Diversity of stability, localization, interaction and control of downstream gene activity in the Maize Aux/IAA protein family

AUXIN/INDOLE-3-ACETIC ACID (Aux/IAA) proteins are central regulators of auxin signal transduction. They control many aspects of plant development, share a conserved domain structure and are localized in the nucleus. In the present study, five maize Aux/IAA proteins (ZmIAA2, ZmIAA11, ZmIAA15, ZmIAA20...

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Veröffentlicht in:PloS one 2014-09, Vol.9 (9), p.e107346-e107346
Hauptverfasser: Ludwig, Yvonne, Berendzen, Kenneth W, Xu, Changzheng, Piepho, Hans-Peter, Hochholdinger, Frank
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Xu, Changzheng
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Hochholdinger, Frank
description AUXIN/INDOLE-3-ACETIC ACID (Aux/IAA) proteins are central regulators of auxin signal transduction. They control many aspects of plant development, share a conserved domain structure and are localized in the nucleus. In the present study, five maize Aux/IAA proteins (ZmIAA2, ZmIAA11, ZmIAA15, ZmIAA20 and ZmIAA33) representing the evolutionary, phylogenetic and expression diversity of this gene family were characterized. Subcellular localization studies revealed that ZmIAA2, ZmIAA11 and ZmIAA15 are confined to the nucleus while ZmIAA20 and ZmIAA33 are localized in both the nucleus and the cytoplasm. Introduction of specific point mutations in the degron sequence (VGWPPV) of domain II by substituting the first proline by serine or the second proline by leucine stabilized the Aux/IAA proteins. While protein half-life times between ∼11 min (ZmIAA2) to ∼120 min (ZmIAA15) were observed in wild-type proteins, the mutated forms of all five proteins were almost as stable as GFP control proteins. Moreover, all five maize Aux/IAA proteins repressed downstream gene expression in luciferase assays to different degrees. In addition, bimolecular fluorescence complementation (BiFC) analyses demonstrated interaction of all five Aux/IAA proteins with RUM1 (ROOTLESS WITH UNDETECTABLE MERISTEM 1, ZmIAA10) while only ZmIAA15 and ZmIAA33 interacted with the RUM1 paralog RUL1 (RUM-LIKE 1, ZmIAA29). Moreover, ZmIAA11, ZmIAA15 ZmIAA33 displayed homotypic interaction. Hence, despite their conserved domain structure, maize Aux/IAA proteins display a significant variability in their molecular characteristics which is likely associated with the wide spectrum of their developmental functions.
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Moreover, all five maize Aux/IAA proteins repressed downstream gene expression in luciferase assays to different degrees. In addition, bimolecular fluorescence complementation (BiFC) analyses demonstrated interaction of all five Aux/IAA proteins with RUM1 (ROOTLESS WITH UNDETECTABLE MERISTEM 1, ZmIAA10) while only ZmIAA15 and ZmIAA33 interacted with the RUM1 paralog RUL1 (RUM-LIKE 1, ZmIAA29). Moreover, ZmIAA11, ZmIAA15 ZmIAA33 displayed homotypic interaction. Hence, despite their conserved domain structure, maize Aux/IAA proteins display a significant variability in their molecular characteristics which is likely associated with the wide spectrum of their developmental functions.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>25203637</pmid><doi>10.1371/journal.pone.0107346</doi><oa>free_for_read</oa></addata></record>
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subjects Acetic acid
Apoptosis
Arabidopsis
Arabidopsis - genetics
Arabidopsis - metabolism
Arabidopsis Proteins - genetics
Arabidopsis Proteins - metabolism
Arabidopsis thaliana
Biology and Life Sciences
Cell Nucleus - metabolism
Cellular signal transduction
Complementation
Control stability
Corn
Crop science
Cytoplasm
Cytoplasm - metabolism
Fluorescence
Gene expression
Gene Expression Regulation, Plant - genetics
Gene mutation
Genomes
Genomics
Half-Life
Indoleacetic acid
Indoleacetic Acids - metabolism
Leucine
Localization
Molecular chains
Mutation
Nuclei
Oryza
Phylogenetics
Phylogeny
Proline
Proteins
Regulators
Serine
Transduction
Zea mays - genetics
Zea mays - metabolism
title Diversity of stability, localization, interaction and control of downstream gene activity in the Maize Aux/IAA protein family
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