Partial 3d structure of the c-terminal part of the free arabidopsis thaliana cp12-2 in its oxidized form

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 150 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

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Conformational Selection and Folding-upon-binding of Intrinsically Disordered Protein CP12 Regulate Photosynthetic Enzymes Assembly.

Fermani, S.Trivelli, X.Sparla, F.Thumiger, A.Calvaresi, M.Marri, L.Falini, G.Zerbetto, F.Trost, P.

(2012) J Biol Chem 287: 21372-21383

  • DOI: https://doi.org/10.1074/jbc.M112.350355
  • Primary Citation of Related Structures:  
    2LJ9, 3QV1, 3RVD

  • PubMed Abstract: 

    Carbon assimilation in plants is regulated by the reduction of specific protein disulfides by light and their re-oxidation in the dark. The redox switch CP12 is an intrinsically disordered protein that can form two disulfide bridges. In the dark oxidized CP12 forms an inactive supramolecular complex with glyceraldehyde-3-phosphate dehydrogenase (GAPDH) and phosphoribulokinase, two enzymes of the carbon assimilation cycle. Here we show that binding of CP12 to GAPDH, the first step of ternary complex formation, follows an integrated mechanism that combines conformational selection with induced folding steps. Initially, a CP12 conformation characterized by a circular structural motif including the C-terminal disulfide is selected by GAPDH. Subsequently, the induced folding of the flexible C-terminal tail of CP12 in the active site of GAPDH stabilizes the binary complex. Formation of several hydrogen bonds compensates the entropic cost of CP12 fixation and terminates the interaction mechanism that contributes to carbon assimilation control.

  • Organizational Affiliation

    Department of Chemistry G Ciamician, University of Bologna, 40126 Bologna, Italy.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CP12 domain-containing protein 299Arabidopsis thalianaMutation(s): 0 
Gene Names: At3g62410CP12-2T12C14_110
Find proteins for Q9LZP9 (Arabidopsis thaliana)
Explore Q9LZP9 
Go to UniProtKB:  Q9LZP9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9LZP9
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 150 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-04-25
    Type: Initial release
  • Version 1.1: 2012-06-27
    Changes: Database references