosomal lumen pH elevation / phagosome-lysosome fusion / regulation of lysosomal lumen pH / potassium ion leak channel activity / proton channel activity / arachidonate binding / potassium channel activity / potassium ion transmembrane transport / proton transmembrane transport / neuron cellular homeostasis ...lysosomal lumen pH elevation / phagosome-lysosome fusion / regulation of lysosomal lumen pH / potassium ion leak channel activity / proton channel activity / arachidonate binding / potassium channel activity / potassium ion transmembrane transport / proton transmembrane transport / neuron cellular homeostasis / lysosome / endosome / endosome membrane / lysosomal membrane
Similarity search - Function
Endosomal/lysomomal potassium channel TMEM175 / Endosomal/lysosomal potassium channel TMEM175
Similarity search - Domain/homology
Endosomal/lysosomal proton channel TMEM175
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.4 Å
AuthorsShen C / Fu TM
CitationJournal: To Be Published
Title: Structure of an Apo membrane protein
Authors: Shen C / Fu TM / Wang LF / Rawson S / Xia SY / Wu H
History
DepositionMar 20, 2020-
Header (metadata) releaseAug 4, 2021-
Map releaseAug 4, 2021-
UpdateJun 4, 2025-
Current statusJun 4, 2025Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.431
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by cylindrical radius
  • Surface level: 0.431
  • Imaged by UCSF Chimera
  • Download
  • Surface view with fitted model
  • Atomic models: PDB-6w8o
  • Surface level: 0.431
  • Imaged by UCSF Chimera
  • Download
Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_21576.png

Downloads & links

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Map

FileDownload / File: emd_21576.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationStructure of an Apo membrane protein
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.83 Å/pix.
x 256 pix.
= 211.2 Å		0.83 Å/pix.
x 256 pix.
= 211.2 Å		0.83 Å/pix.
x 256 pix.
= 211.2 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.825 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.431 / Movie #1: 0.431
Minimum - Maximum-1.1176062 - 1.6593826
Average (Standard dev.)0.008848959 (±0.07080683)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions256256256
Spacing256256256
CellA=B=C: 211.2 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z0.8250.8250.825
M x/y/z256256256
origin x/y/z0.0000.0000.000
length x/y/z211.200211.200211.200
α/β/γ90.00090.00090.000
start NX/NY/NZ000
NX/NY/NZ300300300
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS256256256
D min/max/mean-1.1181.6590.009

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Supplemental data

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Sample components

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Entire : Dimer of an Apo membrane protein

EntireName: Dimer of an Apo membrane protein
Components
  • Complex: Dimer of an Apo membrane protein
    • Protein or peptide: Endosomal/lysosomal potassium channel TMEM175

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Supramolecule #1: Dimer of an Apo membrane protein

SupramoleculeName: Dimer of an Apo membrane protein / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Endosomal/lysosomal potassium channel TMEM175

MacromoleculeName: Endosomal/lysosomal potassium channel TMEM175 / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 55.667219 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MSQPRTPEQA LDTPGDCPPG RRDEDAGEGI QCSQRMLSFS DALLSIIATV MILPVTHTEI SPEQQFDRSV QRLLATRIAV YLMTFLIVT VAWAAHTRLF QVVGKTDDTL ALLNLACMMT ITFLPYTFSL MVTFPDVPLG IFLFCVCVIA IGVVQALIVG Y AFHFPHLL ...String:
MSQPRTPEQA LDTPGDCPPG RRDEDAGEGI QCSQRMLSFS DALLSIIATV MILPVTHTEI SPEQQFDRSV QRLLATRIAV YLMTFLIVT VAWAAHTRLF QVVGKTDDTL ALLNLACMMT ITFLPYTFSL MVTFPDVPLG IFLFCVCVIA IGVVQALIVG Y AFHFPHLL SPQIQRSAHR ALYRRHVLGI VLQGPALCFA AAIFSLFFVP LSYLLMVTVI LLPYVSKVTG WCRDRLLGHR EP SAHPVEV FSFDLHEPLS KERVEAFSDG VYAIVATLLI LDICEDNVPD PKDVKERFSG SLVAALSATG PRFLAYFGSF ATV GLLWFA HHSLFLHVRK ATRAMGLLNT LSLAFVGGLP LAYQQTSAFA RQPRDELERV RVSCTIIFLA SIFQLAMWTT ALLH QAETL QPSVWFGGRE HVLMFAKLAL YPCASLLAFA STCLLSRFSV GIFHLMQIAV PCAFLLLRLL VGLALATLRV LRGLA RPEH PPPAPTGQDD PQSQLLPAPC

UniProtKB: Endosomal/lysosomal proton channel TMEM175

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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

BufferpH: 7.4
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 65.02 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 correctionType: NONE
Startup modelType of model: NONE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 145051
Initial angle assignmentType: PROJECTION MATCHING
Final angle assignmentType: ANGULAR RECONSTITUTION

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