1EXE

SOLUTION STRUCTURE OF A MUTANT OF TRANSCRIPTION FACTOR 1.


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 23 
  • Selection Criteria: structures with acceptable covalent geometry,structures with the least restraint violations,structures with the lowest energy 

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This is version 1.2 of the entry. See complete history


Literature

Solution structure of a mutant of transcription factor 1: implications for enhanced DNA binding.

Liu, W.Vu, H.M.Geiduschek, E.P.Kearns, D.R.

(2000) J Mol Biol 302: 821-830

  • DOI: 10.1006/jmbi.2000.4084
  • Primary Citation of Related Structures:  
    1EXE

  • PubMed Abstract: 
  • An NMR solution structure of a mutant of the homodimer protein transcription factor 1, TF1-G15/I32 (22 kDa), has been solved to atomic resolution, with 23 final structures that converge to an r.m. s.d. of 0.78 A. The overall shape of TF1-G15/I32 remains similar to that of the wild-type protein and other type II DNA-binding proteins ...

    An NMR solution structure of a mutant of the homodimer protein transcription factor 1, TF1-G15/I32 (22 kDa), has been solved to atomic resolution, with 23 final structures that converge to an r.m. s.d. of 0.78 A. The overall shape of TF1-G15/I32 remains similar to that of the wild-type protein and other type II DNA-binding proteins. Each monomer has two N-terminal alpha-helices separated by a short loop, followed by a three-stranded beta-sheet, whose extension between the second and third beta-strands forms an antiparallel beta-ribbon arm, leading to a C-terminal third alpha-helix that is severely kinked in the middle. Close examination of the structure of TF1-G15/I32 reveals why it is more stable and binds DNA more tightly than does its wild-type counterpart. The dimeric core, consisting of the N-terminal helices and the beta-sheets, is more tightly packed, and this might be responsible for its increased thermal stability. The DNA-binding domain, composed of the top face of the beta-sheet, the beta-ribbon arms and the C-terminal helices, is little changed from wild-type TF1. Rather, the enhancement in DNA affinity must be due almost exclusively to the creation of an additional DNA-binding site at the side of the dimer by changes affecting helices 1 and 2: helix 2 of TF1-G15/I32 is one residue longer than helix 2 of the wild-type protein, bends inward, and is both translationally and rotationally displaced relative to helix 1. This rearrangement creates a longer, narrower fissure between the V-shaped N-terminal helices and exposes additional positively charged surface at each side of the dimer.


    Related Citations: 
    • Mechanisms for the Enhanced Thermal Stability of a Mutant of Transcription Factor 1 as Explained by 1H, 15N and 13C NMR Chemical Shifts and Secondary Structure Analysis.
      Vu, H.M., Liu, W., Grove, A., Geiduschek, E.P., Kearns, D.R.
      (2000) Biochim Biophys Acta 1478: 113
    • Structure of the Bacillus subtilis phage SPO1-encoded Type II DNA-binding Protein TF1 in Solution.
      Jia, X., Grove, A., Ivancic, M., Hsu, V.L., Geiduschek, E.P., Kearns, D.R.
      (1996) J Mol Biol 263: 259

    Organizational Affiliation

    Department of Chemistry and Biochemistry, University of California, at San Diego, La Jolla, CA 92093, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
TRANSCRIPTION FACTOR 1 AB99Bacillus virus SPO1Mutation(s): 2 
Gene Names: TF1
Find proteins for P04445 (Bacillus phage SP01)
Explore P04445 
Go to UniProtKB:  P04445
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 23 
  • Selection Criteria: structures with acceptable covalent geometry,structures with the least restraint violations,structures with the lowest energy 
  • OLDERADO: 1EXE Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-10-18
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance