Phosphopantetheinyl transferase (Ppt)-mediated biosynthesis of lysine, but not siderophore or DHN melanin, is required for virulence of Zymoseptoria tritici on wheat

A - Papers appearing in refereed journals

Derbyshire, M. C., Gohari, A. M., Mehrabi, R., Kilaru, S., Steinberg, G., Ali, S., Bailey, A., Hammond-Kosack, K. E., Kema, G. H. J. and Rudd, J. J. 2018. Phosphopantetheinyl transferase (Ppt)-mediated biosynthesis of lysine, but not siderophore or DHN melanin, is required for virulence of Zymoseptoria tritici on wheat. Scientific Reports. 8 (17069). https://doi.org/10.1038/s41598-018-35223-8

AuthorsDerbyshire, M. C., Gohari, A. M., Mehrabi, R., Kilaru, S., Steinberg, G., Ali, S., Bailey, A., Hammond-Kosack, K. E., Kema, G. H. J. and Rudd, J. J.
Abstract

Zymoseptoria tritici is the causal agent of Septoria tritici blotch (STB) disease of wheat. Z. tritici is an apoplastic fungal leaf pathogen which does not penetrate plant cells at any stage of infection and has a long initial period of symptomless colonisation. During this phase, it is unclear to what extent the fungus can access host plant nutrients or communicate with plant cells. Several important primary and secondary metabolite pathways in fungi are regulated by the post-translational activator phosphopantetheinyl transferase (Ppt) which provides an essential co-factor for lysine biosynthesis and the activities of non-ribosomal peptide synthases (NRPS) and polyketide synthases (PKS). To investigate the relative importance of lysine biosynthesis, NRPS-based siderophore production, and PKS-based DHN melanin biosynthesis, we generated deletion mutants of ZtPpt. The ∆ZtPpt strains were auxotrophic for lysine and iron, non-melanised and non-pathogenic on wheat. Deletion of the three target genes likely affected by ZtPpt loss of function (Aar- lysine; Nrps1-siderophore and Pks1-melanin), highlighted that lysine auxotrophy was the main contributing factor for loss of virulence, with no reduction caused by loss of siderophore production or melanisation. This reveals Ppt, and the lysine biosynthesis pathway, as potential targets for fungicides effective against Z. tritici.

KeywordsDothideomycete; Secondary metabolism; StuA; Transcriptional regulation; Phosphopantetheinyl transferase; Melanisation; Mycosphaerella graminicola; Dimorphic fungi; Fungicide resistance; Host-specific toxin
Year of Publication2018
JournalScientific Reports
Journal citation8 (17069)
Digital Object Identifier (DOI)https://doi.org/10.1038/s41598-018-35223-8
PubMed ID30459352
Open accessPublished as ‘gold’ (paid) open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeDesigning Future Wheat (DFW) [ISPG]
DFW - Designing Future Wheat - Work package 2 (WP2) - Added value and resilience
BB/N01597/1
Publisher's version
Accepted author manuscript
Output statusPublished
Publication dates
Online20 Nov 2018
Publication process dates
Accepted30 Oct 2018
PublisherNature Publishing Group
Copyright licenseCC BY
ISSN2045-2322

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