Natural products (NPs) and NP derivatives are an unrivaled, but highly under-represented, resource. Arguably among the most notable natural products discovered to date, the 10-membered enediynes - exemplified by the saccharide-fused calicheamicins (CLM) and the anthraquinone-fused dynemicins (DYN) - offer unprecedented molecular architecture, spectacular biological activity and demonstrated clinical utility. The objective of the first phase of this study (CA84374, years 1-4) was to i) clone and characterize the CLM gene cluster from M. echinospora, ii) develop the genetic tools to address CLM biosynthesis in M. echinospora, iii) investigate the mechanism(s) of CLM self-resistance, and iv) initiate aryltetrasaccharide biosynthetic studies. With these goals largely achieved and new tools/information in place, the second phase of this program (CA84374, years 5-9) was focused upon i) cloning and characterization of the DYN gene cluster from M. chersina, ii) development of genetic tools to address DYN biosynthesis in M. chersina, iii) initiating enediyne core biosynthetic studies, iv) structurally characterization of the CLM self-sacrifice resistance protein CalC, and v) the elucidation of key aryltetrasaccharide biosynthetic transformations (sugar N-oxidation, thiosugar formation and GT-catalyzed aryltetrasaccharide assembly). The successful completion of the majority of phase II aims enables the proposed course of study for this competitive renewal. Specifically, we will focus upon i) extending our understanding of enediyne core biosynthesis, ii) delineating the potential role of CalC in regulating CLM production in M. echinospora, iii) completing the study of key aryltetrasaccharide sugar nucleotide transformations (sulfur installation and sequential C-C alkylation of the N-alkyl dideoxypentose), iv) initiating an enediyne structural biology program and v) synthesizing and evaluating (neo)glycorandomized libraries of CLM and DYN.

Public Health Relevance

This is a second competitive renewal of a productive program ((CA84374) targeting the biosynthesis of 10-membered enediynes (calicheamicin and dynemicin) - a novel class of anticancer natural products. The program is anticipated to provide pioneering discoveries in enzyme-catalyzed chemistries, new tools for the chemical diversification of complex natural products and unique anticancer lead compounds.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
5R01CA084374-14
Application #
8451272
Study Section
Synthetic and Biological Chemistry B Study Section (SBCB)
Program Officer
Fu, Yali
Project Start
1999-12-01
Project End
2014-04-30
Budget Start
2013-05-01
Budget End
2014-04-30
Support Year
14
Fiscal Year
2013
Total Cost
$263,268
Indirect Cost
$82,944
Name
University of Kentucky
Department
Pharmacology
Type
Schools of Pharmacy
DUNS #
939017877
City
Lexington
State
KY
Country
United States
Zip Code
40506
Cao, Hongnan; Tan, Kemin; Wang, Fengbin et al. (2016) Structural dynamics of a methionine ?-lyase for calicheamicin biosynthesis: Rotation of the conserved tyrosine stacking with pyridoxal phosphate. Struct Dyn 3:034702
Elshahawi, Sherif I; Shaaban, Khaled A; Kharel, Madan K et al. (2015) A comprehensive review of glycosylated bacterial natural products. Chem Soc Rev 44:7591-697
Singh, Shanteri; Michalska, Karolina; Bigelow, Lance et al. (2015) Structural Characterization of CalS8, a TDP-?-D-Glucose Dehydrogenase Involved in Calicheamicin Aminodideoxypentose Biosynthesis. J Biol Chem 290:26249-58
Singh, Shanteri; Kim, Youngchang; Wang, Fengbin et al. (2015) Structural characterization of AtmS13, a putative sugar aminotransferase involved in indolocarbazole AT2433 aminopentose biosynthesis. Proteins 83:1547-54
Peltier-Pain, Pauline; Singh, Shanteri; Thorson, Jon S (2015) Characterization of Early Enzymes Involved in TDP-Aminodideoxypentose Biosynthesis en Route to Indolocarbazole AT2433. Chembiochem 16:2141-6
Wang, Fengbin; Singh, Shanteri; Xu, Weijun et al. (2015) Structural Basis for the Stereochemical Control of Amine Installation in Nucleotide Sugar Aminotransferases. ACS Chem Biol 10:2048-56
Wang, Fengbin; Singh, Shanteri; Zhang, Jianjun et al. (2014) Understanding molecular recognition of promiscuity of thermophilic methionine adenosyltransferase sMAT from SulfolobusĀ solfataricus. FEBS J 281:4224-39
Singh, Shanteri; Zhang, Jianjun; Huber, Tyler D et al. (2014) Facile chemoenzymatic strategies for the synthesis and utilization of S-adenosyl-(L)-methionine analogues. Angew Chem Int Ed Engl 53:3965-9
Elshahawi, Sherif I; Ramelot, Theresa A; Seetharaman, Jayaraman et al. (2014) Structure-guided functional characterization of enediyne self-sacrifice resistance proteins, CalU16 and CalU19. ACS Chem Biol 9:2347-58
Singh, Shanteri; Peltier-Pain, Pauline; Tonelli, Marco et al. (2014) A general NMR-based strategy for the in situ characterization of sugar-nucleotide-dependent biosynthetic pathways. Org Lett 16:3220-3

Showing the most recent 10 out of 59 publications