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- PDB-6lyg: Cryo-EM structure of the calcium homeostasis modulator 1 channel -

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Basic information

Entry
Database: PDB / ID: 6lyg
TitleCryo-EM structure of the calcium homeostasis modulator 1 channel
ComponentsCalcium homeostasis modulator 1
KeywordsMEMBRANE PROTEIN / Octamer
Function / homologyCalcium homeostasis modulator family / Calcium homeostasis modulator / voltage-gated calcium channel activity / monoatomic cation channel activity / plasma membrane / Calcium homeostasis modulator 1
Function and homology information
Biological speciesDanio rerio (zebrafish)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.1 Å
AuthorsRen, Y. / Yang, X. / Shen, Y.
Funding support China, 5items
OrganizationGrant numberCountry
Ministry of Science and Technology (MoST, China)2017YFA0504801 China
National Natural Science Foundation of China (NSFC)91954119 China
National Natural Science Foundation of China (NSFC)31870736 China
National Natural Science Foundation of China (NSFC)31570750 China
National Natural Science Foundation of China (NSFC)31870834 China
CitationJournal: Sci Adv / Year: 2020
Title: Cryo-EM structure of the calcium homeostasis modulator 1 channel.
Authors: Yue Ren / Tianlei Wen / Zhiqin Xi / Shunjin Li / Jing Lu / Xing Zhang / Xue Yang / Yuequan Shen /
Abstract: Calcium homeostasis modulator 1 (CALHM1) is a voltage-gated ATP release channel that plays an important role in neural gustatory signaling and the pathogenesis of Alzheimer's disease. Here, we ...Calcium homeostasis modulator 1 (CALHM1) is a voltage-gated ATP release channel that plays an important role in neural gustatory signaling and the pathogenesis of Alzheimer's disease. Here, we present a cryo-electron microscopy structure of full-length Ca-free CALHM1 from Danio rerio at an overall resolution of 3.1 Å. Our structure reveals an octameric architecture with a wide pore diameter of ~20 Å, presumably representing the active conformation. The overall structure is substantially different from that of the isoform CALHM2, which forms both undecameric hemichannels and gap junctions. The N-terminal small helix folds back to the pore and forms an antiparallel interaction with transmembrane helix 1. Structural analysis revealed that the extracellular loop 1 region within the dimer interface may contribute to oligomeric assembly. A positive potential belt inside the pore was identified that may modulate ion permeation. Our structure offers insights into the assembly and gating mechanism of the CALHM1 channel.
History
DepositionFeb 14, 2020Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Oct 7, 2020Provider: repository / Type: Initial release

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Structure visualization

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Assembly

Deposited unit
A: Calcium homeostasis modulator 1
B: Calcium homeostasis modulator 1
C: Calcium homeostasis modulator 1
D: Calcium homeostasis modulator 1
E: Calcium homeostasis modulator 1
F: Calcium homeostasis modulator 1
G: Calcium homeostasis modulator 1
H: Calcium homeostasis modulator 1
hetero molecules


Theoretical massNumber of molelcules
Total (without water)331,47916
Polymers329,7098
Non-polymers1,7708
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein
Calcium homeostasis modulator 1


Mass: 41213.645 Da / Num. of mol.: 8
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Danio rerio (zebrafish) / Gene: calhm1 / Cell line (production host): HEK-293S GnTi- / Production host: Homo sapiens (human) / References: UniProt: E7F2J4
#2: Sugar
ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 8
Source method: isolated from a genetically manipulated source
Formula: C8H15NO6
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0
Has ligand of interestN

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: CALHM1 channel / Type: CELL / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Danio rerio (zebrafish)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.5
SpecimenConc.: 8 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 50 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

CTF correctionType: NONE
3D reconstructionResolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 59833 / Symmetry type: POINT
RefinementStereochemistry target values: GeoStd + Monomer Library + CDL v1.2
Displacement parametersBiso mean: 125.59 Å2
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.003715024
ELECTRON MICROSCOPYf_angle_d0.635620352
ELECTRON MICROSCOPYf_chiral_restr0.04082336
ELECTRON MICROSCOPYf_plane_restr0.00772504
ELECTRON MICROSCOPYf_dihedral_angle_d23.30485336

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