Jenner, Matthew, Jian, Xinyun, Dashti, Yousef, Masschelein, Joleen, Hobson, Christian, Roberts, Douglas M., Jones, Cerith, Harris, Simon, Parkhill, Julian, Raja, Huzefa A., Oberlies, Nicholas H., Pearce, Cedric J., Mahenthiralingam, Eshwar and Challis, Gregory L. (2019) An unusual Burkholderia gladioli double chain-initiating nonribosomal peptide synthetase assembles ‘fungal’ icosalide antibiotics. Chemical Science, 10 (21). pp. 5489-5494. doi:10.1039/C8SC04897E ISSN 2041-6520.

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Abstract

Burkholderia is a multi-talented genus of Gram-negative bacteria, which in recent years has become increasingly recognised as a promising source of bioactive natural products. Metabolite profiling of Burkholderia gladioli BCC0238 showed that it produces the asymmetric lipopeptidiolide antibiotic icosalide A1, originally isolated from a fungus. Genome sequencing of several B. gladioli isolates identified a gene encoding a nonribosomal peptide synthase (NRPS) with an unsual architecture that was predicted to be responsible for icosalide biosynthesis. Inactivation of this gene in B. gladioli BCC0238 abolished icosalide production. PCR analysis and sequencing of total DNA from the orginal fungal icosalide A1 producer revealed it has a B. gladioli strain associated with it that harbours an NRPS with an identical arcitecture to that responsible for icosalide A1 assembly in B. gladioli BCC0238. Sequence analysis of the icosalide NRPS indicated that it contains two chain-initiating condensation (CI) domains. One of these is appended to the N-terminus of module 1 – a common archictecture for NRPSs involved in lipopeptide assembly. The other is embedded in module 3, immediately downstream of a putative chain-elongating condensation domain. Analysis of the reactions catalysed by a tridomain construct from module 3 of the NRPS using intact protein mass spectometry showed that the embedded CI domain initiates assembly of a second lipopetide chain, providing key insights into the mechanism for asymmetric diolide assembly.

Item Type:	Journal Article
Divisions:	Faculty of Science, Engineering and Medicine > Science > Chemistry
Journal or Publication Title:	Chemical Science
Publisher:	Royal Society of Chemistry
ISSN:	2041-6520
Official Date:	7 June 2019
Dates:	Date Event 7 June 2019 Published 25 April 2019 Available 22 April 2019 Accepted
Volume:	10
Number:	21
Page Range:	pp. 5489-5494
DOI:	10.1039/C8SC04897E
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access (Creative Commons)
Date of first compliant deposit:	23 April 2019
Date of first compliant Open Access:	8 May 2019
Related URLs:	Publisher

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