A method for rapid purification and evaluation of catalytically distinct lignocellulolytic glycosyl hydrolases from thermotolerant fungus Acrophialophora sp.

摘要

A novel thermotolerant fungal strain P2 identified as Acrophialophora sp. was found to be a good source of cellulases and hemicellulases. A rapid approach was devised to purify different lignocellulolytic glycosyl hydrolases from secretome of Acrophialophora sp. employing separation of proteins by SDS-PAGE followed by renaturation, slicing of gel and elution of proteins in tandem with microtitre plate based method for assay of cellulases and hemicellulase activities. This approach resulted in purification of an array of glycosyl hydrolases i.e., CBH I (42.0 kDa), EG I (64.0 kDa), EG II (32.0 kDa), EG III (22.0 kDa), EG IV (20.0 kDa), Xyl I (28.0 kDa), Xyl II (20.6 kDa), beta-xylosidase (66.7 kDa) and alpha-arabinofuranosidase (66.0 kDa). The purified enzymes were analysed for physicochemical characters as well as substrate specificity. The enzyme extract from Acrophialophora sp. was evaluated for saccharification of alkali treated rice straw that primarily resulted in release of xylobiose, glucose, xylose, cellobiose and arabinose as the major hydrolysis products. Furthermore the proteome analysis by LTQ-Velos-Orbitrap mass spectrometry unveiled the identity of proteins involved in carbohydrate catabolism, stress as well as lipid and protein biosynthetic pathway. (C) 2016 Elsevier Ltd. All rights reserved.