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| Description
| - Cytokinins, which are central regulators of cell division and differentiation in plants, are adenine derivatives carrying an isopentenyl side chain that may be hydroxylated. Plants have two classes of isopentenyltransferases (IPTs) acting on the adenine moiety: ATP/ ADP isopentenyltransferases (in Arabidopsis thaliana, AtIPT1, 3, 4-8) and tRNA IPTs (in Arabidopsis, AtIPT2 and 9). ATP/ADP IPTs are likely to be responsible for the bulk of cytokinin synthesis, whereas it is thought that cis-zeatin (cZ)-type cytokinins are produced possibly by degradation of cis-hydroxy isopentenyl tRNAs, which are formed by tRNA IPTs. However, these routes are largely hypothetical because of lack of in vivo evidence, because the critical experiment necessary to verify these routes, namely the production and analysis of mutants lacking AtIPTs, has not yet been described. We isolated null mutants for all members of the ATP/ADP IPT and tRNA IPT gene families in Arabidopsis. Notably, our work demonstrates that the atipt1 3
- Cytokinins, which are central regulators of cell division and differentiation in plants, are adenine derivatives carrying an isopentenyl side chain that may be hydroxylated. Plants have two classes of isopentenyltransferases (IPTs) acting on the adenine moiety: ATP/ ADP isopentenyltransferases (in Arabidopsis thaliana, AtIPT1, 3, 4-8) and tRNA IPTs (in Arabidopsis, AtIPT2 and 9). ATP/ADP IPTs are likely to be responsible for the bulk of cytokinin synthesis, whereas it is thought that cis-zeatin (cZ)-type cytokinins are produced possibly by degradation of cis-hydroxy isopentenyl tRNAs, which are formed by tRNA IPTs. However, these routes are largely hypothetical because of lack of in vivo evidence, because the critical experiment necessary to verify these routes, namely the production and analysis of mutants lacking AtIPTs, has not yet been described. We isolated null mutants for all members of the ATP/ADP IPT and tRNA IPT gene families in Arabidopsis. Notably, our work demonstrates that the atipt1 3 (en)
- U rostlin existují dva typy isopentenyltransferas (IPT), které působí na molekulu adeninu: jsou to ATP/ADP isopentenyltransferasy (v Arabidopsis thaliana, AtIPT1, 3, 4-8) a tRNA isopentenyltransferasy (AtIPT 2 a 9). První se podílí na biosyntéze většiny cytokininů, druhý typ zřejmě produkuje cytokininy podobné cis-zeatinu. Pro objasnění role isopentenyltransferasy byly připraveny nulové mutanty A. thaliana pro všechny členy genových rodin IPT. Čtverný mutant atipt1 3 5 7 obshoval výrazně snížený obsah isopentenyladeninu, trans-zeatinu a odvozených derivátů, naopak produkoval vyšší hladinu ciz-zeatinových cytokininů. Dvojitý mutant atipt2 9 postrádal cis-zeatinové cytokininy a jejich prekurzorové tRNA. Výsledky tak potvrzují výše zmíněnou rozdílnou roli obou typů enzymů. (cs)
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| Title
| - Roles of Arabidopsis ATP/ADP isopentenyltransferases and tRNA isopentenyltransferases in cytokinin biosynthesis
- Roles of Arabidopsis ATP/ADP isopentenyltransferases and tRNA isopentenyltransferases in cytokinin biosynthesis (en)
- Úloha ATP/ADP isopentenyltransferas a tRNA isopentenyltransferas v biosyntéze cytokininů (cs)
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| skos:prefLabel
| - Roles of Arabidopsis ATP/ADP isopentenyltransferases and tRNA isopentenyltransferases in cytokinin biosynthesis
- Roles of Arabidopsis ATP/ADP isopentenyltransferases and tRNA isopentenyltransferases in cytokinin biosynthesis (en)
- Úloha ATP/ADP isopentenyltransferas a tRNA isopentenyltransferas v biosyntéze cytokininů (cs)
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| skos:notation
| - RIV/61989592:15310/06:00002799!RIV07-MSM-15310___
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| http://linked.open.../vavai/riv/strany
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| http://linked.open...avai/riv/aktivita
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| http://linked.open...avai/riv/aktivity
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| http://linked.open...iv/cisloPeriodika
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| http://linked.open...vai/riv/dodaniDat
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| http://linked.open...aciTvurceVysledku
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| http://linked.open.../riv/druhVysledku
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| http://linked.open...iv/duvernostUdaju
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| http://linked.open...titaPredkladatele
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| http://linked.open...dnocenehoVysledku
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| http://linked.open...ai/riv/idVysledku
| - RIV/61989592:15310/06:00002799
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| http://linked.open...riv/jazykVysledku
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| http://linked.open.../riv/klicovaSlova
| - AGROBACTERIUM-TUMEFACIENS; HISTIDINE KINASE; IDENTIFICATION; RECEPTOR; ZEATIN; PLANT; GENE; THALIANA; GROWTH; ENZYME (en)
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| http://linked.open.../riv/klicoveSlovo
| |
| http://linked.open...odStatuVydavatele
| - US - Spojené státy americké
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| http://linked.open...ontrolniKodProRIV
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| http://linked.open...i/riv/nazevZdroje
| - Proceedings of the National Academy of Sciences of the USA
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| http://linked.open...in/vavai/riv/obor
| |
| http://linked.open...ichTvurcuVysledku
| |
| http://linked.open...cetTvurcuVysledku
| |
| http://linked.open...UplatneniVysledku
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| http://linked.open...v/svazekPeriodika
| |
| http://linked.open...iv/tvurceVysledku
| - Tarkowská, Danuše
- Tarkowski, Petr
- Kakimoto, Tatsuo
- Sandberg, Göran
- Kato, Tomohiko
- Matsumoto-kitano, Miho
- Miyawaki, Kaori
- Sato, Shushei
- Tabata, Satoshi
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| http://linked.open...n/vavai/riv/zamer
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| issn
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| number of pages
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| http://localhost/t...ganizacniJednotka
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