Beta-xylosidase [Carbohydrate transport and metabolism].

Beta xylosidase C-terminal Concanavalin A-like domain. This domain is found to the C-terminus of the pfam04616 domain. This domain adopts a concanavalin A-like fold.

Glycosyl hydrolase family 43, such as Selenomonas ruminantium beta-D-xylosidase SXA. This glycosyl hydrolase family 43 (GH43) includes enzymes that have been characterized to mainly have beta-1,4-xylosidase (beta-D-xylosidase;xylan 1,4-beta-xylosidase; EC 3.2.1.37) activity, including Selenomonas ruminantium (Xsa;Sxa;SXA), Bifidobacterium adolescentis ATCC 15703 (XylC;XynB;BAD_0428) and Bacillus sp. KK-1 XylB. They 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. These enzymes possess an additional C-terminal beta-sandwich domain that restricts access for substrates to a portion of the active site to form a pocket. The active-site pockets comprise of two subsites, with binding capacity for two monosaccharide moieties and a single route of access for small molecules such as substrate. 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 hydrolases family 43. The glycosyl hydrolase family 43 contains members that are arabinanases. Arabinanases hydrolyze the alpha-1,5-linked L-arabinofuranoside backbone of plant cell wall arabinans. The structure of arabinanase Arb43A from Cellvibrio japonicus reveals a five-bladed beta-propeller fold. 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 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-D-xylosidase [Geobacillus stearothermophilus],2EXK_B Chain B, beta-D-xylosidase [Geobacillus stearothermophilus],2EXK_C Chain C, beta-D-xylosidase [Geobacillus stearothermophilus],2EXK_D Chain D, beta-D-xylosidase [Geobacillus stearothermophilus]

ChainA, beta-D-xylosidase [Geobacillus stearothermophilus],2EXI_B Chain B, beta-D-xylosidase [Geobacillus stearothermophilus],2EXI_C Chain C, beta-D-xylosidase [Geobacillus stearothermophilus],2EXI_D Chain D, beta-D-xylosidase [Geobacillus stearothermophilus]

Structureof the family43 beta-Xylosidase from geobacillus stearothermophilus [Geobacillus stearothermophilus],2EXH_B Structure of the family43 beta-Xylosidase from geobacillus stearothermophilus [Geobacillus stearothermophilus],2EXH_C Structure of the family43 beta-Xylosidase from geobacillus stearothermophilus [Geobacillus stearothermophilus],2EXH_D Structure of the family43 beta-Xylosidase from geobacillus stearothermophilus [Geobacillus stearothermophilus]

ChainA, beta-D-xylosidase [Geobacillus stearothermophilus],2EXJ_B Chain B, beta-D-xylosidase [Geobacillus stearothermophilus],2EXJ_C Chain C, beta-D-xylosidase [Geobacillus stearothermophilus],2EXJ_D Chain D, beta-D-xylosidase [Geobacillus stearothermophilus]

Beta-d-xylosidase,A Family 43 Glycoside Hydrolase [Clostridium acetobutylicum ATCC 824],1Y7B_B Beta-d-xylosidase, A Family 43 Glycoside Hydrolase [Clostridium acetobutylicum ATCC 824],1Y7B_C Beta-d-xylosidase, A Family 43 Glycoside Hydrolase [Clostridium acetobutylicum ATCC 824],1Y7B_D Beta-d-xylosidase, A Family 43 Glycoside Hydrolase [Clostridium acetobutylicum ATCC 824]

Beta-xylosidase OS=Bacillus subtilis (strain 168) OX=224308 GN=xynB PE=1 SV=2

Beta-xylosidase OS=Bacillus pumilus OX=1408 GN=xynB PE=1 SV=2

Putative beta-xylosidase OS=Escherichia coli (strain K12) OX=83333 GN=yagH PE=3 SV=1

Xylan 1,3-beta-xylosidase OS=Vibrio sp. OX=678 GN=xloA PE=1 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