Recombinant Expression of Cyclotides Using Expressed Protein Ligation
Overview
Affiliations
Cyclotides are naturally occurring microproteins (≈30 residues long) present in several families of plants. All cyclotides share a unique head-to-tail circular knotted topology containing three disulfide bridges forming a cystine knot topology. Cyclotides possess high stability to chemical, physical, and biological degradation and have been reported to cross cellular membranes. In addition, naturally occurring and engineered cyclotides have shown to possess various pharmacologically relevant activities. These unique features make the cyclotide scaffold an excellent tool for the design of novel peptide-based therapeutics by using molecular evolution and/or peptide epitope grafting techniques. In this chapter, we provide protocols to recombinantly produce a natively folded cyclotide making use of a standard bacterial expression system in combination with an intein-mediated backbone cyclization with concomitant oxidative folding.
Small and Versatile Cyclotides as Anti-infective Agents.
Candido E, Gasparetto L, Luchi L, Pimentel J, Cardoso M, Macedo M ACS Infect Dis. 2025; 11(2):386-397.
PMID: 39842000 PMC: 11833872. DOI: 10.1021/acsinfecdis.4c00957.
Efficient splicing of the CPE intein derived from directed evolution of the PRP8 intein.
Zhan Q, Shi C, Jiang Y, Gao X, Lin Y Acta Biochim Biophys Sin (Shanghai). 2023; 55(8):1310-1318.
PMID: 37489009 PMC: 10448054. DOI: 10.3724/abbs.2023135.
Chaudhuri D, Lu T, Jacob B, Abraham S, Shankar P, Poss M J Control Release. 2023; 359:26-32.
PMID: 37236320 PMC: 10527528. DOI: 10.1016/j.jconrel.2023.05.026.
Engineered Cyclotides with Potent Broad in Vitro and in Vivo Antimicrobial Activity.
Ganesan R, Dughbaj M, Ramirez L, Beringer S, Aboye T, Shekhtman A Chemistry. 2021; 27(49):12702-12708.
PMID: 34159664 PMC: 8410672. DOI: 10.1002/chem.202101438.