This old version of Proteopedia is provided for student assignments while the new version is undergoing repairs. Content and edits done in this old version of Proteopedia after March 1, 2026 will eventually be lost when it is retired in about June of 2026.

Apply for new accounts at the new Proteopedia. Your logins will work in both the old and new versions.

4ttl

From Proteopedia

(Difference between revisions)

Jump to: navigation, search

Revision as of 06:23, 26 July 2016

Racemic structure of cyclic Vc1.1 (cVc1.1-1)

Structural highlights

4ttl is a 1 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[CA1A_CONVC] Alpha-conotoxins act on postsynaptic membranes, they bind to the nicotinic acetylcholine receptors (nAChR) and thus inhibit them. This synthetic peptide (produced without hydroxyproline, nor 4-carboxyglutamate) is a neuronal nAChR antagonist that acts as a powerful analgesic. It blocks nAChRs composed of alpha-3 or -5/beta-2 (IC(50)=7.2 uM), alpha-3/beta-2 (IC(50)=7.3 uM), alpha-3/beta-4 (IC(50)=4.2 uM), alpha-3 or -5/beta-4 (IC(50)<30 uM), alpha-4/beta-2 (IC(50)<30 uM), alpha-4/beta-4 (IC(50)<30 uM) and alpha/beta/gamma/delta (IC(50)<30 uM) subunits.^[1] ^[2]

Publication Abstract from PubMed

Cyclic disulfide-rich peptides have exceptional stability and are promising frameworks for drug design. We were interested in obtaining X-ray structures of these peptides to assist in drug design applications, but disulfide-rich peptides can be notoriously difficult to crystallize. To overcome this limitation, we chemically synthesized the L- and D-forms of three prototypic cyclic disulfide-rich peptides: SFTI-1 (14-mer with one disulfide bond), cVc1.1 (22-mer with two disulfide bonds), and kB1 (29-mer with three disulfide bonds) for racemic crystallization studies. Facile crystal formation occurred from a racemic mixture of each peptide, giving structures solved at resolutions from 1.25 A to 1.9 A. Additionally, we obtained the quasi-racemic structures of two mutants of kB1, [G6A]kB1, and [V25A]kB1, which were solved at a resolution of 1.25 A and 2.3 A, respectively. The racemic crystallography approach appears to have broad utility in the structural biology of cyclic peptides.

Racemic and Quasi-Racemic X-ray Structures of Cyclic Disulfide-Rich Peptide Drug Scaffolds.,Wang CK, King GJ, Northfield SE, Ojeda PG, Craik DJ Angew Chem Int Ed Engl. 2014 Aug 28. doi: 10.1002/anie.201406563. PMID:25168664^[3]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Sandall DW, Satkunanathan N, Keays DA, Polidano MA, Liping X, Pham V, Down JG, Khalil Z, Livett BG, Gayler KR. A novel alpha-conotoxin identified by gene sequencing is active in suppressing the vascular response to selective stimulation of sensory nerves in vivo. Biochemistry. 2003 Jun 10;42(22):6904-11. PMID:12779345 doi:http://dx.doi.org/10.1021/bi034043e
↑ Lang PM, Burgstahler R, Haberberger RV, Sippel W, Grafe P. A conus peptide blocks nicotinic receptors of unmyelinated axons in human nerves. Neuroreport. 2005 Apr 4;16(5):479-83. PMID:15770155
↑ Wang CK, King GJ, Northfield SE, Ojeda PG, Craik DJ. Racemic and Quasi-Racemic X-ray Structures of Cyclic Disulfide-Rich Peptide Drug Scaffolds. Angew Chem Int Ed Engl. 2014 Aug 28. doi: 10.1002/anie.201406563. PMID:25168664 doi:http://dx.doi.org/10.1002/anie.201406563

1 Structural highlights
2 Function
3 Publication Abstract from PubMed
4 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/4ttl"

@@ Line 1: / Line 1: @@
 ==Racemic structure of cyclic Vc1.1 (cVc1.1-1)==
 <StructureSection load='4ttl' size='340' side='right' caption='[[4ttl]], [[Resolution|resolution]] 1.70&Aring;' scene=''>
 == Structural highlights ==
 <table><tr><td colspan='2'>[[4ttl]] is a 1 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4TTL OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4TTL FirstGlance]. <br>
-</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4ttl FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4ttl OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4ttl RCSB], [http://www.ebi.ac.uk/pdbsum/4ttl PDBsum]</span></td></tr>
+</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4ttl FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4ttl OCA], [http://pdbe.org/4ttl PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4ttl RCSB], [http://www.ebi.ac.uk/pdbsum/4ttl PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4ttl ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 15: / Line 16: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 4ttl" style="background-color:#fffaf0;"></div>
 == References ==
 <references/>

4ttl

From Proteopedia

Revision as of 06:23, 26 July 2016

Racemic structure of cyclic Vc1.1 (cVc1.1-1)

Structural highlights

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

Personal tools

Navigation

Search

Toolbox