Glycosyl hydrolase family 43, such as Bacteroides ovatus alpha-L-arabinofuranosidase (BoGH43, XynB). This glycosyl hydrolase family 43 (GH43) subgroup includes enzymes that have been characterized to have alpha-L-arabinofuranosidase (EC 3.2.1.55) and beta-1,4-xylosidase (beta-D-xylosidase;xylan 1,4-beta-xylosidase; EC 3.2.1.37) activities. Beta-1,4-xylosidases are part of an array of hemicellulases that are involved in the final breakdown of plant cell-wall whereby they degrade xylan. They hydrolyze beta-1,4 glycosidic bonds between two xylose units in short xylooligosaccharides. These are inverting enzymes (i.e. they invert the stereochemistry of the anomeric carbon atom of the substrate) that have an aspartate as the catalytic general base, a glutamate as the catalytic general acid and another aspartate that is responsible for pKa modulation and orienting the catalytic acid. Also included in this subfamily are Bacteroides ovatus alpha-L-arabinofuranosidases, BoGH43A and BoGH43B, both having a two-domain architecture, consisting of an N-terminal 5-bladed beta-propeller domain harboring the catalytic active site, and a C-terminal beta-sandwich domain. However, despite significant functional overlap between these two enzymes, BoGH43A and BoGH43B share just 41% sequence identity. The latter appears to be significantly less active on the same substrates, suggesting that these paralogs may play subtly different roles during the degradation of xyloglucans from different sources, or may function most optimally at different stages in the catabolism of xyloglucan oligosaccharides (XyGOs), for example before or after hydrolysis of certain side-chain moieties. It also includes Phanerochaete chrysosporium BKM-F-1767 Xyl, a bifunctional xylosidase/arabinofuranosidase. A common structural feature of GH43 enzymes is a 5-bladed beta-propeller domain that contains the catalytic acid and catalytic base. A long V-shaped groove, partially enclosed at one end, forms a single extended substrate-binding surface across the face of the propeller.

Glycosyl hydrolase family 10.

Glycosyl hydrolase family 10.

Beta-xylosidase [Carbohydrate transport and metabolism].

Glycosyl hydrolase family 43, beta-D-xylosidases and arabinofuranosidases. This glycosyl hydrolase family 43 (GH43) subgroup includes mostly enzymes that have been annotated as having beta-1,4-xylosidase (beta-D-xylosidase;xylan 1,4-beta-xylosidase; EC 3.2.1.37) activity, including Selenomonas ruminantium beta-D-xylosidase SXA. These are part of an array of hemicellulases that are involved in the final breakdown of plant cell-wall whereby they degrade xylan. They hydrolyze beta-1,4 glycosidic bonds between two xylose units in short xylooligosaccharides. It also includes various GH43 family GH43 arabinofuranosidases (EC 3.2.1.55) including Humicola insolens alpha-L-arabinofuranosidase AXHd3, Bacteroides ovatus alpha-L-arabinofuranosidase (BoGH43, XynB), and the bifunctional Phanerochaete chrysosporium xylosidase/arabinofuranosidase (Xyl;PcXyl). GH43 are inverting enzymes (i.e. they invert the stereochemistry of the anomeric carbon atom of the substrate) that have an aspartate as the catalytic general base, a glutamate as the catalytic general acid and another aspartate that is responsible for pKa modulation and orienting the catalytic acid. Many GH43 enzymes display both alpha-L-arabinofuranosidase and beta-D-xylosidase activity using aryl-glycosides as substrates. A common structural feature of GH43 enzymes is a 5-bladed beta-propeller domain that contains the catalytic acid and catalytic base. A long V-shaped groove, partially enclosed at one end, forms a single extended substrate-binding surface across the face of the propeller.

ChainA, Beta-xylanase [Bacteroides intestinalis],7ERL_B Chain B, Beta-xylanase [Bacteroides intestinalis]

Crystalstructure of a novel reducing-end xylose-releasing exo-oligoxylanase (XynA) belonging to GH10 family (space group P1211) [Xanthomonas citri pv. citri str. 306],4PMU_B Crystal structure of a novel reducing-end xylose-releasing exo-oligoxylanase (XynA) belonging to GH10 family (space group P1211) [Xanthomonas citri pv. citri str. 306],4PMU_C Crystal structure of a novel reducing-end xylose-releasing exo-oligoxylanase (XynA) belonging to GH10 family (space group P1211) [Xanthomonas citri pv. citri str. 306],4PMU_D Crystal structure of a novel reducing-end xylose-releasing exo-oligoxylanase (XynA) belonging to GH10 family (space group P1211) [Xanthomonas citri pv. citri str. 306],4PMU_E Crystal structure of a novel reducing-end xylose-releasing exo-oligoxylanase (XynA) belonging to GH10 family (space group P1211) [Xanthomonas citri pv. citri str. 306],4PMU_F Crystal structure of a novel reducing-end xylose-releasing exo-oligoxylanase (XynA) belonging to GH10 family (space group P1211) [Xanthomonas citri pv. citri str. 306]

Crystalstructure of a novel reducing-end xylose-releasing exo-oligoxylanase (XynA) belonging to GH10 family (space group P43212) [Xanthomonas citri pv. citri str. 306],4PMV_B Crystal structure of a novel reducing-end xylose-releasing exo-oligoxylanase (XynA) belonging to GH10 family (space group P43212) [Xanthomonas citri pv. citri str. 306]

Crystalstructure of a thermostable glycoside hydrolase family 43 {beta}-1,4-xylosidase from Geobacillus thermoleovorans IT-08 [Geobacillus thermoleovorans],5Z5F_A Crystal structure of a thermostable glycoside hydrolase family 43 {beta}-1,4-xylosidase from Geobacillus thermoleovorans IT-08 in complex with L-arabinose [Geobacillus thermoleovorans],5Z5H_A Crystal structure of a thermostable glycoside hydrolase family 43 {beta}-1,4-xylosidase from Geobacillus thermoleovorans IT-08 in complex with D-xylose [Geobacillus thermoleovorans],5Z5I_A Crystal structure of a thermostable glycoside hydrolase family 43 {beta}-1,4-xylosidase from Geobacillus thermoleovorans IT-08 in complex with L-arabinose and D-xylose [Geobacillus thermoleovorans]

Family10 xylanase [Cellvibrio mixtus]

Endo-1,4-beta-xylanase A OS=Bacteroides ovatus OX=28116 GN=xylI PE=2 SV=1

Endo-1,4-beta-xylanase A OS=Prevotella ruminicola OX=839 GN=xynA PE=3 SV=1

Non-reducing end alpha-L-arabinofuranosidase BoGH43A OS=Bacteroides ovatus (strain ATCC 8483 / DSM 1896 / JCM 5824 / BCRC 10623 / CCUG 4943 / NCTC 11153) OX=411476 GN=BACOVA_02654 PE=1 SV=1

Xylosidase/arabinosidase OS=Butyrivibrio fibrisolvens OX=831 GN=xylB PE=3 SV=1

Non-reducing end alpha-L-arabinofuranosidase BoGH43B OS=Bacteroides ovatus (strain ATCC 8483 / DSM 1896 / JCM 5824 / BCRC 10623 / CCUG 4943 / NCTC 11153) OX=411476 GN=BACOVA_02656 PE=1 SV=2