3GJ9

crystal structure of TIP-1 in complex with c-terminal of Kir2.3


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.247 
  • R-Value Observed: 0.247 

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


Literature

Molecular mechanism of inward rectifier potassium channel 2.3 regulation by tax-interacting protein-1

Yan, X.Zhou, H.Zhang, J.Shi, C.Xie, X.Wu, Y.Tian, C.Shen, Y.Long, J.

(2009) J Mol Biol 392: 967-976

  • DOI: https://doi.org/10.1016/j.jmb.2009.07.060
  • Primary Citation of Related Structures:  
    3GJ9

  • PubMed Abstract: 

    Inwardly rectifying potassium channel 2.3 (Kir2.3) is specifically targeted on the basolateral membranes of epithelial and neuronal cells, and it thus plays an important role in maintaining potassium homeostasis. Tax-interacting protein-1 (TIP-1), an atypical PDZ-domain-containing protein, binds to Kir2.3 with a high affinity, causing the intracellular accumulation of Kir2.3 in cultured epithelial cells. However, the molecular basis of the TIP-1/Kir2.3 interaction is still poorly understood. Here, we present the crystal structure of TIP-1 in complex with the C-terminal Kir2.3-peptide (residues 436-445) to reveal the molecular details of the interaction between them. Moreover, isothermal titration calorimetry experiments show that the C-terminal Kir2.3-peptide binds much more strongly to TIP-1 than to mammalian Lin-7, indicating that TIP-1 can compete with mammalian Lin-7 to uncouple Kir2.3 from its basolateral membrane anchoring complex. We further show that the phosphorylation/dephosphorylation of Ser443 within the C-terminal Kir2.3 PDZ-binding motif RRESAI dynamically regulates the Kir2.3/TIP-1 association in heterologous HEK293T cells. These data suggest that TIP-1 may act as an important regulator for the endocytic pathway of Kir2.3.


  • Organizational Affiliation

    Tianjin Key Laboratory of Protein Science, College of Life Science, Nankai University, Tianjin 300071, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Tax1-binding protein 3
A, B
124Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for O14907 (Homo sapiens)
Explore O14907 
Go to UniProtKB:  O14907
PHAROS:  O14907
GTEx:  ENSG00000213977 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO14907
Sequence Annotations
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  • Reference Sequence

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
C-terminal peptide from Inward rectifier potassium channel 4
C, D
10N/AMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P48050 (Homo sapiens)
Explore P48050 
Go to UniProtKB:  P48050
PHAROS:  P48050
GTEx:  ENSG00000168135 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP48050
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.247 
  • R-Value Observed: 0.247 
  • Space Group: P 43 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 86.457α = 90
b = 86.457β = 90
c = 101.517γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
PHASESphasing
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

  • Released Date: 2009-12-15 
  • Deposition Author(s): Shen, Y.

Revision History  (Full details and data files)

  • Version 1.0: 2009-12-15
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-11-01
    Changes: Data collection, Database references, Derived calculations, Refinement description