3OSF

The structure of protozoan parasite Trichomonas vaginalis Myb2 in complex with MRE-2f-13 DNA

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.03 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.209 

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This is version 1.1 of the entry. See complete history. 


Literature

Molecular basis of the recognition of the ap65-1 gene transcription promoter elements by a Myb protein from the protozoan parasite Trichomonas vaginalis.

Jiang, I., Tsai, C.K., Chen, S.C., Wang, S.H., Amiraslanov, I., Chang, C.F., Wu, W.J., Tai, J.H., Liaw, Y.C., Huang, T.H.

(2011) Nucleic Acids Res 39: 8992-9008

  • DOI: 10.1093/nar/gkr558
  • Primary Citation of Related Structures:  
    3OSG, 3OSF

  • PubMed Abstract: 

    • Iron-inducible transcription of the ap65-1 gene in Trichomonas vaginalis involves at least three Myb-like transcriptional factors (tvMyb1, tvMyb2 and tvMyb3) that differentially bind to two closely spaced promoter sites, MRE-1/MRE-2r and MRE-2f. Here, we defined a fragment of tvMyb2 comprising residues 40-156 (tvMyb2₄₀₋₁₅₆) as the minimum structural unit that retains near full binding affinity with the promoter DNAs ...

    Iron-inducible transcription of the ap65-1 gene in Trichomonas vaginalis involves at least three Myb-like transcriptional factors (tvMyb1, tvMyb2 and tvMyb3) that differentially bind to two closely spaced promoter sites, MRE-1/MRE-2r and MRE-2f. Here, we defined a fragment of tvMyb2 comprising residues 40-156 (tvMyb2₄₀₋₁₅₆) as the minimum structural unit that retains near full binding affinity with the promoter DNAs. Like c-Myb in vertebrates, the DNA-free tvMyb2₄₀₋₁₅₆ has a flexible and open conformation. Upon binding to the promoter DNA elements, tvMyb2₄₀₋₁₅₆ undergoes significant conformational re-arrangement and structure stabilization. Crystal structures of tvMyb2₄₀₋₁₅₆ in complex with promoter element-containing DNA oligomers showed that 5'-a/gACGAT-3' is the specific base sequence recognized by tvMyb2₄₀₋₁₅₆, which does not fully conform to that of the Myb binding site sequence. Furthermore, Lys⁴⁹, which is upstream of the R2 motif (amino acids 52-102) also participates in specific DNA sequence recognition. Intriguingly, tvMyb2₄₀₋₁₅₆ binds to the promoter elements in an orientation opposite to that proposed in the HADDOCK model of the tvMyb1₃₅₋₁₄₁/MRE-1-MRE-2r complex. These results shed new light on understanding the molecular mechanism of Myb-DNA recognition and provide a framework to study the molecular basis of transcriptional regulation of myriad Mybs in T. vaginalis.

    Organizational Affiliation: 

    Institute of Biomedical Sciences, Academia Sinica, Taipei 115, Taiwan, ROC.



Macromolecules

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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
MYB21A, D126Trichomonas vaginalisMutation(s): 0 
Gene Names: TVAG_211210
UniProt
Find proteins for Q58HP3 (Trichomonas vaginalis)
Explore Q58HP3 
Go to UniProtKB:  Q58HP3
Protein Feature View
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  • Reference Sequence
  • Find similar nucleic acids by:  Sequence   |   Structure
    • Entity ID: 2
    MoleculeChainsLengthOrganismImage
    5'-D(*CP*TP*GP*TP*AP*TP*CP*GP*TP*CP*TP*TP*G)-3'B, E13N/A
    Protein Feature View
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    • Reference Sequence
    • Find similar nucleic acids by:  Sequence   |   Structure
      • Entity ID: 3
      MoleculeChainsLengthOrganismImage
      5'-D(*CP*AP*AP*GP*AP*CP*GP*AP*TP*AP*CP*AP*G)-3'C, F13N/A
      Protein Feature View
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      • Reference Sequence
      Small Molecules
      Ligands 1 Unique
      IDChainsName / Formula / InChI Key2D Diagram3D Interactions
      IPA
      Query on IPA
      Download Ideal Coordinates CCD File 
      		 G [auth A]ISOPROPYL ALCOHOL
      C3 H8 O
      KFZMGEQAYNKOFK-UHFFFAOYSA-N      		 Ligand Interaction
      Experimental Data & Validation

      Experimental Data

      • Method: X-RAY DIFFRACTION
      • Resolution: 2.03 Å
      • R-Value Free: 0.258 
      • R-Value Work: 0.206 
      • R-Value Observed: 0.209 
      • Space Group: P 21 21 21
      Unit Cell:
      Length ( Å )Angle ( ˚ )
      a = 73.941α = 90
      b = 77.352β = 90
      c = 84.41γ = 90
      Software Package:
      Software NamePurpose
      HKL-2000data collection
      SOLVEphasing
      RESOLVEmodel building
      PHENIXrefinement
      HKL-2000data reduction
      HKL-2000data scaling
      RESOLVEphasing

      Structure Validation

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      View more in-depth experimental data

      Entry History 

      Deposition Data

      Revision History  (Full details and data files)

      • Version 1.0: 2011-08-03
        Type: Initial release
      • Version 1.1: 2013-08-28
        Changes: Database references