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- EMDB-20244: Cryo-EM structure of TMEM16F in digitonin with calcium bound -

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Basic information

Entry
Database: EMDB / ID: EMD-20244
TitleCryo-EM structure of TMEM16F in digitonin with calcium bound
Map datasharpened map
Sample
  • Complex: TMEM16F with calcium bound
    • Protein or peptide: Anoctamin-6
  • Ligand: CALCIUM ION
KeywordsTMEM16F / scramblase / MEMBRANE PROTEIN
Function / homology
Function and homology information


calcium activated phospholipid scrambling / calcium activated phosphatidylserine scrambling / calcium activated phosphatidylcholine scrambling / calcium activated galactosylceramide scrambling / positive regulation of potassium ion export across plasma membrane / positive regulation of monoatomic ion transmembrane transport / purinergic nucleotide receptor signaling pathway / phospholipid scramblase activity / bone mineralization involved in bone maturation / intracellularly calcium-gated chloride channel activity ...calcium activated phospholipid scrambling / calcium activated phosphatidylserine scrambling / calcium activated phosphatidylcholine scrambling / calcium activated galactosylceramide scrambling / positive regulation of potassium ion export across plasma membrane / positive regulation of monoatomic ion transmembrane transport / purinergic nucleotide receptor signaling pathway / phospholipid scramblase activity / bone mineralization involved in bone maturation / intracellularly calcium-gated chloride channel activity / cholinergic synapse / plasma membrane phospholipid scrambling / voltage-gated monoatomic ion channel activity / negative regulation of cell volume / positive regulation of phagocytosis, engulfment / bleb assembly / Stimuli-sensing channels / calcium-activated cation channel activity / positive regulation of monocyte chemotaxis / chloride transport / dendritic cell chemotaxis / phospholipid translocation / chloride channel complex / regulation of postsynaptic membrane potential / positive regulation of bone mineralization / Neutrophil degranulation / chloride transmembrane transport / establishment of localization in cell / synaptic membrane / calcium ion transmembrane transport / blood coagulation / positive regulation of apoptotic process / protein homodimerization activity / identical protein binding / metal ion binding / plasma membrane
Similarity search - Function
Anoctamin, dimerisation domain / Anoctamin, dimerisation domain / Anoctamin / : / Calcium-activated chloride channel
Similarity search - Domain/homology
Biological speciesMus musculus (house mouse)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.5 Å
AuthorsFeng S / Dang S
Funding support United States, France, 6 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01GM098672 United States
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)R01NS069229 United States
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)R35NS097229 United States
National Institutes of Health/Office of the DirectorS10OD0020054 United States
National Institutes of Health/Office of the DirectorS10OD021741 United States
Human Frontier Science Program (HFSP) France
CitationJournal: Cell Rep / Year: 2019
Title: Cryo-EM Studies of TMEM16F Calcium-Activated Ion Channel Suggest Features Important for Lipid Scrambling.
Authors: Shengjie Feng / Shangyu Dang / Tina Wei Han / Wenlei Ye / Peng Jin / Tong Cheng / Junrui Li / Yuh Nung Jan / Lily Yeh Jan / Yifan Cheng /
Abstract: As a Ca-activated lipid scramblase and ion channel that mediates Ca influx, TMEM16F relies on both functions to facilitate extracellular vesicle generation, blood coagulation, and bone formation. How ...As a Ca-activated lipid scramblase and ion channel that mediates Ca influx, TMEM16F relies on both functions to facilitate extracellular vesicle generation, blood coagulation, and bone formation. How a bona fide ion channel scrambles lipids remains elusive. Our structural analyses revealed the coexistence of an intact channel pore and PIP-dependent protein conformation changes leading to membrane distortion. Correlated to the extent of membrane distortion, many tightly bound lipids are slanted. Structure-based mutagenesis studies further reveal that neutralization of some lipid-binding residues or those near membrane distortion specifically alters the onset of lipid scrambling, but not Ca influx, thus identifying features outside of channel pore that are important for lipid scrambling. Together, our studies demonstrate that membrane distortion does not require open hydrophilic grooves facing the membrane interior and provide further evidence to suggest separate pathways for lipid scrambling and ion permeation.
History
DepositionMay 26, 2019-
Header (metadata) releaseJul 17, 2019-
Map releaseJul 24, 2019-
UpdateNov 20, 2024-
Current statusNov 20, 2024Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.05
  • Imaged by UCSF Chimera
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  • Surface view colored by cylindrical radius
  • Surface level: 0.05
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6p46
  • Surface level: 0.05
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_20244.png

Downloads & links

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Map

FileDownload / File: emd_20244.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Annotationsharpened map
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.06 Å/pix.
x 256 pix.
= 271.104 Å		1.06 Å/pix.
x 256 pix.
= 271.104 Å		1.06 Å/pix.
x 256 pix.
= 271.104 Å

Surface

Projections

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Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.059 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.05 / Movie #1: 0.05
Minimum - Maximum-0.249594 - 0.29031348
Average (Standard dev.)0.00007735141 (±0.006467372)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions256256256
Spacing256256256
CellA=B=C: 271.104 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.0591.0591.059
M x/y/z256256256
origin x/y/z0.0000.0000.000
length x/y/z271.104271.104271.104
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS256256256
D min/max/mean-0.2500.2900.000

