Glycosyl hydrolase family 76. Family of alpha-1,6-mannanases.

Predicted alpha-1,6-mannanase, GH76 family [Carbohydrate transport and metabolism].

Beta-L-arabinofuranosidase, GH127. One member of this family, from Bidobacterium longicum, UniProtKB:E8MGH8, has been characterized as an unusual beta-L-arabinofuranosidase enzyme, EC:3.2.1.185. It rleases l-arabinose from the l-arabinofuranose (Araf)-beta1,2-Araf disaccharide and also transglycosylates 1-alkanols with retention of the anomeric configuration. Terminal beta-l-arabinofuranosyl residues have been found in arabinogalactan proteins from a mumber of different plantt species. beta-l-Arabinofuranosyl linkages with 1-4 arabinofuranosides are also found in the sugar chains of extensin and solanaceous lectins, hydroxyproline (Hyp)2-rich glycoproteins that are widely observed in plant cell wall fractions. The critical residue for catalytic activity is Glu-338, in a ET/SCAS sequence context.

AGE domain; N-acyl-D-glucosamine 2-epimerase domain; Responsible for intermediate epimerization during biosynthesis of N-acetylneuraminic acid. Catalytic mechanism is believed to be via nucleotide elimination and readdition and is ATP modulated. AGE is structurally and mechanistically distinct from the other four types of epimerases. The AGE domain monomer is composed of an alpha(6)/alpha(6)-barrel, the structure of which is also found in glucoamylase and cellulase. The active form is a homodimer. The alignment also contains subtype III mannose 6-phosphate isomerases.

Cyclases involved in the biosynthesis of lantibiotics, and similar proteins. LanC is the cyclase enzyme of the lanthionine synthetase. Lanthionine is a lantibiotic, a unique class of peptide antibiotics. They are ribosomally synthesized as a precursor peptide and then post-translationally modified to contain thioether cross-links called lanthionines (Lans) or methyllanthionines (MeLans), in addition to 2,3-didehydroalanine (Dha) and (Z)-2,3-didehydrobutyrine (Dhb). These unusual amino acids are introduced by the dehydration of serine and threonine residues, followed by thioether formation via addition of cysteine thiols, catalysed by LanB and LanC or LanM. LanC, the cyclase component, is a zinc metalloprotein, whose bound metal has been proposed to activate the thiol substrate for nucleophilic addition. A related domain is also present in LanM and other pro- and eukaryotic proteins with poorly characterized functions.

Structureof the GH76A alpha-1,6-mannanase from Salegentibacter sp. HEL1_6 [Salegentibacter sp. Hel_I_6],6SHD_B Structure of the GH76A alpha-1,6-mannanase from Salegentibacter sp. HEL1_6 [Salegentibacter sp. Hel_I_6],6SHD_C Structure of the GH76A alpha-1,6-mannanase from Salegentibacter sp. HEL1_6 [Salegentibacter sp. Hel_I_6]

ChainA, Alpha-1,6-endo-mannanase GH76A mutant [Salegentibacter sp. Hel_I_6]

Aninactive (D136A and D137A) variant of alpha-1,6-mannanase, GH76A of Salegentibacter sp. HEL1_6 in complex with alpha-1,6-mannotetrose [Salegentibacter sp. Hel_I_6]

ChainA, Lin0763 protein [Listeria innocua]

ChainA, Alpha-1,6-mannanase [Niallia circulans]

Mannan endo-1,6-alpha-mannosidase DCW1 OS=Candida glabrata (strain ATCC 2001 / CBS 138 / JCM 3761 / NBRC 0622 / NRRL Y-65) OX=284593 GN=DCW1 PE=3 SV=1

Mannan endo-1,6-alpha-mannosidase DCW1 OS=Saccharomyces cerevisiae (strain ATCC 204508 / S288c) OX=559292 GN=DCW1 PE=1 SV=1

Putative mannan endo-1,6-alpha-mannosidase C1198.07c OS=Schizosaccharomyces pombe (strain 972 / ATCC 24843) OX=284812 GN=SPBC1198.07c PE=3 SV=2

Mannan endo-1,6-alpha-mannosidase DCW1 OS=Ashbya gossypii (strain ATCC 10895 / CBS 109.51 / FGSC 9923 / NRRL Y-1056) OX=284811 GN=DCW1 PE=3 SV=2

Mannan endo-1,6-alpha-mannosidase DCW1 OS=Candida albicans (strain SC5314 / ATCC MYA-2876) OX=237561 GN=DCW1 PE=1 SV=1