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- EMDB-23740: Cryo-EM structure of zebrafish TRPM5 in the presence of 1 mM EDTA -

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Basic information

Entry
Database: EMDB / ID: EMD-23740
TitleCryo-EM structure of zebrafish TRPM5 in the presence of 1 mM EDTA
Map dataNon-sharpened map of zebrafish TRPM5 with 1 mM EDTA
Sample
  • Complex: TRPM5 channel
    • Protein or peptide: Transient receptor potential melastatin 5
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: (25R)-14beta,17beta-spirost-5-en-3beta-ol
  • Ligand: (2R)-2-(hydroxymethyl)-4-{[(25R)-10alpha,14beta,17beta-spirost-5-en-3beta-yl]oxy}butyl 4-O-alpha-D-glucopyranosyl-beta-D-glucopyranoside
KeywordsIon channel / TRP channel / TRANSPORT PROTEIN
Function / homology
Function and homology information


calcium-activated cation channel activity / calcium channel activity / calcium ion binding / identical protein binding / plasma membrane
Similarity search - Function
Transient receptor potential channel, canonical / TRPM, SLOG domain / : / SLOG in TRPM / TRPM2-like domain / Ion transport domain / Ion transport protein
Similarity search - Domain/homology
Transient receptor potential cation channel subfamily M member 5
Similarity search - Component
Biological speciesDanio rerio (zebrafish)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.8 Å
AuthorsRuan Z / Lu W
Funding support United States, 5 items
OrganizationGrant numberCountry
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)R56HL144929 United States
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)R01NS111031 United States
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)R01HL153219 United States
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)R01NS112363 United States
American Heart Association20POST35120556 United States
CitationJournal: Nat Struct Mol Biol / Year: 2021
Title: Structures of the TRPM5 channel elucidate mechanisms of activation and inhibition.
Authors: Zheng Ruan / Emery Haley / Ian J Orozco / Mark Sabat / Richard Myers / Rebecca Roth / Juan Du / Wei Lü /
Abstract: The Ca-activated TRPM5 channel plays essential roles in taste perception and insulin secretion. However, the mechanism by which Ca regulates TRPM5 activity remains elusive. We report cryo-EM ...The Ca-activated TRPM5 channel plays essential roles in taste perception and insulin secretion. However, the mechanism by which Ca regulates TRPM5 activity remains elusive. We report cryo-EM structures of the zebrafish TRPM5 in an apo closed state, a Ca-bound open state, and an antagonist-bound inhibited state. We define two novel ligand binding sites: a Ca site (Ca) in the intracellular domain and an antagonist site in the transmembrane domain (TMD). The Ca site is unique to TRPM5 and has two roles: modulating the voltage dependence and promoting Ca binding to the Ca site, which is conserved throughout TRPM channels. Conformational changes initialized from both Ca sites cooperatively open the ion-conducting pore. The antagonist NDNA wedges into the space between the S1-S4 domain and pore domain, stabilizing the transmembrane domain in an apo-like closed state. Our results lay the foundation for understanding the voltage-dependent TRPM channels and developing new therapeutic agents.
History
DepositionApr 1, 2021-
Header (metadata) releaseSep 22, 2021-
Map releaseSep 22, 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: 0.0183
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by cylindrical radius
  • Surface level: 0.0183
  • Imaged by UCSF Chimera
  • Download
  • Surface view with fitted model
  • Atomic models: PDB-7mbp
  • Surface level: 0.0183
  • Imaged by UCSF Chimera
  • Download
Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_23740.png

Downloads & links

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Map

FileDownload / File: emd_23740.map.gz / Format: CCP4 / Size: 103 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationNon-sharpened map of zebrafish TRPM5 with 1 mM EDTA
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.04 Å/pix.
x 300 pix.
= 312.6 Å		1.04 Å/pix.
x 300 pix.
= 312.6 Å		1.04 Å/pix.
x 300 pix.
= 312.6 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.042 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.0183 / Movie #1: 0.0183
Minimum - Maximum-0.022561792 - 0.08109263
Average (Standard dev.)0.00008024221 (±0.003724464)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions300300300
Spacing300300300
CellA=B=C: 312.6 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.0421.0421.042
M x/y/z300300300
origin x/y/z0.0000.0000.000
length x/y/z312.600312.600312.600
α/β/γ90.00090.00090.000
start NX/NY/NZ-64-64-64
NX/NY/NZ128128128
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS300300300
D min/max/mean-0.0230.0810.000

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Supplemental data

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Additional map: Sharpened map of zebrafish TRPM5 with 1 mM EDTA

Fileemd_23740_additional_1.map
AnnotationSharpened map of zebrafish TRPM5 with 1 mM EDTA
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : TRPM5 channel

EntireName: TRPM5 channel
Components
  • Complex: TRPM5 channel
    • Protein or peptide: Transient receptor potential melastatin 5
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: (25R)-14beta,17beta-spirost-5-en-3beta-ol
  • Ligand: (2R)-2-(hydroxymethyl)-4-{[(25R)-10alpha,14beta,17beta-spirost-5-en-3beta-yl]oxy}butyl 4-O-alpha-D-glucopyranosyl-beta-D-glucopyranoside

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Supramolecule #1: TRPM5 channel

SupramoleculeName: TRPM5 channel / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Danio rerio (zebrafish)

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Macromolecule #1: Transient receptor potential melastatin 5

