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Early Auxin-Induced Genes Encode Short-Lived Nuclear Proteins

Steffen Abel, Paul W. Oeller and Athanasios Theologis
Proceedings of the National Academy of Sciences of the United States of America
Vol. 91, No. 1 (Jan. 4, 1994), pp. 326-330
Stable URL: http://www.jstor.org/stable/2363793
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Early Auxin-Induced Genes Encode Short-Lived Nuclear Proteins
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Abstract

The plant growth hormone indoleacetic acid (IAA) transcriptionally activates gene expression in plants. Some of the genes whose expression is induced by IAA encode a family of proteins in pea (PS-IAA4 and PS-IAA6) and Arabidopsis (IAA1 and IAA2) that contain putative nuclear localization signals that direct a β-glucuronidase reporter protein into the nucleus. Pulse-chase and immunoprecipitation experiments have defined the t1/2 of the PS-IAA4 and PS-IAA6 proteins to be 8 and 6 min, respectively. Their most prominent feature is the presence of a βαα motif similar to the β-sheet DNA-binding domain found in prokaryotic repressors of the Arc family. Based on these data, we suggest that plant tissues express short-lived nuclear proteins as a primary response to IAA. We propose that these proteins act as activators or repressors of genes responsible for mediating the various auxin responses.

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