Collins, Cassandra and Hurley, Rachel and Almutlagah, Nada and O'Keeffe, Grainne and Keane, Thomas M. and Fitzpatrick, David A. and Owens, Rebecca A. (2017) Proteomic Characterization of Armillaria mellea Reveals Oxidative Stress Response Mechanisms and Altered Secondary Metabolism Profiles. Microorganisms, 5 (3). p. 60. ISSN 2076-2607

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Abstract

Armillaria mellea is a major plant pathogen. Yet, the strategies the organism uses to infect susceptible species, degrade lignocellulose and other plant material and protect itself against plant defences and its own glycodegradative arsenal are largely unknown. Here, we use a combination of gel and MS-based proteomics to profile A. mellea under conditions of oxidative stress and changes in growth matrix. 2-DE and LC-MS/MS were used to investigate the response of A. mellea to H2O2 and menadione/FeCl3 exposure, respectively. Several proteins were detected with altered abundance in response to H2O2, but not menadione/FeCl3 (i.e., valosin-containing protein), indicating distinct responses to these different forms of oxidative stress. One protein, cobalamin-independent methionine synthase, demonstrated a common response in both conditions, which may be a marker for a more general stress response mechanism. Further changes to the A. mellea proteome were investigated using MS-based proteomics, which identified changes to putative secondary metabolism (SM) enzymes upon growth in agar compared to liquid cultures. Metabolomic analyses revealed distinct profiles, highlighting the effect of growth matrix on SM production. This establishes robust methods by which to utilize comparative proteomics to characterize this important phytopathogen.

Item Type:	Article
Additional Information:	© 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Keywords:	Armillaria mellea; basidiomycete proteomics; oxidative stress; fungal proteomics; methionine synthase; polyamines; secondary metabolism;
Academic Unit:	Faculty of Science and Engineering > Biology
Item ID:	10907
Identification Number:	https://doi.org/10.3390/microorganisms5030060
Depositing User:	Rebecca Owens
Date Deposited:	01 Jul 2019 16:40
Journal or Publication Title:	Microorganisms
Publisher:	MDPI
Refereed:	Yes
URI:	https://www.mdpi.com
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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