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- EMDB-30400: Cryo-EM structure of human NALCN in complex with FAM155A -

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Basic information

Entry
Database: EMDB / ID: EMD-30400
TitleCryo-EM structure of human NALCN in complex with FAM155A
Map dataMain map
Sample
  • Complex: Binary complex of human NALCN with FAM155A
    • Protein or peptide: Sodium leak channel non-selective protein
    • Protein or peptide: Transmembrane protein FAM155A
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: 1,2-DIACYL-SN-GLYCERO-3-PHOSPHOCHOLINE
Function / homology
Function and homology information


positive regulation of synaptic transmission, cholinergic / leak channel activity / regulation of resting membrane potential / voltage-gated sodium channel activity / sodium channel activity / monoatomic ion channel complex / calcium ion import across plasma membrane / sodium ion transmembrane transport / monoatomic cation channel activity / potassium ion transmembrane transport ...positive regulation of synaptic transmission, cholinergic / leak channel activity / regulation of resting membrane potential / voltage-gated sodium channel activity / sodium channel activity / monoatomic ion channel complex / calcium ion import across plasma membrane / sodium ion transmembrane transport / monoatomic cation channel activity / potassium ion transmembrane transport / positive regulation of synaptic transmission, GABAergic / calcium ion transmembrane transport / Stimuli-sensing channels / monoatomic ion transmembrane transport / plasma membrane
Similarity search - Function
Sodium leak channel NALCN / Voltage-dependent channel domain superfamily / Ion transport domain / Ion transport protein
Similarity search - Domain/homology
NALCN channel auxiliary factor 1 / Sodium leak channel NALCN
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.1 Å
AuthorsWu J / Yan Z / Ke M
CitationJournal: Nat Commun / Year: 2020
Title: Structure of the human sodium leak channel NALCN in complex with FAM155A.
Authors: Jiongfang Xie / Meng Ke / Lizhen Xu / Shiyi Lin / Jin Huang / Jiabei Zhang / Fan Yang / Jianping Wu / Zhen Yan /
Abstract: NALCN, a sodium leak channel expressed mainly in the central nervous system, is responsible for the resting Na permeability that controls neuronal excitability. Dysfunctions of the NALCN ...NALCN, a sodium leak channel expressed mainly in the central nervous system, is responsible for the resting Na permeability that controls neuronal excitability. Dysfunctions of the NALCN channelosome, NALCN with several auxiliary subunits, are associated with a variety of human diseases. Here, we report the cryo-EM structure of human NALCN in complex with FAM155A at an overall resolution of 3.1 angstroms. FAM155A forms extensive interactions with the extracellular loops of NALCN that may help stabilize NALCN in the membrane. A Na ion-binding site, reminiscent of a Ca binding site in Ca channels, is identified in the unique EEKE selectivity filter. Despite its 'leaky' nature, the channel is closed and the intracellular gate is sealed by S6, II-III linker and III-IV linker. Our study establishes the molecular basis of Na permeation and voltage sensitivity, and provides important clues to the mechanistic understanding of NALCN regulation and NALCN channelosome-related diseases.
History
DepositionJul 24, 2020-
Header (metadata) releaseNov 11, 2020-
Map releaseNov 11, 2020-
UpdateDec 9, 2020-
Current statusDec 9, 2020Processing site: PDBj / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.7
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by height
  • Surface level: 0.7
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-7cm3
  • Surface level: 0.7
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_30400.png

Downloads & links

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Map

FileDownload / File: emd_30400.map.gz / Format: CCP4 / Size: 52.7 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationMain map
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.09 Å/pix.
x 240 pix.
= 260.88 Å		1.09 Å/pix.
x 240 pix.
= 260.88 Å		1.09 Å/pix.
x 240 pix.
= 260.88 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.087 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.7 / Movie #1: 0.7
Minimum - Maximum-2.1528728 - 4.067413
Average (Standard dev.)0.0116682965 (±0.09568999)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions240240240
Spacing240240240
CellA=B=C: 260.88 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.0871.0871.087
M x/y/z240240240
origin x/y/z0.0000.0000.000
length x/y/z260.880260.880260.880
α/β/γ90.00090.00090.000
start NX/NY/NZ107107101
NX/NY/NZ267267267
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS240240240
D min/max/mean-2.1534.0670.012

