8K16

KtrA bound with ATP and thallium


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.10 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.237 
  • R-Value Observed: 0.239 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

Structural basis and synergism of ATP and Na + activation in bacterial K + uptake system KtrAB.

Chiang, W.T.Chang, Y.K.Hui, W.H.Chang, S.W.Liao, C.Y.Chang, Y.C.Chen, C.J.Wang, W.C.Lai, C.C.Wang, C.H.Luo, S.Y.Huang, Y.P.Chou, S.H.Horng, T.L.Hou, M.H.Muench, S.P.Chen, R.S.Tsai, M.D.Hu, N.J.

(2024) Nat Commun 15: 3850-3850

  • DOI: https://doi.org/10.1038/s41467-024-48057-y
  • Primary Citation of Related Structures:  
    8K16, 8K1K, 8K1S, 8K1T, 8K1U, 8XMH, 8XMI

  • PubMed Abstract: 

    The K + uptake system KtrAB is essential for bacterial survival in low K + environments. The activity of KtrAB is regulated by nucleotides and Na + . Previous studies proposed a putative gating mechanism of KtrB regulated by KtrA upon binding to ATP or ADP. However, how Na + activates KtrAB and the Na + binding site remain unknown. Here we present the cryo-EM structures of ATP- and ADP-bound KtrAB from Bacillus subtilis (BsKtrAB) both solved at 2.8 Å. A cryo-EM density at the intra-dimer interface of ATP-KtrA was identified as Na + , as supported by X-ray crystallography and ICP-MS. Thermostability assays and functional studies demonstrated that Na + binding stabilizes the ATP-bound BsKtrAB complex and enhances its K + flux activity. Comparing ATP- and ADP-BsKtrAB structures suggests that BsKtrB Arg417 and Phe91 serve as a channel gate. The synergism of ATP and Na + in activating BsKtrAB is likely applicable to Na + -activated K + channels in central nervous system.


  • Organizational Affiliation

    Graduate Institute of Biochemistry, National Chung Hsing University, Taichung, 402202, Taiwan.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ktr system potassium uptake protein A
A, B
222Bacillus subtilisMutation(s): 0 
Gene Names: ktrAyuaABSU31090
UniProt
Find proteins for O32080 (Bacillus subtilis (strain 168))
Explore O32080 
Go to UniProtKB:  O32080
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO32080
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.10 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.237 
  • R-Value Observed: 0.239 
  • Space Group: I 4
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 122.418α = 90
b = 122.418β = 90
c = 83.853γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
Blu-Icedata collection
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Ministry of Science and Technology (MoST, Taiwan)Taiwan--

Revision History  (Full details and data files)

  • Version 1.0: 2024-04-03
    Type: Initial release
  • Version 1.1: 2024-05-15
    Changes: Database references
  • Version 1.2: 2024-05-22
    Changes: Database references