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4ttl

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Revision as of 13:57, 10 May 2019

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=''>
+<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>
@@ Line 21: / Line 21: @@
 __TOC__
 </StructureSection>
+[[Category: Large Structures]]
 [[Category: Craik, D J]]
 [[Category: King, G J]]

4ttl

From Proteopedia

Revision as of 13:57, 10 May 2019

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?)

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