+Open data
-Basic information
Entry | Database: PDB / ID: 7n7p | ||||||
---|---|---|---|---|---|---|---|
Title | Cryo-EM structure of human TMEM120A | ||||||
Components | Ion channel TACAN | ||||||
Keywords | MEMBRANE PROTEIN / Transmembrane protein | ||||||
Function / homology | Function and homology information protein heterooligomerization / nuclear inner membrane / fat cell differentiation / detection of mechanical stimulus involved in sensory perception of pain / monoatomic ion channel activity / protein homooligomerization / monoatomic ion transmembrane transport / membrane / plasma membrane Similarity search - Function | ||||||
Biological species | Homo sapiens (human) | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.24 Å | ||||||
Authors | Xue, J. / Han, Y. / Jiang, Y. | ||||||
Funding support | United States, 1items
| ||||||
Citation | Journal: Elife / Year: 2021 Title: TMEM120A is a coenzyme A-binding membrane protein with structural similarities to ELOVL fatty acid elongase. Authors: Jing Xue / Yan Han / Hamid Baniasadi / Weizhong Zeng / Jimin Pei / Nick V Grishin / Junmei Wang / Benjamin P Tu / Youxing Jiang / Abstract: TMEM120A, also named as TACAN, is a novel membrane protein highly conserved in vertebrates and was recently proposed to be a mechanosensitive channel involved in sensing mechanical pain. Here we ...TMEM120A, also named as TACAN, is a novel membrane protein highly conserved in vertebrates and was recently proposed to be a mechanosensitive channel involved in sensing mechanical pain. Here we present the single-particle cryogenic electron microscopy (cryo-EM) structure of human TMEM120A, which forms a tightly packed dimer with extensive interactions mediated by the N-terminal coiled coil domain (CCD), the C-terminal transmembrane domain (TMD), and the re-entrant loop between the two domains. The TMD of each TMEM120A subunit contains six transmembrane helices (TMs) and has no clear structural feature of a channel protein. Instead, the six TMs form an α-barrel with a deep pocket where a coenzyme A (CoA) molecule is bound. Intriguingly, some structural features of TMEM120A resemble those of elongase for very long-chain fatty acids (ELOVL) despite the low sequence homology between them, pointing to the possibility that TMEM120A may function as an enzyme for fatty acid metabolism, rather than a mechanosensitive channel. | ||||||
History |
|
-Structure visualization
Movie |
Movie viewer |
---|---|
Structure viewer | Molecule: MolmilJmol/JSmol |
-Downloads & links
-Download
PDBx/mmCIF format | 7n7p.cif.gz | 126.6 KB | Display | PDBx/mmCIF format |
---|---|---|---|---|
PDB format | pdb7n7p.ent.gz | 99.2 KB | Display | PDB format |
PDBx/mmJSON format | 7n7p.json.gz | Tree view | PDBx/mmJSON format | |
Others | Other downloads |
-Validation report
Summary document | 7n7p_validation.pdf.gz | 1 MB | Display | wwPDB validaton report |
---|---|---|---|---|
Full document | 7n7p_full_validation.pdf.gz | 1 MB | Display | |
Data in XML | 7n7p_validation.xml.gz | 24.8 KB | Display | |
Data in CIF | 7n7p_validation.cif.gz | 32.2 KB | Display | |
Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/n7/7n7p ftp://data.pdbj.org/pub/pdb/validation_reports/n7/7n7p | HTTPS FTP |
-Related structure data
Related structure data | 24230MC M: map data used to model this data C: citing same article (ref.) |
---|---|
Similar structure data |
-Links
-Assembly
Deposited unit |
|
---|---|
1 |
|
-Components
#1: Protein | Mass: 42013.457 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) Homo sapiens (human) / Gene: TMEM120A, TACAN, TMPIT / Production host: Homo sapiens (human) / References: UniProt: Q9BXJ8 #2: Chemical | Has ligand of interest | Y | |
---|
-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
---|---|
EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
-Sample preparation
Component | Name: Human TMEM120A with CoA / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT |
---|---|
Source (natural) | Organism: Homo sapiens (human) |
Source (recombinant) | Organism: Homo sapiens (human) |
Buffer solution | pH: 7.4 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE |
-Electron microscopy imaging
Experimental equipment | Model: Titan Krios / Image courtesy: FEI Company |
---|---|
Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM |
Electron lens | Mode: BRIGHT FIELD |
Image recording | Electron dose: 1 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) |
-Processing
CTF correction | Type: PHASE FLIPPING ONLY |
---|---|
3D reconstruction | Resolution: 3.24 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 701283 / Symmetry type: POINT |