Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction | Predict Membrane 

Global Symmetry: Cyclic - C3  (3D View)
Global Stoichiometry: Homo 3-mer - A3 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 36.42 kDa 
• Atom Count: 2898 
• Modelled Residue Count: 308 
• Deposited Residue Count: 314 
• Unique protein chains: 1

3M71

Crystal Structure of Plant SLAC1 homolog TehA

• PDB DOI: 10.2210/pdb3M71/pdb

• Classification: STRUCTURAL GENOMICS, UNKNOWN FUNCTION
• Organism(s): Haemophilus influenzae
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 
• Membrane Protein: Yes  PDBTMMemProtMDmpstruc


• Deposited: 2010-03-16 Released: 2010-05-12 
• Deposition Author(s): Chen, Y.-H., Hu, L., Punta, M., Bruni, R., Hillerich, B., Kloss, B., Rost, B., Love, J., Siegelbaum, S.A., Hendrickson, W.A., New York Consortium on Membrane Protein Structure (NYCOMPS)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.20 Å
• R-Value Free: 0.160 
• R-Value Work: 0.141 
• R-Value Observed: 0.142 

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

• PubMed: 20981093 
• DOI: 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.

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Organizational Affiliation: 

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

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Tellurite resistance protein tehA homolog	A	314	Haemophilus influenzae	Mutation(s): 0  Gene Names: HI0511, Rd, tehA Membrane Entity: Yes
UniProt
Find proteins for P44741 (Haemophilus influenzae (strain ATCC 51907 / DSM 11121 / KW20 / Rd)) Explore P44741  Go to UniProtKB:  P44741

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
BOG	B [auth A], C [auth A], D [auth A], E [auth A]	octyl beta-D-glucopyranoside C14 H28 O6 HEGSGKPQLMEBJL-RKQHYHRCSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.20 Å
• R-Value Free: 0.160 
• R-Value Work: 0.141 
• R-Value Observed: 0.142 
• Space Group: H 3

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 96.012	α = 90
b = 96.012	β = 90
c = 136.272	γ = 120

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
SHELX	phasing
RESOLVE	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction
HKL-2000	data reduction
HKL-2000	data scaling
SHELXD	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2010-03-16 
• Released Date: 2010-05-12 
Deposition Author(s): Chen, Y.-H., Hu, L., Punta, M., Bruni, R., Hillerich, B., Kloss, B., Rost, B., Love, J., Siegelbaum, S.A., Hendrickson, W.A., New York Consortium on Membrane Protein Structure (NYCOMPS)

Revision History  

• 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