Glycoside hydrolase 97. This domain is the catalytic region of the bacterial glycosyl-hydrolase family 97. This central part of the GH97 family protein sequences represents a typical and complete (beta/alpha)8-barrel or catalytic TIM-barrel type domain. The N- and C-terminal parts of the sequences, mainly consisting of beta-strands, form two additional non-catalytic domains. In all known glycosidases with the (beta-alpha)8-barrel fold, the amino acid residues at the active site are located on the C-termini of the beta-strands.

Glycosyl-hydrolase 97 N-terminal. This N-terminal domain of glycosyl-hydrolase-97 contributes part of the active site pocket. It is also important for contact with the catalytic and C-terminal domains of the whole.

Glycosyl-hydrolase 97 C-terminal, oligomerization. Glycosyl-hydrolase-97 is made up of three tightly linked and highly conserved globular domains. The C-terminal domain is found to be necessary for oligomerization of the whole molecule in order to create the active-site pocket and the Ca++-binding site.

C2 domain present in Phosphoinositide-specific phospholipases C (PLC). PLCs are involved in the hydrolysis of phosphatidylinositol-4,5-bisphosphate (PIP2) to d-myo-inositol-1,4,5-trisphosphate (1,4,5-IP3) and sn-1,2-diacylglycerol (DAG). 1,4,5-IP3 and DAG are second messengers in eukaryotic signal transduction cascades. PLC is composed of a N-terminal PH domain followed by a series of EF hands, a catalytic TIM barrel and a C-terminal C2 domain. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. Members here have a type-II topology.

CrystalStructure Analysis of SusB [Bacteroides thetaiotaomicron VPI-5482],2D73_B Crystal Structure Analysis of SusB [Bacteroides thetaiotaomicron VPI-5482],2ZQ0_A Crystal structure of SusB complexed with acarbose [Bacteroides thetaiotaomicron],2ZQ0_B Crystal structure of SusB complexed with acarbose [Bacteroides thetaiotaomicron]

Nativestructure of a family 97 alpha-glucosidase from Bacteroides thetaiotaomicron [Bacteroides thetaiotaomicron VPI-5482],2JKA_B Native structure of a family 97 alpha-glucosidase from Bacteroides thetaiotaomicron [Bacteroides thetaiotaomicron VPI-5482],2JKE_A Structure of a family 97 alpha-glucosidase from Bacteroides thetaiotaomicron in complex with deoxynojirimycin [Bacteroides thetaiotaomicron VPI-5482],2JKE_B Structure of a family 97 alpha-glucosidase from Bacteroides thetaiotaomicron in complex with deoxynojirimycin [Bacteroides thetaiotaomicron VPI-5482],2JKP_A Structure of a family 97 alpha-glucosidase from Bacteroides thetaiotaomicron in complex with castanospermine [Bacteroides thetaiotaomicron VPI-5482],2JKP_B Structure of a family 97 alpha-glucosidase from Bacteroides thetaiotaomicron in complex with castanospermine [Bacteroides thetaiotaomicron VPI-5482]

Catalyticrole of the calcium ion in GH97 inverting glycoside hydrolase [Bacteroides thetaiotaomicron],3WFA_B Catalytic role of the calcium ion in GH97 inverting glycoside hydrolase [Bacteroides thetaiotaomicron]

AGlycoside Hydrolase Family 97 enzyme from Pseudoalteromonas sp. strain K8 [Pseudoalteromonas sp. K8],5HQA_A A Glycoside Hydrolase Family 97 enzyme in complex with Acarbose from Pseudoalteromonas sp. strain K8 [Pseudoalteromonas sp. K8]

AGlycoside Hydrolase Family 97 enzyme R171K variant from Pseudoalteromonas sp. strain K8 [Pseudoalteromonas sp. K8]

Glucan 1,4-alpha-glucosidase SusB OS=Bacteroides thetaiotaomicron (strain ATCC 29148 / DSM 2079 / JCM 5827 / CCUG 10774 / NCTC 10582 / VPI-5482 / E50) OX=226186 GN=susB PE=1 SV=1

Retaining alpha-galactosidase OS=Bacteroides thetaiotaomicron (strain ATCC 29148 / DSM 2079 / JCM 5827 / CCUG 10774 / NCTC 10582 / VPI-5482 / E50) OX=226186 GN=BT_1871 PE=1 SV=1

Probable retaining alpha-galactosidase OS=Streptomyces bingchenggensis (strain BCW-1) OX=749414 GN=SBI_01652 PE=3 SV=1