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Improved production of class I lanthipeptides in
Lanthipeptides are ribosomally synthesised and post-translationally modified peptides containing lanthionine (Lan) and methyllanthionine (MeLan) residues that are formed by dehydration of Ser/Thr residues followed by conjugate addition of Cys to the resulting dehydroamino acids. Class I lanthipeptid...
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Published in: | Chemical science (Cambridge) 2023-03, Vol.14 (1), p.2537-2546 |
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Main Authors: | , , , , |
Format: | Article |
Language: | |
Online Access: | Get full text |
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Summary: | Lanthipeptides are ribosomally synthesised and post-translationally modified peptides containing lanthionine (Lan) and methyllanthionine (MeLan) residues that are formed by dehydration of Ser/Thr residues followed by conjugate addition of Cys to the resulting dehydroamino acids. Class I lanthipeptide dehydratases utilize glutamyl-tRNA
Glu
as a co-substrate to glutamylate Ser/Thr followed by glutamate elimination. Here we report a new system to heterologously express class I lanthipeptides in
Escherichia coli
through co-expression of the producing organism's glutamyl-tRNA synthetase (GluRS) and tRNA
Glu
pair in the vector pEVOL. In contrast to the results in the absence of the pEVOL system, we observed the production of fully-dehydrated peptides, including epilancin 15X, and peptides from the
Bacteroidota Chryseobacterium
and
Runella
. A second common obstacle to production of lanthipeptides in
E. coli
is the formation of glutathione adducts. LanC-like (LanCL) enzymes were previously reported to add glutathione to dehydroamino-acid-containing proteins in Eukarya. Herein, we demonstrate that the LanCL enzymes can remove GSH adducts from
C
-glutathionylated peptides with
dl
- or
ll
-lanthionine stereochemistry. These two advances will aid synthetic biology-driven genome mining efforts to discover new lanthipeptides.
Expression of Glu-tRNA and its synthetase from lanthipeptide encoding bacteria using pEVOL improves production in
E. coli
. Often-observed glutathionylation can be reversed using LanCL enzymes. |
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ISSN: | 2041-6520 2041-6539 |
DOI: | 10.1039/d2sc06597e |