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- PDB-6lmu: Cryo-EM structure of the human CALHM2 -

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Basic information

Entry
Database: PDB / ID: 6lmu
TitleCryo-EM structure of the human CALHM2
ComponentsCalcium homeostasis modulator protein 2
KeywordsMEMBRANE PROTEIN / channel
Function / homologyCalcium homeostasis modulator family / Calcium homeostasis modulator / monoatomic cation channel activity / positive regulation of apoptotic process / membrane / Calcium homeostasis modulator protein 2
Function and homology information
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.4 Å
AuthorsDemura, K. / Kusakizako, T. / Shihoya, W. / Hiraizumi, M. / Shimada, H. / Yamashita, K. / Nishizawa, T. / Nureki, O.
CitationJournal: Sci Adv / Year: 2020
Title: Cryo-EM structures of calcium homeostasis modulator channels in diverse oligomeric assemblies.
Authors: Kanae Demura / Tsukasa Kusakizako / Wataru Shihoya / Masahiro Hiraizumi / Kengo Nomura / Hiroto Shimada / Keitaro Yamashita / Tomohiro Nishizawa / Akiyuki Taruno / Osamu Nureki /
Abstract: Calcium homeostasis modulator (CALHM) family proteins are Ca-regulated adenosine triphosphate (ATP)-release channels involved in neural functions including neurotransmission in gustation. Here, we ...Calcium homeostasis modulator (CALHM) family proteins are Ca-regulated adenosine triphosphate (ATP)-release channels involved in neural functions including neurotransmission in gustation. Here, we present the cryo-electron microscopy (EM) structures of killifish CALHM1, human CALHM2, and CLHM-1 at resolutions of 2.66, 3.4, and 3.6 Å, respectively. The CALHM1 octamer structure reveals that the N-terminal helix forms the constriction site at the channel pore in the open state and modulates the ATP conductance. The CALHM2 undecamer and CLHM-1 nonamer structures show the different oligomeric stoichiometries among CALHM homologs. We further report the cryo-EM structures of the chimeric construct, revealing that the intersubunit interactions at the transmembrane domain (TMD) and the TMD-intracellular domain linker define the oligomeric stoichiometry. These findings advance our understanding of the ATP conduction and oligomerization mechanisms of CALHM channels.
History
DepositionDec 26, 2019Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Jul 29, 2020Provider: repository / Type: Initial release
Revision 1.1Sep 9, 2020Group: Database references / Category: citation / citation_author
Item: _citation.page_first / _citation.page_last ..._citation.page_first / _citation.page_last / _citation.pdbx_database_id_PubMed / _citation.title / _citation_author.identifier_ORCID

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Structure visualization

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Assembly

Deposited unit
A: Calcium homeostasis modulator protein 2
B: Calcium homeostasis modulator protein 2
C: Calcium homeostasis modulator protein 2
D: Calcium homeostasis modulator protein 2
E: Calcium homeostasis modulator protein 2
F: Calcium homeostasis modulator protein 2
G: Calcium homeostasis modulator protein 2
H: Calcium homeostasis modulator protein 2
I: Calcium homeostasis modulator protein 2
J: Calcium homeostasis modulator protein 2
K: Calcium homeostasis modulator protein 2


Theoretical massNumber of molelcules
Total (without water)407,07011
Polymers407,07011
Non-polymers00
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: microscopy
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area59920 Å2
ΔGint-432 kcal/mol
Surface area138780 Å2

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Components

#1: Protein
Calcium homeostasis modulator protein 2 / Protein FAM26B


Mass: 37006.367 Da / Num. of mol.: 11
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CALHM2, FAM26B / Production host: Homo sapiens (human) / References: UniProt: Q9HA72

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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: CALHM2 / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen 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: OTHER
Electron lensMode: BRIGHT FIELDBright-field microscopy
Image recordingElectron dose: 60 e/Å2 / Film or detector model: FEI FALCON III (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.14_3260: / Classification: refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 365116 / Symmetry type: POINT

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