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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
Published by: National Academy of Sciences
Stable URL: http://www.jstor.org/stable/2363793
Page Count: 5
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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.
Proceedings of the National Academy of Sciences of the United States of America © 1994 National Academy of Sciences