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Analysis of the Phlebiopsis gigantea genome, transcriptome and secretome provides insight into its pioneer colonization strategies of wood.

Hori C, Ishida T, Igarashi K, Samejima M, Suzuki H, Master E, Ferreira P, Ruiz-Dueñas FJ, Held B, Canessa P, Larrondo LF, Schmoll M, Druzhinina IS, Kubicek CP, Gaskell JA, Kersten P, St John F, Glasner J, Sabat G, Splinter BonDurant S, Syed K, Yadav J, Mgbeahuruike AC, Kovalchuk A, Asiegbu FO, Lackner G, Hoffmeister D, Rencoret J, Gutiérrez A, Sun H, Lindquist E, Barry K, Riley R, Grigoriev IV, Henrissat B, Kües U, Berka RM, Martínez AT, Covert SF, Blanchette RA, Cullen D - PLoS Genet. (2014)

Bottom Line: Their products included an ABC transporter, lipases, cytochrome P450s, glutathione S-transferase and aldehyde dehydrogenase.Other regulated genes of unknown function and several constitutively expressed genes are also likely involved in P. gigantea's extractives metabolism.These results contribute to our fundamental understanding of pioneer colonization of conifer wood and provide insight into the diverse chemistries employed by fungi in carbon cycling processes.

View Article: PubMed Central - PubMed

Affiliation: Department of Biomaterials Sciences, University of Tokyo, Tokyo, Japan.

ABSTRACT
Collectively classified as white-rot fungi, certain basidiomycetes efficiently degrade the major structural polymers of wood cell walls. A small subset of these Agaricomycetes, exemplified by Phlebiopsis gigantea, is capable of colonizing freshly exposed conifer sapwood despite its high content of extractives, which retards the establishment of other fungal species. The mechanism(s) by which P. gigantea tolerates and metabolizes resinous compounds have not been explored. Here, we report the annotated P. gigantea genome and compare profiles of its transcriptome and secretome when cultured on fresh-cut versus solvent-extracted loblolly pine wood. The P. gigantea genome contains a conventional repertoire of hydrolase genes involved in cellulose/hemicellulose degradation, whose patterns of expression were relatively unperturbed by the absence of extractives. The expression of genes typically ascribed to lignin degradation was also largely unaffected. In contrast, genes likely involved in the transformation and detoxification of wood extractives were highly induced in its presence. Their products included an ABC transporter, lipases, cytochrome P450s, glutathione S-transferase and aldehyde dehydrogenase. Other regulated genes of unknown function and several constitutively expressed genes are also likely involved in P. gigantea's extractives metabolism. These results contribute to our fundamental understanding of pioneer colonization of conifer wood and provide insight into the diverse chemistries employed by fungi in carbon cycling processes.

No MeSH data available.


Related in: MedlinePlus

Number and expression of genes likely involved in lignocellulose degradation.The number of genes encoding mass spectrometry-identified proteins was limited to those matching≥2 unique peptides after 5–9 days growth in media containing NELP or ELP. RPKM values>100 for RNA derived from these cultures were arbitrarily selected as the threshold for high transcript levels. Genes designated as ‘regulated’ showed significant accumulation (p<0.05;>2-fold) in NELP or ELP relative to glucose containing media. Methods and complete data are presented in Text S1 and Dataset S2.
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pgen-1004759-g006: Number and expression of genes likely involved in lignocellulose degradation.The number of genes encoding mass spectrometry-identified proteins was limited to those matching≥2 unique peptides after 5–9 days growth in media containing NELP or ELP. RPKM values>100 for RNA derived from these cultures were arbitrarily selected as the threshold for high transcript levels. Genes designated as ‘regulated’ showed significant accumulation (p<0.05;>2-fold) in NELP or ELP relative to glucose containing media. Methods and complete data are presented in Text S1 and Dataset S2.

Mentions: Glycoside hydrolase gene expression was heavily influenced by media composition with transcripts corresponding to 76 genes increasing>2-fold in NELP- or ELP-containing media relative to glucose medium (Figure 6). Some of these genes were highly expressed with RPKM values well over 100. For example, transcript and peptide levels matching GH7 cellobiohydrolase (CBH1; model Phlgi1_34136) were among the ten most highly expressed genes (Table 1). Indicative of a complete cellulolytic system, this CBH1 was accompanied by upregulated transcripts and extracellular proteins corresponding to another CBH1 (Phlgi1_13298), a GH6 family member CBH2 (Phlgi1_17701) and GH5_5 β-1,4 endoglucanases (EGs; Phlgi1_86144, Phlgi1_84111), all of which feature a family 1 carbohydrate binding module (CBM1). Also highly expressed were putative β-glucosidases (Phlgi1_127564, Phlgi1_18210) and a GH12 (Phlgi1_34479). Other glycoside hydrolases likely involved in degradation of cell wall hemicelluloses include GH5_7 endomannanases (Phlgi1_97727, Phlgi1_110296), a GH74 xyloglucanase (Phlgi1_98770), a GH27 α-galactosidase (Phlgi1_72848) and a GH10 endoxylanase (Phlgi1_85016).


