title: Molecular cloning, purification, and characterization of a novel, acidic, pH-stable endoglucanase from Martelella mediterranea.
abstract: A novel gene encoding an endoglucanase designated Cel5D was cloned from a marine bacterium Martelella mediterranea by genomic library. The gene had a 1,113 bp opening reading frame encoding a 371-amino-acid protein with a molecular mass of 40,508 Da and containing a putative signal peptide (41 amino acids). Cel5D had low similarity (48-51% identity) with other known endoglucanases and consisted of one single catalytic domain, which belonged to the glycosyl hydrolase family 5. The maximum activity of Cel5D was observed at 60 degrees C and pH 5.0. Cel5D displayed broad pH stability within the range of pH 3.0-11.0 and retained hydrolytic activity in the presence of a wide variety of metal ions and some chemical reagents. These characteristics suggest that the enzyme has considerable potential in industrial applications.
authors.affiliation: State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, PR China.
authors.forename: Junli
authors.initials: J
authors.lastname: Dong
authors.forename: Yuzhi
authors.initials: Y
authors.lastname: Hong
authors.forename: Zongze
authors.initials: Z
authors.lastname: Shao
authors.forename: Ziduo
authors.initials: Z
authors.lastname: Liu
mesh_terms: D020561:Alphaproteobacteria / Q000201:enzymology* / Q000235:genetics* / Q000302:isolation & purification; D000595:Amino Acid Sequence; D001483:Base Sequence; D002480:Cellulase / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism*; D002681:China; D003001:Cloning, Molecular; D017931:DNA Primers / Q000235:genetics; D004269:DNA, Bacterial / Q000235:genetics; D004795:Enzyme Stability; D005798:Genes, Bacterial; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008969:Molecular Sequence Data; D008970:Molecular Weight; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D013379:Substrate Specificity; D014871:Water Microbiology
chemical_list: D017931:DNA Primers; D004269:DNA, Bacterial; D011994:Recombinant Proteins; D002480:Cellulase