2V0P

The Structure of Tap42 Alpha4 Subunit


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.239 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

The Structure of Tap42/Alpha4 Reveals a Tetratricopeptide Repeat-Like Fold and Provides Insights Into Pp2A Regulation.

Yang, J.Roe, S.M.Prickett, T.D.Brautigan, D.L.Barford, D.

(2007) Biochemistry 46: 8807

  • DOI: 10.1021/bi7007118
  • Primary Citation of Related Structures:  
    2V0P

  • PubMed Abstract: 
  • Physiological functions of protein phosphatase 2A (PP2A) are determined via the association of its catalytic subunit (PP2Ac) with diverse regulatory subunits. The predominant form of PP2Ac assembles into a heterotrimer comprising the scaffolding PR65/A subunit together with a variable regulatory B subunit ...

    Physiological functions of protein phosphatase 2A (PP2A) are determined via the association of its catalytic subunit (PP2Ac) with diverse regulatory subunits. The predominant form of PP2Ac assembles into a heterotrimer comprising the scaffolding PR65/A subunit together with a variable regulatory B subunit. A distinct population of PP2Ac associates with the Tap42/alpha4 subunit, an interaction mutually exclusive with that of PR65/A. Tap42/alpha4 is also an interacting subunit of the PP2Ac-related phosphatases, PP4 and PP6. Tap42/alpha4, an essential protein in yeast and suppressor of apoptosis in mammals, contributes to critical cellular functions including the Tor signaling pathway. Here, we describe the crystal structure of the PP2Ac-interaction domain of Saccharomyces cerevisiae Tap42. The structure reveals an all alpha-helical protein with striking similarity to 14-3-3 and tetratricopeptide repeat (TPR) proteins. Mutational analyses of structurally conserved regions of Tap42/alpha4 identified a positively charged region critical for its interactions with PP2Ac. We propose a scaffolding function for Tap42/alpha4 whereby the interaction of PP2Ac at its N-terminus promotes the dephosphorylation of substrates recruited to the C-terminal region of the molecule.


    Organizational Affiliation

    Section of Structural Biology, Chester Beatty Laboratories, Institute of Cancer Research, 237 Fulham Road, London SW3 6JB, UK.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
TYPE 2A PHOSPHATASE-ASSOCIATED PROTEIN 42A, B234Saccharomyces cerevisiaeMutation(s): 0 
UniProt
Find proteins for Q04372 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore Q04372 
Go to UniProtKB:  Q04372
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, BL-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.239 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 44.633α = 81.31
b = 48.308β = 87.94
c = 71.96γ = 69.83
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
SHELXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-07-17
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2019-05-08
    Changes: Data collection, Derived calculations, Experimental preparation, Other
  • Version 1.3: 2019-05-15
    Changes: Data collection, Experimental preparation