Structural characterization of Helicobacter pylori dethiobiotin synthetase reveals differences between family members

Przemyslaw J. Porebski, Maria Klimecka, Maksymilian Chruszcz, Robert A. Nicholls, Krzysztof Murzyn, Marianne E. Cuff, Xiaohui Xu, Marcin Cymborowski, Garib N. Murshudov, Alexei Savchenko, Aled Edwards, Wladek Minor

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Dethiobiotin synthetase (DTBS) is involved in the biosynthesis of biotin in bacteria, fungi, and plants. As humans lack this pathway, DTBS is a promising antimicrobial drug target. We determined structures of DTBS from Helicobacter pylori (hpDTBS) bound with cofactors and a substrate analog, and described its unique characteristics relative to other DTBS proteins. Comparison with bacterial DTBS orthologs revealed considerable structural differences in nucleotide recognition. The C-terminal region of DTBS proteins, which contains two nucleotide-recognition motifs, differs greatly among DTBS proteins from different species. The structure of hpDTBS revealed that this protein is unique and does not contain a C-terminal region containing one of the motifs. The single nucleotide-binding motif in hpDTBS is similar to its counterpart in GTPases; however, isothermal titration calorimetry binding studies showed that hpDTBS has a strong preference for ATP. The structural determinants of ATP specificity were assessed with X-ray crystallographic studies of hpDTBS·ATP and hpDTBS·GTP complexes. The unique mode of nucleotide recognition in hpDTBS makes this protein a good target for H. pylori-specific inhibitors of the biotin synthesis pathway.

Original languageEnglish
Pages (from-to)1093-1105
Number of pages13
JournalFEBS Journal
Volume279
Issue number6
DOIs
StatePublished - Mar 2012
Externally publishedYes

Keywords

  • adenosine binding
  • biotin synthesis pathway
  • crystal structure
  • dethiobiotin synthesis
  • nucleotide recognition

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