Abstract
Structurally, butelase 1 is a cysteine protease of the asparaginyl endoprotease (AEP) family, but functionally, it displays intense Asn/Asp-specific (Asx) ligase activity and is virtually devoid of protease activity. Butelase 1 recognizes specifically a C-terminal Asx-containing tripeptide motif, Asx-His-Val, to form an Asx-Xaa peptide bond (Xaa = any amino acid), either intramolecularly or intermolecularly, resulting in cyclic peptides or site-specific modified peptides/proteins, respectively. Our work in the past 4 years has validated that butelase 1 is a potent and versatile tool for peptide and protein modification. Here we describe our protocols using butelase 1 for efficient and site-specific peptide and protein ligation, N-terminal labeling, preparation of thioesters, and bioconjugation of dendrimers. Additionally, we provide an example using butelase 1 for protein cyclization in combination with genetic code expansion in order to incorporate unnatural building blocks.
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Acknowledgments
This research was supported by Academic Research Grant Tier 3 (MOE2016-T3-1-003) from Singapore Ministry of Education (MOE).
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Hemu, X., Zhang, X., Bi, X., Liu, CF., Tam, J.P. (2019). Butelase 1-Mediated Ligation of Peptides and Proteins. 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_6
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