View source for 9lhr


==Crystal structure of Ice binding protein from Candidatus Cryosericum odellii SMC5==
<StructureSection load='9lhr' size='340' side='right'caption='[[9lhr]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[9lhr]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Candidatus_Cryosericum_odellii Candidatus Cryosericum odellii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=9LHR OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=9LHR 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]] 1.8&#8491;</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=9lhr FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=9lhr OCA], [https://pdbe.org/9lhr PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=9lhr RCSB], [https://www.ebi.ac.uk/pdbsum/9lhr PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=9lhr ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/A0A398D577_9BACT A0A398D577_9BACT] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Protein purification is essential for the isolation of specific proteins from mixtures. Conventional affinity tags have advanced recombinant protein purification. However, their reliance on costly resins and complex procedures often limits scalability and affordability. In this study, we identified three ice-binding domains (CoIBD1, CoIBD2, and CoIBD3) in Candidatus Cryosericum odellii SMC5 to evaluate their potential as protein purification tags. These domains exhibited hyperactive ice-binding properties, including high thermal hysteresis and ice recrystallization inhibition activities; additionally, they bound to multiple ice planes, enabling efficient attachment to ice surfaces. Through sequence and structural analyses, we engineered an enhanced variant that retained these ice-binding traits while achieving improved thermal and chemical stability: eCoIBD1. We then used eCoIBD1 as a fusion tag to develop the Ice Affinity Purification (IAP) system and evaluated its performance with GFP as a model protein. The IAP system achieved 87 % purity after two purification rounds, recovering 29 % of the initial protein from the crude extract. Consistent performance was observed in the presence of additives such as dithiothreitol and glycerol. The IAP system provides a cost-effective, environmentally friendly alternative to traditional methods by leveraging ice as a renewable binding medium, thereby eliminating the need for expensive resins or regeneration steps.

Ice affinity purification system for recombinant proteins using a DUF3494 ice-binding protein.,Hoang T, Nguyen DL, Kim B, Choi W, Cho SM, Kim HW, Han SJ, Kim K, Lee JH, Do H Int J Biol Macromol. 2025 Jun;315(Pt 1):144378. doi: , 10.1016/j.ijbiomac.2025.144378. Epub 2025 May 19. PMID:40398755<ref>PMID:40398755</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 9lhr" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Candidatus Cryosericum odellii]]
[[Category: Large Structures]]
[[Category: Do H]]
[[Category: Hoang T]]