title: Design and characterizations of two novel cellulases through single-gene shuffling of Cel12A (EG3) gene from Trichoderma reseei.
abstract: Cellulases have great potential to be widely used for industrial applications. In general, naturally occurring cellulases are not optimized and limited to meet the industrial needs. These limitations lead to demand for novel cellulases with enhanced enzymatic properties. Here, we describe the enzymatic and structural properties of two novel enzymes, EG3_S1 and EG3_S2, obtained through the single-gene shuffling approach of Cel12A(EG3) gene from Trichoderma reseei EG3_S1 and EG3_S2 shuffled enzymes display 59 and 75% identity in protein sequence with respect to native, respectively. Toward 4-MUC, the minimum activity of EG3_S1 was reported as 5.9-fold decrease in native at 35°C, whereas the maximum activity of EG3_S2 was reported as 15.4-fold increase in native activity at 40°C. Also, the diminished enzyme activity of EG3_S1 was reported within range of 0.6- to 0.8-fold of native and within range of 0.5- to 0.7-fold of native toward CMC and Na-CMC, respectively. For EG3_S2 enzyme, the improved enzymatic activities within range of 1.1- to 1.4-fold of native and within range of 1.1- to 1.6-fold of native were reported toward CMC and Na-CMC, respectively. Moreover, we have reported 6.5-fold increase in the kcat/Km ratio of EG3_S2 with respect to native and suggested EG3_S2 enzyme as more efficient catalysis for hydrolysis reactions than its native counterpart.
authors.affiliation: Faculty of Engineering and Natural Sciences, Molecular Biology, Genetics and Bioengineering, Sabanci University, 34956 Istanbul, Turkey.
authors.forename: Asli
authors.initials: A
authors.lastname: Yenenler
authors.affiliation: Department of Biostatistics and Medical Informatics, School of Medicine, Acibadem University, Atasehir, Istanbul, Turkey.
authors.forename: Osman Ugur
authors.initials: OU
authors.lastname: Sezerman
mesh_terms: D000595:Amino Acid Sequence; D044602:Cellulases / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism*; D003001:Cloning, Molecular; D032621:DNA Shuffling; D004795:Enzyme Stability; D008958:Models, Molecular; D010843:Pichia / Q000235:genetics; D011487:Protein Conformation; D015202:Protein Engineering; D016415:Sequence Alignment; D013379:Substrate Specificity; D014170:Transformation, Genetic; D014242:Trichoderma / Q000737:chemistry / Q000201:enzymology* / Q000235:genetics / Q000378:metabolism
chemical_list: D044602:Cellulases
keywords: Cel12A (EG3); Trichoderma reseei; endoglucanase; single-gene shuffling