4.6 Article

Structural basis for the allosteric inhibition of UMP kinase from Gram-positive bacteria, a promising antibacterial target

期刊

FEBS JOURNAL
卷 289, 期 16, 页码 4869-4887

出版社

WILEY
DOI: 10.1111/febs.16393

关键词

allostery; cryo-EM single particle analysis; crystal structure; enzyme regulation; nucleotide metabolism

资金

  1. Synchrotron SOLEIL
  2. European Union's Framework Programme for Research and Innovation Horizon 2020 (2014-2020) under the Marie Skodowska-Curie Grant [675555]
  3. Centre National de la Recherche Scientifique (CNRS)
  4. Institut National de la Sante Et de la Recherche Medicale (INSERM)
  5. Institut Pasteur
  6. French Infrastructure for IntegratedStructural Biology (FRISBI) [ANR-10-INBS-05]
  7. EU [675555]

向作者/读者索取更多资源

Tuberculosis claims over one million lives each year. Developing new antibiotics is a feasible approach to address drug resistance. Bacterial UMP kinase, which is essential for bacterial survival and has no human counterpart, serves as a promising target for novel antibiotic discovery. This study provides a detailed description of the UTP-binding site of a typical Gram-positive behaving UMP kinase, shedding light on the allosteric regulation of this enzyme and offering valuable insights for future drug discovery strategies.
Tuberculosis claims significantly more than one million lives each year. A feasible way to face the issue of drug resistance is the development of new antibiotics. Bacterial uridine 5'-monophosphate (UMP) kinase is a promising target for novel antibiotic discovery as it is essential for bacterial survival and has no counterpart in human cells. The UMP kinase from M. tuberculosis is also a model of particular interest for allosteric regulation with two effectors, GTP (positive) and UTP (negative). In this study, using X-ray crystallography and cryo-electron microscopy, we report for the first time a detailed description of the negative effector UTP-binding site of a typical Gram-positive behaving UMP kinase. Comparison between this snapshot of low affinity for Mg-ATP with our previous 3D-structure of the GTP-bound complex of high affinity for Mg-ATP led to a better understanding of the cooperative mechanism and the allosteric regulation of UMP kinase. Thermal shift assay and circular dichroism experiments corroborate our model of an inhibition by UTP linked to higher flexibility of the Mg-ATP-binding domain. These new structural insights provide valuable knowledge for future drug discovery strategies targeting bacterial UMP kinases.

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