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Applied and Environmental Microbiology
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Genetics and Molecular Biology

The Transcriptional Activator XlnR Regulates Both Xylanolytic and Endoglucanase Gene Expression inAspergillus niger

Noël N. M. E. van Peij, Marco M. C. Gielkens, Ronald P. de Vries, Jaap Visser, Leo H. de Graaff
Noël N. M. E. van Peij
Section Molecular Genetics of Industrial Microorganisms, Wageningen Agricultural University, NL-6703 HA Wageningen, The Netherlands
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Marco M. C. Gielkens
Section Molecular Genetics of Industrial Microorganisms, Wageningen Agricultural University, NL-6703 HA Wageningen, The Netherlands
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Ronald P. de Vries
Section Molecular Genetics of Industrial Microorganisms, Wageningen Agricultural University, NL-6703 HA Wageningen, The Netherlands
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Jaap Visser
Section Molecular Genetics of Industrial Microorganisms, Wageningen Agricultural University, NL-6703 HA Wageningen, The Netherlands
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Leo H. de Graaff
Section Molecular Genetics of Industrial Microorganisms, Wageningen Agricultural University, NL-6703 HA Wageningen, The Netherlands
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DOI: 10.1128/AEM.64.10.3615-3619.1998
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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 fungusAspergillus 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 thexlnB, 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 andeglB, indicating that transcriptional regulation by XlnR goes beyond the genes encoding xylanolytic enzymes and includes regulation of two endoglucanase-encoding genes.

  • Copyright © 1998 American Society for Microbiology
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The Transcriptional Activator XlnR Regulates Both Xylanolytic and Endoglucanase Gene Expression inAspergillus niger
Noël N. M. E. van Peij, Marco M. C. Gielkens, Ronald P. de Vries, Jaap Visser, Leo H. de Graaff
Applied and Environmental Microbiology Oct 1998, 64 (10) 3615-3619; DOI: 10.1128/AEM.64.10.3615-3619.1998

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The Transcriptional Activator XlnR Regulates Both Xylanolytic and Endoglucanase Gene Expression inAspergillus niger
Noël N. M. E. van Peij, Marco M. C. Gielkens, Ronald P. de Vries, Jaap Visser, Leo H. de Graaff
Applied and Environmental Microbiology Oct 1998, 64 (10) 3615-3619; DOI: 10.1128/AEM.64.10.3615-3619.1998
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KEYWORDS

Aspergillus niger
cellulase
Fungal Proteins
Gene Expression Regulation, Fungal
Glucosidases
Trans-Activators
Transcription, Genetic

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