sugar/H+ symporter STP10 in outward occluded conformation

Experimental Data Snapshot

  • Resolution: 1.81 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.189 

wwPDB Validation   3D Report Full Report

Ligand Structure Quality Assessment 

This is version 1.2 of the entry. See complete history


Molecular mechanism of sugar transport in plants unveiled by structures of glucose/H + symporter STP10.

Bavnhoj, L.Paulsen, P.A.Flores-Canales, J.C.Schiott, B.Pedersen, B.P.

(2021) Nat Plants 7: 1409-1419

  • DOI: https://doi.org/10.1038/s41477-021-00992-0
  • Primary Citation of Related Structures:  
    7AAQ, 7AAR

  • PubMed Abstract: 

    Sugars are essential sources of energy and carbon and also function as key signalling molecules in plants. Sugar transport proteins (STP) are proton-coupled symporters responsible for uptake of glucose from the apoplast into plant cells. They are integral to organ development in symplastically isolated tissues such as seed, pollen and fruit. Additionally, STPs play a vital role in plant responses to stressors such as dehydration and prevalent fungal infections like rust and mildew. Here we present a structure of Arabidopsis thaliana STP10 in the inward-open conformation at 2.6 Å resolution and a structure of the outward-occluded conformation at improved 1.8 Å resolution, both with glucose and protons bound. The two structures describe key states in the STP transport cycle. Together with molecular dynamics simulations that establish protonation states and biochemical analysis, they pinpoint structural elements, conserved in all STPs, that clarify the basis of proton-to-glucose coupling. These results advance our understanding of monosaccharide uptake, which is essential for plant organ development, and set the stage for bioengineering strategies in crops.

  • Organizational Affiliation

    Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Sugar transport protein 10514Arabidopsis thalianaMutation(s): 0 
Gene Names: STP10At3g19940MPN9.19
Membrane Entity: Yes 
Find proteins for Q9LT15 (Arabidopsis thaliana)
Explore Q9LT15 
Go to UniProtKB:  Q9LT15
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9LT15
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on XPE

Download Ideal Coordinates CCD File 
G [auth A]3,6,9,12,15,18,21,24,27-NONAOXANONACOSANE-1,29-DIOL
C20 H42 O11
Query on OLC

Download Ideal Coordinates CCD File 
C [auth A],
D [auth A],
E [auth A],
F [auth A]
(2R)-2,3-dihydroxypropyl (9Z)-octadec-9-enoate
C21 H40 O4
BGC (Subject of Investigation/LOI)
Query on BGC

Download Ideal Coordinates CCD File 
B [auth A]beta-D-glucopyranose
C6 H12 O6
Query on ACT

Download Ideal Coordinates CCD File 
H [auth A],
I [auth A]
C2 H3 O2
Experimental Data & Validation

Experimental Data

  • Resolution: 1.81 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.189 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.496α = 90
b = 92.78β = 90
c = 119.788γ = 90
Software Package:
Software NamePurpose
DIALSdata reduction
Aimlessdata scaling
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report

Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
European Research Council (ERC)Denmark637372
The Carlsberg FoundationDenmarkCF17-0180
Danish Council for Independent ResearchDenmarkDFF-4002-00052

Revision History  (Full details and data files)

  • Version 1.0: 2021-08-18
    Type: Initial release
  • Version 1.1: 2021-11-03
    Changes: Data collection, Database references
  • Version 1.2: 2024-01-31
    Changes: Data collection, Refinement description