7eee

<table><tr><td colspan='2'>[[7eee]] is a 1 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7EEE OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7EEE FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BMA:BETA-D-MANNOSE'>BMA</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene></td></tr>

<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Licheninase Licheninase], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.73 3.2.1.73] </span></td></tr>

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== Publication Abstract from PubMed ==

beta-1,3-1,4-Glucanases are a type of hydrolytic enzymes capable of catalyzing the strict cleavage of beta-1,4 glycosidic bonds adjacent to beta-1,3 linkages in beta-D-glucans and have exhibited great potential in food and feed industrials. In this study, a novel glycoside hydrolase (GH) family 12 beta-1,3-1,4-glucanase (CtGlu12A) from the thermophilic fungus Chaetomium sp. CQ31 was identified and biochemically characterized. CtGlu12A was most active at pH 7.5 and 65 degrees C, respectively, and exhibited a high specific activity of 999.9 U mg(-1) towards lichenin. It maintained more than 80% of its initial activity in a wide pH range of 5.0-11.0, and up to 60 degrees C after incubation at 55 degrees C for 60 min. Moreover, the crystal structures of CtGlu12A with gentiobiose and tetrasccharide were resolved. CtGlu12A had a beta-jellyroll fold, and performed retaining mechanism with two glutamic acids severing as the catalytic residues. In the complex structure, cellobiose molecule showed two binding modes, occupying subsites -2 to -1 and subsites + 1 to + 2, respectively. The concave cleft made mixed beta-1,3-1,4-glucan substrates maintain a bent conformation to fit into the active site. Overall, this study is not only helpful for the understanding of the substrate-binding model and catalytic mechanism of GH 12 beta-1,3-1,4-glucanases, but also provides a basis for further enzymatic engineering of beta-1,3-1,4-glucanases.

 

== References ==

[[Category: Jiang, Z Q]]

[[Category: Ma, J W]]

[[Category: Substrate binding]]