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THE PLANT CELL, Vol 1, Issue 1 81-93, Copyright © 1989 by American Society of Plant Biologists
Strong Cellular Preference in the Expression of a Housekeeping Gene of Arabidopsis thaliana Encoding S-Adenosylmethionine Synthetase
J. Peleman, W. Boerjan, G. Engler, J. Seurinck, J. Botterman, T. Alliotte, M. Van Montagu and D. Inze
Laboratorium voor Genetica, Rijksuniversiteit Gent, K.L. Ledeganckstraat 35, B-9000 Gent, Belgium
S-Adenosylmethionine serves as a methyl group donor in numerous
transmethylation reactions and plays a role in the biosynthesis of
polyamines and ethylene. We have cloned and sequenced an
S-adenosylmethionine synthetase gene (sam-1) of Arabidopsis thaliana. The
deduced polypeptide sequence of the enzyme has extensive homology with the
corresponding enzymes of Escherichia coli and yeast. Genomic hybridization
indicates the presence of two adenosylmethionine synthetase genes per
haploid Arabidopsis genome. RNA gel blot analysis shows that
adenosylmethionine synthetase mRNA levels are high in stems and roots,
correlating well with the higher enzyme activity in stems, compared with
leaves. Histochemical analysis of transgenic Arabidopsis plants transformed
with a chimeric [beta]-glucuronidase gene, under the control of 748-base
pair 5[prime] sequences of the sam-1 gene, demonstrates that the gene is
expressed primarily in vascular tissues. In addition, high expression was
observed in sclerenchyma and in the root cortex. A hypothesis for the
strong cellular preference in the expression of the sam-1 gene is
presented.
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