Dihydroxyacetone kinase operon co-activator Dha-DhaQ

Experimental Data Snapshot

  • Resolution: 1.96 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.182 

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Regulation of the Dha Operon of Lactococcus Lactis: A Deviation from the Rule Followed by the Tetr Family of Transcription Regulators

Christen, S.Srinivas, A.Bahler, P.Zeller, A.Pridmore, D.Bieniossek, C.Baumann, U.Erni, B.

(2006) J Biol Chem 281: 23129

  • DOI: https://doi.org/10.1074/jbc.M603486200
  • Primary Citation of Related Structures:  
    2IU4, 2IU5, 2IU6

  • PubMed Abstract: 

    Dihydroxyacetone (Dha) kinases are a novel family of kinases with signaling and metabolic functions. Here we report the x-ray structures of the transcriptional activator DhaS and the coactivator DhaQ and characterize their function. DhaQ is a paralog of the Dha binding Dha kinase subunit; DhaS belongs to the family of TetR repressors although, unlike all known members of this family, it is a transcriptional activator. DhaQ and DhaS form a stable complex that in the presence of Dha activates transcription of the Lactococcus lactis dha operon. Dha covalently binds to DhaQ through a hemiaminal bond with a histidine and thereby induces a conformational change, which is propagated to the surface via a cantilever-like structure. DhaS binding protects an inverted repeat whose sequence is GGACACATN6ATTTGTCC and renders two GC base pairs of the operator DNA hypersensitive to DNase I cleavage. The proximal half-site of the inverted repeat partially overlaps with the predicted -35 consensus sequence of the dha promoter.

  • Organizational Affiliation

    Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
336Lactococcus lactisMutation(s): 0 
Find proteins for Q9CIW0 (Lactococcus lactis subsp. lactis (strain IL1403))
Explore Q9CIW0 
Go to UniProtKB:  Q9CIW0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9CIW0
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.96 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.182 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 99.897α = 90
b = 99.897β = 90
c = 188.566γ = 120
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-06-13
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance