About: Function of plant defense secondary metabolite in cytokinin degradation

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	The flavoenzyme cytokinin dehydrogenace (CKX) catalyzes an irreversible deactivation of plant hormones cytokinins through oxidative cleavage of the cytokinin side chain to Šeld adenine or adenosine and an aldehyde. In the catalytic cycle of CKX, the cytokinin-reduced flavin cofactor is reoxidized by a suitable electron acceptor. We have recently demonstrated that the oxidation products of natural hydroxamic acid 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA) function as effective electron acceptors of apoplastic CKX from maize. The stable oxidation product of DIMBOA reacting with peroxidase or laccase was identified as 4-nitrosoresorcinol 1-monomethyl ether (coniferron), which, however, is only a weak electron acceptor of CKX. Further analyses suggested formativ of transient free radicals that were estimated to reoxidize the cytokininreduced flavin cofactor of CKX with the rates comparable to those of flavin reduction. The flavoenzyme cytokinin dehydrogenace (CKX) catalyzes an irreversible deactivation of plant hormones cytokinins through oxidative cleavage of the cytokinin side chain to Šeld adenine or adenosine and an aldehyde. In the catalytic cycle of CKX, the cytokinin-reduced flavin cofactor is reoxidized by a suitable electron acceptor. We have recently demonstrated that the oxidation products of natural hydroxamic acid 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA) function as effective electron acceptors of apoplastic CKX from maize. The stable oxidation product of DIMBOA reacting with peroxidase or laccase was identified as 4-nitrosoresorcinol 1-monomethyl ether (coniferron), which, however, is only a weak electron acceptor of CKX. Further analyses suggested formativ of transient free radicals that were estimated to reoxidize the cytokininreduced flavin cofactor of CKX with the rates comparable to those of flavin reduction. (en)
Title	Function of plant defense secondary metabolite in cytokinin degradation Function of plant defense secondary metabolite in cytokinin degradation (en)
skos:prefLabel	Function of plant defense secondary metabolite in cytokinin degradation Function of plant defense secondary metabolite in cytokinin degradation (en)
skos:notation	RIV/61389030:_____/10:00359310!RIV11-GA0-61389030
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GA301/08/1649), P(GA522/05/0448), Z(AV0Z50380511), Z(MSM6198959216)
http://linked.open...iv/cisloPeriodika	5
http://linked.open...vai/riv/dodaniDat	2011
http://linked.open...aciTvurceVysledku	Frébortová, Jitka
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav experimentální botaniky AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	259930
http://linked.open...ai/riv/idVysledku	RIV/61389030:_____/10:00359310
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	cytokinin dehydrogenace; 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one; phenoxyl radiál (en)
http://linked.open.../riv/klicoveSlovo	2 4-benzoxazin-3-one 4-dihydroxy-7-methoxy-1 cytokinin dehydrogenace phenoxyl radiál
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[7B21925A42FA]
http://linked.open...i/riv/nazevZdroje	Plant Signalling & Behavior
http://linked.open...in/vavai/riv/obor	EF
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	1 (xsd:int)
http://linked.open...vavai/riv/projekt	Isolation and identification of physiological electron acceptor of plant cytokinin dehydrogenase and interaction with low molecular mass compounds Modulation of cell division of normal and cancer cells by cyclin-dependent kinase inhibitors
http://linked.open...UplatneniVysledku	2010
http://linked.open...v/svazekPeriodika	5
http://linked.open...iv/tvurceVysledku	Frébortová, Jitka
http://linked.open...n/vavai/riv/zamer	Mechanismy regulace růstu a vývoje rostlin na úrovni buněk, orgánů a celých organismů: fyziologické, genetické a molekulárně biologické základy Modulation of signalling and regulatory pathways in normal and cancer cells
issn	1559-2316
number of pages	3 (xsd:int)

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