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Comparative Study
. 1994 Jul 5;91(14):6649-53.
doi: 10.1073/pnas.91.14.6649.

Differential regulation of an auxin-producing nitrilase gene family in Arabidopsis thaliana

B Bartel  1 , G R Fink
Affiliations
Comparative Study

Differential regulation of an auxin-producing nitrilase gene family in Arabidopsis thaliana

B Bartel et al. Proc Natl Acad Sci U S A. .

Abstract

Nitrilases (nitrile aminohydrolase, EC 3.5.5.1) convert nitriles to carboxylic acids. We report the cloning, characterization, and expression patterns of four Arabidopsis thaliana nitrilase genes (NIT1-4), one of which was previously described [Bartling, D., Seedorf, M., Mithöfer, A. & Weiler, E. W. (1992) Eur. J. Biochem. 205, 417-424]. The nitrilase genes encode very similar proteins that hydrolyze indole-3-acetonitrile to the phytohormone indole-3-acetic acid in vitro, and three of the four genes are tandemly arranged on chromosome III. Northern analysis using gene-specific probes and analysis of transgenic plants containing promoter-reporter gene fusions indicate that the four genes are differentially regulated. NIT2 expression is specifically induced around lesions caused by bacterial pathogen infiltration. The sites of nitrilase expression may represent sites of auxin biosynthesis in A. thaliana.

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