Genomic and secretomic insight into lignocellulolytic system of an endophytic bacterium Pantoea ananatis Sd-1

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dc.contributor.authorMa, Jiangshanen_ZA
dc.contributor.authorZhang, Kekeen_ZA
dc.contributor.authorLiao, Hongdongen_ZA
dc.contributor.authorHector, Stanton B.en_ZA
dc.contributor.authorShi, Xiaoweien_ZA
dc.contributor.authorLi, Jianglinen_ZA
dc.contributor.authorLiu, Binen_ZA
dc.contributor.authorXu, Tingen_ZA
dc.contributor.authorTong, Chunyien_ZA
dc.contributor.authorLiu, Xuanmingen_ZA
dc.contributor.authorZhu, Yonghuaen_ZA
dc.date.accessioned2017-01-24T10:55:02Z
dc.date.available2017-01-24T10:55:02Z
dc.date.issued2016
dc.date.updated2016-12-09T12:08:34Z
dc.descriptionCITATION: Ma, J., et al. 2016. Genomic and secretomic insight into lignocellulolytic system of an endophytic bacterium Pantoea ananatis Sd-1. Biotechnol Biofuels, 9:25, doi:10.1186/s13068-016-0439-8.en_ZA
dc.descriptionThe original publication is available at http://biotechnologyforbiofuels.biomedcentral.comen_ZA
dc.description.abstractBackground: Exploring microorganisms especially bacteria associated with the degradation of lignocellulosic biomass shows great potentials in biofuels production. The rice endophytic bacterium Pantoea ananatis Sd-1 with strong lignocellulose degradation capacity has been reported in our previous study. However, a comprehensive analysis of its corresponding degradative system has not yet been conducted. The aim of this work is to identify and characterize the lignocellulolytic enzymes of the bacterium to understand its mechanism of lignocellulose degradation and facilitate its application in sustainable energy production. Results: The genomic analysis revealed that there are 154 genes encoding putative carbohydrate-active enzymes (CAZy) in P. ananatis Sd-1. This number is higher than that of compared cellulolytic and ligninolytic bacteria as well as other eight P. ananatis strains. The CAZy in P. ananatis Sd-1 contains a complete repertoire of enzymes required for cellulose and hemicellulose degradation. In addition, P. ananatis Sd-1 also possesses plenty of genes encoding potential ligninolytic relevant enzymes, such as multicopper oxidase, catalase/hydroperoxidase, glutathione S-transferase, and quinone oxidoreductase. Quantitative real-time PCR analysis of parts of genes encoding lignocellulolytic enzymes revealed that they were significantly up-regulated (at least P < 0.05) in presence of rice straw. Further identification of secretome of P. ananatis Sd-1 by nano liquid chromatography–tandem mass spectrometry confirmed that considerable amounts of proteins involved in lignocellulose degradation were only detected in rice straw cultures. Rice straw saccharification levels by the secretome of P. ananatis Sd-1 reached 129.11 ± 2.7 mg/gds. Correspondingly, the assay of several lignocellulolytic enzymes including endoglucanase, exoglucanase, β-glucosidase, xylanase-like, lignin peroxidase-like, and laccase-like activities showed that these enzymes were more active in rice straw relative to glucose substrates. The high enzymes activities were not attributed to bacterial cell densities but to the difference of secreted protein contents. Conclusion: Our results indicate that P. ananatis Sd-1 can produce considerable lignocellulolytic enzymes including cellulases, hemicellulases, and ligninolytic relevant enzymes. The high activities of those enzymes could be efficiently induced by lignocellulosic biomass. This identified degradative system is valuable for the lignocellulosic bioenergy industry.en_ZA
dc.description.urihttp://biotechnologyforbiofuels.biomedcentral.com/articles/10.1186/s13068-016-0439-8en_ZA
dc.description.versionPublisher's versionen_ZA
dc.format.extent15 pages : illustrationsen_ZA
dc.identifier.citationMa, J., et al. 2016. Genomic and secretomic insight into lignocellulolytic system of an endophytic bacterium Pantoea ananatis Sd-1. Biotechnol Biofuels, 9:25, doi:10.1186/s13068-016-0439-8en_ZA
dc.identifier.issn1754-6834 (Online)
dc.identifier.otherdoi:10.1186/s13068-016-0439-8
dc.identifier.urihttp://hdl.handle.net/10019.1/100510
dc.language.isoen_ZAen_ZA
dc.publisherBioMed Centralen_ZA
dc.rights.holderAuthor retains copyrighten_ZA
dc.subjectEndophytic bacteriumen_ZA
dc.subjectPantoea ananatisen_ZA
dc.subjectLignocellulolytic system enzyme -- Characterisationen_ZA
dc.titleGenomic and secretomic insight into lignocellulolytic system of an endophytic bacterium Pantoea ananatis Sd-1en_ZA
dc.typeArticleen_ZA
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