1LSS

KTN Mja218 CRYSTAL STRUCTURE IN COMPLEX WITH NAD+


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.220 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

A mechanism of regulating transmembrane potassium flux through a ligand-mediated conformational switch.

Roosild, T.P.Miller, S.Booth, I.R.Choe, S.

(2002) Cell 109: 781-791

  • DOI: 10.1016/s0092-8674(02)00768-7
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • The regulation of cation content is critical for cell growth. However, the molecular mechanisms that gate the systems that control K+ movements remain unclear. KTN is a highly conserved cytoplasmic domain present ubiquitously in a variety of prokaryo ...

    The regulation of cation content is critical for cell growth. However, the molecular mechanisms that gate the systems that control K+ movements remain unclear. KTN is a highly conserved cytoplasmic domain present ubiquitously in a variety of prokaryotic and eukaryotic K+ channels and transporters. Here we report crystal structures for two representative KTN domains that reveal a dimeric hinged assembly. Alternative ligands NAD+ and NADH block or vacate, respectively, the hinge region affecting the dimer's conformational flexibility. Conserved, surface-exposed hydrophobic patches that become coplanar upon hinge closure provide an assembly interface for KTN tetramerization. Mutational analysis using the KefC system demonstrates that this domain directly interacts with its respective transmembrane constituent, coupling ligand-mediated KTN conformational changes to the permease's activity.


    Organizational Affiliation

    Structural Biology Laboratory, Salk Institute and Division of Biology, University of California, San Diego, 92037, USA.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Trk system potassium uptake protein trkA homolog
A, B, C, D
140Methanocaldococcus jannaschiiMutation(s): 0 
Gene Names: KtrA
Find proteins for Q58505 (Methanocaldococcus jannaschii (strain ATCC 43067 / DSM 2661 / JAL-1 / JCM 10045 / NBRC 100440))
Go to UniProtKB:  Q58505
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAD
Query on NAD

Download CCD File 
A, B, C, D
NICOTINAMIDE-ADENINE-DINUCLEOTIDE
C21 H27 N7 O14 P2
BAWFJGJZGIEFAR-NNYOXOHSSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.220 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 92α = 90
b = 74.4β = 90
c = 86γ = 90
Software Package:
Software NamePurpose
SHARPphasing
CNSrefinement
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-07-03
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2014-11-12
    Changes: Structure summary
  • Version 1.4: 2020-03-18
    Changes: Data collection, Database references, Derived calculations