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Supplemental data

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Additional map: unsharpened map

Fileemd_20244_additional.map
Annotationunsharpened map
Projections & Slices
AxesZYX

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Density Histograms

Histogram

Histogram (log scale)

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Half map: half map 1

Fileemd_20244_half_map_1.map
Annotationhalf map 1
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: half map 2

Fileemd_20244_half_map_2.map
Annotationhalf map 2
Projections & Slices
AxesZYX

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Histogram (log scale)

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Sample components

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Entire : TMEM16F with calcium bound

EntireName: TMEM16F with calcium bound
Components
  • Complex: TMEM16F with calcium bound
    • Protein or peptide: Anoctamin-6
  • Ligand: CALCIUM ION

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Supramolecule #1: TMEM16F with calcium bound

SupramoleculeName: TMEM16F with calcium bound / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Mus musculus (house mouse)

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Macromolecule #1: Anoctamin-6

MacromoleculeName: Anoctamin-6 / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 106.367727 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MQMMTRKVLL NMELEEDDDE DGDIVLENFD QTIVCPTFGS LENQQDFRTP EFEEFNGKPD SLFFTDGQRR IDFILVYEDE SKKENNKKG TNEKQKRKRQ AYESNLICHG LQLEATRSVS DDKLVFVKVH APWEVLCTYA EIMHIKLPLK PNDLKTRSPF G NLNWFTKV ...String:
MQMMTRKVLL NMELEEDDDE DGDIVLENFD QTIVCPTFGS LENQQDFRTP EFEEFNGKPD SLFFTDGQRR IDFILVYEDE SKKENNKKG TNEKQKRKRQ AYESNLICHG LQLEATRSVS DDKLVFVKVH APWEVLCTYA EIMHIKLPLK PNDLKTRSPF G NLNWFTKV LRVNESVIKP EQEFFTAPFE KSRMNDFYIL DRDSFFNPAT RSRIVYFILS RVKYQVMNNV NKFGINRLVS SG IYKAAFP LHDCRFNYES EDISCPSERY LLYREWAHPR SIYKKQPLDL IRKYYGEKIG IYFAWLGYYT QMLLLAAVVG VAC FLYGYL DQDNCTWSKE VCDPDIGGQI LMCPQCDRLC PFWRLNITCE SSKKLCIFDS FGTLIFAVFM GVWVTLFLEF WKRR QAELE YEWDTVELQQ EEQARPEYEA QCNHVVINEI TQEEERIPFT TCGKCIRVTL CASAVFFWIL LIIASVIGII VYRLS VFIV FSTTLPKNPN GTDPIQKYLT PQMATSITAS IISFIIIMIL NTIYEKVAIM ITNFELPRTQ TDYENSLTMK MFLFQF VNY YSSCFYIAFF KGKFVGYPGD PVYLLGKYRS EECDPGGCLL ELTTQLTIIM GGKAIWNNIQ EVLLPWVMNL IGRYKRV SG SEKITPRWEQ DYHLQPMGKL GLFYEYLEMI IQFGFVTLFV ASFPLAPLLA LVNNILEIRV DAWKLTTQFR RMVPEKAQ D IGAWQPIMQG IAILAVVTNA MIIAFTSDMI PRLVYYWSFS IPPYGDHTYY TMDGYINNTL SVFNITDFKN TDKENPYIG LGNYTLCRYR DFRNPPGHPQ EYKHNIYYWH VIAAKLAFII VMEHIIYSVK FFISYAIPDV SKITKSKIKR EKYLTQKLLH ESHLKDLTK NMGIIAERIG GTVDNSVRPK LE

UniProtKB: Anoctamin-6

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Macromolecule #2: CALCIUM ION

MacromoleculeName: CALCIUM ION / type: ligand / ID: 2 / Number of copies: 2 / Formula: CA
Molecular weightTheoretical: 40.078 Da

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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

Concentration1 mg/mL
BufferpH: 7.5
Component:
ConcentrationNameFormula
20.0 mMHEPES
150.0 mMsodium chlorideNaCl
1.0 mMEGTA
2.0 mMcalcium chlorideCaCl2
0.06 %digitonin
GridModel: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 400 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 30 sec. / Pretreatment - Atmosphere: AIR / Pretreatment - Pressure: 101.325 kPa
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277.15 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) / Detector mode: SUPER-RESOLUTION / Number grids imaged: 1 / Number real images: 2505 / Average exposure time: 8.0 sec. / Average electron dose: 48.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 100.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 1261881 / Details: automatically picked particles
Startup modelType of model: EMDB MAP
Final reconstructionNumber classes used: 1 / Applied symmetry - Point group: C2 (2 fold cyclic) / Algorithm: EXACT BACK PROJECTION / Resolution.type: BY AUTHOR / Resolution: 3.5 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION / Number images used: 170824
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION
Final 3D classificationNumber classes: 3 / Software - Name: RELION

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Atomic model buiding 1

Initial modelPDB ID:

6bgi


Chain - Chain ID: A / Chain - Source name: PDB / Chain - Initial model type: experimental model
RefinementSpace: REAL / Protocol: AB INITIO MODEL
Output model

PDB-6p46:
Cryo-EM structure of TMEM16F in digitonin with calcium bound

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