MacromoleculeName: Transient receptor potential melastatin 5 / type: protein_or_peptide / ID: 1 / Number of copies: 4 / Enantiomer: LEVO
Source (natural)Organism: Danio rerio (zebrafish)
Molecular weightTheoretical: 132.799 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MVEKSSERFD KQMAGRLGDI DFTGVSRTRG KFVRVTSSTD PAEIYQILTK QWGLAPPHLV VALMGGDEVA QLKPWLRDTL RKGLVKAAQ STGAWILTSG LRFGITKNLG QAVRDHSLAS TSPKVRVVAI GIAPWNMIQN RDLLLSAKPD HPATYPTEDL P YGAVYSLD ...String:
MVEKSSERFD KQMAGRLGDI DFTGVSRTRG KFVRVTSSTD PAEIYQILTK QWGLAPPHLV VALMGGDEVA QLKPWLRDTL RKGLVKAAQ STGAWILTSG LRFGITKNLG QAVRDHSLAS TSPKVRVVAI GIAPWNMIQN RDLLLSAKPD HPATYPTEDL P YGAVYSLD CNHSHFILVD EDPKRPGATG EMRVKMLKHI SLQRTGYGGT GSIEIPVLCL LVHGEPRILQ KMYKNIQNSI PW LILAGSG GVADILVTLM DRGCWDADIV QELLINTFPD GLHSTEITSW TKLIQRILDH GHLLTVHDPE QDSELDTVIL KAL VKACKS QSQEAQDFLD ELKLAVAWNR VDIAKSEIFS GDVQWSAQDL EEVMMEALVN DKPDFVRLFV DNGVNIKQFL TYGR LQELY CSVSEKNLLH TLLLKKNQER QAQLARKRMS GNPNNELGDR KFRFTFHEVS KVLKDFLDDT CKGFYQKLPA ERMGK GRLF HSQKNLPDMD RRCEHPWRDL FLWAILQNRQ EMANYFWAMG PEAVAAALVG CKIMKEMAHL ATEAESARSM KNAKYE QFA MDLFSECYSN SEDRAYSLLV RKTCCWSKAT VLNIATLAEA KCFFAHDGVQ ALLTKVWWGA MRTDTSISRL VLTFFIP PL VWTSLIKFNP EEQVSKDEGE PFAELDSLET EQALLLTDGD PVAGEGSAET AARSCSATFI RVVLRRWNRF WSAPVTVF M GNVIMYFAFL ILFSYVLLLD FRPPPPYGPS AAEIILYFWV FTLVLEEIRQ SFFTDEDMSI LKKMKLYVED NWNKCDMVA ISLFVVGLSC RMAMSTYEAG RTVLALDFMV FTLRLIHIFA IHKQLGPKII IVERMIKDVF FFLFFLSVWL IAYGVTTQAL LHPNDPRID WVFRRALYRP YLHIFGQIPL EEIDAAKMPD DNCTTDVQEI ILGTLPPCPN IYANWLVILL LVIYLLVTNV L LLNLLIAM FSYTFQVVQE NADIFWKFQR YNLIVEYHSR PALAPPFIII SHITQALLSF IKKTENTQDL LERELPSGLD QK LMTWETV QKENYLAKLE HEHRESSGER LRYTSSKVQT LLRMVGGFKD QEKRMATVET EVRYCGEVLS WIAECFHKST LKC DRDAPK APRSIAGSSR DQQPQGAKRQ QPGGHPAYGT DKKLPFIDH

UniProtKB: Transient receptor potential cation channel subfamily M member 5

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

MacromoleculeName: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 2 / Number of copies: 4 / Formula: NAG
Molecular weightTheoretical: 221.208 Da
Chemical component information

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

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Macromolecule #3: (25R)-14beta,17beta-spirost-5-en-3beta-ol

MacromoleculeName: (25R)-14beta,17beta-spirost-5-en-3beta-ol / type: ligand / ID: 3 / Number of copies: 4 / Formula: YUV
Molecular weightTheoretical: 414.621 Da
Chemical component information

ChemComp-YUV:
(25R)-14beta,17beta-spirost-5-en-3beta-ol

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Macromolecule #4: (2R)-2-(hydroxymethyl)-4-{[(25R)-10alpha,14beta,17beta-spirost-5-...

MacromoleculeName: (2R)-2-(hydroxymethyl)-4-{[(25R)-10alpha,14beta,17beta-spirost-5-en-3beta-yl]oxy}butyl 4-O-alpha-D-glucopyranosyl-beta-D-glucopyranoside
type: ligand / ID: 4 / Number of copies: 4 / Formula: YUY
Molecular weightTheoretical: 841.033 Da
Chemical component information

ChemComp-YUY:
(2R)-2-(hydroxymethyl)-4-{[(25R)-10alpha,14beta,17beta-spirost-5-en-3beta-yl]oxy}butyl 4-O-alpha-D-glucopyranosyl-beta-D-glucopyranoside

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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: 8
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: SUPER-RESOLUTION / Average electron dose: 49.6 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: PHASE FLIPPING ONLY
Startup modelType of model: NONE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.8 Å / Number images used: 84000
Initial angle assignmentType: RANDOM ASSIGNMENT
Final angle assignmentType: MAXIMUM LIKELIHOOD

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Atomic model buiding 1

RefinementProtocol: AB INITIO MODEL
Output model

PDB-7mbp:
Cryo-EM structure of zebrafish TRPM5 in the presence of 1 mM EDTA

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