View source for 5yrk


==Crystal structure of PPL3C==
<StructureSection load='5yrk' size='340' side='right'caption='[[5yrk]], [[Resolution|resolution]] 1.35&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5yrk]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Pteria_penguin Pteria penguin]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5YRK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5YRK 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]] 1.35&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=PCA:PYROGLUTAMIC+ACID'>PCA</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=5yrk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5yrk OCA], [https://pdbe.org/5yrk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5yrk RCSB], [https://www.ebi.ac.uk/pdbsum/5yrk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5yrk ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/A0A2Z5V8U8_PTEPN A0A2Z5V8U8_PTEPN] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The nacreous layer of pearl oysters is one of the major biominerals of commercial and industrial interest. Jacalin-related lectins, including PPL3 isoforms, are known to regulate biomineralization of the Pteria penguin pearl shell, although the molecular mechanisms are largely unknown. The PPL3 crystal structures were determined partly by utilizing microgravity environments for 3 isoforms, namely, PPL3A, PPL3B, and PPL3C. The structures revealed a tail-to-tail dimer structure established by forming a unique inter-subunit disulfide bond at C-termini. The N-terminal residues were found in pyroglutamate form, and this was partly explained by the post-translational modification of PPL3 isoforms implied from the discrepancy between amino acid and gene sequences. The complex structures with trehalose and isomaltose indicated that the novel specificity originated from the unique alpha-helix of PPL3 isoforms. Docking simulations of PPL3B to various calcite crystal faces suggested the edge of a beta-sheet and the carbohydrate-binding site rich in charged residues were the interface to the biomineral, and implied that the isoforms differed in calcite interactions.

Structures of jacalin-related lectin PPL3 regulating pearl shell biomineralization.,Nakae S, Shionyu M, Ogawa T, Shirai T Proteins. 2018 Jun;86(6):644-653. doi: 10.1002/prot.25491. Epub 2018 Mar 23. PMID:29524263<ref>PMID:29524263</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5yrk" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Pteria penguin]]
[[Category: Nakae S]]
[[Category: Ogawa T]]
[[Category: Shionyu M]]
[[Category: Shirai T]]