Biological Assembly 1  

 3D View: Structure

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 8.47 kDa 
• Atom Count: 594 
• Modelled Residue Count: 75 
• Deposited Residue Count: 75 
• Unique protein chains: 1

1TVS

TRIFLUOROETHANOL STABILIZES A HELIX-TURN-HELIX MOTIF IN EQUINE INFECTIOUS-ANEMIA-VIRUS TRANS-ACTIVATOR PROTEIN

• DOI: 10.2210/pdb1TVS/pdb

• Classification: TRANSCRIPTION REGULATION
• Organism(s): Equine infectious anemia virus
• Mutation(s): No 


• Deposited: 1994-09-14 Released: 1994-11-30 
• Deposition Author(s): Roesch, P., Sticht, H.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Submitted: 8 

Literature

Trifluoroethanol stabilizes a helix-turn-helix motif in equine infectious-anemia-virus trans-activator protein.

Sticht, H., Willbold, D., Ejchart, A., Rosin-Arbesfeld, R., Yaniv, A., Gazit, A., Rosch, P.

(1994) Eur J Biochem 225: 855-861

• PubMed: 7957222 
• DOI: 10.1111/j.1432-1033.1994.0855b.x
• Primary Citation of Related Structures:  
  1TVS


• PubMed Abstract: 
  

The solution structure of the 75-amino-acid trans-activator (Tat) protein of the equine infectious-anemia virus in trifluoroethanol-containing solution was determined by two-dimensional and three-dimensional nuclear magnetic resonance spectroscopy, resulting in a total of 838 nuclear-Over-hauser-enhancement distance restraints, and restrained molecular-dynamics simulations. In contrast to the recently determined structure of this protein in trifluoroethanol-free pH 6.3 solution, the hydrophobic core and the adjacent basic RNA-binding region of the protein showed well-defined alpha-helical secondary structure in trifluoroethanol-containing solution. The helical regions comprise those parts of the molecule whose helix-forming tendencies were noted earlier in trifluoroethanol-free solution. Two helices (Gln38-Arg43 and Asp48-Ala64) are connected by a tight type-II turn centered at the strictly conserved Gly46 leading to a helix-turn-helix motif in the core and basic region of the protein. A third helix (Thr9-Asn13) is located in the less well defined N-terminal part of the protein. These observations may support the notion that the protein adopts a helical structure in the RNA-binding region on complex formation. Although the secondary-structure elements become better defined in trifluoroethanol-containing solution, the opposite is true for the hydrophobically stabilized tertiary structure. This adds a caveat to studies of protein structures in trifluoroethanol-containing solution in general.

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Related Citations: 

• Equine Infectious Anemia Virus Tat is a Predominantly Helical Protein
  Sticht, H., Willbold, D., Bayer, P., Ejchart, A., Herrmann, F., Rosin-Arbesfeld, R., Gazit, A., Yaniv, A., Frank, R., Roesch, P.
  (1993) Eur J Biochem 218: 973

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Organizational Affiliation: 

Lehrstuhl für Biopolymere und Bayreuther Institut für Makromolekülforschung (BIMF), Universität Bayreuth, Germany.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
TRANSACTIVATOR PROTEIN	A	75	Equine infectious anemia virus	Mutation(s): 0  Gene Names: POTENTIAL, tat
UniProt
Find proteins for O89467 (Equine infectious anemia virus) Explore O89467  Go to UniProtKB:  O89467

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Submitted: 8 
• OLDERADO: 1TVS Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1994-09-14 
• Released Date: 1994-11-30 
Deposition Author(s): Roesch, P., Sticht, H.

Revision History  

• Version 1.0: 1994-11-30
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2017-11-29
  Changes: Derived calculations, Other