Abstract
Sortase A (SrtA) is an enzyme obtained from Staphylococcus aureus that catalyzes site-specific transpeptidation of surface proteins to the bacterial cell membrane. SrtA recognizes an LPXTG amino acid motif and cleaves between the Thr and Gly to form a thioester-linked acyl–enzyme intermediate. The intermediate is resolved in the presence of a nucleophilic N-terminal polyglycine resulting in ligation of the acyl donor to the polyglycine acceptor. Here we describe the application of SrtA as a tool for the cyclization of disulfide-rich peptides. Reactions are typically tailored to each disulfide-rich peptide with optimal conditions producing yields of 40–50% cyclized peptide.
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Acknowledgments
This work was funded by project grant (APP1047857) to D.J.C and C.I.S. from the Australian National Health and Medical Research Council (NMHRC). C.I.S is an Australian Research Council (ARC) Future Fellow (FT160100055), D.J.C is an ARC Australian Laureate Fellow (FL150100146), and A.J.A is supported by a University of Queensland International postgraduate student scholarship. Special thanks to Prof David Liu (Department of Chemistry and Chemical Biology, Harvard University), for SrtA5° expression plasmid and to Mr. Olivier Cheneval, Dr. Soohyun Kwon, Mr. Thomas Dash (Institute for Molecular Bioscience, University of Queensland), and Mr. Alan Zhang (Centre for Advanced Imaging, University of Queensland) for lab notes and scientific discussions.
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Agwa, A.J., Craik, D.J., Schroeder, C.I. (2019). Cyclizing Disulfide-Rich Peptides Using Sortase A. In: Nuijens, T., Schmidt, M. (eds) Enzyme-Mediated Ligation Methods. Methods in Molecular Biology, vol 2012. Humana, New York, NY. https://doi.org/10.1007/978-1-4939-9546-2_3
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DOI: https://doi.org/10.1007/978-1-4939-9546-2_3
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