De novo folding of GFP fusion proteins

High efficiency in eukaryotes but not in bacteria

Hung Chun Chang, Christian M. Kaiser, F. Ulrich Hartl, José M. Barral

    Research output: Contribution to journalArticle

    70 Citations (Scopus)

    Abstract

    Eukaryotic genomes encode a considerably higher fraction of multi-domain proteins than their prokaryotic counterparts. It has been postulated that efficient co-translational and sequential domain folding has facilitated the explosive evolution of multi-domain proteins in eukaryotes by the recombination of pre-existent domains. Here, we tested whether eukaryotes and bacteria differ generally in the folding efficiency of multi-domain proteins generated by domain recombination. To this end, we compared the folding behavior of a series of recombinant proteins comprised of green fluorescent protein (GFP) fused to four different robustly folding proteins through six different linkers upon expression in Escherichia coli and the yeast Saccharomyces cerevisiae. We found that, unlike yeast, bacteria are remarkably inefficient at folding these fusion proteins, even at comparable levels of expression. In vitro and in vivo folding experiments demonstrate that the GFP domain imposes significant constraints on de novo folding of its fusion partners in bacteria, consistent with a largely post-translational folding mechanism. This behavior may result from an interference of GFP with adjacent domains during folding due to the particular topology of the β-barrel GFP structure. By following the accumulation of enzymatic activity, we found that the rate of appearance of correctly folded fusion protein per ribosome is indeed considerably higher in yeast than in bacteria.

    Original languageEnglish (US)
    Pages (from-to)397-409
    Number of pages13
    JournalJournal of Molecular Biology
    Volume353
    Issue number2
    DOIs
    StatePublished - Oct 21 2005

    Fingerprint

    Green Fluorescent Proteins
    Eukaryota
    Bacteria
    Yeasts
    Protein Folding
    Genetic Recombination
    Proteins
    Ribosomes
    Recombinant Proteins
    Saccharomyces cerevisiae
    Genome
    Escherichia coli
    Protein Domains

    Keywords

    • E. coli
    • GFP
    • Multi-domain proteins
    • Protein folding
    • S. cerevisiae

    ASJC Scopus subject areas

    • Virology

    Cite this

    De novo folding of GFP fusion proteins : High efficiency in eukaryotes but not in bacteria. / Chang, Hung Chun; Kaiser, Christian M.; Hartl, F. Ulrich; Barral, José M.

    In: Journal of Molecular Biology, Vol. 353, No. 2, 21.10.2005, p. 397-409.

    Research output: Contribution to journalArticle

    Chang, Hung Chun ; Kaiser, Christian M. ; Hartl, F. Ulrich ; Barral, José M. / De novo folding of GFP fusion proteins : High efficiency in eukaryotes but not in bacteria. In: Journal of Molecular Biology. 2005 ; Vol. 353, No. 2. pp. 397-409.
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