Print Email Facebook Twitter Aspergillus niger genome-wide analysis reveals a large number of novel alpha-glucan acting enzymes with unexpected expression profiles Title Aspergillus niger genome-wide analysis reveals a large number of novel alpha-glucan acting enzymes with unexpected expression profiles Author Yuan, X.-L. van der Kaaij, R.M. van den Hondel, C.A.M.J.J. Punt, P.J. van der Maarel, M.J.E.C. Dijkhuizen, L. Ram, A.F.J. TNO Kwaliteit van Leven Publication year 2008 Abstract The filamentous ascomycete Aspergillus niger is well known for its ability to produce a large variety of enzymes for the degradation of plant polysaccharide material. A major carbon and energy source for this soil fungus is starch, which can be degraded by the concerted action of α-amylase, glucoamylase and α-glucosidase enzymes, members of the glycoside hydrolase (GH) families 13, 15 and 31, respectively. In this study we have combined analysis of the genome sequence of A. niger CBS 513.88 with microarray experiments to identify novel enzymes from these families and to predict their physiological functions. We have identified 17 previously unknown family GH13, 15 and 31 enzymes in the A. niger genome, all of which have orthologues in other aspergilli. Only two of the newly identified enzymes, a putative α-glucosidase (AgdB) and an α-amylase (AmyC), were predicted to play a role in starch degradation. The expression of the majority of the genes identified was not induced by maltose as carbon source, and not dependent on the presence of AmyR, the transcriptional regulator for starch degrading enzymes. The possible physiological functions of the other predicted family GH13, GH15 and GH31 enzymes, including intracellular enzymes and cell wall associated proteins, in alternative α-glucan modifying processes are discussed. © 2008 The Author(s). Subject BiologyAlpha-amylaseAlpha-glucanAlpha-glucosidaseAmyRAspergillus nigerCell wallGlucoamylaseMaltoseStarchStarch-binding domain1,4 alpha glucan branching enzymealpha glucosidaseamylasecell enzymecell membrane proteinfungal proteinglucan 1,4 alpha glucosidaseglycosidaseglycosylphosphatidylinositolmaltoseprotein amyrstarcharticleAspergillus nigercarbohydrate metabolismcarbon sourcecontrolled studydegradationenergy resourceenzymatic degradationenzyme synthesisgene expression profilinggene identificationgene sequencegenetic transcriptiongenome analysismicroarray analysisnonhumannucleotide sequencepriority journaltranscription regulationalpha-Amylasealpha-GlucosidasesAmino Acid SequenceAspergillus nigerBase SequenceConserved SequenceFungal ProteinsGene Expression ProfilingGene Expression Regulation, FungalGenome, FungalGenomicsGlucan 1,4-alpha-GlucosidaseGlycoside HydrolasesMaltoseMolecular Sequence DataPhylogenyTrans-ActivatorsTranscription, GeneticAspergillus nigerFungi To reference this document use: http://resolver.tudelft.nl/uuid:4163134c-c9d4-4a8c-a30f-cf1852003e3e DOI https://doi.org/10.1007/s00438-008-0332-7 TNO identifier 240837 ISSN 1617-4615 Source Molecular Genetics and Genomics, 279 (6), 545-561 Document type article Files To receive the publication files, please send an e-mail request to TNO Library.