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. Author manuscript; available in PMC: 2010 Sep 9.
Published in final edited form as: Amino Acids. 2009 Aug 14;38(5):1313–1322. doi: 10.1007/s00726-009-0338-4

Scheme 1.

Scheme 1

Biosynthetic approach for the production of cyclic peptide SFTI-1 inside living E. coli cells. Backbone cyclization of the linear precursor is mediated by a modified protein splicing unit or intein. The cyclized peptide then folds spontaneously in the bacterial cytoplasm (CBD stands for chitin binding domain).