NDLI: Purification, Characterization, and Substrate Specificities of Multiple Xylanases from Streptomyces sp. Strain B-12-2

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Purification, Characterization, and Substrate Specificities of Multiple Xylanases from Streptomyces sp. Strain B-12-2

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Purification, Characterization, and Substrate Specificities of Multiple Xylanases from Streptomyces sp. Strain B-12-2

Content Provider	PubMed Central
Author	Graziano, Elegir George, Szakács Jeffries, Thomas W.
Abstract	The endoxylanase complex from Streptomyces sp. strain B-12-2 was purified and characterized. The organism forms five distinct xylanases in the absence of significant cellulase activity when grown on oat spelt xylan. This is the largest number of endoxylanases yet reported for a streptomycete. On the basis of their physiochemical characteristics, they can be divided into two groups: the first group (xyl 1a and xyl 1b) consists of low-molecular-mass (26.4 and 23.8 kDa, respectively) neutral- to high-pI (6.5 and 8.3, respectively) endoxylanases. Group 1 endoxylanases are unable to hydrolyze aryl-β-d-cellobioside, have low levels of activity against xylotetraose (X4) and limited activity against xylopentaose, produce little or no xylose, and form products having a higher degree of polymerization with complex substrates. These enzymes apparently carry out transglycosylation. The second group (xyl 2, xyl 3, and xyl 4) consists of high-molecular-mass (36.2, 36.2, and 40.5 kDa, respectively), low-pI (5.4, 5.0, and 4.8, respectively) xylanases. Group 2 endoxylanases are able to hydrolyze aryl-β-d-cellobioside, show higher levels of activity against X4, and hydrolyze xylopentaose completely with the formation of xylobiose and xylotriose plus limited amounts of X4 and xylose. The enzymes display intergroup synergism when acting on kraft pulp. Despite intragroup similarities, each enzyme exhibited a unique action pattern and physiochemical characteristic. xyl 2 was highly glycosylated, and xyl 1b (but no other enzyme) was completely inhibited by p-hydroxymercuribenzoate.
Starting Page	2609
File Format	PDF
ISSN	10985336
e-ISSN	10985336
Journal	Applied and Environmental Microbiology
Issue Number	7
Volume Number	60
Language	English
Publisher Date	1994-07-01
Access Restriction	Open
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Ecology Food Science Applied Microbiology and Biotechnology Biotechnology

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