Glycoside Hydrolases Family 4; Alpha-glucosidases and alpha-galactosidases. linked to 3D####ucture

Alpha-galactosidase/6-phospho-beta-glucosidase, family 4 of glycosyl hydrolase [Carbohydrate transport and metabolism].

alpha-galactosidase; Provisional

Family 4 glycosyl hydrolase.

Glycoside Hydrases Family 4. Glycoside hydrolases cleave glycosidic bonds to release smaller sugars from oligo- or polysaccharides. Some bacteria simultaneously translocate and phosphorylate disaccharides via the phosphoenolpyruvate-dependent phosphotransferase system (PEP-PTS). After translocation, these phospho-disaccharides may be hydrolyzed by GH4 glycoside hydrolases. Other organisms (such as archaea and Thermotoga maritima) lack the PEP-PTS system, but have several enzymes normally associated with the PEP-PTS operon. GH4 family members include 6-phospho-beta-glucosidases, 6-phospho-alpha-glucosidases, alpha-glucosidases/alpha-glucuronidases (only from Thermotoga), and alpha-galactosidases. They require two cofactors, NAD+ and a divalent metal (Mn2+, Ni2+, Mg2+), for activity. Some also require reducing conditions. GH4 glycoside hydrolases are part of the NAD(P)-binding Rossmann fold superfamily, which includes a wide variety of protein families including the NAD(P)-binding domains of alcohol dehydrogenases, tyrosine-dependent oxidoreductases, glyceraldehyde-3-phosphate dehydrogenases, formate/glycerate dehydrogenases, siroheme synthases, 6-phosphogluconate dehydrogenases, aminoacid dehydrogenases, repressor rex, and NAD-binding potassium channel domains, among others.

Crystalstructure of putative glucosidase lplD from bacillus subtilis [Bacillus subtilis],3FEF_B Crystal structure of putative glucosidase lplD from bacillus subtilis [Bacillus subtilis],3FEF_C Crystal structure of putative glucosidase lplD from bacillus subtilis [Bacillus subtilis],3FEF_D Crystal structure of putative glucosidase lplD from bacillus subtilis [Bacillus subtilis]

alpha-glucosidaseA, AglA, from Thermotoga maritima in complex with maltose and NAD+ [Thermotoga maritima MSB8],1OBB_B alpha-glucosidase A, AglA, from Thermotoga maritima in complex with maltose and NAD+ [Thermotoga maritima MSB8]

2.3Acrystal structure of phospho-beta-glucosidase [Geobacillus stearothermophilus]

Crystalstructure of Gan4C, a GH4 6-phospho-glucosidase from Geobacillus stearothermophilus [Geobacillus stearothermophilus],5C3M_B Crystal structure of Gan4C, a GH4 6-phospho-glucosidase from Geobacillus stearothermophilus [Geobacillus stearothermophilus],5C3M_C Crystal structure of Gan4C, a GH4 6-phospho-glucosidase from Geobacillus stearothermophilus [Geobacillus stearothermophilus],5C3M_D Crystal structure of Gan4C, a GH4 6-phospho-glucosidase from Geobacillus stearothermophilus [Geobacillus stearothermophilus]

ChainA, Alpha-glucosidase, putative [Thermotoga maritima MSB8]

Alpha-galacturonidase OS=Lachnoclostridium phytofermentans (strain ATCC 700394 / DSM 18823 / ISDg) OX=357809 GN=Cphy_3396 PE=1 SV=1

Alpha-galacturonidase OS=Thermoanaerobacterium saccharolyticum (strain DSM 8691 / JW/SL-YS485) OX=1094508 GN=Tsac_0200 PE=1 SV=1

Alpha-galacturonidase OS=Thermoanaerobacter italicus (strain DSM 9252 / Ab9) OX=580331 GN=Thit_1733 PE=1 SV=1

Alpha-galacturonidase OS=Bacillus subtilis (strain 168) OX=224308 GN=lplD PE=1 SV=2

Alpha-galactosidase OS=Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720) OX=99287 GN=melA PE=3 SV=2