[English] 日本語
![](img/lk-miru.gif)
- EMDB-36721: Structure of TbAQP2 in complex with anti-trypanosomatid drug mela... -
+
Open data
-
Basic information
Entry | ![]() | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
Title | Structure of TbAQP2 in complex with anti-trypanosomatid drug melarsoprol | |||||||||
![]() | ||||||||||
![]() |
| |||||||||
![]() | Aquaporin / MEMBRANE PROTEIN | |||||||||
Function / homology | : / glycerol channel activity / urea transmembrane transporter activity / water channel activity / Major intrinsic protein / Major intrinsic protein / Aquaporin-like / plasma membrane / Aquaglyceroporin-2![]() | |||||||||
Biological species | ![]() ![]() ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 2.5 Å | |||||||||
![]() | Chen W / Wang C | |||||||||
Funding support | ![]()
| |||||||||
![]() | ![]() Title: Structural insights into drug transport by an aquaglyceroporin. Authors: Wanbiao Chen / Rongfeng Zou / Yi Mei / Jiawei Li / Yumi Xuan / Bing Cui / Junjie Zou / Juncheng Wang / Shaoquan Lin / Zhe Zhang / Chongyuan Wang / ![]() Abstract: Pentamidine and melarsoprol are primary drugs used to treat the lethal human sleeping sickness caused by the parasite Trypanosoma brucei. Cross-resistance to these two drugs has recently been linked ...Pentamidine and melarsoprol are primary drugs used to treat the lethal human sleeping sickness caused by the parasite Trypanosoma brucei. Cross-resistance to these two drugs has recently been linked to aquaglyceroporin 2 of the trypanosome (TbAQP2). TbAQP2 is the first member of the aquaporin family described as capable of drug transport; however, the underlying mechanism remains unclear. Here, we present cryo-electron microscopy structures of TbAQP2 bound to pentamidine or melarsoprol. Our structural studies, together with the molecular dynamic simulations, reveal the mechanisms shaping substrate specificity and drug permeation. Multiple amino acids in TbAQP2, near the extracellular entrance and inside the pore, create an expanded conducting tunnel, sterically and energetically allowing the permeation of pentamidine and melarsoprol. Our study elucidates the mechanism of drug transport by TbAQP2, providing valuable insights to inform the design of drugs against trypanosomiasis. | |||||||||
History |
|
-
Structure visualization
Supplemental images |
---|
-
Downloads & links
-EMDB archive
Map data | ![]() | 59.8 MB | ![]() | |
---|---|---|---|---|
Header (meta data) | ![]() ![]() | 15.2 KB 15.2 KB | Display Display | ![]() |
Images | ![]() | 131.7 KB | ||
Filedesc metadata | ![]() | 5.9 KB | ||
Others | ![]() ![]() | 58.3 MB 58.4 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 8jy6MC ![]() 8jy7C ![]() 8jy8C M: atomic model generated by this map C: citing same article ( |
---|---|
Similar structure data | Similarity search - Function & homology ![]() |
-
Links
EMDB pages | ![]() ![]() |
---|---|
Related items in Molecule of the Month |
-
Map
File | ![]() | ||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Voxel size | X=Y=Z: 1.064 Å | ||||||||||||||||||||
Density |
| ||||||||||||||||||||
Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
|
-Supplemental data
-Half map: Author stated: The maps were generate from non-uniform...
File | emd_36721_half_map_1.map | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Annotation | Author stated: The maps were generate from non-uniform refinement in cryosparc, an algorithm based on cross-validation optimization, which automatically regularizes 3D density maps during refinement to account for spatial variability. Unlike common shift-invariant regularizers, non-uniform refinement systematically removes noise from disordered regions, while retaining signal useful for aligning particle images, yielding dramatically improved resolution and 3D map quality in many cases (Nature methods 17.12 (2020): 1214-1221; https://www.nature.com/articles/s41592-020-00990-8). That is why the raw maps look like filtered. | ||||||||||||
Projections & Slices |
| ||||||||||||
Density Histograms |
-Half map: #1
File | emd_36721_half_map_2.map | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Projections & Slices |
| ||||||||||||
Density Histograms |
-
Sample components
-Entire : TbAQP2 complex with melarsorpol
Entire | Name: TbAQP2 complex with melarsorpol |
---|---|
Components |
|
-Supramolecule #1: TbAQP2 complex with melarsorpol
Supramolecule | Name: TbAQP2 complex with melarsorpol / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1 |
---|---|
Source (natural) | Organism: ![]() |
-Macromolecule #1: Aquaglyceroporin 2
Macromolecule | Name: Aquaglyceroporin 2 / type: protein_or_peptide / ID: 1 Details: Author stated: Residues from 313 to 343 are twin-strep tags for affinity purification. Number of copies: 4 / Enantiomer: LEVO |
---|---|
Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 36.775914 KDa |
Recombinant expression | Organism: ![]() |
Sequence | String: MQSQPDNVAY PMELQAVNKD GTVEVRVQGN VDNSSNERWD ADVQKHEVAE AQEKPVGGIN FWAPRELRLN YRDYVAEFLG NFVLIYIAK GAVITSLLVP DFGLLGLTIG IGVAVTMALY VSLGISGGHL NSAVTVGNAV FGDFPWRKVP GYIAAQMLGT F LGAACAYG ...String: MQSQPDNVAY PMELQAVNKD GTVEVRVQGN VDNSSNERWD ADVQKHEVAE AQEKPVGGIN FWAPRELRLN YRDYVAEFLG NFVLIYIAK GAVITSLLVP DFGLLGLTIG IGVAVTMALY VSLGISGGHL NSAVTVGNAV FGDFPWRKVP GYIAAQMLGT F LGAACAYG VFADLLKAHG GGELIAFGEK GIAWVFAMYP AEGNGIFYPI FAELISTAVL LLCVCGIFDP NNSPAKGYET VA IGALVFV MVNNFGLASP LAMNPSLDFG PRVFGAILLG GEVFSHANYY FWVPLVVPFF GAILGLFLYK YFLPHSNSWS HPQ FEKGGG SGGGSGGSAW SHPQFEK UniProtKB: Aquaglyceroporin-2 |
-Macromolecule #2: [(4~{R})-2-[4-[[4,6-bis(azanyl)-1,3,5-triazin-2-yl]amino]phenyl]-...
Macromolecule | Name: [(4~{R})-2-[4-[[4,6-bis(azanyl)-1,3,5-triazin-2-yl]amino]phenyl]-1,3,2-dithiarsolan-4-yl]methanol type: ligand / ID: 2 / Number of copies: 4 / Formula: L1U |
---|---|
Molecular weight | Theoretical: 398.339 Da |
-Experimental details
-Structure determination
Method | cryo EM |
---|---|
![]() | single particle reconstruction |
Aggregation state | particle |
-
Sample preparation
Buffer | pH: 7.5 |
---|---|
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % |
-
Electron microscopy
Microscope | FEI TITAN KRIOS |
---|---|
Image recording | Film or detector model: GATAN K3 (6k x 4k) / Average electron dose: 71.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 3.0 µm / Nominal defocus min: 0.8 µm |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
-
Image processing
Startup model | Type of model: OTHER |
---|---|
Final reconstruction | Resolution.type: BY AUTHOR / Resolution: 2.5 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. v2) / Number images used: 379082 |
Initial angle assignment | Type: ANGULAR RECONSTITUTION / Software - Name: cryoSPARC (ver. V2) |
Final angle assignment | Type: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. V2) |