[English] 日本語
Yorodumi
- EMDB-0920: Cryo-EM structure of the human CALHM2 -

+
Open data


ID or keywords:

Loading...

-
Basic information

Entry
Database: EMDB / ID: EMD-0920
TitleCryo-EM structure of the human CALHM2
Map data
Sample
  • Complex: CALHM2
    • Protein or peptide: Calcium homeostasis modulator protein 2
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)
Methodsingle 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, 2019-
Header (metadata) releaseJul 29, 2020-
Map releaseJul 29, 2020-
UpdateApr 7, 2021-
Current statusApr 7, 2021Processing site: PDBj / Status: Released

-
Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.023
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by cylindrical radius
  • Surface level: 0.023
  • Imaged by UCSF Chimera
  • Download
  • Surface view with fitted model
  • Atomic models: PDB-6lmu
  • Surface level: 0.023
  • Imaged by UCSF Chimera
  • Download
Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_0920.png

Downloads & links

-
Map

FileDownload / File: emd_0920.map.gz / Format: CCP4 / Size: 26.2 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel sizeX=Y=Z: 1.36172 Å
Density
Contour LevelBy AUTHOR: 0.018 / Movie #1: 0.023
Minimum - Maximum-0.2932772 - 0.3825568
Average (Standard dev.)0.00044489236 (±0.008972858)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions190190190
Spacing190190190
CellA=B=C: 258.7268 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.36172105263161.36172105263161.3617210526316
M x/y/z190190190
origin x/y/z0.0000.0000.000
length x/y/z258.727258.727258.727
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS190190190
D min/max/mean-0.2930.3830.000

-
Supplemental data

-
Mask #1

Fileemd_0920_msk_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

-
Half map: #2

Fileemd_0920_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

-
Half map: #1

Fileemd_0920_half_map_2.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

-
Sample components

-
Entire : CALHM2

EntireName: CALHM2
Components
  • Complex: CALHM2
    • Protein or peptide: Calcium homeostasis modulator protein 2

-
Supramolecule #1: CALHM2

SupramoleculeName: CALHM2 / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Homo sapiens (human)
Recombinant expressionOrganism: Homo sapiens (human)

-
Macromolecule #1: Calcium homeostasis modulator protein 2

MacromoleculeName: Calcium homeostasis modulator protein 2 / type: protein_or_peptide / ID: 1 / Number of copies: 11 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 37.006367 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MAALIAENFR FLSLFFKSKD VMIFNGLVAL GTVGSQELFS VVAFHCPCSP ARNYLYGLAA IGVPALVLFI IGIILNNHTW NLVAECQHR RTKNCSAAPT FLLLSSILGR AAVAPVTWSV ISLLRGEAYV CALSEFVDPS SLTAREEHFP SAHATEILAR F PCKENPDN ...String:
MAALIAENFR FLSLFFKSKD VMIFNGLVAL GTVGSQELFS VVAFHCPCSP ARNYLYGLAA IGVPALVLFI IGIILNNHTW NLVAECQHR RTKNCSAAPT FLLLSSILGR AAVAPVTWSV ISLLRGEAYV CALSEFVDPS SLTAREEHFP SAHATEILAR F PCKENPDN LSDFREEVSR RLRYESQLFG WLLIGVVAIL VFLTKCLKHY CSPLSYRQEA YWAQYRANED QLFQRTAEVH SR VLAANNV RRFFGFVALN KDDEELIANF PVEGTQPRPQ WNAITGVYLY RENQGLPLYS RLHKWAQGLA GNGAAPDNVE MAL LPSENL YFQ

-
Experimental details

-
Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

-
Sample preparation

BufferpH: 8
VitrificationCryogen name: ETHANE

-
Electron microscopy

MicroscopeFEI TITAN KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: OTHER / Imaging mode: BRIGHT FIELDBright-field microscopy
Image recordingFilm or detector model: FEI FALCON III (4k x 4k) / Average electron dose: 60.0 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

-
Image processing

Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 365116
FSC plot (resolution estimation)

+
About Yorodumi

-
News

-
Feb 9, 2022. New format data for meta-information of EMDB entries

New format data for meta-information of EMDB entries

  • Version 3 of the EMDB header file is now the official format.
  • The previous official version 1.9 will be removed from the archive.

Related info.:EMDB header

External links:wwPDB to switch to version 3 of the EMDB data model

-
Aug 12, 2020. Covid-19 info

Covid-19 info

URL: https://pdbj.org/emnavi/covid19.php

New page: Covid-19 featured information page in EM Navigator.

Related info.:Covid-19 info / Mar 5, 2020. Novel coronavirus structure data

+
Mar 5, 2020. Novel coronavirus structure data

Novel coronavirus structure data

Related info.:Yorodumi Speices / Aug 12, 2020. Covid-19 info

External links:COVID-19 featured content - PDBj / Molecule of the Month (242)：Coronavirus Proteases

+
Jan 31, 2019. EMDB accession codes are about to change! (news from PDBe EMDB page)

EMDB accession codes are about to change! (news from PDBe EMDB page)

  • The allocation of 4 digits for EMDB accession codes will soon come to an end. Whilst these codes will remain in use, new EMDB accession codes will include an additional digit and will expand incrementally as the available range of codes is exhausted. The current 4-digit format prefixed with “EMD-” (i.e. EMD-XXXX) will advance to a 5-digit format (i.e. EMD-XXXXX), and so on. It is currently estimated that the 4-digit codes will be depleted around Spring 2019, at which point the 5-digit format will come into force.
  • The EM Navigator/Yorodumi systems omit the EMD- prefix.

Related info.:Q: What is EMD? / ID/Accession-code notation in Yorodumi/EM Navigator

External links:EMDB Accession Codes are Changing Soon! / Contact to PDBj

+
Jul 12, 2017. Major update of PDB

Major update of PDB

  • wwPDB released updated PDB data conforming to the new PDBx/mmCIF dictionary.
  • This is a major update changing the version number from 4 to 5, and with Remediation, in which all the entries are updated.
  • In this update, many items about electron microscopy experimental information are reorganized (e.g. em_software).
  • Now, EM Navigator and Yorodumi are based on the updated data.

External links:wwPDB Remediation / Enriched Model Files Conforming to OneDep Data Standards Now Available in the PDB FTP Archive

-
Yorodumi

Thousand views of thousand structures

  • Yorodumi is a browser for structure data from EMDB, PDB, SASBDB, etc.
  • This page is also the successor to EM Navigator detail page, and also detail information page/front-end page for Omokage search.
  • The word "yorodu" (or yorozu) is an old Japanese word meaning "ten thousand". "mi" (miru) is to see.

Related info.:EMDB / PDB / SASBDB / Comparison of 3 databanks / Yorodumi Search / Aug 31, 2016. New EM Navigator & Yorodumi / Yorodumi Papers / Jmol/JSmol / Function and homology information / Changes in new EM Navigator and Yorodumi

Read more