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  • Title: A germin-like protein of wheat leaf apoplast inhibits serine proteases.
    Author: Segarra CI, Casalongué CA, Pinedo ML, Ronchi VP, Conde RD.
    Journal: J Exp Bot; 2003 May; 54(386):1335-41. PubMed ID: 12709479.
    Abstract:
    A protein resistant to heat and proteolysis that inhibits serine proteases was isolated from wheat leaf apoplasts. Based on trypsin inhibition, its more active form was a 66-69 kDa oligomer. It was dissociated in an 18-21 kDa monomer having an amino terminal sequence identical to the Box A of germins and germin-like proteins. Like these proteins, it was glycosylated and showed manganese superoxide dismutase activity. The monomer displayed three forms when examined by 2D western blot: two of 19 kDa, pI 5.8 and 6.2; and one of 21 kDa, pI 5.8. It was found that the protein controls serine protease activity in the apoplast of plants challenged with the fungus Septoria tritici.
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