Development of a human light chain variable domain (V(L)) intracellular antibody specific for the amino terminus of huntingtin via yeast surface display

Journal of Molecular Biology
David ColbyK Dane Wittrup

Abstract

Intracellular antibodies (intrabodies) provide an attractive means for manipulating intracellular protein function, both for research and potentially for therapy. A challenge in the isolation of effective intrabodies is the ability to find molecules that exhibit sufficient binding affinity and stability when expressed in the reducing environment of the cytoplasm. Here, we have used yeast surface display of proteins to isolate novel scFv clones against huntingtin from a non-immune human antibody library. We then applied yeast surface display to affinity mature this scFv pool and analyze the location of the binding site of the mutant with the highest affinity. Interestingly, the paratope was mapped exclusively to the variable light chain domain of the scFv. A single domain antibody was constructed consisting solely of this variable light chain domain, and was found to retain full binding activity to huntingtin. Cytoplasmic expression levels in yeast of the single domain were at least fivefold higher than the scFv. The ability of the single-domain intrabody to inhibit huntingtin aggregation, which has been implicated in the pathogenesis of Huntington's disease (HD), was confirmed in a cell-free in vitro assay as well as in a mamma...Continue Reading

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