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Novel thidiazuron-derived inhibitors of cytokinin oxidase/dehydrogenase
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SYSNO ASEP 0463803 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Novel thidiazuron-derived inhibitors of cytokinin oxidase/dehydrogenase Author(s) Nisler, Jaroslav (UEB-Q) RID, ORCID
Kopečný, D. (CZ)
Končitíková, R. (CZ)
Zatloukal, Marek (UEB-Q) ORCID
Bazgier, Václav (UEB-Q) ORCID, RID
Berka, K. (CZ)
Zalabák, D. (CZ)
Briozzo, P. (FR)
Strnad, Miroslav (UEB-Q) RID, ORCID
Spíchal, Lukáš (UEB-Q) RID, ORCIDSource Title Plant Molecular Biology. - : Springer - ISSN 0167-4412
Roč. 92, 1-2 (2016), s. 235-248Number of pages 14 s. Language eng - English Country NL - Netherlands Keywords Cytokinin oxidase/dehydrogenase ; Crystal structure ; Molecular docking Subject RIV EB - Genetics ; Molecular Biology R&D Projects LO1204 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GA15-22322S GA ČR - Czech Science Foundation (CSF) Institutional support UEB-Q - RVO:61389030 UT WOS 000382336500016 DOI 10.1007/s11103-016-0509-0 Annotation Two new TDZ derivatives (HETDZ and 3FMTDZ) are very potent inhibitors of CKX and are promising candidates for in vivo studies.
Cytokinin hormones regulate a wide range of essential processes in plants. Thidiazuron (N-phenyl-N'-1,2,3-thiadiazol-5-yl urea, TDZ), formerly registered as a cotton defoliant, is a well known inhibitor of cytokinin oxidase/dehydrogenase (CKX), an enzyme catalyzing the degradation of cytokinins. TDZ thus increases the lifetime of cytokinins and their effects in plants. We used in silico modeling to design, synthesize and characterize twenty new TDZ derivatives with improved inhibitory properties. Two compounds, namely 1-[1,2,3]thiadiazol-5-yl-3-(3-trifluoromethoxy-phenyl)urea (3FMTDZ) and 1-[2-(2-hydroxyethyl)phenyl]-3-(1,2,3-thiadiazol-5-yl)urea (HETDZ), displayed up to 15-fold lower IC (50) values compared with TDZ for AtCKX2 from Arabidopsis thaliana and ZmCKX1 and ZmCKX4a from Zea mays. Binding modes of 3FMTDZ and HETDZ were analyzed by X-ray crystallography. Crystal structure complexes, solved at 2.0 resolution, revealed that HETDZ and 3FMTDZ bound differently in the active site of ZmCKX4a: the thiadiazolyl ring of 3FMTDZ was positioned over the isoalloxazine ring of FAD, whereas that of HETDZ had the opposite orientation, pointing toward the entrance of the active site. The compounds were further tested for cytokinin activity in several cytokinin bioassays. We suggest that the combination of simple synthesis, lowered cytokinin activity, and enhanced inhibitory effects on CKX isoforms, makes 3FMTDZ and HETDZ suitable candidates for in vivo studies.Workplace Institute of Experimental Botany Contact David Klier, knihovna@ueb.cas.cz, Tel.: 220 390 469 Year of Publishing 2017
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