uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
Genome and physiology of the ascomycete filamentous fungus Xeromyces bisporus, the most xerophilic organism isolated to date
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Biochemistry and Microbiology.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Immunology, Genetics and Pathology.
Show others and affiliations
2015 (English)In: Environmental Microbiology, ISSN 1462-2912, E-ISSN 1462-2920, Vol. 17, no 2, 496-513 p.Article in journal (Refereed) Published
Abstract [en]

Xeromyces bisporus can grow on sugary substrates down to 0.61, an extremely low water activity. Its genome size is approximately 22Mb. Gene clusters encoding for secondary metabolites were conspicuously absent; secondary metabolites were not detected experimentally. Thus, in its dry' but nutrient-rich environment, X.bisporus appears to have relinquished abilities for combative interactions. Elements to sense/signal osmotic stress, e.g. HogA pathway, were present in X.bisporus. However, transcriptomes at optimal (approximate to 0.89) versus low a(w) (0.68) revealed differential expression of only a few stress-related genes; among these, certain (not all) steps for glycerol synthesis were upregulated. Xeromyces bisporus increased glycerol production during hypo- and hyper-osmotic stress, and much of its wet weight comprised water and rinsable solutes; leaked solutes may form a protective slime. Xeromyces bisporus and other food-borne moulds increased membrane fatty acid saturation as water activity decreased. Such modifications did not appear to be transcriptionally regulated in X.bisporus; however, genes modulating sterols, phospholipids and the cell wall were differentially expressed. Xeromyces bisporus was previously proposed to be a chaophile', preferring solutes that disorder biomolecular structures. Both X.bisporus and the closely related xerophile, Xerochrysium xerophilum, with low membrane unsaturation indices, could represent a phylogenetic cluster of chaophiles'.

Place, publisher, year, edition, pages
2015. Vol. 17, no 2, 496-513 p.
National Category
Microbiology in the medical area
URN: urn:nbn:se:uu:diva-249021DOI: 10.1111/1462-2920.12596ISI: 000350546200016PubMedID: 25142400OAI: oai:DiVA.org:uu-249021DiVA: diva2:807785
Available from: 2015-04-24 Created: 2015-04-10 Last updated: 2015-04-24Bibliographically approved

Open Access in DiVA

fulltext(900 kB)80 downloads
File information
File name FULLTEXT01.pdfFile size 900 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Other links

Publisher's full textPubMed

Search in DiVA

By author/editor
Lantz, HenrikPettersson, Olga VinnereGrabherr, ManfredTellgren-Roth, Christian
By organisation
Department of Medical Biochemistry and MicrobiologyDepartment of Immunology, Genetics and PathologyScience for Life Laboratory, SciLifeLab
In the same journal
Environmental Microbiology
Microbiology in the medical area

Search outside of DiVA

GoogleGoogle Scholar
Total: 80 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 331 hits
ReferencesLink to record
Permanent link

Direct link