Characterization of a calmodulin-regulated Ca2+-dependent-protein-kinase-related protein kinase, AtCRK1, from Arabidopsis.
[No authors listed]
摘要
An AtCRK1 [Arabidopsis thaliana CDPK (Ca2+-dependent protein kinase)-related protein kinase 1] has been characterized molecularly and biochemically. AtCRK1 contains the kinase catalytic domain and a CaM (calmodulin)-binding site. Our results demonstrated that AtCRK1 could bind CaM in a Ca2+-dependent manner. This kinase phosphorylated itself and substrates such as histone IIIS and syntide-2 in a Ca2+-independent manner and the activity was stimulated by several CaM isoforms through its CaM-binding domain. This domain was localized within a stretch of 39 amino acid residues at positions from 403 to 441 with K(d)=67 nM for CaM binding. However, the stimulation amplification of the kinase activity of AtCRK1 by different CaM isoforms was similar.
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基因功能
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原始数据
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文献解读
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