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[[Image:2dt3.gif|left|200px]]
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{{STRUCTURE_2dt3|  PDB=2dt3  |  SCENE=  }}
'''Crystal structure of the complex formed between goat signalling protein and the hexasaccharide at 2.28 A resolution'''


==Crystal structure of the complex formed between goat signalling protein and the hexasaccharide at 2.28 A resolution==
<StructureSection load='2dt3' size='340' side='right'caption='[[2dt3]], [[Resolution|resolution]] 2.28&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2dt3]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Capra_hircus Capra hircus]. This structure supersedes the now removed PDB entries [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=2b2z 2b2z] and [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=1zu6 1zu6]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2DT3 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2DT3 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]] 2.28&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MAN:ALPHA-D-MANNOSE'>MAN</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=2dt3 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2dt3 OCA], [https://pdbe.org/2dt3 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2dt3 RCSB], [https://www.ebi.ac.uk/pdbsum/2dt3 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2dt3 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/CH3L1_CAPHI CH3L1_CAPHI] Carbohydrate-binding lectin with a preference for chitin. May play a role in defense against pathogens, or in tissue remodeling. May play an important role in the capacity of cells to respond to and cope with changes in their environment.
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/dt/2dt3_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=2dt3 ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
A 40 kDa glycoprotein (SPG-40) secreted during involution works as a protective signalling factor through its binding to viable cells. The crystal structure of the native protein has been determined at 2.3 A resolution. This is the first report on the carbohydrate-binding properties of SPG-40; the structure determinations of the complexes of SPG-40 with four oligosaccharides of different lengths at resolutions ranging from 2.2 to 2.8 A are described. Carbohydrate-binding studies with N-acetylglucosamines (GlcNAc(n), n = 3-6) using fluorescence spectroscopy revealed poor binding effects with GlcNAc(3) and GlcNAc(4), while GlcNAc(5) and GlcNAc(6) bound to SPG-40 with considerable strength; the dissociation constants (K(d)) were estimated to be 260 +/- 3 and 18 +/- 4 microM, respectively. SPG-40 was cocrystallized with GlcNAc(3), GlcNAc(4), GlcNAc(5) and GlcNAc(6). The overall structure of native SPG-40 was essentially similar to that reported previously at low resolution. The structures of its complexes with GlcNAc(3), GlcNAc(4), GlcNAc(5) and GlcNAc(6) revealed the positions of these oligosaccharides in the carbohydrate-binding groove and provided insights into the mechanism of binding of oligosaccharides to SPG-40, indicating that the preferred subsites in the carbohydrate-binding groove of SPG-40 were from -4 to -2. The structure of the protein remained unperturbed upon binding of GlcNAc(3) and GlcNAc(4), but the structure changed significantly upon binding of GlcNAc(5) and GlcNAc(6). Significant conformational variations were observed in the sugar-binding groove: Trp78 partially flipped out of the barrel in GlcNAc(5), while in the GlcNAc(6) complex a completely flipped-out Trp78 was observed along with several other conformational changes, including those of Asp186 and Arg242. Such changes upon binding to carbohydrates have not previously been observed in chitin-hydrolyzing chitinases and reflect less favourable binding of carbohydrates to SPG-40. As this appears to essentially be a binding protein, this loss of binding affinity might be compensated by other intermolecular interactions such as protein-protein interactions and also by the binding of its own glycan chain.


==Overview==
Carbohydrate-binding properties of goat secretory glycoprotein (SPG-40) and its functional implications: structures of the native glycoprotein and its four complexes with chitin-like oligosaccharides.,Kumar J, Ethayathulla AS, Srivastava DB, Singh N, Sharma S, Kaur P, Srinivasan A, Singh TP Acta Crystallogr D Biol Crystallogr. 2007 Apr;63(Pt 4):437-46. Epub 2007, Mar 16. PMID:17372347<ref>PMID:17372347</ref>
A 40 kDa glycoprotein (SPG-40) secreted during involution works as a protective signalling factor through its binding to viable cells. The crystal structure of the native protein has been determined at 2.3 A resolution. This is the first report on the carbohydrate-binding properties of SPG-40; the structure determinations of the complexes of SPG-40 with four oligosaccharides of different lengths at resolutions ranging from 2.2 to 2.8 A are described. Carbohydrate-binding studies with N-acetylglucosamines (GlcNAc(n), n = 3-6) using fluorescence spectroscopy revealed poor binding effects with GlcNAc(3) and GlcNAc(4), while GlcNAc(5) and GlcNAc(6) bound to SPG-40 with considerable strength; the dissociation constants (K(d)) were estimated to be 260 +/- 3 and 18 +/- 4 microM, respectively. SPG-40 was cocrystallized with GlcNAc(3), GlcNAc(4), GlcNAc(5) and GlcNAc(6). The overall structure of native SPG-40 was essentially similar to that reported previously at low resolution. The structures of its complexes with GlcNAc(3), GlcNAc(4), GlcNAc(5) and GlcNAc(6) revealed the positions of these oligosaccharides in the carbohydrate-binding groove and provided insights into the mechanism of binding of oligosaccharides to SPG-40, indicating that the preferred subsites in the carbohydrate-binding groove of SPG-40 were from -4 to -2. The structure of the protein remained unperturbed upon binding of GlcNAc(3) and GlcNAc(4), but the structure changed significantly upon binding of GlcNAc(5) and GlcNAc(6). Significant conformational variations were observed in the sugar-binding groove: Trp78 partially flipped out of the barrel in GlcNAc(5), while in the GlcNAc(6) complex a completely flipped-out Trp78 was observed along with several other conformational changes, including those of Asp186 and Arg242. Such changes upon binding to carbohydrates have not previously been observed in chitin-hydrolyzing chitinases and reflect less favourable binding of carbohydrates to SPG-40. As this appears to essentially be a binding protein, this loss of binding affinity might be compensated by other intermolecular interactions such as protein-protein interactions and also by the binding of its own glycan chain.


==About this Structure==
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
2DT3 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Capra_hircus Capra hircus]. This structure supersedes the now removed PDB entries  and [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=1zu6 1zu6]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2DT3 OCA].
</div>
<div class="pdbe-citations 2dt3" style="background-color:#fffaf0;"></div>


==Reference==
==See Also==
Carbohydrate-binding properties of goat secretory glycoprotein (SPG-40) and its functional implications: structures of the native glycoprotein and its four complexes with chitin-like oligosaccharides., Kumar J, Ethayathulla AS, Srivastava DB, Singh N, Sharma S, Kaur P, Srinivasan A, Singh TP, Acta Crystallogr D Biol Crystallogr. 2007 Apr;63(Pt 4):437-46. Epub 2007, Mar 16. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/17372347 17372347]
*[[Chitinase-3-like protein 3D structures|Chitinase-3-like protein 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Capra hircus]]
[[Category: Capra hircus]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: Ethayathulla, A S.]]
[[Category: Ethayathulla AS]]
[[Category: Kumar, J.]]
[[Category: Kumar J]]
[[Category: Sharma, S.]]
[[Category: Sharma S]]
[[Category: Singh, N.]]
[[Category: Singh N]]
[[Category: Singh, T P.]]
[[Category: Singh TP]]
[[Category: Srivastava, D B.]]
[[Category: Srivastava DB]]
[[Category: Involution]]
[[Category: Mammary gland]]
[[Category: Signalling]]
[[Category: Tim barrel]]
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