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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Molecular cloning and cultivar specific expression of MAP kinases from Capsicum annuum.

Two MAP kinases, MK1 and MK2, were cloned from Capsicum annuum (pepper) cv. Subicho using a parsley MAP kinase gene as a heterologous probe. MK1 and MK2 encode stress-inducible protein kinases that can contribute to the response to wounding, UV-C, and cold. MK1 has a 92% amino acid identity with WIPK of tobacco. It was transcriptionally induced in response to wounding. In contrast, no detectable MK1 transcript was found in unwounded leaves of pepper. MK2 has a high level of amino acid homology to MAP kinases, such as NTF4 and SIPK and was constitutively expressed in all tissues. Both MK transcripts were downregulated by UV-C treatment. Each MK protein activation was independently wound-inducible in a cultivar dependent manner. MK1 is phosphorylated in cv. Pungchon but not cv. Subicho; whereas, the MK2 protein activation by wounding is restricted to cv. Subicho. In addition, de novo synthesis of the MK1 protein and tyrosine phosphorylation was rapidly and transiently induced in cv. Pungchon by wounding. In contrast, it is highly unlikely that the MK1 protein is produced in cv. Subicho, even though there is an abundant expression of MK1 mRNA after wounding in this cultivar. In Escherichia coli, which overexpresses MK1, autophosphorylation is observed at conserved threonine and tyrosine phosphorylation sites.[1]


  1. Molecular cloning and cultivar specific expression of MAP kinases from Capsicum annuum. Shin, H.J., Lee, D.E., Shin, D.H., Kim, K.U., Kim, H.Y., Ohashi, Y., Han, O., Baik, M.G., Back, K. Mol. Cells (2001) [Pubmed]
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