Glycosyl hydrolase family 66. This family is a set of glycosyl hydrolase enzymes including cycloisomaltooligosaccharide glucanotransferase (EC:2.4.1.-) and dextranase (EC:3.2.1.11) activities.

Glycoside Hydrolase Family 66. Glycoside Hydrolase Family 66 contains proteins characterized as cycloisomaltooligosaccharide glucanotransferase (CITase) and dextranases from a variety of bacteria. CITase cyclizes part of a (1-6)-alpha-D-glucan (dextrans) chain by formation of a (1-6)-alpha-D-glucosidic bond. Dextranases catalyze the endohydrolysis of (1-6)-alpha-D-glucosidic linkages in dextran. Some members contain Carbohydrate Binding Module 35 (CBM35) domains, either C-terminal or inserted in the domain or both.

Carbohydrate Binding Module 35 (CBM35) domains similar to Lmo2446. This family includes carbohydrate binding module 35 (CBM35) domains that are appended to several carbohydrate binding enzymes. Some CBM35 domains belonging to this family are appended to glycoside hydrolase (GH) family domains, including glycoside hydrolase family 31 (GH31), for example the CBM35 domain of Lmo2446, an uncharacterized protein from Listeria monocytogenes EGD-e. These CBM35s are non-catalytic carbohydrate binding domains that facilitate the strong binding of the GH catalytic modules with their dedicated, insoluble substrates. GH31 has a wide range of hydrolytic activities such as alpha-glucosidase, alpha-xylosidase, 6-alpha-glucosyltransferase, or alpha-1,4-glucan lyase, cleaving a terminal carbohydrate moiety from a substrate that may be a starch or a glycoprotein. Most characterized GH31 enzymes are alpha-glucosidases.

Carbohydrate Binding Module 35 (CBM35) domains similar to Lmo2446. This family includes carbohydrate binding module 35 (CBM35) domains that are appended to several carbohydrate binding enzymes. Some CBM35 domains belonging to this family are appended to glycoside hydrolase (GH) family domains, including glycoside hydrolase family 31 (GH31), for example the CBM35 domain of Lmo2446, an uncharacterized protein from Listeria monocytogenes EGD-e. These CBM35s are non-catalytic carbohydrate binding domains that facilitate the strong binding of the GH catalytic modules with their dedicated, insoluble substrates. GH31 has a wide range of hydrolytic activities such as alpha-glucosidase, alpha-xylosidase, 6-alpha-glucosyltransferase, or alpha-1,4-glucan lyase, cleaving a terminal carbohydrate moiety from a substrate that may be a starch or a glycoprotein. Most characterized GH31 enzymes are alpha-glucosidases.

Carbohydrate Binding Module family 35 (CBM35), pectate lyase-like; appended mainly to enzymes that bind mannan (Man), xylan, glucuronic acid (GlcA) and possibly glucans. This family includes carbohydrate binding module family 35 (CBM35) domains that are non-catalytic carbohydrate binding domains that are appended mainly to enzymes that bind mannan (Man), xylan, glucuronic acid (GlcA) and possibly glucans. Included in this family are CBM35s of pectate lyases, including pectate lyase 10A from Cellvibrio japonicas, these enzymes release delta-4,5-anhydrogalaturonic acid (delta4,5-GalA) from pectin, thus identifying a signature molecule for plant cell wall degradation. CBM35s are unique in that they display conserved specificity through extensive sequence similarity but divergent function through their appended catalytic modules. They are known to bind alpha-D-galactose (Gal), mannan (Man), xylan, glucuronic acid (GlcA), a beta-polymer of mannose, and possibly glucans, forming four subfamilies based on general ligand specificities (galacto, urono, manno, and gluco configurations). In contrast to most CBMs that are generally rigid proteins, CBM35 undergoes significant conformational change upon ligand binding. Some CBM35s bind their ligands in a calcium-dependent manner, especially those binding uronic acids.

ChainA, Cycloisomaltooligosaccharide glucanotransferase [Niallia circulans]

ChainA, Cycloisomaltooligosaccharide glucanotransferase [Niallia circulans],3WNM_A Chain A, Cycloisomaltooligosaccharide glucanotransferase [Niallia circulans],3WNN_A Chain A, Cycloisomaltooligosaccharide glucanotransferase [Niallia circulans],3WNN_B Chain B, Cycloisomaltooligosaccharide glucanotransferase [Niallia circulans],3WNO_A Chain A, Cycloisomaltooligosaccharide glucanotransferase [Niallia circulans],3WNO_B Chain B, Cycloisomaltooligosaccharide glucanotransferase [Niallia circulans]

ChainA, Cycloisomaltooligosaccharide glucanotransferase [Niallia circulans],3WNP_B Chain B, Cycloisomaltooligosaccharide glucanotransferase [Niallia circulans]

CrystalStructure of Paenibacillus sp. 598K cycloisomaltooligosaccharide glucanotransferase [Paenibacillus sp. 598K],5X7H_A Crystal Structure of Paenibacillus sp. 598K cycloisomaltooligosaccharide glucanotransferase complexed with cycloisomaltoheptaose [Paenibacillus sp. 598K]

Crystalstructure of thermophilic dextranase from Thermoanaerobacter pseudethanolicus [Thermoanaerobacter pseudethanolicus ATCC 33223],5AXG_B Crystal structure of thermophilic dextranase from Thermoanaerobacter pseudethanolicus [Thermoanaerobacter pseudethanolicus ATCC 33223]

Cycloisomaltooligosaccharide glucanotransferase OS=Niallia circulans OX=1397 GN=cit PE=3 SV=1

Cycloisomaltooligosaccharide glucanotransferase OS=Niallia circulans OX=1397 PE=1 SV=1

Dextranase OS=Streptococcus salivarius OX=1304 GN=dex PE=3 SV=1

Dextranase OS=Streptococcus mutans serotype c (strain ATCC 700610 / UA159) OX=210007 GN=dexA PE=1 SV=2

Dextranase OS=Streptococcus downei OX=1317 GN=dex PE=1 SV=1