4HPF

Structure of the human SLO3 gating ring

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.40 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.247 
  • R-Value Observed: 0.248 

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This is version 1.3 of the entry. See complete history. 


Literature

Functional and structural analysis of the human SLO3 pH- and voltage-gated K+ channel.

Leonetti, M.D., Yuan, P., Hsiung, Y., Mackinnon, R.

(2012) Proc Natl Acad Sci U S A 109: 19274-19279

  • DOI: 10.1073/pnas.1215078109
  • Primary Citation of Related Structures:  
    4HPF

  • PubMed Abstract: 

    • The activation of eukaryotic SLO K(+) channels by intracellular cues, mediated by a cytoplasmic structure called the gating ring, is central to their physiological roles. SLO3 channels are exclusively expressed in mammalian sperm, where variations of intracellular pH are critical to cellular function ...

    The activation of eukaryotic SLO K(+) channels by intracellular cues, mediated by a cytoplasmic structure called the gating ring, is central to their physiological roles. SLO3 channels are exclusively expressed in mammalian sperm, where variations of intracellular pH are critical to cellular function. Previous studies primarily focused on the mouse SLO3 orthologue and revealed that, in murine sperm, SLO3 mediates a voltage- and alkalization-activated K(+) current essential to male fertility. Here we investigate the activation of the human SLO3 channel by intracellular pH at the functional and structural level. By using electrophysiology in a heterologous system, we show that human SLO3 opens upon intracellular pH increase and that its expression and functional properties are modulated by LRRC52, a testis-specific accessory subunit. We next present the crystal structure of the human SLO3 gating ring. Comparison with the known structures of the corresponding domain from SLO1, a Ca(2+)-activated homologue, suggests that the SLO3 gating ring structure may represent an open state. Together, these results present insights into the function of a protein expected to be critical for human reproduction and provide a framework to study the mechanism of pH gating in SLO3 channels.

    Organizational Affiliation: 

    Laboratory of Molecular Neurobiology and Biophysics and Howard Hughes Medical Institute, The Rockefeller University, New York, NY 10065, USA.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Potassium channel subfamily U member 1A, B722Homo sapiensMutation(s): 0 
Gene Names: KCNMA3, KCNMC1, KCNU1, SLO3
Membrane protein
Mpstruc		Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group: 
Channels: Potassium, Sodium, & Proton Ion-Selective		Protein: 
SLO3 K+ Channel pH-sensitive Gating Ring
Find proteins for A8MYU2 (Homo sapiens)
Explore A8MYU2 
Go to UniProtKB:  A8MYU2
NIH Common Fund Data Resources
PHAROS:  A8MYU2
GTEx:  ENSG00000215262
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.40 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.247 
  • R-Value Observed: 0.248 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 124.54α = 90
b = 157.94β = 90
c = 249.01γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
MOLREPphasing
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-2000data collection

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-11-07
    Type: Initial release
  • Version 1.1: 2012-12-05
    Changes: Database references
  • Version 1.2: 2017-08-09
    Changes: Refinement description, Source and taxonomy
  • Version 1.3: 2017-11-15
    Changes: Refinement description