1QUW

SOLUTION STRUCTURE OF THE THIOREDOXIN FROM BACILLUS ACIDOCALDARIUS


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: STRUCTURES WITH ACCEPTABLE COVALENT GEOMETRY,STRUCTURES WITH THE LEAST RESTRAINT VIOLATIONS 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

NMR solution structure of a novel thioredoxin from Bacillus acidocaldarius possible determinants of protein stability.

Nicastro, G.De Chiara, C.Pedone, E.Tato, M.Rossi, M.Bartolucci, S.

(2000) Eur.J.Biochem. 267: 403-413


  • PubMed Abstract: 
  • The thioredoxin (Trx) from Bacillus acidocaldarius (BacTrx), an eubacterium growing optimally at 333 K, is the first Trx described to date from a moderate thermophilic source. To understand the molecular basis of its thermostability, the three-dimens ...

    The thioredoxin (Trx) from Bacillus acidocaldarius (BacTrx), an eubacterium growing optimally at 333 K, is the first Trx described to date from a moderate thermophilic source. To understand the molecular basis of its thermostability, the three-dimensional structure in the oxidized form was determined by NMR methods. A total of 2276 1H-NMR derived distance constraints along with 23 hydrogen-bonds, 72 phi and 27 chi1 torsion angle restraints, were used in a protocol employing simulated annealing followed by restrained molecular dynamics and restrained energy minimization. BacTrx consists of a well-defined core region of five strands of beta-sheet, surrounded by four exposed alpha-helices, features shared by other members of the thioredoxin family. The BacTrx 3D structure was compared with the Escherichia coli Trx (EcTrx) determined by X-ray crystallographic diffraction, and a number of structural differences were observed that may contribute to its thermostabilty. The results of structural analysis indicated that protein stability is due to cumulative effects, the main factor being an increased number of ionic interactions cross-linking different secondary structural elements and clamping the C-terminal alpha-helix to the core of the protein.


    Related Citations: 
    • Computational Analysis of the Thermal Stability in Thioredoxins: a Molecular Dynamics Approach
      Pedone, E.M.,Bartolucci, S.,Rossi, M.,Saviano, M.
      (1998) J.Biomol.Struct.Dyn. 16: 437
    • Prediction and Experimental Testing of the Bacillus acidocaldarius Thioredoxin Stability
      Pedone, E.,Cannio, R.,Saviano, M.,Rossi, M.,Bartolucci, S.
      (1999) Biochem.J. 339: 309
    • Thioredoxin from Bacillus Acidocaldarius: Characterization, High-Level Expression in E. Coli and Molecular Modeling
      Bartolucci, S.,Guagliardi, A.,Pedone, E.,De Pascale, D.,Cannio, R.,Camardella, L.,Rossi, M.,Nicastro, G.,de Chiara, C.,Facci, P.,Mascetti, G.,Nicolini, C.
      (1997) Biochem.J. 328: 277


    Organizational Affiliation

    Istituto di Chimica Biologica, Università degli Studi di Parma, Italy.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
THIOREDOXIN
A
105Alicyclobacillus acidocaldariusMutation(s): 0 
Gene Names: trxA
Find proteins for P80579 (Alicyclobacillus acidocaldarius)
Go to UniProtKB:  P80579
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: STRUCTURES WITH ACCEPTABLE COVALENT GEOMETRY,STRUCTURES WITH THE LEAST RESTRAINT VIOLATIONS 
  • Olderado: 1QUW Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-01-26
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance