Leslie Gunatilaka

Leslie Gunatilaka

Professor, Natural Resources and the Environment
Director, Natural Products Center
Professor, Pharmacology and Toxicology
Professor, Cancer Biology - GIDP
Professor, Arid Lands Resources Sciences - GIDP
Professor, BIO5 Institute
Contact
(520) 621-9932

Work Summary

Discovery of natural products from plants and their associated microorganisms as potential drugs to treat cancer. Application of medicinal chemistry approach for structure-activity relationship studies and to obtain compounds for preclinical evaluation. Development of alternative agricultural systems for sustainable utilization of natural resources.

Research Interest

Despite many therapeutic successes, cancer remains a major cause of mortality in the US. Natural products (NPs) represent the best source and inspiration for the discovery of drugs and molecular targets. Our aim is to discover effective and non-toxic NP-based anticancer drugs. Working with NCI we have recently discovered a class of plant-derived NPs useful in cancer immunotherapy. The main focus of our current research is to utilize medicinal chemistry approach to obtain their analogues for preclinical evaluation. Leslie Gunatilaka is Professor at the School of Natural Resources and the Environment and Director of the Natural Products Center. He is also Adjunct Professor of Department of Nutritional Sciences, and a member of the Arizona Cancer Center. He is a member of several professional societies, editorial boards, and pharmaceutical company advisory groups. He is a Fellow of the Academy of Sciences for the Developing World (TWAS), Italy, and the National Academy of Sciences, Sri Lanka. Dr. Gunatilaka has over 200 peer-reviewed publications and book chapters and over 150 communications in natural product science to his credit. He is the recipient of the Sri Lankan Presidents’ gold medal for “creating a center of excellence in natural products research at the University of Peradeniya, Sri Lanka” (1987), CaPCURE award for “dedication to ending prostate cancer as a risk for all men and their families” (2000), Research Faculty of the Year Award of the UA College of Agriculture and Life Sciences (2003), the UA Asian American Faculty, Staff and Alumni Association Outstanding Faculty Award (2005), and the UA Leading Edge Researcher Award for Innovative Research (2012). He has delivered over 100 invited lectures worldwide and was the Chief Guest and Plenary Lecturer at the International Herbal Medicine Conference held in Sri Lanka (2005), and the Keynote Speaker and the Guest of Honor at Chemtech-2007, an International Conference organized by the Institute of Chemistry, Ceylon. His current research interests include discovery, identification of protein targets, and structure-activity relationship (SAR) studies of natural product-based drugs to treat cancer, neurodegenerative, and other diseases from plants, and plant- and lichen-associated microorganisms, maximization of chemistry diversity and production of microbial and plant secondary metabolites, and scientific investigation of medicinal plants and herbal supplements. Keywords: Natural Product-Based Drug Discovery, Medicinal Chemistry, Cancer Immunotherapeutic Agents

Publications

Dagne, E., Gunatilaka, A., Asmellash, S., Abate, D., Kingston, D. G., Hofmann, G. A., & Johnson, R. K. (1994). Two new cytotoxic cytochalasins from Xylaria obovata. Tetrahedron, 50(19), 5615-5620.

Abstract:

Two new cytotoxic cytochalasins were isolated by brine shrimp bioassay-guided fractionation from a culture of the wood inhabiting fungus, Xylaria obovata. Their structures were determined as 19,20-epoxycytochalasin Q (1) and its deacetyl analog 2 by the application of spectroscopic techniques and chemical correlation with cytochalasin R. Acetylation of 2 yielded 1. Both 1 and 2 were cytotoxic but were found to be inactive in an HIV-protease inhibitory assay and a mechanism-based DNA damaging yeast assay. © 1994.

Herz, J. E., Torres, J. V., Murillo, A., Cruz, S., Shafiee, A., Vosooghi, M., Sotheeswaran, S., & Gunatilaka, A. A. (1985). Potential long-acting contraceptive agents: Esters and ethersof testosterone with α-and/or β-chain branching. Steroids, 46(6), 947-953.

PMID: 3842023;Abstract:

The synthesis of ten esters and two ethers of testosterone (17 β-hydroxyandrost-4-en-3-one) is described. All these possess some form of α-and/or β-substitution in the ester/ether sidechain. The work was undertaken in order to evaluate the long-acting antifertility effect of such compounds in males. © 1985.

Gunatilaka, L., Tillotson, J., Bashyal, B. P., Kang, M., Shi, T., Cruz, F. D., & Chapman, E. (2016). Selective inhibition of p97 by chlorinated analogues of dehydrocurvularin. Organic & Biomolecular Chemistry, 14, 5918-5921.
Gunatilaka, A. L. (1998). Chapter 1 Alkaloids From Sri Lankan Flora*. Alkaloids: Chemistry and Biology, 52(C), 1-101.
Gunatilaka, A. L., & Sotheeswaran, S. (1978). Convenient preparation of esters of testosterone and 19-norethisterone with hindered acids. Journal of the Chemical Society, Chemical Communications, 980-981.

Abstract:

Testosterone and 19-norethisterone are smoothly esterified by some hindered carboxylic acids in pyridine containing benzenesulphonyl chloride.