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Regulation of the kinase activity of the MIK GCK-like MAP4K by alternative splicing

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Abstract

Alternative splicing of introns is essential to ensure the complexity of mammalian genome functions. In particular, the generation of a high number of different isoforms by alternative splicing is an important characteristic of genes coding for signalling proteins such as mitogen activated protein kinases (MAPKs). This is thought to allow these proteins to transduce multiple stimuli in a highly regulated manner. Plant genes are also subjected to alternative splicing. Nevertheless, clear examples of the functional consequences of this phenomenon are still scarce in plants. MIK is a maize gene coding for a GCK-like MAP4K that can be activated by interaction with maize atypical receptor kinase (MARK), an atypical receptor kinase. Here we show that MIK is subjected to alternative splicing. Expression of MIK leads to, at least, 4 different mature mRNAs that accumulate with particular expression profiles during maize development. Our results show that the polypeptides encoded by the different MIK mRNAs display different kinase activity and are differentially activated by interaction with the MARK receptor. Two MIK isoforms display constitutive kinase activity, one isoform is inactive but can be activated by MARK, and the fourth MIK isoform is inactive and cannot be activated by MARK. Our results constitute a clear example of the biochemical consequences of alternative splicing in plants. The selective conservation during evolution of the intron–exon structure of the region coding for the regulator domain of MIK, as well as the maintenance in maize, rice and Arabidopsis of the alternative splicing of some of these introns, are strong indications of its functional importance.

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  1. Departament de Genètica Molecular, Laboratori de Genètica Molecular Vegetal CSIC-IRTA, Institut de Biologia Molecular de Barcelona (IBMB-CSIC), Jordi Girona 18, 08034, Barcelona, Spain

    Enric Castells, Pere Puigdomènech & Josep M. Casacuberta

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  1. Enric Castells
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  2. Pere Puigdomènech
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Correspondence to Josep M. Casacuberta.

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Castells, E., Puigdomènech, P. & Casacuberta, J.M. Regulation of the kinase activity of the MIK GCK-like MAP4K by alternative splicing. Plant Mol Biol 61, 747–756 (2006). https://doi.org/10.1007/s11103-006-0046-3

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