Deciphering the interaction of benzoxaborole inhibitor AN2690 with connective polypeptide 1 (CP1) editing domain of Leishmania donovani leucyl-tRNA synthetase

Journal of Biosciences volume 45, Article number: 63 (2020) Cite this article

Abstract

Leucyl-tRNA synthetases (LRS) catalyze the linkage of leucine with tRNALeu. A large insertion CP1 domain (Connective Polypeptide 1) in LRS is responsible for post-transfer editing of mis-charged aminoacyl-tRNAs. Here, we characterized the CP1 domain of Leishmania donovani, a protozoan parasite, and its role in editing activity and interaction with broad spectrum anti-fungal, AN2690. The deletion mutant of LRS, devoid of CP1 domain (LRS-CP1Δ) was constructed, followed by determination of its role in editing and aminoacylation. Binding of AN2690 and different amino acids with CP1 deletion mutant and full length LRS was evaluated using isothermal titration calorimetry (ITC) and molecular dynamics simulations. The recombinant LRS-CP1Δ protein did not catalyze the aminoacylation and the editing reaction when compared to full-length LRS. Thus, indicating that CP1 domain was imperative for both aminoacylation and editing activities of LRS. Binding studies with different amino acids indicated selectivity of isoleucine by CP1 domain over other amino acids. These studies also indicated high affinity of AN2690 with the editing domain. Molecular docking studies indicated that AN2690-CP1 domain complex was stabilized by hydrogen bonding and hydrophobic interactions resulting in high binding affinity between the two. Our data suggests CP1 is crucial for the function of L. donovani LRS.

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Acknowledgements

We thank the Central Instrumentation facility at School of Life Sciences, Jawaharlal Nehru University, for providing the imaging facility. We also thank Advanced Instrumentation Research Facility, Jawaharlal Nehru University, for CD spectroscopy analysis.

Funding

R Madhubala is AS Paintal Distinguished Scientist Chair of ICMR. ST is a recipient of funding from the Indian Council of Medical Research, India. R Manhas and NT are recipients of funding from the University Grants Commission, India. RV is a SERB post-doctoral fellow. This work was funded by the Department of Science and Technology, India (Grant No. VI-D&P/569/2016-17/TDT/C).

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Affiliations

  1. School of Life Sciences, Jawaharlal Nehru University, New Delhi, India

    Smriti Tandon, Reetika Manhas, Ramachandran Vijayan, Samudrala Gourinath & Rentala Madhubala

  2. School of Physical Sciences, Jawaharlal Nehru University, New Delhi, India

    Neha Tiwari & Manoj Munde

  3. Chromatin Remodelling Laboratory, School of Life Sciences, Jawaharlal Nehru University, New Delhi, India

    Rohini Muthuswami

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  1. Smriti Tandon
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Correspondence to Rohini Muthuswami or Rentala Madhubala.

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Corresponding editor: Ravindra Venkatramani

Communicated by Ravindra Venkatramani.

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Tandon, S., Manhas, R., Tiwari, N. et al. Deciphering the interaction of benzoxaborole inhibitor AN2690 with connective polypeptide 1 (CP1) editing domain of Leishmania donovani leucyl-tRNA synthetase. J Biosci 45, 63 (2020). https://doi.org/10.1007/s12038-020-00031-8

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Keywords

  • AN2690
  • benzoxaborole inhibitor
  • CP1 domain
  • L. donovani
  • leucyl-tRNA synthetase