A maize cytokinin gene encoding an O-glucosyltransferase specific to cis-zeatin

Proceedings of the National Academy of Sciences of the United States of America
R C MartinD W Mok

Abstract

Zeatin is a naturally occurring cytokinin. Biosynthesis and metabolism studies of zeatin have been directed mostly at the trans isomer, although cis-zeatin and its riboside occur as major components in some plant species. It is not known whether parallel regulatory pathways exist for the two isomers. Based on the sequence of the gene ZOG1 encoding a trans-zeatin O-glucosyltransferase from Phaseolus (EC ), a cis-zeatin-specific O-glucosyltransferase was isolated from maize. This gene, cisZOG1, contains an ORF of 1,401 nucleotides encoding a protein of 51.1 kDa with 41% identity to the Phaseolus ZOG1 protein. Unexpectedly, the maize enzyme recognizes as substrates cis-zeatin and UDP-glucose but not cis-ribosylzeatin, trans-zeatin, or trans-ribosylzeatin. This finding indicates the existence of cis-specific regulatory elements in plants and suggests that cis-zeatin and derivatives may be more important in cytokinin homeostasis than currently recognized.

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Citations

Oct 1, 1987·Molecular and Cellular Endocrinology·B Lutz-BucherB Koch
Jun 3, 2008·Journal of Experimental Botany·Albert Pineda RodoMachteld C Mok
Feb 16, 2011·Journal of Experimental Botany·Ivo FrébortPetr Galuszka
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