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Open AccessArticle

Fungal Adaptation to the Advanced Stages of Wood Decomposition: Insights from the Steccherinum ochraceum

1
A. N. Bach Institute of Biochemistry, Research Center of Biotechnology, Russian Academy of Sciences, Leninsky Ave. 33/2, Moscow 119071, Russia
2
Komarov Botanical Institute of the Russian Academy of Sciences, Professor Popov St. 2, St. Petersburg 197376, Russia
3
N. I. Vavilov Institute of General Genetics, Russian Academy of Sciences, Moscow 119071, Russia
*
Authors to whom correspondence should be addressed.
Microorganisms 2019, 7(11), 527; https://doi.org/10.3390/microorganisms7110527
Received: 23 October 2019 / Revised: 29 October 2019 / Accepted: 31 October 2019 / Published: 5 November 2019
(This article belongs to the Special Issue Ecology and Genomics of Forest Fungi and Their Interactions)
Steccherinum ochraceum is a white rot basidiomycete with wide ecological amplitude. It occurs in different regions of Russia and throughout the world, occupying different climatic zones. S. ochraceum colonizes stumps, trunks, and branches of various deciduous (seldom coniferous) trees. As a secondary colonizing fungus, S. ochraceum is mainly observed at the late decay stages. Here, we present the de novo assembly and annotation of the genome of S. ochraceum, LE-BIN 3174. This is the 8th published genome of fungus from the residual polyporoid clade and the first from the Steccherinaceae family. The obtained genome provides a first glimpse into the genetic and enzymatic mechanisms governing adaptation of S. ochraceum to an ecological niche of pre-degraded wood. It is proposed that increased number of carbohydrate-active enzymes (CAZymes) belonging to the AA superfamily and decreased number of CAZymes belonging to the GH superfamily reflects substrate preferences of S. ochraceum. This proposition is further substantiated by the results of the biochemical plate tests and exoproteomic study, which demonstrates that S. ochraceum assumes the intermediate position between typical primary colonizing fungi and litter decomposers or humus saprotrophs. Phylogenetic analysis of S. ochraceum laccase and class II peroxidase genes revealed the distinct evolutional origin of these genes in the Steccherinaceae family. View Full-Text
Keywords: Steccherinum ochraceum; genome; wood decay; CAZymes; laccases; class II peroxidases; phylogeny; evolution; exoproteome Steccherinum ochraceum; genome; wood decay; CAZymes; laccases; class II peroxidases; phylogeny; evolution; exoproteome
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Moiseenko, K.V.; Glazunova, O.A.; Shakhova, N.V.; Savinova, O.S.; Vasina, D.V.; Tyazhelova, T.V.; Psurtseva, N.V.; Fedorova, T.V. Fungal Adaptation to the Advanced Stages of Wood Decomposition: Insights from the Steccherinum ochraceum. Microorganisms 2019, 7, 527.

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