1J2M

Solution structure of CPI-17(22-120)


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 30 
  • Conformers Submitted: 
  • Selection Criteria: energy-minimized average structure 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Distinctive Solution Conformation of Phosphatase Inhibitor CPI-17 Substituted with Aspartate at the Phosphorylation-site Threonine Residue

Ohki, S.Eto, M.Shimizu, M.Takada, R.Brautigan, D.L.Kainosho, M.

(2003) J.Mol.Biol. 326: 1539-1547

  • Primary Citation of Related Structures:  1J2N

  • PubMed Abstract: 
  • We present solution NMR structures for wild-type and mutated forms of CPI-17, a phosphoinhibitor for protein phosphatase 1. Phosphorylation of Thr38 of CPI-17 produces a >1000-fold increase in inhibitory potency for myosin phosphatase. We compared th ...

    We present solution NMR structures for wild-type and mutated forms of CPI-17, a phosphoinhibitor for protein phosphatase 1. Phosphorylation of Thr38 of CPI-17 produces a >1000-fold increase in inhibitory potency for myosin phosphatase. We compared the 1H-15N heteronuclear single quantum coherence spectroscopy (HSQC) chemical shifts of wild-type CPI-17, partially phosphorylated CPI-17 and CPI-17 with Thr38 replaced with Asp to introduce a negative charge. There was a switch in the protein conformation due to either Asp substitution or phosphorylation, so we determined the solution NMR structure of the CPI-17 T38D mutant as a model for the active (phospho-) conformation. The structures reveal a molecular switch in conformation that involves the rotation of two of the four helices in the four helix bundle. Despite this conformational switch, there was little increase in the inhibitory potency with T38D. We propose that for this inhibitor, a negative charge at residue 38 is sufficient to trigger an active conformation, but a phosphoryl group is required for full inhibitory potency against protein phosphatase-1.


    Organizational Affiliation

    CREST and Graduate School of Science, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo 192-0397, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
17-kDa PKC-potentiated inhibitory protein of PP1
A
99Sus scrofaGene Names: CPI17
Find proteins for O18734 (Sus scrofa)
Go to UniProtKB:  O18734
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 30 
  • Conformers Submitted: 
  • Selection Criteria: energy-minimized average structure 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-06-17
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance