Cloning, characterization and functional expression of an endoglucanase-encoding gene from the phytopathogenic fungus Macrophomina phaseolina.
An endoglucanase-encoding clone (egl2) was isolated from the phytopathogenic soilborne deuteromycete fungus Macrophomina phaseolina (Mp). Clones were obtained from a cDNA library by functional expression in Escherichia coli. The egl2 clone hybridized to a 1.3-kb mRNA. Expression is induced by carboxymethylcellulose (CMC) and repressed by glucose. The deduced amino acid (aa) sequence revealed strong similarity to the egl3 from Trichoderma reesei (Tr) (72% for identical residues and 81% with conservative substitution over a span of 324 aa). The Mp egl2 lacks the cellulose-binding domain and linker region found in the Tr egl3. Different codon usage between the two fungi resulted in a much shorter span of nucleotide homology. The Egl2 protein cleaves cellodextrins with continguous beta, 1-4 linkages of four and larger, and shows activity against CMC and birchwood xylan.
Wang
H
H
Purdue University, West Lafayette, IN 47907, USA.
Jones
R W
RW
D000595:Amino Acid Sequence; D001483:Base Sequence; D015152:Blotting, Northern; D002480:Cellulase / Q000235:genetics* / Q000378:metabolism; D003001:Cloning, Molecular; D004271:DNA, Fungal; D005800:Genes, Fungal; D003904:Mitosporic Fungi / Q000201:enzymology / Q000235:genetics*; D008969:Molecular Sequence Data; D017386:Sequence Homology, Amino Acid; D013379:Substrate Specificity
D004271:DNA, Fungal; D002480:Cellulase