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Antioxidants (Basel)

Title:		Actin Cytoskeleton Regulation by the Yeast NADPH Oxidase Yno1p Impacts Processes Controlled by MAPK Pathways
Author(s):		Weber M; Basu S; Gonzalez B; Greslehner GP; Singer S; Haskova D; Hasek J; Breitenbach M; Gourlay W; Cullen PJ; Rinnerthaler M;
Address:		"Department of Biosciences, University of Salzburg, 5020 Salzburg, Austria. Department of Biological Sciences, State University of New York at Buffalo, Buffalo, NY 14260-1300, USA. Laboratory of Cell Reproduction, Institute of Microbiology of the Czech Academy of Sciences, Videnska 1083, 142 20 Prague 4, Czech Republic. Kent Fungal Group, School of Biosciences, University of Kent, Kent CT2 9HY, UK"
Journal Title:		Antioxidants (Basel)
Year:		2021
Volume:		20210222
Issue:		2
Page Number:		-
DOI:		10.3390/antiox10020322
ISSN/ISBN:		2076-3921 (Print) 2076-3921 (Electronic) 2076-3921 (Linking)
Abstract:		"Reactive oxygen species (ROS) that exceed the antioxidative capacity of the cell can be harmful and are termed oxidative stress. Increasing evidence suggests that ROS are not exclusively detrimental, but can fulfill important signaling functions. Recently, we have been able to demonstrate that a NADPH oxidase-like enzyme (termed Yno1p) exists in the single-celled organism Saccharomyces cerevisiae. This enzyme resides in the peripheral and perinuclear endoplasmic reticulum and functions in close proximity to the plasma membrane. Its product, hydrogen peroxide, which is also produced by the action of the superoxide dismutase, Sod1p, influences signaling of key regulatory proteins Ras2p and Yck1p/2p. In the present work, we demonstrate that Yno1p-derived H(2)O(2) regulates outputs controlled by three MAP kinase pathways that can share components: the filamentous growth (filamentous growth MAPK (fMAPK)), pheromone response, and osmotic stress response (hyperosmolarity glycerol response, HOG) pathways. A key structural component and regulator in this process is the actin cytoskeleton. The nucleation and stabilization of actin are regulated by Yno1p. Cells lacking YNO1 showed reduced invasive growth, which could be reversed by stimulation of actin nucleation. Additionally, under osmotic stress, the vacuoles of a ?Osyno1 strain show an enhanced fragmentation. During pheromone response induced by the addition of alpha-factor, Yno1p is responsible for a burst of ROS. Collectively, these results broaden the roles of ROS to encompass microbial differentiation responses and stress responses controlled by MAPK pathways"
Keywords:		MAP kinase pathway Ros actin apoptosis filamentous growth invasive growth osmotic stress pheromone response pseudohyphal growth;
Notes:		"PubMed-not-MEDLINEWeber, Manuela Basu, Sukanya Gonzalez, Beatriz Greslehner, Gregor P Singer, Stefanie Haskova, Danusa Hasek, Jiri Breitenbach, Michael W Gourlay, Campbell Cullen, Paul J Rinnerthaler, Mark eng R01 GM098629/GM/NIGMS NIH HHS/ P33511/Austrian Science Fund/ GM098629/NIH Clinical Center/ P26713/Austrian Science Fund/ Switzerland 2021/03/07 Antioxidants (Basel). 2021 Feb 22; 10(2):322. doi: 10.3390/antiox10020322"