Plant Physiol. Drug Metab Dispos
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PLANT PHYSIOLOGY , Vol 112, Issue 1 371-378, Copyright © 1996 by American Society of Plant Biologists

BIOCHEMISTRY AND ENZYMOLOGY

Biotin Synthase from Arabidopsis thaliana (cDNA Isolation and Characterization of Gene Expression)

D. A. Patton, M. Johnson and E. R. Ward
Ciba Agricultural Biotechnology, 3054 Cornwallis Road, Research Triangle Park, North Carolina 27709

The full-length BIO2 cDNA from Arabidopsis thaliana was isolated using an expressed sequence tag that was homologous to the Escherichia coli biotin synthase gene (BioB). Comparisons of the deduced amino acid sequence from BIO2 with bacterial and yeast biotin synthase homologs revealed a high degree of sequence similarity. The amino terminus of the predicted BIO2 protein contains a stretch of hydrophobic residues similar in composition to transit peptide sequences. BIO2 is a single-copy nuclear gene in Arabidopsis that is expressed at high levels in the tissues of immature plants. Expression of BIO2 was higher in the light relative to dark and was induced 5-fold during biotin-limited conditions. These results demonstrate that expression of at least one gene in this pathway is regulated in response to developmental, environmental, and biochemical stimuli.


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Copyright © 1996 by the American Society of Plant Biologists