View source for 7alg


==The RSLex - sulfonato-calix[8]arene complex, P3 form, acetate pH 4.0==
<StructureSection load='7alg' size='340' side='right'caption='[[7alg]], [[Resolution|resolution]] 1.45&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7alg]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Ralstonia_solanacearum Ralstonia solanacearum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7ALG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7ALG 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]] 1.452&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BDF:BETA-D-FRUCTOPYRANOSE'>BDF</scene>, <scene name='pdbligand=EVB:sulfonato-calix[8]arene'>EVB</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</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=7alg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7alg OCA], [https://pdbe.org/7alg PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7alg RCSB], [https://www.ebi.ac.uk/pdbsum/7alg PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7alg ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/A0A0S4TLR1_RALSL A0A0S4TLR1_RALSL] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Precisely defined protein aggregates, as exemplified by crystals, have applications in functional materials. Consequently, engineered protein assembly is a rapidly growing field. Anionic calix[n]arenes are useful scaffolds that can mold to cationic proteins and induce oligomerization and assembly. Here, we describe protein-calixarene composites obtained via cocrystallization of commercially available sulfonato-calix[8]arene (sclx8) with the symmetric and "neutral" protein RSL. Cocrystallization occurred across a wide range of conditions and protein charge states, from pH 2.2-9.5, resulting in three crystal forms. Cationization of the protein surface at pH approximately 4 drives calixarene complexation and yielded two types of porous frameworks with pore diameters &gt;3 nm. Both types of framework provide evidence of protein encapsulation by the calixarene. Calixarene-masked proteins act as nodes within the frameworks, displaying octahedral-type coordination in one case. The other framework formed millimeter-scale crystals within hours, without the need for precipitants or specialized equipment. NMR experiments revealed macrocycle-modulated side chain pKa values and suggested a mechanism for pH-triggered assembly. The same low pH framework was generated at high pH with a permanently cationic arginine-enriched RSL variant. Finally, in addition to protein framework fabrication, sclx8 enables de novo structure determination.

Facile Fabrication of Protein-Macrocycle Frameworks.,Ramberg KO, Engilberge S, Skorek T, Crowley PB J Am Chem Soc. 2021 Feb 3;143(4):1896-1907. doi: 10.1021/jacs.0c10697. Epub 2021 , Jan 20. PMID:33470808<ref>PMID:33470808</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 7alg" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Ralstonia solanacearum]]
[[Category: Crowley PB]]
[[Category: Engilberge S]]
[[Category: Ramberg K]]