Plant plasma membrane 14-3-3 proteins differ in solubility and form fusicoccin-dependent complexes

H.A.A.J. Korthout, A.H. de Boer

    Research output: Contribution to JournalArticleAcademicpeer-review

    Abstract

    The binding protein for the phytotoxin fusicoccin belongs to the class of highly conserved 14-3-3 proteins. A general principle for the mode of action of 14-3-3 proteins is that they serve as docking clamps in order to facilitate protein interactions. This implies that 14-3-3 proteins may behave according to the proteins they interact with. Plasma membrane (PM) 14-3-3 proteins from oat roots indeed exhibited different properties, for example with respect to detergent solubility. The most abundant 14-3-3's with apparent molecular masses of 30 and 31 kDa, could be largely solubilized from the plasma membrane in high detergent buffer. However, part of these solubilized 14-3-3's precipitated when the detergent concentration was reduced. Moreover, a minor 35 kDa 14-3-3 protein was soluble in high detergent buffer but also completely precipitated at low detergent buffer. We present evidence that this 35 kDa 14-3-3 protein is phosphorylated and that the lower mobility in SDS-PAGE is likely to be due to binding of Ca
    Original languageEnglish
    Pages (from-to)357-365
    Number of pages8
    JournalPlant Physiology and Biochemistry
    Volume36
    Issue number5
    DOIs
    Publication statusPublished - 1998

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