Keyword search (4,163 papers available)

"Ram AFJ" Authored Publications:

Title Authors PubMed ID
1 An examination of the quinic acid utilization genes in Aspergillus niger reveals the involvement of two pH-dependent permeases Sgro M; Reid ID; Arentshorst M; Ram AFJ; Tsang A; 40853219
GENOMICS
2 Identification of a Conserved Transcriptional Activator-Repressor Module Controlling the Expression of Genes Involved in Tannic Acid Degradation and Gallic Acid Utilization in Aspergillus niger Arentshorst M; Falco MD; Moisan MC; Reid ID; Spaapen TOM; van Dam J; Demirci E; Powlowski J; Punt PJ; Tsang A; Ram AFJ; 37744122
CSFG
3 Utilization of ferulic acid in Aspergillus niger requires the transcription factor FarA and a newly identified Far-like protein (FarD) that lacks the canonical Zn(II)2Cys6 domain Arentshorst M; Reijngoud J; van Tol DJC; Reid ID; Arendsen Y; Pel HJ; van Peij NNME; Visser J; Punt PJ; Tsang A; Ram AFJ; 37746181
CSFG
4 Functional analysis of the protocatechuate branch of the β-ketoadipate pathway in Aspergillus niger Sgro M; Chow N; Olyaei F; Arentshorst M; Geoffrion N; Ram AFJ; Powlowski J; Tsang A; 37399977
BIOLOGY
5 Loss of function of the carbon catabolite repressor CreA leads to low but inducer-independent expression from the feruloyl esterase B promoter in Aspergillus niger Reijngoud J; Arentshorst M; Ruijmbeek C; Reid I; Alazi ED; Punt PJ; Tsang A; Ram AFJ; 33738610
CSFG
6 Genetic Characterization of Mutations Related to Conidiophore Stalk Length Development in Aspergillus niger Laboratory Strain N402 Demirci E; Arentshorst M; Yilmaz B; Swinkels A; Reid ID; Visser J; Tsang A; Ram AFJ; 33959152
CSFG
7 Deletion of the Aspergillus niger Pro-Protein Processing Protease Gene kexB Results in a pH-Dependent Morphological Transition during Submerged Cultivations and Increases Cell Wall Chitin Content. van Leeuwe TM, Arentshorst M, Forn-Cuní G, Geoffrion N, Tsang A, Delvigne F, Meijer AH, Ram AFJ, Punt PJ 33276589
CSFG
8 The pathway intermediate 2-keto-3-deoxy-L-galactonate mediates the induction of genes involved in D-galacturonic acid utilization in Aspergillus niger. Alazi E, Khosravi C, Homan TG, du Pré S, Arentshorst M, Di Falco M, Pham TTM, Peng M, Aguilar-Pontes MV, Visser J, Tsang A, de Vries RP, Ram AFJ 28417461
CSFG
9 W361R mutation in GaaR, the regulator of D-galacturonic acid-responsive genes, leads to constitutive production of pectinases in Aspergillus niger. Alazi E, Niu J, Otto SB, Arentshorst M, Pham TTM, Tsang A, Ram AFJ 30298571
CSFG

 

Title:W361R mutation in GaaR, the regulator of D-galacturonic acid-responsive genes, leads to constitutive production of pectinases in Aspergillus niger.
Authors:Alazi E,  Niu J,  Otto SB,  Arentshorst M,  Pham TTM,  Tsang A,  Ram AFJ
Link:https://www.ncbi.nlm.nih.gov/pubmed/30298571?dopt=Abstract
DOI:10.1002/mbo3.732
Publication:MicrobiologyOpen
Keywords:Aspergillus niger;  CRISPR-Cas9;  constitutively active transcription factor;  missense mutation;  pectinase;  transcription factor localization; 
PMID:30298571 Category:Microbiologyopen Date Added:2019-06-07
Dept Affiliation: CSFG
1 Molecular Microbiology and Biotechnology, Institute of Biology Leiden, Leiden University, Leiden, The Netherlands.
2 Centre for Structural and Functional Genomics, Concordia University, Montreal, Québec, Canada.

Description:

W361R mutation in GaaR, the regulator of D-galacturonic acid-responsive genes, leads to constitutive production of pectinases in Aspergillus niger.

Microbiologyopen. 2019 May;8(5):e00732

Authors: Alazi E, Niu J, Otto SB, Arentshorst M, Pham TTM, Tsang A, Ram AFJ

Abstract

Polysaccharides present in plant biomass, such as pectin, are the main carbon source for filamentous fungi. Aspergillus niger naturally secretes pectinases to degrade pectin and utilize the released monomers, mainly D-galacturonic acid. The transcriptional activator GaaR, the repressor of D-galacturonic acid utilization GaaX, and the physiological inducer 2-keto-3-deoxy-L-galactonate play important roles in the transcriptional regulation of D-galacturonic acid-responsive genes, which include the genes encoding pectinases. In this study, we described the mutations found in gaaX and gaaR that enabled constitutive (i.e., inducer-independent) expression of pectinases by A. niger. Using promoter-reporter strains (PpgaX-amdS) and polygalacturonic acid plate assays, we showed that W361R mutation in GaaR results in constitutive production of pectinases. Analysis of subcellular localization of C-terminally eGFP-tagged GaaR/GaaRW 361R revealed important differences in nuclear accumulation of N- versus C-terminally eGFP-tagged GaaR.

PMID: 30298571 [PubMed - in process]




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