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Structure of Ddn, the deazaflavin-dependent nitroreductase from Mycobacterium tuberculosis involved in bioreductive activation of PA-824

  • Susan E. Cellitti
  • , Jennifer Shaffer
  • , David H. Jones
  • , Tathagata Mukherjee
  • , Meera Gurumurthy
  • , Badry Bursulaya
  • , Helena I. Boshoff
  • , Inhee Choi
  • , Amit Nayyar
  • , Yong Sok Lee
  • , Joseph Cherian
  • , Pornwaratt Niyomrattanakit
  • , Thomas Dick
  • , Ujjini H. Manjunatha
  • , Clifton E. Barry
  • , Glen Spraggon
  • , Bernhard H. Geierstanger

Research output: Contribution to journal › Article › peer-review

Abstract

Tuberculosis continues to be a global health threat, making bicyclic nitroimidazoles an important new class of therapeutics. A deazaflavin-dependent nitroreductase (Ddn) from Mycobacterium tuberculosis catalyzes the reduction of nitroimidazoles such as PA-824, resulting in intracellular release of lethal reactive nitrogen species. The N-terminal 30 residues of Ddn are functionally important but are flexible or access multiple conformations, preventing structural characterization of the full-length, enzymatically active enzyme. Several structures were determined of a truncated, inactive Ddn protein core with and without bound F 420 deazaflavin coenzyme as well as of a catalytically competent homolog from Nocardia farcinica. Mutagenesis studies based on these structures identified residues important for binding of F 420 and PA-824. The proposed orientation of the tail of PA-824 toward the N terminus of Ddn is consistent with current structure-activity relationship data.

Original languageEnglish
Pages (from-to)101-112
Number of pages12
JournalStructure
Volume20
Issue number1
DOIs
StatePublished - Jan 11 2012

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

  1. SDG 3 - Good Health and Well-being
    SDG 3 Good Health and Well-being

ASJC Scopus subject areas

  • Structural Biology
  • Molecular Biology

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