Expression of genes encoding cellulolytic enzymes in some Aspergillus species.
Fermentation is an important industrial process for microbial metabolite development and has wide applications in various fields. Aspergillus is the most important genus of fungi used for the production of microbial enzymes such as cellulase. The Aspergillus genome encodes various cellulolytic enzymes. In this study, we assayed the gene expression and cellulolytic enzyme production of three isolates: A. niger (KSU009), A. terreus (KC462061), and A. flavus (KSU014). Two fermentation systems, submerged fermentation and biofilm fermentation (BF), were used for this purpose. Gene expression analysis by RT-PCR showed that cbhB, exo, eglA, eglB, eglC, and β-actin genes were differentially expressed in the two fermentation systems for these three isolates during enzyme production. Furthermore, the expression of all genes was found to be higher in the BF system. The six genes were not expressed in the isolates with no cellulolytic enzyme production. The isolates were identified by morphological and molecular methods, which were based on macroscopic characteristics and sequence analysis of ITS1, ITS2, and the 5.8S regions of rDNA.
Plant Pathology Research Institute, Agricultural Research Center, Giza, Egypt m.a.mahmoud75@gmail.com.
M A
MA
Mahmoud
Botany and Microbiology Department, College of Science, King Saud University, Riyadh, Saudi Arabia.
M R
MR
Al-Othman
Botany and Microbiology Department, College of Science, King Saud University, Riyadh, Saudi Arabia.
A R M
AR
Abd-El-Aziz
Central Laboratory of Organic agricultural, Agricultural Research Center, Giza, Egypt.
H A
HA
Metwaly
Plant Pathology Research Institute, Agricultural Research Center, Giza, Egypt.
H A
HA
Mohamed
D001230:Aspergillus / Q000201:enzymology* / Q000235:genetics* / Q000302:isolation & purification; D001483:Base Sequence; D002480:Cellulase / Q000235:genetics* / Q000378:metabolism; D005285:Fermentation / Q000235:genetics; D015966:Gene Expression Regulation, Fungal; D005800:Genes, Fungal; D010802:Phylogeny; D013045:Species Specificity; D014158:Transcription, Genetic; D001616:beta-Galactosidase / Q000378:metabolism
D001616:beta-Galactosidase; D002480:Cellulase