DOMON-like type 9 carbohydrate binding module. Family 9 carbohydrate-binding modules (CBM9) play a role in the microbial degradation of cellulose and hemicellulose (materials found in plants). The domain has previously been called cellulose-binding domain. The polysaccharide binding sites of CBMs with available 3D structure have been found to be either flat surfaces with interactions formed by predominantly aromatic residues (tryptophan and tyrosine), or extended shallow grooves. CBM9 domains found in this uncharacterized heterogeneous subfamily are often located at the C-terminus of longer proteins and may co-occur with various other domains.

Carbohydrate family 9 binding domain-like. CBM9_1 is a C-terminal domain on bacterial xylanase proteins, and it is tandemly repeated in a number of family-members. The CBM9 module binds to amorphous and crystalline cellulose and a range of soluble di- and monosaccharides as well as to cello- and xylo- oligomers of different degrees of polymerization. Comparison of the glucose and cellobiose complexes during crystallisation reveals surprising differences in binding of these two substrates by CBM9-2. Cellobiose was found to bind in a distinct orientation from glucose, while still maintaining optimal stacking and electrostatic interactions with the reducing end sugar.

DOMON-like type 9 carbohydrate binding module of xylanases. Family 9 carbohydrate-binding modules (CBM9) play a role in the microbial degradation of cellulose and hemicellulose (materials found in plants). The domain has previously been called cellulose-binding domain. The polysaccharide binding sites of CBMs with available 3D structure have been found to be either flat surfaces with interactions formed by predominantly aromatic residues (tryptophan and tyrosine), or extended shallow grooves. The CBM9 domain frequently occurs in tandem repeats; members found in this subfamily typically co-occur with glycosyl hydrolase family 10 domains and are annotated as endo-1,4-beta-xylanases. CBM9 from Thermotoga maritima xylanase 10A is reported to have specificity for polysaccharide reducing ends.

Non-viral sialidases. Sialidases or neuraminidases function to bind and hydrolyze terminal sialic acid residues from various glycoconjugates, they play vital roles in pathogenesis, bacterial nutrition and cellular interactions. They have a six-bladed, beta-propeller fold with the non-viral sialidases containing 2-5 Asp-box motifs (most commonly Ser/Thr-X-Asp-[X]-Gly-X-Thr- Trp/Phe). This CD includes eubacterial and eukaryotic sialidases.

Domon-like ligand-binding domains. DOMON-like domains can be found in all three kindgoms of life and are a diverse group of ligand binding domains that have been shown to interact with sugars and hemes. DOMON domains were initially thought to confer protein-protein interactions. They were subsequently found as a heme-binding motif in cellobiose dehydrogenase, an extracellular fungal oxidoreductase that degrades both lignin and cellulose, and in ethylbenzene dehydrogenase, an enzyme that aids in the anaerobic degradation of hydrocarbons. The domain interacts with sugars in the type 9 carbohydrate binding modules (CBM9), which are present in a variety of glycosyl hydrolases, and it can also be found at the N-terminus of sensor histidine kinases.

ChainA, Type 3a cellulose-binding domain protein [Caldicellulosiruptor lactoaceticus 6A]

Thestructure of Acidothermus cellulolyticus family 74 glycoside hydrolase [Acidothermus cellulolyticus 11B]

Crystalstructure of Paenibacillus graminis GH74 (PgGH74) [Paenibacillus graminis]

Crystalstructure of the catalytic domain from GH74 enzyme PoGH74 from Paenibacillus odorifer, D60A mutant in complex with XXLG and XGXXLG xyloglucan [Paenibacillus odorifer]

ChainA, BETA-1,4-XYLOGLUCAN HYDROLASE [Acetivibrio thermocellus],2CN2_B Chain B, BETA-1,4-XYLOGLUCAN HYDROLASE [Acetivibrio thermocellus],2CN2_C Chain C, BETA-1,4-XYLOGLUCAN HYDROLASE [Acetivibrio thermocellus],2CN2_D Chain D, BETA-1,4-XYLOGLUCAN HYDROLASE [Acetivibrio thermocellus]

Xyloglucanase OS=Paenibacillus sp. OX=58172 GN=xeg74 PE=1 SV=1

Xyloglucanase Xgh74A OS=Acetivibrio thermocellus (strain ATCC 27405 / DSM 1237 / JCM 9322 / NBRC 103400 / NCIMB 10682 / NRRL B-4536 / VPI 7372) OX=203119 GN=xghA PE=3 SV=1

Xyloglucanase Xgh74A OS=Acetivibrio thermocellus OX=1515 GN=xghA PE=1 SV=1

Oligoxyloglucan-reducing end-specific xyloglucanase OS=Emericella nidulans (strain FGSC A4 / ATCC 38163 / CBS 112.46 / NRRL 194 / M139) OX=227321 GN=xgcA PE=1 SV=1

Probable oligoxyloglucan-reducing end-specific xyloglucanase OS=Neosartorya fischeri (strain ATCC 1020 / DSM 3700 / CBS 544.65 / FGSC A1164 / JCM 1740 / NRRL 181 / WB 181) OX=331117 GN=xgcA PE=3 SV=1