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- PDB-8i6v: Cryo-EM structure of the polyphosphate polymerase VTC complex(Vtc... -
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Open data
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Basic information
Entry | Database: PDB / ID: 8i6v | |||||||||||||||
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Title | Cryo-EM structure of the polyphosphate polymerase VTC complex(Vtc4/Vtc3/Vtc1) | |||||||||||||||
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![]() | MEMBRANE PROTEIN / polyphosphate polymerase / VTC complex / coupled synthesis and translocation | |||||||||||||||
Function / homology | ![]() vacuolar transporter chaperone complex / ATP-polyphosphate phosphotransferase / polyphosphate biosynthetic process / engulfment of target by autophagosome / polyphosphate kinase activity / microautophagy / vacuole fusion, non-autophagic / polyphosphate metabolic process / intracellular phosphate ion homeostasis / inositol hexakisphosphate binding ...vacuolar transporter chaperone complex / ATP-polyphosphate phosphotransferase / polyphosphate biosynthetic process / engulfment of target by autophagosome / polyphosphate kinase activity / microautophagy / vacuole fusion, non-autophagic / polyphosphate metabolic process / intracellular phosphate ion homeostasis / inositol hexakisphosphate binding / vacuolar transport / fungal-type vacuole membrane / vacuolar membrane / autophagosome membrane / cell periphery / cell cortex / cytoplasmic vesicle / nuclear membrane / calmodulin binding / mRNA binding / endoplasmic reticulum membrane / endoplasmic reticulum / membrane Similarity search - Function | |||||||||||||||
Biological species | ![]() ![]() | |||||||||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.06 Å | |||||||||||||||
![]() | Mayer, A. / Wu, S. / Ye, S. | |||||||||||||||
Funding support | ![]()
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![]() | ![]() Title: Cryo-EM structure of the polyphosphate polymerase VTC reveals coupling of polymer synthesis to membrane transit. Authors: Wei Liu / Jiening Wang / Véronique Comte-Miserez / Mengyu Zhang / Xuejing Yu / Qingfeng Chen / Henning Jacob Jessen / Andreas Mayer / Shan Wu / Sheng Ye / ![]() ![]() ![]() Abstract: The eukaryotic vacuolar transporter chaperone (VTC) complex acts as a polyphosphate (polyP) polymerase that synthesizes polyP from adenosine triphosphate (ATP) and translocates polyP across the ...The eukaryotic vacuolar transporter chaperone (VTC) complex acts as a polyphosphate (polyP) polymerase that synthesizes polyP from adenosine triphosphate (ATP) and translocates polyP across the vacuolar membrane to maintain an intracellular phosphate (P ) homeostasis. To discover how the VTC complex performs its function, we determined a cryo-electron microscopy structure of an endogenous VTC complex (Vtc4/Vtc3/Vtc1) purified from Saccharomyces cerevisiae at 3.1 Å resolution. The structure reveals a heteropentameric architecture of one Vtc4, one Vtc3, and three Vtc1 subunits. The transmembrane region forms a polyP-selective channel, likely adopting a resting state conformation, in which a latch-like, horizontal helix of Vtc4 limits the entrance. The catalytic Vtc4 central domain is located on top of the pseudo-symmetric polyP channel, creating a strongly electropositive pathway for nascent polyP that can couple synthesis to translocation. The SPX domain of the catalytic Vtc4 subunit positively regulates polyP synthesis by the VTC complex. The noncatalytic Vtc3 regulates VTC through a phosphorylatable loop. Our findings, along with the functional data, allow us to propose a mechanism of polyP channel gating and VTC complex activation. | |||||||||||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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PDBx/mmCIF format | ![]() | 305.7 KB | Display | ![]() |
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PDB format | ![]() | 240.7 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 478 KB | Display | ![]() |
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Full document | ![]() | 489.7 KB | Display | |
Data in XML | ![]() | 30.5 KB | Display | |
Data in CIF | ![]() | 47.3 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 35208MC M: map data used to model this data C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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Components
-Vacuolar transporter chaperone complex subunit ... , 2 types, 4 molecules ABCE
#1: Protein | Mass: 14388.053 Da / Num. of mol.: 3 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Gene: VTC1, NRF1, PHM4, YER072W / Production host: ![]() ![]() #3: Protein | | Mass: 83268.664 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Gene: VTC4, PHM3, YJL012C, J1345 / Production host: ![]() ![]() References: UniProt: P47075, ATP-polyphosphate phosphotransferase |
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-Protein , 1 types, 1 molecules D
#2: Protein | Mass: 96684.312 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Gene: VTC3, PHM2, YPL019C / Production host: ![]() ![]() |
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-Non-polymers , 5 types, 10 molecules ![](data/chem/img/POV.gif)
![](data/chem/img/PO4.gif)
![](data/chem/img/3PO.gif)
![](data/chem/img/MN.gif)
![](data/chem/img/HOH.gif)
![](data/chem/img/PO4.gif)
![](data/chem/img/3PO.gif)
![](data/chem/img/MN.gif)
![](data/chem/img/HOH.gif)
#4: Chemical | ChemComp-POV / ( | ||||||
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#5: Chemical | #6: Chemical | ChemComp-3PO / | #7: Chemical | ChemComp-MN / | #8: Water | ChemComp-HOH / | |
-Details
Has ligand of interest | Y |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: Cryo-EM structure of the polyphosphate polymerase VTC complex(Vtc4/Vtc3/Vtc1) Type: COMPLEX / Entity ID: #1-#3 / Source: RECOMBINANT |
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Source (natural) | Organism: ![]() ![]() |
Source (recombinant) | Organism: ![]() ![]() |
Buffer solution | pH: 7.4 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 1500 nm / Nominal defocus min: 1000 nm |
Image recording | Electron dose: 54 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) |
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Processing
Software | Name: PHENIX / Version: 1.19.2_4158: / Classification: refinement | ||||||||||||||||||||||||
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
3D reconstruction | Resolution: 3.06 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 1042873 / Symmetry type: POINT | ||||||||||||||||||||||||
Refine LS restraints |
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