Laminarinase, member of the glycosyl hydrolase family 16. Laminarinase, also known as glucan endo-1,3-beta-D-glucosidase, is a glycosyl hydrolase family 16 member that hydrolyzes 1,3-beta-D-glucosidic linkages in 1,3-beta-D-glucans such as laminarins, curdlans, paramylons, and pachymans, with very limited action on mixed-link (1,3-1,4-)-beta-D-glucans.

glycosyl hydrolase family 16. The O-Glycosyl hydrolases are a widespread group of enzymes that hydrolyse the glycosidic bond between two or more carbohydrates, or between a carbohydrate and a non-carbohydrate moiety. A glycosyl hydrolase classification system based on sequence similarity has led to the definition of more than 95 different families inlcuding glycosyl hydrolase family 16. Family 16 includes lichenase, xyloglucan endotransglycosylase (XET), beta-agarase, kappa-carrageenase, endo-beta-1,3-glucanase, endo-beta-1,3-1,4-glucanase, and endo-beta-galactosidase, all of which have a conserved jelly roll fold with a deep active site channel harboring the catalytic residues.

Coelomic cytolytic factor, member of glycosyl hydrolase family 16. Subgroup of glucanases of unknown function that are related to beta-GRP (beta-1,3-glucan recognition protein), but contain active site residues. Beta-GRPs are one group of pattern recognition receptors (PRRs), also referred to as biosensor proteins, that complexes with pathogen-associated beta-1,3-glucans and then transduces signals necessary for activation of an appropriate innate immune response. Beta-GRPs are present in insects and lack all catalytic residues. This subgroup contains related proteins that still contain the active site and are widely distributed in eukaryotes. Their structures adopt a jelly roll fold with a deep active site channel harboring the catalytic residues, like those of other glycosyl hydrolase family 16 members.

Streptomyces laminarinase-like, member of glycosyl hydrolase family 16. Proteins similar to Streptomyces sioyaensis beta-1,3-glucanase (laminarinase) present in Actinomycetales as well as Peziomycotina. Laminarinases belong to glycosyl hydrolase family 16 and hydrolyze the glycosidic bond of the 1,3-beta-linked glucan, a major component of fungal and plant cell walls and the structural and storage polysaccharides (laminarin) of marine macro-algae. Members of the GH16 family have a conserved jelly roll fold with an active site channel.

Beta-agarase, member of glycosyl hydrolase family 16. Beta-agarase is a glycosyl hydrolase family 16 (GH16) member that hydrolyzes the internal beta-1,4-linkage of agarose, a hydrophilic polysaccharide found in the cell wall of Rhodophyceaea, marine red algae. Agarose is a linear chain of galactose units linked by alternating L-alpha-1,3- and D-beta-1,4-linkages that are additionally modified by a 3,6-anhydro-bridge. Agarose forms thermo-reversible gels that are widely used in the food industry or as a laboratory medium. While beta-agarases are also found in two other families derived from the sequence-based classification of glycosyl hydrolases (GH50, and GH86) the GH16 members are most abundant. This domain adopts a curved beta-sandwich conformation, with a tunnel-shaped active site cavity, referred to as a jellyroll fold.

Structureof Marine bacterial laminarinase [Aquimarina]

ChainA, GH16 family protein [uncultured bacterium]

Structureof Marine bacterial laminarinase mutant-E135A [Aquimarina],6JIA_A Marine bacterial laminarinase mutant E135A complex with laminaritetraose [Aquimarina sp.],6M6P_A Structure of Marine bacterial laminarinase mutant E135A in complex with 1,3-beta-cellotriosyl-glucose [Aquimarina sp.]

ChainA, GH16 family protein [uncultured bacterium],6XQG_A Chain A, GH16 family protein [uncultured bacterium],6XQH_A Chain A, GH16 family protein [uncultured bacterium],6XQL_A Chain A, GH16 family protein [uncultured bacterium],6XQM_A Chain A, GH16 family protein [uncultured bacterium]

Crystalstructure of the catalytic domain of the modular laminarinase ZgLamC mutant E142S [Zobellia galactanivorans],4CRQ_B Crystal structure of the catalytic domain of the modular laminarinase ZgLamC mutant E142S [Zobellia galactanivorans],4CTE_A Crystal structure of the catalytic domain of the modular laminarinase ZgLamC mutant E142S in complex with a thio-oligosaccharide [Zobellia galactanivorans],4CTE_B Crystal structure of the catalytic domain of the modular laminarinase ZgLamC mutant E142S in complex with a thio-oligosaccharide [Zobellia galactanivorans]

Keratan-sulfate endo-1,4-beta-galactosidase OS=Sphingobacterium multivorum OX=28454 PE=1 SV=1

Glucan endo-1,3-beta-glucosidase A1 OS=Niallia circulans OX=1397 GN=glcA PE=1 SV=1

Beta-glucanase OS=Rhodothermus marinus OX=29549 GN=bglA PE=1 SV=1

Glucan endo-1,3-beta-glucosidase OS=Cryptopygus antarcticus OX=187623 PE=1 SV=1

Endo-1,3-1,4-beta-glycanase ExsH OS=Rhizobium meliloti (strain 1021) OX=266834 GN=exsH PE=1 SV=1