The inhibitory effect of helenalin on telomerase activity is attributed to the alkylation of the CYS445 residue: Evidence from QM/MM simulations |
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| Affiliation: | 1. Institute of Postgraduate Medical Education and Research, Kolkata, West Bengal, India;4. Bhabha Atomic Research Centre, Mumbai, Maharashtra, India;1. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Moscow 119991, Russia;2. Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow 119991, Russia;3. Department of Chemistry, University of Georgia, Athens, GA 30602, USA;4. Department of Biochemistry and Molecular Biology, University of Georgia, Athens, GA 30602, USA |
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| Abstract: | Enhanced telomerase activity is a hallmark in the majority of cancer cells. Thus, understanding the interactions between telomerase and its inhibitors is fundamentally important for the development of novel anticancer drugs without severe side effects. In this study, the covalent binding of helenalin to CYS445 of telomerase (PDB ID: 3DU6) was simulated using combined quantum chemical and molecular mechanical (QM/MM) methods. The results showed that the reaction was a reversible Michael-type addition and a hydrogen bond was formed between helenalin and the side chain of LYS416 of telomerase during the reaction procedure. The LYS416 residue is vital to telomere DNA recognition by interacting with DNA base through hydrogen bonds. The alkylation of CYS445 of telomerase by helenalin may interfere with the telomere DNA recognition at the telomerase active site, thus resulting in inhibition of the enzyme activity. |
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| Keywords: | Telomerase inhibitor Helenalin Sesquiterpene lactone Anticancer Pseudo-bond approach |
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