Rat PP5 co-crystallized with P5SA-2

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.216 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report

This is version 1.4 of the entry. See complete history


Selective activators of protein phosphatase 5 target the auto-inhibitory mechanism.

Haslbeck, V.Drazic, A.Eckl, J.M.Alte, F.Helmuth, M.Popowicz, G.Schmidt, W.Braun, F.Weiwad, M.Fischer, G.Gemmecker, G.Sattler, M.Striggow, F.Groll, M.Richter, K.

(2015) Biosci Rep 35

  • DOI: https://doi.org/10.1042/BSR20150042
  • Primary Citation of Related Structures:  
    4JA7, 4JA9

  • PubMed Abstract: 

    Protein phosphatase 5 (PP5) is an evolutionary conserved serine/threonine phosphatase. Its dephosphorylation activity modulates a diverse set of cellular factors including protein kinases and the microtubule-associated tau protein involved in neurodegenerative disorders. It is auto-regulated by its heat-shock protein (Hsp90)-interacting tetratricopeptide repeat (TPR) domain and its C-terminal α-helix. In the present study, we report the identification of five specific PP5 activators [PP5 small-molecule activators (P5SAs)] that enhance the phosphatase activity up to 8-fold. The compounds are allosteric modulators accelerating efficiently the turnover rate of PP5, but do barely affect substrate binding or the interaction between PP5 and the chaperone Hsp90. Enzymatic studies imply that the compounds bind to the phosphatase domain of PP5. For the most promising compound crystallographic comparisons of the apo PP5 and the PP5-P5SA-2 complex indicate a relaxation of the auto-inhibited state of PP5. Residual electron density and mutation analyses in PP5 suggest activator binding to a pocket in the phosphatase/TPR domain interface, which may exert regulatory functions. These compounds thus may expose regulatory mechanisms in the PP5 enzyme and serve to develop optimized activators based on these scaffolds.

  • Organizational Affiliation

    Department of Chemistry, Center for Integrated Protein Science, Technische Universität München, 85748 Garching, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Serine/threonine-protein phosphatase 5488Rattus norvegicusMutation(s): 0 
Gene Names: Ppp5c
Find proteins for P53042 (Rattus norvegicus)
Explore P53042 
Go to UniProtKB:  P53042
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP53042
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.216 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.1α = 90
b = 51.1β = 90
c = 365.67γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-02-19
    Type: Initial release
  • Version 1.1: 2015-11-11
    Changes: Database references, Other
  • Version 1.2: 2016-02-10
    Changes: Database references
  • Version 1.3: 2016-08-10
    Changes: Database references
  • Version 1.4: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description