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NOVENA SIGNED

Exploiting an unusual polyketide chain release mechanism for production of novel enacyloxin antibiotic analogues

Total Cost €

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EC-Contrib. €

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Partnership

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Project "NOVENA" data sheet

The following table provides information about the project.

Coordinator
THE UNIVERSITY OF WARWICK 

Organization address
address: Kirby Corner Road - University House
city: COVENTRY
postcode: CV4 8UW
website: www.warwick.ac.uk

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
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fax: n.a.

 Coordinator Country United Kingdom [UK]
 Project website http://www2.warwick.ac.uk/fac/sci/chemistry/research/challis/challisgroup
 Total cost 195˙454 €
 EC max contribution 195˙454 € (100%)
 Programme 1. H2020-EU.1.3.2. (Nurturing excellence by means of cross-border and cross-sector mobility)
 Code Call H2020-MSCA-IF-2014
 Funding Scheme MSCA-IF-EF-ST
 Starting year 2015
 Duration (year-month-day) from 2015-06-01   to  2017-05-31

 Partnership

Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 
1    THE UNIVERSITY OF WARWICK UK (COVENTRY) coordinator 195˙454.00

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 Project objective

Enacyloxin IIa is a polyketide antibiotic with activity against Gram-positive and Gram-negative bacteria that targets ribosomal elongation factor Tu. It has recently been identified as metabolite of Burkholderia ambifaria AMMD and shown to have clinically-relevant activity against Acinetobacter baumannii, a problematic pan-resistant Gram-negative pathogen. Despite its promising biological activity, enacyloxin IIa has not been used in the clinic, presumably due to stability issues. Preliminary experiments have provided evidence for an unusual mechanism of modular polyketide synthase chain release in enacyloxin biosynthesis, involving intermolecular condensation of an acyl carrier protein (ACP)-bound thioester with the C-3 hydroxyl group of (1R, 3R, 4S)-3,4-dihydroxycyclohexane carboxylic acid (DHCCA). The resulting intermediate undergoes epimerisation at C-1 of the DHCCA moiety. This project aims to explore the ability of the chain release enzyme to catalyse the acetylation of a variety of DHCCA analogues with an acetyl-ACP analogue of the polyketide thioester intermediate. It also aims to identify the enzyme responsible for epimerising C-1 of the DHCCA moiety. DHCCA biosynthetic genes will be deleted in B. ambifaria and enacyloxin analogues, with a stable amide group in place of the labile ester group and other modifications to the DHCCA-derived moiety, will be produced via a mutasynthesis strategy.

 Publications

year authors and title journal last update
List of publications.
2017 J. Masschelein, M. Jenner, G. L. Challis
Antibiotics from Gram-negative bacteria: a comprehensive overview and selected biosynthetic highlights
published pages: 712-783, ISSN: 0265-0568, DOI: 10.1039/C7NP00010C
Nat. Prod. Rep. 34/7 2019-06-13

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