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].

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.

alpha-galactosidase; Provisional

Glycoside Hydrolases Family 4; Phospho-beta-glucosidase. Some bacteria simultaneously translocate and phosphorylate disaccharides via the phosphoenolpyruvate-dependent phosphotransferase system (PEP-PTS). After translocation, these phospho-disaccharides may be hydrolyzed by the GH4 glycoside hydrolases such as the phospho-beta-glucosidases. Other organisms (such as archaea and Thermotoga maritima ) lack the PEP-PTS system, but have several enzymes normally associated with the PEP-PTS operon. The 6-phospho-beta-glucosidase from Thermotoga maritima hydrolylzes cellobiose 6-phosphate (6P) into glucose-6P and glucose, in an NAD+ and Mn2+ dependent fashion. The Escherichia coli 6-phospho-beta-glucosidase (also called celF) hydrolyzes a variety of phospho-beta-glucosides including cellobiose-6P, salicin-6P, arbutin-6P, and gentobiose-6P. Phospho-beta-glucosidases 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.

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]

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

Crystalstructure of citrate complex of alpha-glucuronidase (TM0752)from Thermotoga maritima [Thermotoga maritima MSB8],7CTD_A Chain A, Alpha-glucosidase, putative [Thermotoga maritima MSB8],7CTL_A Chain A, Alpha-glucosidase, putative [Thermotoga maritima MSB8]

Crystalstructure of a putative alpha-glucosidase from Thermotoga neapolitana [Thermotoga neapolitana DSM 4359],3U95_B Crystal structure of a putative alpha-glucosidase from Thermotoga neapolitana [Thermotoga neapolitana DSM 4359],3U95_C Crystal structure of a putative alpha-glucosidase from Thermotoga neapolitana [Thermotoga neapolitana DSM 4359],3U95_D Crystal structure of a putative alpha-glucosidase from Thermotoga neapolitana [Thermotoga neapolitana DSM 4359],3U95_E Crystal structure of a putative alpha-glucosidase from Thermotoga neapolitana [Thermotoga neapolitana DSM 4359],3U95_F Crystal structure of a putative alpha-glucosidase from Thermotoga neapolitana [Thermotoga neapolitana DSM 4359]

ChainA, Alpha-glucosidase, putative [Thermotoga maritima MSB8],7CTM_A Chain A, Alpha-glucosidase, putative [Thermotoga maritima MSB8]

Alpha-glucosidase OS=Thermotoga maritima (strain ATCC 43589 / DSM 3109 / JCM 10099 / NBRC 100826 / MSB8) OX=243274 GN=aglA PE=1 SV=2

Alpha-glucosidase OS=Thermotoga neapolitana OX=2337 GN=aglA PE=1 SV=2

Alpha-galactosidase OS=Escherichia coli (strain K12) OX=83333 GN=melA PE=1 SV=1

Alpha-galactosidase OS=Bacillus subtilis (strain 168) OX=224308 GN=melA PE=1 SV=1

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