View source for 6mcd


==Crystal Structure of tris-thiolate Pb(II) complex with adjacent water in a de novo Three Stranded Coiled Coil Peptide==
<StructureSection load='6mcd' size='340' side='right'caption='[[6mcd]], [[Resolution|resolution]] 1.50&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6mcd]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Synthetic_construct Synthetic construct]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6MCD OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6MCD 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]] 1.5&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACE:ACETYL+GROUP'>ACE</scene>, <scene name='pdbligand=NH2:AMINO+GROUP'>NH2</scene>, <scene name='pdbligand=PB:LEAD+(II)+ION'>PB</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</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=6mcd FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6mcd OCA], [https://pdbe.org/6mcd PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6mcd RCSB], [https://www.ebi.ac.uk/pdbsum/6mcd PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6mcd ProSAT]</span></td></tr>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Three-stranded coiled coils are peptide structures constructed from amphipathic heptad repeats. Here we show that it is possible to form pure heterotrimeric three-stranded coiled coils by combining three distinct characteristics: (1) a cysteine sulfur layer for metal coordination, (2) a thiophilic, trigonal pyramidal metalloid (Pb(II)) that binds to these sulfurs and (3) an adjacent layer of reduced steric bulk generating a cavity where water can hydrogen bond to the cysteine sulfur atoms. Cysteine substitution in an a site yields Pb(II)A2B heterotrimers, while d sites provide pure Pb(II)C2D or Pb(II)CD2 scaffolds. Altering the metal from Pb(II) to Hg(II) or shifting the relative position of the sterically less demanding layer removes heterotrimer specificity. Because only two of the eight or ten hydrophobic layers are perturbed, catalytic sites can be introduced at other regions of the scaffold. A Zn(II)(histidine)3(H2O) centre can be incorporated at a remote location without perturbing the heterotrimer selectivity, suggesting a unique strategy to prepare dissymmetric catalytic sites within self-assembling de novo-designed proteins.

Heteromeric three-stranded coiled coils designed using a Pb(II)(Cys)3 template mediated strategy.,Tolbert AE, Ervin CS, Ruckthong L, Paul TJ, Jayasinghe-Arachchige VM, Neupane KP, Stuckey JA, Prabhakar R, Pecoraro VL Nat Chem. 2020 Mar 2. pii: 10.1038/s41557-020-0423-6. doi:, 10.1038/s41557-020-0423-6. PMID:32123337<ref>PMID:32123337</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6mcd" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Synthetic construct]]
[[Category: Pecoraro VL]]
[[Category: Ruckthong L]]
[[Category: Stuckey JA]]
[[Category: Tolbert AE]]