View source for 6pin


==NMR Solution structure of cyclic tachyplesin I==
<StructureSection load='6pin' size='340' side='right'caption='[[6pin]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6pin]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Tachypleus_tridentatus Tachypleus tridentatus]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6PIN OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6PIN FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR, 20 models</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=6pin FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6pin OCA], [https://pdbe.org/6pin PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6pin RCSB], [https://www.ebi.ac.uk/pdbsum/6pin PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6pin ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/TAC1_TACTR TAC1_TACTR] Significantly inhibits the growth of Gram-negative and Gram-positive bacteria.
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== Publication Abstract from PubMed ==
Tachyplesin I, II and III are host defense peptides from horseshoe crab species with antimicrobial and anticancer activities. They have an amphipathic beta-hairpin structure, are highly positively-charged and differ by only one or two amino acid residues. In this study, we compared the structure and activity of the three tachyplesin peptides alongside their backbone cyclized analogues. We assessed the peptide structures using nuclear magnetic resonance (NMR) spectroscopy, then compared the activity against bacteria (both in the planktonic and biofilm forms) and a panel of cancerous cells. The importance of peptide-lipid interactions was examined using surface plasmon resonance and fluorescence spectroscopy methodologies. Our studies showed that tachyplesin peptides and their cyclic analogues were most potent against Gram-negative bacteria and melanoma cell lines, and showed a preference for binding to negatively-charged lipid membranes. Backbone cyclization did not improve potency, but improved peptide stability in human serum and reduced toxicity toward human red blood cells. Peptide-lipid binding affinity, orientation within the membrane, and ability to disrupt lipid bilayers differed between the cyclized peptide and the parent counterpart. We show that tachyplesin peptides and cyclized analogues have similarly potent antimicrobial and anticancer properties, but that backbone cyclization improves their stability and therapeutic potential.

Characterization of Tachyplesin Peptides and Their Cyclized Analogues to Improve Antimicrobial and Anticancer Properties.,Vernen F, Harvey PJ, Dias SA, Veiga AS, Huang YH, Craik DJ, Lawrence N, Troeira Henriques S Int J Mol Sci. 2019 Aug 26;20(17):4184. doi: 10.3390/ijms20174184. PMID:31455019<ref>PMID:31455019</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6pin" style="background-color:#fffaf0;"></div>

==See Also==
*[[Tachyplesin|Tachyplesin]]
*[[Transcription initiation factors 3D structures|Transcription initiation factors 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Tachypleus tridentatus]]
[[Category: Harvey PJ]]
[[Category: Troeira Henriques S]]
[[Category: Vernen F]]