Abstract
Vinblastine and its related compound vincristine are important mono terpenoid indole alkaloids accumulated in the leaves of Catharanthus roseus (Madagascar periwinkle). They serve as major anticancer drugs. Vinblastine is formed by the condensation of vindoline and catharanthine. The vindoline moiety is derived from tabersonine via vindoline biosynthesis pathway. The reaction sequence from tabersonine to vindoline is now well established and the enzymes involved in this pathway are identified. However, to date, the structures of the enzymes involved in the vindoline biosynthesis pathway are not known, leading to limited mechanistic understanding of the substrate binding and catalysis. The purpose of this work is to provide structural insight regarding all the steps of the vindoline pathway via rigorous homology modeling, molecular docking, and molecular dynamics analyses. Substrate and cofactors required for each step were docked onto the computationally built and validated three-dimensional (3D) model of the corresponding enzyme, and the catalytic reaction was analyzed from the structural point of view. Possible binding modes of the substrates and cofactors were generated and corresponding binding residues were identified. Enzyme-substrate models were verified based on structure evaluation methods and molecular dynamics based approaches. Findings of our analysis would be useful in rational designing of these important enzymes aimed toward bio-production of vindoline.
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Acknowledgments
SC acknowledges CSIR-IICB for infrastructural support and Department of Biotechnology for Ramalingaswami fellowship. The work is supported by CSIR network projects funds (HCP002 and BSC0121).
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Ahmad, B., Banerjee, A., Tiwari, H. et al. Structural and functional characterization of the Vindoline biosynthesis pathway enzymes of Catharanthus roseus. J Mol Model 24, 53 (2018). https://doi.org/10.1007/s00894-018-3590-2
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DOI: https://doi.org/10.1007/s00894-018-3590-2