Analysis of the Phlebiopsis gigantea genome, transcriptome and secretome provides insight into its pioneer colonization strategies of wood.

Hori C, Ishida T, Igarashi K, Samejima M, Suzuki H, Master E, Ferreira P, Ruiz-Dueñas FJ, Held B, Canessa P, Larrondo LF, Schmoll M, Druzhinina IS, Kubicek CP, Gaskell JA, Kersten P, St John F, Glasner J, Sabat G, Splinter BonDurant S, Syed K, Yadav J, Mgbeahuruike AC, Kovalchuk A, Asiegbu FO, Lackner G, Hoffmeister D, Rencoret J, Gutiérrez A, Sun H, Lindquist E, Barry K, Riley R, Grigoriev IV, Henrissat B, Kües U, Berka RM, Martínez AT, Covert SF, Blanchette RA, Cullen D - PLoS Genet. (2014)

Number and expression of genes likely involved in lignocellulose degradation.The number of genes encoding mass spectrometry-identified proteins was limited to those matching≥2 unique peptides after 5–9 days growth in media containing NELP or ELP. RPKM values>100 for RNA derived from these cultures were arbitrarily selected as the threshold for high transcript levels. Genes designated as ‘regulated’ showed significant accumulation (p<0.05;>2-fold) in NELP or ELP relative to glucose containing media. Methods and complete data are presented in Text S1 and Dataset S2.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4256170&req=5

pgen-1004759-g006: Number and expression of genes likely involved in lignocellulose degradation.The number of genes encoding mass spectrometry-identified proteins was limited to those matching≥2 unique peptides after 5–9 days growth in media containing NELP or ELP. RPKM values>100 for RNA derived from these cultures were arbitrarily selected as the threshold for high transcript levels. Genes designated as ‘regulated’ showed significant accumulation (p<0.05;>2-fold) in NELP or ELP relative to glucose containing media. Methods and complete data are presented in Text S1 and Dataset S2.
Mentions: Glycoside hydrolase gene expression was heavily influenced by media composition with transcripts corresponding to 76 genes increasing>2-fold in NELP- or ELP-containing media relative to glucose medium (Figure 6). Some of these genes were highly expressed with RPKM values well over 100. For example, transcript and peptide levels matching GH7 cellobiohydrolase (CBH1; model Phlgi1_34136) were among the ten most highly expressed genes (Table 1). Indicative of a complete cellulolytic system, this CBH1 was accompanied by upregulated transcripts and extracellular proteins corresponding to another CBH1 (Phlgi1_13298), a GH6 family member CBH2 (Phlgi1_17701) and GH5_5 β-1,4 endoglucanases (EGs; Phlgi1_86144, Phlgi1_84111), all of which feature a family 1 carbohydrate binding module (CBM1). Also highly expressed were putative β-glucosidases (Phlgi1_127564, Phlgi1_18210) and a GH12 (Phlgi1_34479). Other glycoside hydrolases likely involved in degradation of cell wall hemicelluloses include GH5_7 endomannanases (Phlgi1_97727, Phlgi1_110296), a GH74 xyloglucanase (Phlgi1_98770), a GH27 α-galactosidase (Phlgi1_72848) and a GH10 endoxylanase (Phlgi1_85016).

Bottom Line: Their products included an ABC transporter, lipases, cytochrome P450s, glutathione S-transferase and aldehyde dehydrogenase.Other regulated genes of unknown function and several constitutively expressed genes are also likely involved in P. gigantea's extractives metabolism.These results contribute to our fundamental understanding of pioneer colonization of conifer wood and provide insight into the diverse chemistries employed by fungi in carbon cycling processes.

View Article: PubMed Central - PubMed

Affiliation: Department of Biomaterials Sciences, University of Tokyo, Tokyo, Japan.

ABSTRACT
Collectively classified as white-rot fungi, certain basidiomycetes efficiently degrade the major structural polymers of wood cell walls. A small subset of these Agaricomycetes, exemplified by Phlebiopsis gigantea, is capable of colonizing freshly exposed conifer sapwood despite its high content of extractives, which retards the establishment of other fungal species. The mechanism(s) by which P. gigantea tolerates and metabolizes resinous compounds have not been explored. Here, we report the annotated P. gigantea genome and compare profiles of its transcriptome and secretome when cultured on fresh-cut versus solvent-extracted loblolly pine wood. The P. gigantea genome contains a conventional repertoire of hydrolase genes involved in cellulose/hemicellulose degradation, whose patterns of expression were relatively unperturbed by the absence of extractives. The expression of genes typically ascribed to lignin degradation was also largely unaffected. In contrast, genes likely involved in the transformation and detoxification of wood extractives were highly induced in its presence. Their products included an ABC transporter, lipases, cytochrome P450s, glutathione S-transferase and aldehyde dehydrogenase. Other regulated genes of unknown function and several constitutively expressed genes are also likely involved in P. gigantea's extractives metabolism. These results contribute to our fundamental understanding of pioneer colonization of conifer wood and provide insight into the diverse chemistries employed by fungi in carbon cycling processes.

No MeSH data available.


Related in: MedlinePlus