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- EMDB-26627: Human TMEM175 in an closed state -

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Basic information

Entry
Database: EMDB / ID: EMD-26627
TitleHuman TMEM175 in an closed state
Map dataClosed TMEM175
Sample
  • Complex: TMEM175
    • Protein or peptide: Endosomal/lysosomal potassium channel TMEM175
  • Ligand: POTASSIUM ION
  • Ligand: water
Keywordspotassium channel / 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 membrane / endosome / 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: 2.61 Å
AuthorsOh S / Hite RK
Funding support United States, 3 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM141553 United States
National Institutes of Health/National Cancer Institute (NIH/NCI)CA008748 United States
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI) United States
CitationJournal: Elife / Year: 2022
Title: Differential ion dehydration energetics explains selectivity in the non-canonical lysosomal K channel TMEM175.
Authors: SeCheol Oh / Fabrizio Marinelli / Wenchang Zhou / Jooyeon Lee / Ho Jeong Choi / Min Kim / José D Faraldo-Gómez / Richard K Hite /
Abstract: Structures of the human lysosomal K channel transmembrane protein 175 (TMEM175) in open and closed states revealed a novel architecture lacking the canonical K selectivity filter motif present in ...Structures of the human lysosomal K channel transmembrane protein 175 (TMEM175) in open and closed states revealed a novel architecture lacking the canonical K selectivity filter motif present in previously known K channel structures. A hydrophobic constriction composed of four isoleucine residues was resolved in the pore and proposed to serve as the gate in the closed state, and to confer ion selectivity in the open state. Here, we achieve higher-resolution structures of the open and closed states and employ molecular dynamics simulations to analyze the conducting properties of the putative open state, demonstrating that it is permeable to K and, to a lesser degree, also Na. Both cations must dehydrate significantly to penetrate the narrow hydrophobic constriction, but ion flow is assisted by a favorable electrostatic field generated by the protein that spans the length of the pore. The balance of these opposing energetic factors explains why permeation is feasible, and why TMEM175 is selective for K over Na, despite the absence of the canonical selectivity filter. Accordingly, mutagenesis experiments reveal an exquisite sensitivity of the channel to perturbations that mitigate the constriction. Together, these data reveal a novel mechanism for selective permeation of ions by TMEM175 that is unlike that of other K channels.
History
DepositionApr 11, 2022-
Header (metadata) releaseJun 29, 2022-
Map releaseJun 29, 2022-
UpdateFeb 14, 2024-
Current statusFeb 14, 2024Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_26627.png

Downloads & links

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Map

FileDownload / File: emd_26627.map.gz / Format: CCP4 / Size: 216 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationClosed TMEM175
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.85 Å/pix.
x 384 pix.
= 326.4 Å		0.85 Å/pix.
x 384 pix.
= 326.4 Å		0.85 Å/pix.
x 384 pix.
= 326.4 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.85 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.4
Minimum - Maximum-1.0488507 - 2.248336
Average (Standard dev.)-0.00019667456 (±0.034182772)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions384384384
Spacing384384384
CellA=B=C: 326.40002 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: Half map A

Fileemd_26627_half_map_1.map
AnnotationHalf map A
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half map B

Fileemd_26627_half_map_2.map
AnnotationHalf map B
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : TMEM175

EntireName: TMEM175
Components
  • Complex: TMEM175
    • Protein or peptide: Endosomal/lysosomal potassium channel TMEM175
  • Ligand: POTASSIUM ION
  • Ligand: water

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Supramolecule #1: TMEM175

SupramoleculeName: TMEM175 / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
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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Macromolecule #2: POTASSIUM ION

MacromoleculeName: POTASSIUM ION / type: ligand / ID: 2 / Number of copies: 5 / Formula: K
Molecular weightTheoretical: 39.098 Da

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Macromolecule #3: water

MacromoleculeName: water / type: ligand / ID: 3 / Number of copies: 55 / Formula: HOH
Molecular weightTheoretical: 18.015 Da
Chemical component information

ChemComp-HOH:
WATER

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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

Concentration4 mg/mL
BufferpH: 8
Component:
ConcentrationNameFormula
0.1 %Lauryl maltose neopentyl glycol
50.0 mMTris pH 8.0
150.0 mMPotassium ChlorideKCl
2.0 mMDithiothreitol
GridModel: Quantifoil R1.2/1.3 / Material: GOLD / Mesh: 400
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 298 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Average electron dose: 61.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.5 µm / Nominal defocus min: 0.8 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 4153614
Startup modelType of model: EMDB MAP
EMDB ID:

21603

Final reconstructionNumber classes used: 1 / Algorithm: FOURIER SPACE / Resolution.type: BY AUTHOR / Resolution: 2.61 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Number images used: 163651
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC

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