3M74

Crystal Structure of Plant SLAC1 homolog TehA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.170 
  • R-Value Work: 0.144 
  • R-Value Observed: 0.145 

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Ligand Structure Quality Assessment 


This is version 1.5 of the entry. See complete history


Literature

Homologue structure of the SLAC1 anion channel for closing stomata in leaves.

Chen, Y.H.Hu, L.Punta, M.Bruni, R.Hillerich, B.Kloss, B.Rost, B.Love, J.Siegelbaum, S.A.Hendrickson, W.A.

(2010) Nature 467: 1074-1080

  • DOI: https://doi.org/10.1038/nature09487
  • Primary Citation of Related Structures:  
    3M71, 3M73, 3M74, 3M75, 3M76, 3M7L

  • PubMed Abstract: 

    The plant SLAC1 anion channel controls turgor pressure in the aperture-defining guard cells of plant stomata, thereby regulating the exchange of water vapour and photosynthetic gases in response to environmental signals such as drought or high levels of carbon dioxide. Here we determine the crystal structure of a bacterial homologue (Haemophilus influenzae) of SLAC1 at 1.20 Å resolution, and use structure-inspired mutagenesis to analyse the conductance properties of SLAC1 channels. SLAC1 is a symmetrical trimer composed from quasi-symmetrical subunits, each having ten transmembrane helices arranged from helical hairpin pairs to form a central five-helix transmembrane pore that is gated by an extremely conserved phenylalanine residue. Conformational features indicate a mechanism for control of gating by kinase activation, and electrostatic features of the pore coupled with electrophysiological characteristics indicate that selectivity among different anions is largely a function of the energetic cost of ion dehydration.


  • Organizational Affiliation

    Department of Biochemistry and Molecular Biophysics, Columbia University, New York, New York 10032, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Tellurite resistance protein tehA homolog314Haemophilus influenzaeMutation(s): 1 
Gene Names: HI0511RdtehA
Membrane Entity: Yes 
UniProt
Find proteins for P44741 (Haemophilus influenzae (strain ATCC 51907 / DSM 11121 / KW20 / Rd))
Explore P44741 
Go to UniProtKB:  P44741
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP44741
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.170 
  • R-Value Work: 0.144 
  • R-Value Observed: 0.145 
  • Space Group: H 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 96.072α = 90
b = 96.072β = 90
c = 136.037γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-05-12
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-11-08
    Changes: Refinement description
  • Version 1.3: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary
  • Version 1.4: 2021-10-06
    Changes: Database references, Structure summary
  • Version 1.5: 2024-02-21
    Changes: Data collection