Association of Cotton leaf curl Burewala virus and its satellite molecules with leaf distortion symptoms of cotton in India

Abstract

Interest in xylanases from different sources has increased markedly in the past decade, in part because of the application of these enzymes in the pulp and paper industry. Purity and purification costs are becoming important issues in modern biotechnology as the industry matures and competitive products reach the mar- ketplace. Thus, new paths for successful and efficient xylanase recovery have to be followed. This article reviews the isolation and purification methods used for the recovery of microbial xylanases. Origins and applications of xylanases are described, highlighting the special features of this class of enzymes, such as the carbohydrate-binding domains (CBDs) and their importance in the development of affinity meth- odologies to increase and facilitate xylanase purification. Implications of recombinant DNA technology for the isolation and purification of xylanases are evaluated. Several purification procedures are analyzed, tak- ing into consideration the sequence of the methods used in each and the number of times each method is Paula Sá-Pereira,* Helena Paveia, Maria Costa-Ferreira, and Maria Raquel Aires-Barros used. New directions to improve xylanase separation and purification from fermentation media are described. Index Entries: Xylanase; purification strategies; CBD; biospecific affinity.