Biotin synthase from Arabidopsis thaliana. cDNA isolation and characterization of gene expression.
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 bio-chemical stimuli.
Patton
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Ciba Agricultural Biotechnology, Research Triangle Park, North Carolina 27709, USA. pattond@am.abru.cg.com
Johnson
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M
Ward
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D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000201:enzymology* / Q000235:genetics; D001419:Bacteria / Q000201:enzymology; D001483:Base Sequence; D003001:Cloning, Molecular; D018076:DNA, Complementary; D004926:Escherichia coli; D015870:Gene Expression; D005816:Genetic Complementation Test; D008969:Molecular Sequence Data; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000737:chemistry; D017386:Sequence Homology, Amino Acid; D016324:Sequence Tagged Sites; D013466:Sulfurtransferases / Q000096:biosynthesis* / Q000737:chemistry / Q000235:genetics
D018076:DNA, Complementary; D011994:Recombinant Proteins; D013466:Sulfurtransferases; C057985:biotin synthetase