1GL8

Solution structure of thioredoxin m from spinach, oxidized form


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 25 
  • Conformers Submitted: 25 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Three-Dimensional Solution Structure and Stability of Thioredoxin M from Spinach.

Neira, J.L.Gonzalez, C.Toiron, C.De Prat-Gay, G.Rico, M.

(2001) Biochemistry 40: 15246


  • PubMed Abstract: 
  • Proton NMR spectral resonances of thioredoxin m from spinach have been assigned, and its solution structure has been determined on the basis of 1156 nuclear Overhauser effect- (NOE-) derived distance constraints by using restrained molecular dynamics ...

    Proton NMR spectral resonances of thioredoxin m from spinach have been assigned, and its solution structure has been determined on the basis of 1156 nuclear Overhauser effect- (NOE-) derived distance constraints by using restrained molecular dynamics calculations. The average pairwise root-mean-square deviation (RMSD) for the 25 best NMR structures for the backbone was 1.0 +/- 0.1, when the structurally well-defined residues were considered. The N- and C-terminal segments (1-13 and 118-119) and residues 41-49, comprising the active site, are highly disordered. At the time of concluding this work, a crystal structure of this protein was reported, in which thioredoxin m was found to crystallize as noncovalent dimers. Although the solution and crystal structures are very similar, no evidence was found about the existence of dimers in solution, thus confirming that dimerization is not needed for the regulatory activity of thioredoxin m. The spinach thioredoxin m does not unfold by heat in the range 25-85 degrees C, as revealed by thermal circular dichroic (CD) measurements. However, its unfolding free energy (9.1 +/- 0.8 kcal mol(-1), at pH 5.3 and 25 degrees C) could be determined by extrapolating the free energy values obtained at different concentrations of guanidinium chloride (GdmCl). The folding-unfolding process is two-state as indicated by the coincidence of the CD denaturation curves obtained at far and near UV. The H/D exchange behavior of backbone amide protons was analyzed. The slowest-exchanging protons, requiring a global-unfolding mechanism in order to exchange, are those from beta2, beta3, and beta4, the central strands of the beta-sheet, which constitute the main element of the core of the protein. The free energies obtained from exchange measurements of protons belonging to the alpha-helices are lower than those derived from GdmCl denaturation studies, indicating that those protons exchange by local-unfolding mechanisms.


    Organizational Affiliation

    Centro de Biología Molecular y Celular, Universidad Miguel Hernández, 03202 Elche (Alicante), Spain.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
THIOREDOXIN
A
104Spinacia oleraceaMutation(s): 0 
Find proteins for P07591 (Spinacia oleracea)
Go to UniProtKB:  P07591
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 25 
  • Conformers Submitted: 25 
  • Olderado: 1GL8 Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-12-13
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance