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- PDB-6lom: Structure of CLHM1 from Caenorhabditis Elegans -

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Basic information

Database: PDB / ID: 6lom
TitleStructure of CLHM1 from Caenorhabditis Elegans
ComponentsCalcium homeostasis modulator protein
KeywordsMEMBRANE PROTEIN / complex
Function / homology
Function and homology information

regulation of locomotion / non-motile cilium / voltage-gated calcium channel activity / regulation of ion transmembrane transport / cation channel activity / calcium ion transmembrane transport / integral component of plasma membrane / plasma membrane
Calcium homeostasis modulator family
Calcium homeostasis modulator protein
Biological speciesCaenorhabditis elegans (roundworm)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.73 Å
AuthorsYang, W.X. / Wang, Y.W. / Zhang, X.C.
Funding support China, 1items
OrganizationGrant numberCountry
National Science Foundation (NSF, China) China
CitationJournal: Protein Sci. / Year: 2020
Title: Cryo-electron microscopy structure of CLHM1 ion channel from Caenorhabditis elegans.
Authors: Weixin Yang / Youwang Wang / Jianli Guo / Lingli He / Ye Zhou / Hui Zheng / Zhenfeng Liu / Ping Zhu / Xuejun C Zhang /
Abstract: Calcium homeostasis modulators (CALHMs/CLHMs) comprise a family of pore-forming protein complexes assembling into voltage-gated, Ca -sensitive, nonselective channels. These complexes contain an ion- ...Calcium homeostasis modulators (CALHMs/CLHMs) comprise a family of pore-forming protein complexes assembling into voltage-gated, Ca -sensitive, nonselective channels. These complexes contain an ion-conduction pore sufficiently wide to permit the passing of ATP molecules serving as neurotransmitters. While their function and structure information is accumulating, the precise mechanisms of these channel complexes remain to be full understood. Here, we present the structure of the Caenorhabditis elegans CLHM1 channel in its open state solved through single-particle cryo-electron microscopy at 3.7-Å resolution. The transmembrane region of the channel structure of the dominant class shows an assembly of 10-fold rotational symmetry in one layer, and its cytoplasmic region is involved in additional twofold symmetrical packing in a tail-to-tail manner. Furthermore, we identified a series of amino acid residues critical for the regulation of CeCLHM1 channel using functional assays, electrophysiological analyses as well as structural-based analysis. Our structure and function analyses provide new insights into the mechanisms of CALHM channels.
Validation Report
SummaryFull reportAbout validation report
DepositionJan 6, 2020Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Jul 29, 2020Provider: repository / Type: Initial release
Revision 1.1Aug 5, 2020Group: Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first / _citation.page_last

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Deposited unit
A: Calcium homeostasis modulator protein
B: Calcium homeostasis modulator protein
C: Calcium homeostasis modulator protein
D: Calcium homeostasis modulator protein
E: Calcium homeostasis modulator protein
F: Calcium homeostasis modulator protein
G: Calcium homeostasis modulator protein
H: Calcium homeostasis modulator protein
I: Calcium homeostasis modulator protein
J: Calcium homeostasis modulator protein
K: Calcium homeostasis modulator protein
L: Calcium homeostasis modulator protein
M: Calcium homeostasis modulator protein
N: Calcium homeostasis modulator protein
O: Calcium homeostasis modulator protein
P: Calcium homeostasis modulator protein
Q: Calcium homeostasis modulator protein
R: Calcium homeostasis modulator protein
S: Calcium homeostasis modulator protein
T: Calcium homeostasis modulator protein

Theoretical massNumber of molelcules
Total (without water)746,17320

TypeNameSymmetry operationNumber
identity operation1_5551
Buried area114780 Å2
ΔGint-1026 kcal/mol
Surface area282170 Å2


#1: Protein
Calcium homeostasis modulator protein / CALHM1-like protein

Mass: 37308.633 Da / Num. of mol.: 20
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Caenorhabditis elegans (roundworm) / Gene: clhm-1, C44B7.4 / Production host: Homo sapiens (human) / References: UniProt: Q18593

Experimental details


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

Sample preparation

ComponentName: predicted: CALHM1-like protein / Type: COMPLEX / Entity ID: 1 / Source: RECOMBINANT
Source (natural)Organism: Caenorhabditis elegans (roundworm)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

Electron microscopy imaging

Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company
MicroscopyModel: FEI TALOS ARCTICA
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy
Image recordingElectron dose: 60 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)


3D reconstructionResolution: 3.73 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 49000 / Symmetry type: POINT

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