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  • American Society for Microbiology  (3)
  • 1
    Online Resource
    Online Resource
    Molecular Cloning and Transcriptional Regulation of the Aspergillus nidulans xlnD Gene Encoding a β-Xylosidase
    American Society for Microbiology ; 1998
    In:  Applied and Environmental Microbiology Vol. 64, No. 4 ( 1998-04), p. 1412-1419
    Details
    In: Applied and Environmental Microbiology, American Society for Microbiology, Vol. 64, No. 4 ( 1998-04), p. 1412-1419
    Abstract: The xlnD gene encoding the 85-kDa β-xylosidase was cloned from Aspergillus nidulans . The deduced primary structure of the protein exhibits considerable similarity to the primary structures of the Aspergillus niger and Trichoderma reesei β-xylosidases and some similarity to the primary structures of the class 3 β-glucosidases. xlnD is regulated at the transcriptional level; it is induced by xylan and d -xylose and is repressed by d -glucose. Glucose repression is mediated by the product of the creA gene. Although several binding sites for the pH regulatory protein PacC were found in the upstream regulatory region, it was not clear from a Northern analysis whether PacC is involved in transcriptional regulation of xlnD.
    Type of Medium: Online Resource
    ISSN: 0099-2240 , 1098-5336
    URL: Article
    DOI: 10.1128/AEM.64.4.1412-1419.1998
    RVK:
    WA 15000
    Language: English
    Publisher: American Society for Microbiology
    Publication Date: 1998
    detail.hit.zdb_id: 223011-2
    detail.hit.zdb_id: 1478346-0
    SSG: 12
    Location Call Number Limitation Availability
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  • 2
    Online Resource
    Online Resource
    The Transcriptional Activator XlnR Regulates Both Xylanolytic and Endoglucanase Gene Expression in Aspergillus niger
    American Society for Microbiology ; 1998
    In:  Applied and Environmental Microbiology Vol. 64, No. 10 ( 1998-10), p. 3615-3619
    Details
    In: Applied and Environmental Microbiology, American Society for Microbiology, Vol. 64, No. 10 ( 1998-10), p. 3615-3619
    Abstract: The expression of genes encoding enzymes involved in xylan degradation and two endoglucanases involved in cellulose degradation was studied at the mRNA level in the filamentous fungus Aspergillus niger . A strain with a loss-of-function mutation in the xlnR gene encoding the transcriptional activator XlnR and a strain with multiple copies of this gene were investigated in order to define which genes are controlled by XlnR. The data presented in this paper show that the transcriptional activator XlnR regulates the transcription of the xlnB , xlnC , and xlnD genes encoding the main xylanolytic enzymes (endoxylanases B and C and β-xylosidase, respectively). Also, the transcription of the genes encoding the accessory enzymes involved in xylan degradation, including α-glucuronidase A, acetylxylan esterase A, arabinoxylan arabinofuranohydrolase A, and feruloyl esterase A, was found to be controlled by XlnR. In addition, XlnR also activates transcription of two endoglucanase-encoding genes, eglA and eglB , indicating that transcriptional regulation by XlnR goes beyond the genes encoding xylanolytic enzymes and includes regulation of two endoglucanase-encoding genes.
    Type of Medium: Online Resource
    ISSN: 0099-2240 , 1098-5336
    URL: Article
    DOI: 10.1128/AEM.64.10.3615-3619.1998
    RVK:
    WA 15000
    Language: English
    Publisher: American Society for Microbiology
    Publication Date: 1998
    detail.hit.zdb_id: 223011-2
    detail.hit.zdb_id: 1478346-0
    SSG: 12
    Location Call Number Limitation Availability
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Spatial Differentiation in the Vegetative Mycelium of Aspergillus niger
    American Society for Microbiology ; 2007
    In:  Eukaryotic Cell Vol. 6, No. 12 ( 2007-12), p. 2311-2322
    Details
    In: Eukaryotic Cell, American Society for Microbiology, Vol. 6, No. 12 ( 2007-12), p. 2311-2322
    Abstract: Fungal mycelia are exposed to heterogenic substrates. The substrate in the central part of the colony has been (partly) degraded, whereas it is still unexplored at the periphery of the mycelium. We here assessed whether substrate heterogeneity is a main determinant of spatial gene expression in colonies of Aspergillus niger . This question was addressed by analyzing whole-genome gene expression in five concentric zones of 7-day-old maltose- and xylose-grown colonies. Expression profiles at the periphery and the center were clearly different. More than 25% of the active genes showed twofold differences in expression between the inner and outermost zones of the colony. Moreover, 9% of the genes were expressed in only one of the five concentric zones, showing that a considerable part of the genome is active in a restricted part of the colony only. Statistical analysis of expression profiles of colonies that had either been or not been transferred to fresh xylose-containing medium showed that differential expression in a colony is due to the heterogeneity of the medium (e.g., genes involved in secretion, genes encoding proteases, and genes involved in xylose metabolism) as well as to medium-independent mechanisms (e.g., genes involved in nitrate metabolism and genes involved in cell wall synthesis and modification). Thus, we conclude that the mycelia of 7-day-old colonies of A. niger are highly differentiated. This conclusion is also indicated by the fact that distinct zones of the colony grow and secrete proteins, even after transfer to fresh medium.
    Type of Medium: Online Resource
    ISSN: 1535-9778 , 1535-9786
    URL: Article
    DOI: 10.1128/EC.00244-07
    Language: English
    Publisher: American Society for Microbiology
    Publication Date: 2007
    detail.hit.zdb_id: 2071564-X
    SSG: 12
    Location Call Number Limitation Availability
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