Secretion of a heat-stable fungal beta-glucanase from transgenic, suspension-cultured barley cells

Kristian Aspegren, Leena Mannonen, Anneli Ritala, Riitta Puupponen-Pimiä, Ulrika Kurten, Marjatta Salmenkallio-Marttila, Veli Kauppinen, Teemu Teeri

    Research output: Contribution to journalArticleScientificpeer-review

    28 Citations (Scopus)


    Transgenic plant cell cultures have a potential for production and secretion of important proteins and peptides. To assess the possibilities of using a stable barley suspension culture for secretion of heterologous proteins in active form, we expressed the cDNA of the thermostableβ-glucanase (EGI) ofTrichoderma reesei in barley suspension cells. The cDNA coding for EGI and its signal sequence was placed under the control of the CaMV 35S promoter and the construction was transferred to the cells by particle bombardment. Stably transformed lines were obtained by selecting for a cotransformed antibiotic resistance marker. The expression of EGI cDNA led to accumulation of EGI in the culture medium, as shown by analysis with EGI-specific antibodies. Enzymatic assays confirmed that the EGI secreted by the suspension cells retained its activity and thermostable character. Furthermore, it was shown that the enzyme produced by the transgenic suspension culture could be used for degradation of solubleβ-glucans during mashing.
    Original languageEnglish
    Pages (from-to)91-99
    JournalMolecular Breeding
    Issue number1
    Publication statusPublished - 1995
    MoE publication typeA1 Journal article-refereed


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