Journal
CHEMBIOCHEM
Volume 13, Issue 3, Pages 371-380Publisher
WILEY-BLACKWELL
DOI: 10.1002/cbic.201100702
Keywords
antimicrobial peptides; biosynthesis; genetic engineering; lasso peptides; microcin J25
Funding
- ANR [BLAN-NT09-692063]
- TGE RMN THC [Fr3050]
Ask authors/readers for more resources
Microcin J25 is a potent antibacterial peptide produced by Escherichia coli AY25. It displays a lasso structure, which consists of a knot involving an N-terminal macrolactam ring through which the C-terminal tail is threaded and sterically trapped. In this study, we rationally designed and performed site-specific mutations in order to pinpoint the sequence determinants of the lasso topology. Structures of the resulting variants were analysed by a combination of methods (mass spectrometry, NMR spectroscopy, enzymatic digestion), and correlated to the antibacterial activity. The selected mutations resulted in the production of branched-cyclic or lasso variants. The C-terminal residues below the ring (Tyr20, Gly21) and the size of the macrolactam ring were revealed to be critical for both the lasso scaffold and bioactivity, while shortening the loop region (Tyr9Ser18) or extending the C-terminal tail below the ring did not alter the lasso structure, but differentially affected the antibacterial activity. These results provide new insights for the bioengineering of antibacterial agents using a lasso peptide as template.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available