Structural changes in the cap of rv0183/mtbmgl modulate the shape of the binding pocket

Christoph Grininger, Mario Leypold, Philipp Aschauer, Tea Pavkov-Keller, Lina Riegler-Berket, Rolf Breinbauer, Monika Oberer*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Tuberculosis continues to be a major threat to the human population. Global efforts to eradicate the disease are ongoing but are hampered by the increasing occurrence of multidrug-resistant strains of Mycobacterium tuberculosis. Therefore, the development of new treatment, and the exploration of new druggable targets and treatment strategies, are of high importance. Rv0183/mtbMGL, is a monoacylglycerol lipase of M. tuberculosis and it is involved in providing fatty acids and glycerol as building blocks and as an energy source. Since the lipase is expressed during the dormant and active phase of an infection, Rv0183/mtbMGL is an interesting target for inhibition. In this work, we determined the crystal structures of a surface-entropy reduced variant K74A Rv0183/mtbMGL in its free form and in complex with a substrate mimicking inhibitor. The two structures reveal conformational changes in the cap region that forms a major part of the substrate/inhibitor binding region. We present a completely closed conformation in the free form and semi-closed conformation in the ligand-bound form. These conformations differ from the previously published, completely open conformation of Rv0183/mtbMGL. Thus, this work demonstrates the high conformational plasticity of the cap from open to closed conformations and provides useful insights into changes in the substrate-binding pocket, the target of potential small-molecule inhibitors.

Original languageEnglish
Article number1299
JournalBiomolecules
Volume11
Issue number9
DOIs
Publication statusPublished - Sep 2021

Keywords

  • Conformational change
  • Covalent inhibitors
  • Lipase
  • Monoacylglycerol lipase
  • Mycobacterium tuberculosis
  • Rv0183
  • X-ray crystallography

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology

Fields of Expertise

  • Human- & Biotechnology

Cooperations

  • BioTechMed-Graz

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