View source for 4b16


==crystal structure of tamarind chitinase like lectin (TCLL) complexed with N-acetyl glucosamine (GlcNAc)==
<StructureSection load='4b16' size='340' side='right'caption='[[4b16]], [[Resolution|resolution]] 1.61&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4b16]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Tamarindus_indica Tamarindus indica]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4B16 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4B16 FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.61&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=MPD:(4S)-2-METHYL-2,4-PENTANEDIOL'>MPD</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=4b16 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4b16 OCA], [https://pdbe.org/4b16 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4b16 RCSB], [https://www.ebi.ac.uk/pdbsum/4b16 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4b16 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/S4S1V9_TAMIN S4S1V9_TAMIN] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The glycosyl hydrolase 18 (GH18) family consists of active chitinases as well as chitinase like lectins/proteins (CLPs). The CLPs share significant sequence and structural similarities with active chitinases, however, do not display chitinase activity. Some of these proteins are reported to have specific functions and carbohydrate binding property. In the present study, we report a novel chitinase like lectin (TCLL) from Tamarindus indica. The crystal structures of native TCLL and its complex with N-acetyl glucosamine were determined. Similar to the other CLPs of the GH18 members, TCLL lacks chitinase activity due to mutations of key active site residues. Comparison of TCLL with chitinases and other chitin binding CLPs shows that TCLL has substitution of some chitin binding site residues and more open binding cleft due to major differences in the loop region. Interestingly, the biochemical studies suggest that TCLL is an N-acetyl glucosamine specific chi-lectin, which is further confirmed by the complex structure of TCLL with N-acetyl glucosamine complex. TCLL has two distinct N-acetyl glucosamine binding sites S1 and S2 that contain similar polar residues, although interaction pattern with N-acetyl glucosamine varies extensively among them. Moreover, TCLL structure depicts that how plants utilize existing structural scaffolds ingenuously to attain new functions. To date, this is the first structural investigation of a chi-lectin from plants that explore novel carbohydrate binding sites other than chitin binding groove observed in GH18 family members. Consequently, TCLL structure confers evidence for evolutionary link of lectins with chitinases.

Structural Investigation of a Novel N-Acetyl Glucosamine Binding Chi-Lectin Which Reveals Evolutionary Relationship with Class III Chitinases.,Patil DN, Datta M, Dev A, Dhindwal S, Singh N, Dasauni P, Kundu S, Sharma AK, Tomar S, Kumar P PLoS One. 2013 May 23;8(5):e63779. doi: 10.1371/journal.pone.0063779. Print 2013. PMID:23717482<ref>PMID:23717482</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4b16" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Large Structures]]
[[Category: Tamarindus indica]]
[[Category: Kumar P]]
[[Category: Patil DN]]