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. 1995 Nov;109(3):973–981. doi: 10.1104/pp.109.3.973

Sugar-Induced Increase of Calcium-Dependent Protein Kinases Associated with the Plasma Membrane in Leaf Tissues of Tobacco.

Ma Ohto 1, K Nakamura 1
PMCID: PMC161399  PMID: 12228646

Abstract

The sugar-inducible expression of genes for sporamin and [beta]-amylase in leaf explants of sweet potato (Ipomoea batatas) and that of a [beta]-glucuronidase-fusion gene, with the promoter of the gene for [beta]-amylase in leaves of tobacco (Nicotiana tabacum), requires Ca2+ signaling (M. Ohto, K. Hayashi, M. Isobe, K. Nakamura [1995] Plant J 7: 297-307), and it was inhibited by staurosporin and K252a, inhibitors of protein kinases. Autophosphorylation activities of several potential protein kinases in leaves of tobacco were significantly higher in younger leaves than in mature leaves. However, the autophosphorylation activities of these proteins in mature leaves, especially those of the major autophosphorylatable proteins with apparent molecular masses of 56 and 54 kD, increased upon treatment of leaf discs with a 0.3 M solution of sucrose, glucose, or fructose, did not increase with sorbitol or mannitol treatments, and the increase by sucrose was inhibited by cycloheximide. Autophosphorylation of the 56- and 54-kD protein in vitro was dependent on Ca2+ and inhibited by staurosporine, K-252a, and by W-7. These results suggest that they belong to the family of calcium-dependent protein kinases. They were concentrated in the plasma membrane fraction and were released from membrane vesicles by high salt or with sodium carbonate. The possible functions of these sugar-inducible calcium-dependent protein kinases associated with the plasma membrane are discussed.

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Selected References

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