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Supplemental data

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Additional map: Extracellular region

Fileemd_30400_additional_1.map
AnnotationExtracellular region
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Additional map: Intracellular region

Fileemd_30400_additional_2.map
AnnotationIntracellular region
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: half map1

Fileemd_30400_half_map_1.map
Annotationhalf map1
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: halp map2

Fileemd_30400_half_map_2.map
Annotationhalp map2
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Binary complex of human NALCN with FAM155A

EntireName: Binary complex of human NALCN with FAM155A
Components
  • Complex: Binary complex of human NALCN with FAM155A
    • Protein or peptide: Sodium leak channel non-selective protein
    • Protein or peptide: Transmembrane protein FAM155A
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: 1,2-DIACYL-SN-GLYCERO-3-PHOSPHOCHOLINE

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Supramolecule #1: Binary complex of human NALCN with FAM155A

SupramoleculeName: Binary complex of human NALCN with FAM155A / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#2
Source (natural)Organism: Homo sapiens (human)
Recombinant expressionOrganism: Homo sapiens (human)

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Macromolecule #1: Sodium leak channel non-selective protein

MacromoleculeName: Sodium leak channel non-selective protein / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 203.616953 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MLKRKQSSRV EAQPVTDFGP DESLSDNADI LWINKPWVHS LLRICAIISV ISVCMNTPMT FEHYPPLQYV TFTLDTLLMF LYTAEMIAK MHIRGIVKGD SSYVKDRWCV FDGFMVFCLW VSLVLQVFEI ADIVDQMSPW GMLRIPRPLI MIRAFRIYFR F ELPRTRIT ...String:
MLKRKQSSRV EAQPVTDFGP DESLSDNADI LWINKPWVHS LLRICAIISV ISVCMNTPMT FEHYPPLQYV TFTLDTLLMF LYTAEMIAK MHIRGIVKGD SSYVKDRWCV FDGFMVFCLW VSLVLQVFEI ADIVDQMSPW GMLRIPRPLI MIRAFRIYFR F ELPRTRIT NILKRSGEQI WSVSIFLLFF LLLYGILGVQ MFGTFTYHCV VNDTKPGNVT WNSLAIPDTH CSPELEEGYQ CP PGFKCMD LEDLGLSRQE LGYSGFNEIG TSIFTVYEAA SQEGWVFLMY RAIDSFPRWR SYFYFITLIF FLAWLVKNVF IAV IIETFA EIRVQFQQMW GSRSSTTSTA TTQMFHEDAA GGWQLVAVDV NKPQGRAPAC LQKMMRSSVF HMFILSMVTV DVIV AASNY YKGENFRRQY DEFYLAEVAF TVLFDLEALL KIWCLGFTGY ISSSLHKFEL LLVIGTTLHV YPDLYHSQFT YFQVL RVVR LIKISPALED FVYKIFGPGK KLGSLVVFTA SLLIVMSAIS LQMFCFVEEL DRFTTFPRAF MSMFQILTQE GWVDVM DQT LNAVGHMWAP VVAIYFILYH LFATLILLSL FVAVILDNLE LDEDLKKLKQ LKQSEANADT KEKLPLRLRI FEKFPNR PQ MVKISKLPSD FTVPKIRESF MKQFIDRQQQ DTCCLLRSLP TTSSSSCDHS KRSAIEDNKY IDQKLRKSVF SIRARNLL E KETAVTKILR ACTRQRMLSG SFEGQPAKER SILSVQHHIR QERRSLRHGS NSQRISRGKS LETLTQDHSN TVRYRNAQR EDSEIKMIQE KKEQAEMKRK VQEEELRENH PYFDKPLFIV GREHRFRNFC RVVVRARFNA SKTDPVTGAV KNTKYHQLYD LLGLVTYLD WVMIIVTICS CISMMFESPF RRVMHAPTLQ IAEYVFVIFM SIELNLKIMA DGLFFTPTAV IRDFGGVMDI F IYLVSLIF LCWMPQNVPA ESGAQLLMVL RCLRPLRIFK LVPQMRKVVR ELFSGFKEIF LVSILLLTLM LVFASFGVQL FA GKLAKCN DPNIIRREDC NGIFRINVSV SKNLNLKLRP GEKKPGFWVP RVWANPRNFN FDNVGNAMLA LFEVLSLKGW VEV RDVIIH RVGPIHGIYI HVFVFLGCMI GLTLFVGVVI ANFNENKGTA LLTVDQRRWE DLKSRLKIAQ PLHLPPRPDN DGFR AKMYD ITQHPFFKRT IALLVLAQSV LLSVKWDVED PVTVPLATMS VVFTFIFVLE VTMKIIAMSP AGFWQSRRNR YDLLV TSLG VVWVVLHFAL LNAYTYMMGA CVIVFRFFSI CGKHVTLKML LLTVVVSMYK SFFIIVGMFL LLLCYAFAGV VLFGTV KYG ENINRHANFS SAGKAITVLF RIVTGEDWNK IMHDCMVQPP FCTPDEFTYW ATDCGNYAGA LMYFCSFYVI IAYIMLN LL VAIIVENFSL FYSTEEDQLL SYNDLRHFQI IWNMVDDKRE GVIPTFRVKF LLRLLRGRLE VDLDKDKLLF KHMCYEME R LHNGGDVTFH DVLSMLSYRS VDIRKSLQLE ELLAREQLEY TIEEEVAKQT IRMWLKKCLK RIRAKQQQSC SIIHSLRES QQQELSRFLN PPSIETTQPS EDTNANSQDN SMQPETSSQQ QLLSPTLSDR GGSRQDAADA GKPQRKFGQW RLPSAPKPIS HSVSSVNLR FGGRTTMKSV VCKMNPMTDA ASCGSEVKKW WTRQLTVESD ESGDDLLDIL EDEVDAGSDY KDDDDKGSDY K DDDDK

