Glycosyl hydrolase family 43 proteins similar to Lactobacillus brevis alpha-L-arabinofuranosidase LbAraf43 and Geobacillus thermoleovorans GbtXyl43B. This uncharacterized glycosyl hydrolase family 43 (GH43) subgroup belongs to a subgroup which includes enzymes with beta-xylosidase (EC 3.2.1.37), alpha-L-arabinofuranosidase (EC 3.2.1.55) and possibly bifunctional xylosidase/arabinofuranosidase activities, similar to Lactobacillus brevis alpha-L-arabinofuranosidase LbAraf43 and Geobacillus thermoleovorans IT-08 beta-xylosidase / exo-xylanase (GbtXyl43B). It belongs to the glycosyl hydrolase clan F (according to carbohydrate-active enzymes database (CAZY)) which includes family 43 (GH43) and 62 (GH62) families. 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.

Glycosyl hydrolase family 43 such as Lactobacillus brevis alpha-L-arabinofuranosidase LbAraf43. This glycosyl hydrolase family 43 (GH43) subgroup includes characterized enzymes with alpha-L-arabinofuranosidase (EC 3.2.1.55) activity. It belongs to the glycosyl hydrolase clan F (according to carbohydrate-active enzymes database (CAZY)) which includes family 43 (GH43) and 62 (GH62) families. 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. Characterized enzymes belonging to this subgroup include Lactobacillus brevis (LbAraf43) and Weissella sp (WAraf43) which show activity with similar catalytic efficiency on 1,5-alpha-L-arabinooligosaccharides with a degree of polymerization (DP) of 2-3; size is limited by an extended loop at the entrance to the active site. 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.

Beta-xylosidase, GH43 family [Carbohydrate transport and metabolism].

Glycosyl hydrolase family 43 proteins such as Lactobacillus brevis alpha-L-arabinofuranosidase LbAraf43 and Geobacillus thermoleovorans GbtXyl43B. This glycosyl hydrolase family 43 (GH43) subgroup includes enzymes with beta-xylosidase (EC 3.2.1.37), alpha-L-arabinofuranosidase (EC 3.2.1.55) and possibly bifunctional xylosidase/arabinofuranosidase activities. In addition to Lactobacillus brevis alpha-L-arabinofuranosidase LbAraf43 and Geobacillus thermoleovorans IT-08 beta-xylosidase / exo-xylanase (GbtXyl43B). It belongs to the glycosyl hydrolase clan F (according to carbohydrate-active enzymes database (CAZY)) which includes family 43 (GH43) and 62 (GH62) familiesGH43 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.

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.

Crystalstructure of exo-1,5-alpha-L-arabinofuranosidase [Streptomyces avermitilis MA-4680 = NBRC 14893],3AKG_A Crystal structure of exo-1,5-alpha-L-arabinofuranosidase complexed with alpha-1,5-L-arabinofuranobiose [Streptomyces avermitilis MA-4680 = NBRC 14893],3AKH_A Crystal structure of exo-1,5-alpha-L-arabinofuranosidase complexed with alpha-1,5-L-arabinofuranotriose [Streptomyces avermitilis MA-4680 = NBRC 14893],3AKI_A Crystal structure of exo-1,5-alpha-L-arabinofuranosidase complexed with alpha-L-arabinofuranosyl azido [Streptomyces avermitilis MA-4680 = NBRC 14893]

Beta-xylosidase,family 43 glycosyl hydrolase from Clostridium acetobutylicum [Clostridium acetobutylicum]

ChainA, Alpha-L-arabinofuranosidase II [Levilactobacillus brevis],5M8B_B Chain B, Alpha-L-arabinofuranosidase II [Levilactobacillus brevis]

Crystalstructure of a GH43 arabonofuranosidase from Weissella sp. strain 142 [Weissella cibaria],5M8E_B Crystal structure of a GH43 arabonofuranosidase from Weissella sp. strain 142 [Weissella cibaria]

Crystalstructure of a thermostable family-43 glycoside hydrolase [Halothermothrix orenii H 168],4QQS_B Crystal structure of a thermostable family-43 glycoside hydrolase [Halothermothrix orenii H 168]

Extracellular exo-alpha-(1->5)-L-arabinofuranosidase OS=Streptomyces avermitilis (strain ATCC 31267 / DSM 46492 / JCM 5070 / NBRC 14893 / NCIMB 12804 / NRRL 8165 / MA-4680) OX=227882 GN=Araf43A PE=1 SV=1

Extracellular exo-alpha-(1->5)-L-arabinofuranosidase OS=Streptomyces chartreusis OX=1969 PE=1 SV=1

Alpha-L-arabinofuranosidase B OS=Magnaporthe oryzae (strain 70-15 / ATCC MYA-4617 / FGSC 8958) OX=242507 GN=abfB PE=1 SV=1

Probable arabinan endo-1,5-alpha-L-arabinosidase C OS=Aspergillus niger (strain CBS 513.88 / FGSC A1513) OX=425011 GN=abnC PE=3 SV=1

Probable arabinan endo-1,5-alpha-L-arabinosidase C OS=Neosartorya fischeri (strain ATCC 1020 / DSM 3700 / CBS 544.65 / FGSC A1164 / JCM 1740 / NRRL 181 / WB 181) OX=331117 GN=abnC PE=3 SV=1