Coregulation of the cyclic lipopeptides orfamide and sessilin in the biocontrol strain Pseudomonas sp. CMR12a

[en] Cyclic lipopeptides (CLPs) are synthesized by nonribosomal peptide synthetases (NRPS), which are often flanked by LuxR-type transcriptional regulators. Pseudomonas sp. CMR12a, an effective biocontrol strain, produces two different classes of CLPs namely sessilins and orfamides. The orfamide biosynthesis gene cluster is flanked up- and downstream by LuxR-type regulatory genes designated ofaR1 and ofaR2, respectively, whereas the sessilin biosynthesis gene cluster has one LuxR-type regulatory gene which is situated upstream of the cluster and is designated sesR. Our study investigated the role of these three regulators in the biosynthesis of orfamides and sessilins. Phylogenetic analyses positioned OfaR1 and OfaR2 with LuxR regulatory proteins of similar orfamide-producing Pseudomonas strains and the SesR with that of the tolaasin producer, Pseudomonas tolaasii. LC-ESI-MS analyses revealed that sessilins and orfamides are coproduced and that production starts in the late exponential phase. However, sessilins are secreted earlier and in large amounts, while orfamides are predominantly retained in the cell. Deletion mutants in ofaR1 and ofaR2 lost the capacity to produce both orfamides and sessilins, whereas the sesR mutant showed no clear phenotype. Additionally, RT-PCR analysis showed that in the sessilin cluster, a mutation in either ofaR1 or ofaR2 led to weaker transcripts of the biosynthesis genes, sesABC, and putative transporter genes, macA1B1. In the orfamide cluster, mainly the biosynthesis genes ofaBC were affected, while the first biosynthesis gene ofaA and putative macA2B2 transport genes were still transcribed. A mutation in either ofaR1, ofaR2, or sesR genes did not abolish the transcription of any of the other two. © 2017 The Authors. MicrobiologyOpen published by John Wiley & Sons Ltd.

Disciplines :

Microbiology

Author, co-author :

Olorunleke, F. E.; Laboratory of Phytopathology, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium

Kieu, N. P.; Laboratory of Phytopathology, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium

De Waele, E.; Laboratory of Phytopathology, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium

Timmerman, M.; Laboratory of Phytopathology, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium

Ongena, Marc ; Université de Liège - ULiège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Microbial, food and biobased technologies

Höfte, M.; Laboratory of Phytopathology, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium

Language :

English

Title :

Coregulation of the cyclic lipopeptides orfamide and sessilin in the biocontrol strain Pseudomonas sp. CMR12a

Publication date :

2017

Journal title :

MicrobiologyOpen

eISSN :

2045-8827

Publisher :

Blackwell Publishing Ltd

Volume :

Issue :

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 05 February 2018

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