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Macromolecule #2: Transmembrane protein FAM155A

MacromoleculeName: Transmembrane protein FAM155A / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 54.604438 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MTRGAWMCRQ YDDGLKIWLA APRENEKPFI DSERAQKWRL SLASLLFFTV LLSDHLWFCA EAKLTRARDK EHQQQQRQQQ QQQQQQRQR QQQQQQRRQQ EPSWPALLAS MGESSPAAQA HRLLSASSSP TLPPSPGDGG GGGGKGNRGK DDRGKALFLG N SAKPVWRL ...String:
MTRGAWMCRQ YDDGLKIWLA APRENEKPFI DSERAQKWRL SLASLLFFTV LLSDHLWFCA EAKLTRARDK EHQQQQRQQQ QQQQQQRQR QQQQQQRRQQ EPSWPALLAS MGESSPAAQA HRLLSASSSP TLPPSPGDGG GGGGKGNRGK DDRGKALFLG N SAKPVWRL ETCYPQGASS GQCFTVENAD AVCARNWSRG AAGGDGQEVR SKHPTPLWNL SDFYLSFCNS YTLWELFSGL SS PNTLNCS LDVVLKEGGE MTTCRQCVEA YQDYDHHAQE KYEEFESVLH KYLQSEEYSV KSCPEDCKIV YKAWLCSQYF EVT QFNCRK TIPCKQYCLE VQTRCPFILP DNDEVIYGGL SSFICTGLYE TFLTNDEPEC CDVRREEKSN NPSKGTVEKS GSCH RTSLT VSSATRLCNS RLKLCVLVLI LLHTVLTASA AQNTAGLSFG GINTLEENST NEELEDEVDA GSDYKDDDDK GSDYK DDDD K

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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: 2 / 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: 1,2-DIACYL-SN-GLYCERO-3-PHOSPHOCHOLINE

MacromoleculeName: 1,2-DIACYL-SN-GLYCERO-3-PHOSPHOCHOLINE / type: ligand / ID: 6 / Number of copies: 10 / Formula: PC1
Molecular weightTheoretical: 790.145 Da
Chemical component information

ChemComp-PC1:
1,2-DIACYL-SN-GLYCERO-3-PHOSPHOCHOLINE / phospholipid*YM

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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 / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 (6k 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

Startup modelType of model: NONE / Details: Ab Initio
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 65177
Initial angle assignmentType: RANDOM ASSIGNMENT
Final angle assignmentType: MAXIMUM LIKELIHOOD

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