Generation of thiocillin ring size variants by prepeptide gene replacement and in vivo processing by Bacillus cereus.
The thiocillins from Bacillus cereus ATCC 14579 are natural products from the broader class of thiazolyl peptides. Their biosynthesis proceeds via extensive post-translational modification of a ribosomally encoded precursor peptide. This post-translational tailoring involves a key step formal cycloaddition between two distal serine residues. In the wild-type structure, this cycloaddition forms a major macrocycle circumscribed by 26-atoms (shortest path). Results presented herein demonstrate the promiscuity of this last step by means of a set of "competition" experiments. Cyclization proceeds in many cases to provide altered ring sizes, giving access to several variant rings sizes that have not previously been observed in nature.
Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, Indiana 47907, USA.
Albert A
AA
Bowers
Michael G
MG
Acker
Travis S
TS
Young
Christopher T
CT
Walsh
D000900:Anti-Bacterial Agents / Q000737:chemistry; D001409:Bacillus cereus / Q000235:genetics; D003500:Cyclization; D014644:Genetic Variation; D015394:Molecular Structure; D010455:Peptides / Q000737:chemistry / Q000235:genetics*; D011499:Protein Processing, Post-Translational
D000900:Anti-Bacterial Agents; D010455:Peptides; C012574:thiocillin