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  • Title: Heterologous signal peptide processing in fusion interferon synthesis by engineered L-forms of Proteus mirabilis.
    Author: Laplace F, Egerer R, Gumpert J, Kraft R, Kostka S, Malke H.
    Journal: FEMS Microbiol Lett; 1989 May; 50(1-2):59-63. PubMed ID: 2661322.
    Abstract:
    A recombinant DNA Proteus mirabilis L-form expression system, LVI (pJS127), was used to synthesize human fusion interferon alpha 1 (f-IFN-alpha 1). In the expression plasmid used, the complete coding sequence of IFN-alpha 1 was linked to the streptococcal speA promoter and the 5' end of the speA structural gene including its signal sequence coding region. LVI (pJS127) was capable of complete secretion into the culture medium of biologically active f-IFN-alpha 1 whose identity was confirmed by immunological and chemical evidence. In particular, bacterial L-forms were for the first time shown to be capable of correct signal peptide processing, as determined by N-terminal sequencing of the secreted f-IFN.
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