Crystal Structure of Arabidopsis thaliana Bor1

Experimental Data Snapshot

  • Resolution: 4.11 Å
  • R-Value Free: 0.391 
  • R-Value Work: 0.359 
  • R-Value Observed: 0.360 

Starting Model: experimental
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Structure of Bor1 supports an elevator transport mechanism for SLC4 anion exchangers.

Thurtle-Schmidt, B.H.Stroud, R.M.

(2016) Proc Natl Acad Sci U S A 113: 10542-10546

  • DOI: https://doi.org/10.1073/pnas.1612603113
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Boron is essential for plant growth because of its incorporation into plant cell walls; however, in excess it is toxic to plants. Boron transport and homeostasis in plants is regulated in part by the borate efflux transporter Bor1, a member of the solute carrier (SLC) 4 transporter family with homology to the human bicarbonate transporter Band 3. Here, we present the 4.1-Å resolution crystal structure of Arabidopsis thaliana Bor1. The structure displays a dimeric architecture in which dimerization is mediated by centralized Gate domains. Comparisons with a structure of Band 3 in an outward-open state reveal that the Core domains of Bor1 have rotated inwards to achieve an occluded state. Further structural comparisons with UapA, a xanthine transporter from the nucleobase-ascorbate transporter family, show that the downward pivoting of the Core domains relative to the Gate domains may access an inward-open state. These results suggest that the SLC4, SLC26, and nucleobase-ascorbate transporter families all share an elevator transport mechanism in which alternating access is provided by Core domains that carry substrates across a membrane.

  • Organizational Affiliation

    Department of Biochemistry and Biophysics, University of California, San Francisco, CA 94158.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Boron transporter 1652Arabidopsis thalianaMutation(s): 0 
Gene Names: BOR1At2g47160T3D7.3
Membrane Entity: Yes 
Find proteins for Q8VYR7 (Arabidopsis thaliana)
Explore Q8VYR7 
Go to UniProtKB:  Q8VYR7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8VYR7
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 4.11 Å
  • R-Value Free: 0.391 
  • R-Value Work: 0.359 
  • R-Value Observed: 0.360 
  • Space Group: P 42 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 184.557α = 90
b = 184.557β = 90
c = 89.826γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM024485

Revision History  (Full details and data files)

  • Version 1.0: 2016-09-14
    Type: Initial release
  • Version 1.1: 2016-10-05
    Changes: Database references
  • Version 1.2: 2017-09-27
    Changes: Author supporting evidence, Database references, Derived calculations
  • Version 1.3: 2019-12-25
    Changes: Author supporting evidence
  • Version 1.4: 2023-10-04
    Changes: Data collection, Database references, Refinement description