KEGG   PATHWAY: map00908Help
Entry
map00908                    Pathway                                

Name
Zeatin biosynthesis
Description
Zeatin is a member of the cytokinin family, a class of phytohormones involved in various processes of growth and development in plants. Most abundant cytokinins are adenine-type, where the N6 position of adenine is substituted with an isoprenoid, such as in zeatin, or an aromatic side chain, such as in kinetin. Zeatin can be synthesized in two different pathways: the tRNA pathway and the AMP pathway. In the tRNA pathway zeatin is a recycled product of isopentenylated tRNAs. In the AMP pathway zeatin is synthesized from an isopentenyl donor, dimethylallyl diphosphate (DMAPP), and AMP, ADP, or ATP by isopentenyltransferases. After synthesis cytokinins can be glucosylated.
Class
Metabolism; Metabolism of terpenoids and polyketides
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Pathway map
Zeatin biosynthesis
map00908

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Reference
  Authors
Kasahara H, Takei K, Ueda N, Hishiyama S, Yamaya T, Kamiya Y, Yamaguchi S, Sakakibara H.
  Title
Distinct isoprenoid origins of cis- and trans-zeatin biosyntheses in Arabidopsis.
  Journal
J Biol Chem 279:14049-54 (2004)
Reference
  Authors
Takei K, Sakakibara H, Sugiyama T.
  Title
Identification of genes encoding adenylate isopentenyltransferase, a cytokinin biosynthesis enzyme, in Arabidopsis thaliana.
  Journal
J Biol Chem 276:26405-10 (2001)
Reference
  Authors
Kakimoto T.
  Title
Identification of plant cytokinin biosynthetic enzymes as dimethylallyl diphosphate:ATP/ADP isopentenyltransferases.
  Journal
Plant Cell Physiol 42:677-85 (2001)
Reference
  Authors
Takei K, Yamaya T, Sakakibara H.
  Title
Arabidopsis CYP735A1 and CYP735A2 encode cytokinin hydroxylases that catalyze the biosynthesis of trans-Zeatin.
  Journal
J Biol Chem 279:41866-72 (2004)
Reference
  Authors
Hou B, Lim EK, Higgins GS, Bowles DJ.
  Title
N-glucosylation of cytokinins by glycosyltransferases of Arabidopsis thaliana.
  Journal
J Biol Chem 279:47822-32 (2004)
Reference
PMID:9874810
  Authors
Martin RC, Mok MC, Mok DW
  Title
Isolation of a cytokinin gene, ZOG1, encoding zeatin O-glucosyltransferase from Phaseolus lunatus.
  Journal
Proc Natl Acad Sci U S A 96:284-9 (1999)
Reference
  Authors
Martin RC, Mok MC, Mok DW
  Title
A gene encoding the cytokinin enzyme zeatin O-xylosyltransferase of Phaseolus vulgaris.
  Journal
Plant Physiol 120:553-8 (1999)
Reference
  Authors
Veach YK, Martin RC, Mok DW, Malbeck J, Vankova R, Mok MC
  Title
O-glucosylation of cis-zeatin in maize. Characterization of genes, enzymes, and endogenous cytokinins.
  Journal
Plant Physiol 131:1374-80 (2003)
Reference
  Authors
Werner T, Motyka V, Laucou V, Smets R, Van Onckelen H, Schmulling T
  Title
Cytokinin-deficient transgenic Arabidopsis plants show multiple developmental alterations indicating opposite functions of cytokinins in the regulation of shoot and root meristem activity.
  Journal
Plant Cell 15:2532-50 (2003)
Reference
  Authors
Miyawaki K, Tarkowski P, Matsumoto-Kitano M, Kato T, Sato S, Tarkowska D, Tabata S, Sandberg G, Kakimoto T
  Title
Roles of Arabidopsis ATP/ADP isopentenyltransferases and tRNA isopentenyltransferases in cytokinin biosynthesis.
  Journal
Proc Natl Acad Sci U S A 103:16598-603 (2006)
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