1 Introduction</h5> Chitin and cellulose are two most important and highly recalcitrant polysaccharides widely occurring in nature. For an efficient degradation of chitin or cellulose, bacteria generally utilize an enzyme system including nonprocessive endo-type glycoside hydrolases in tandem with processive exo-type glycoside hydrolases [1,2] . Previous studies pointed out that some bacteria produce polysaccharides binding proteins that were capable of increasing substrate accessibility and thus potentiating hydrolytic enzymes  . Recent studies highlighted that some of these proteins were capable of catalyzing the cleavage of glycosidic bonds of polysaccharides via an oxidative mechanism, generating a series of oxidized oligosaccharides [4,5] . These bacterial chitin- or cellulose-specific oxidative enzymes are now systematically classified as Auxiliary Activity 10 family (AA10) in the Carbohydrate Active Enzymes (CAZy) database ( www.cazy.org )  . Functionally, AA10 LPMOs can be divided into two subclasses: chitin-oxidative (i.e. Sm CBP21 from Serratia marcescens ) and cellulose-oxidative LPMOs (i.e. CelS2 from Streptomyces coelicolor A3(2))  .</P>Based on genome information, the occurrence of lpmo genes has been confirmed in many chitinolytic and cellulolytic bacteria. It remains to be elucidated whether most of these putative LPMOs have oxidative activities, their large number, however, emphasizes the importance of their
International Journal of Biological Macromolecules – Elsevier
Published: Aug 1, 2015
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