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1lmm

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Revision as of 04:53, 11 September 2015

Solution Structure of Psmalmotoxin 1, the First Characterized Specific Blocker of ASIC1a NA+ channel

Structural highlights

1lmm is a 1 chain structure with sequence from Psaca. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance.
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum

Function

[TXP1_PSACA] Potently and selectively blocks the acid-sensing ion channel ASIC1a/ACCN2. The blockade is rapid and reversible. Psalmotoxin 1 loses its capacity to block ASIC1a/ACCN2 as soon as this subunit is associated with another member of the family (ASIC2a/ACCN1 or ASIC3/ACCN3). The toxin can distinguish between the two ASIC1/ACCN2 splice variants ASIC1a/ACCN2 and ASIC1b/ACCN2.^[1]

Publication Abstract from PubMed

Acid-sensing ion channels (ASICs) are thought to be important ion channels, particularly for the perception of pain. Some of them may also contribute to synaptic plasticity, learning, and memory. Psalmotoxin 1 (PcTx1), the first potent and specific blocker of the ASIC1a proton-sensing channel, has been successfully expressed in the Drosophila melanogaster S2 cell recombinant expression system used here for the first time to produce a spider toxin. The recombinant toxin was identical in all respects to the native peptide, and its three-dimensional structure in solution was determined by means of (1)H 2D NMR spectroscopy. Surface characteristics of PcTx1 provide insights on key structural elements involved in the binding of PcTx1 to ASIC1a channels. They appear to be localized in the beta-sheet and the beta-turn linking the strands, as indicated by electrostatic anisotropy calculations, surface charge distribution, and the presence of residues known to be implicated in channel recognition by other inhibitor cystine knot (ICK) toxins.

Recombinant production and solution structure of PcTx1, the specific peptide inhibitor of ASIC1a proton-gated cation channels.,Escoubas P, Bernard C, Lambeau G, Lazdunski M, Darbon H Protein Sci. 2003 Jul;12(7):1332-43. PMID:12824480^[2]

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

References

↑ Escoubas P, De Weille JR, Lecoq A, Diochot S, Waldmann R, Champigny G, Moinier D, Menez A, Lazdunski M. Isolation of a tarantula toxin specific for a class of proton-gated Na+ channels. J Biol Chem. 2000 Aug 18;275(33):25116-21. PMID:10829030 doi:http://dx.doi.org/10.1074/jbc.M003643200
↑ Escoubas P, Bernard C, Lambeau G, Lazdunski M, Darbon H. Recombinant production and solution structure of PcTx1, the specific peptide inhibitor of ASIC1a proton-gated cation channels. Protein Sci. 2003 Jul;12(7):1332-43. PMID:12824480 doi:10.1110/ps.0307003

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/1lmm"

@@ Line 2: / Line 2: @@
 <StructureSection load='1lmm' size='340' side='right' caption='[[1lmm]], [[NMR_Ensembles_of_Models | 20 NMR models]]' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[1lmm]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Psalmopoeus_cambridgei Psalmopoeus cambridgei]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1LMM OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1LMM FirstGlance]. <br>
+<table><tr><td colspan='2'>[[1lmm]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Psaca Psaca]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1LMM OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1LMM 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=1lmm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1lmm OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1lmm RCSB], [http://www.ebi.ac.uk/pdbsum/1lmm 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=1lmm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1lmm OCA], [http://pdbe.org/1lmm PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1lmm RCSB], [http://www.ebi.ac.uk/pdbsum/1lmm PDBsum]</span></td></tr>
 </table>
 == Function ==
@@ Line 15: / Line 15: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 1lmm" style="background-color:#fffaf0;"></div>
 == References ==
 <references/>
 __TOC__
 </StructureSection>
-[[Category: Psalmopoeus cambridgei]]
+[[Category: Psaca]]
 [[Category: Bernard, C]]
 [[Category: Darbon, H]]

1lmm

From Proteopedia

Revision as of 04:53, 11 September 2015

Solution Structure of Psmalmotoxin 1, the First Characterized Specific Blocker of ASIC1a NA+ channel

Structural highlights

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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