Abstract
A 154 bp polymerase chain reaction product, SBKIN154, showing 76–83% sequence identity with sucrose nonfermenting-1 (SNF1)-related protein kinase nucleotide sequences from other plant species was amplified from sugar beet storage root RNA. Southern blot analysis using SBKIN154 as a hybridisation probe suggested that sugar beet contains either a single-copy SNF1-related gene or a small gene family of highly conserved genes. An antibody raised to a heterologously-expressed fusion of the rye SNF1-related protein kinase, RKIN1, and maltose binding protein, recognised a protein of the expected size (Mr approx. 60,000) on western blots of storage root, stalk, leaf and root extracts. Measurements of SNF1-related activity were made using a specific peptide (SAMS) phosphorylation assay. Activity was highest (0.38 nmol min-1 mg-1 protein) in developing storage roots and lowest (0.035 nmol min-1 mg-1) in fibrous roots.
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Monger, W.A., Thomas, T.H., Purcell, P.C. et al. Identification of a sucrose nonfermenting-1-related protein kinase in sugar beet (Beta vulgaris L.). Plant Growth Regulation 22, 181–188 (1997). https://doi.org/10.1023/A:1005845605696
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DOI: https://doi.org/10.1023/A:1005845605696