Recombinant Expression and Phenotypic Screening of a Bioactive Cyclotide Against ?-Synuclein-Induced Cytotoxicity in Baker's Yeast.

ABSTRACT: We report for the first time the recombinant expression of fully folded bioactive cyclotides inside live yeast cells by using intracellular protein trans-splicing in combination with a highly efficient split-intein. This approach was successfully used to produce the naturally occurring cyclotide MCoTI-I and the engineered bioactive cyclotide MCoCP4. Cyclotide MCoCP4 was shown to reduce the toxicity of human ?-synuclein in live yeast cells. Cyclotide MCoCP4 was selected by phenotypic screening from cells transformed with a mixture of plasmids encoding MCoCP4 and inactive cyclotide MCoTI-I in a ratio of 1:5×10(4). This demonstrates the potential for using yeast to perform phenotypic screening of genetically encoded cyclotide-based libraries in eukaryotic cells.

SUBMITTER: Jagadish K 

PROVIDER: S-EPMC4545262 | biostudies-literature | 2015 Jul

REPOSITORIES: biostudies-literature