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Sensing and responding to hypersaline conditions and the HOG signal transduction pathway in fungi isolated from hypersaline environments [Elektronski vir] : Hortaea werneckii and Wallemia ichthyophagaPlemenitaš, Ana, 1952-Sensing and responding to changes in NaCl concentration in hypersaline environments is vital for cell survival. In this paper, we identified and characterized key components of the high-osmolarity ... glycerol (HOG) signal transduction pathway, which is crucial in sensing hypersaline conditions in the extremely halotolerant black yeast Hortaea werneckii and in the obligate halophilic fungus Wallemia ichthyophaga. Both organisms were isolated from solar salterns, their predominating ecological niche. The identified components included homologous proteins of both branches involved in sensing high osmolarity (SHO1 and SLN1) and the homologues of mitogen-activated protein kinase module (MAPKKK Ste11, MAPKK Pbs2, and MAPK Hog1). Functional complementation of the identified gene products in S. cerevisiae mutant strains revealed some of their functions. Structural protein analysis demonstrated important structural differences in the HOG pathway components between halotolerant/halophilic fungi isolated from solar salterns, salt-sensitive S. cerevisiae, the extremely salt-tolerant H. werneckii, and halophilic W. ichthyophaga. Known and novel gene targets of MAP kinase Hog1 were uncovered particularly in halotolerant H. werneckii. Molecular studies of many salt-responsive proteins confirm unique and novel mechanisms of adaptation to changes in salt concentration.Source: Journal of fungi [Elektronski vir]. - ISSN 2309-608X (Vol. 7, iss. 11, 2021, str. 1-13)Type of material - e-article ; adult, seriousPublish date - 2021Language - englishCOBISS.SI-ID - 86840579
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Plemenitaš, Ana, 1952- | 06777 |
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