1q43

From Proteopedia

(Difference between revisions)

Revision as of 08:33, 24 February 2018

HCN2I 443-640 in the presence of cAMP, selenomethionine derivative

Structural highlights

1q43 is a 2 chain structure with sequence from Lk3 transgenic mice. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:
NonStd Res:
Related:	1q3e, 1q5o
Gene:	HCN2, BCNG2 OR HAC1 (LK3 transgenic mice)
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[HCN2_MOUSE] Hyperpolarization-activated ion channel exhibiting weak selectivity for potassium over sodium ions. Contributes to the native pacemaker currents in heart (If) and in neurons (Ih). Can also transport ammonium in the distal nephron. Produces a large instantaneous current. Activated by cAMP. Modulated by intracellular chloride ions and pH; acidic pH shifts the activation to more negative voltages.^[1]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

The family of hyperpolarization-activated, cyclic nucleotide-modulated (HCN) channels are crucial for a range of electrical signalling, including cardiac and neuronal pacemaker activity, setting resting membrane electrical properties and dendritic integration. These nonselective cation channels, underlying the I(f), I(h) and I(q) currents of heart and nerve cells, are activated by membrane hyperpolarization and modulated by the binding of cyclic nucleotides such as cAMP and cGMP. The cAMP-mediated enhancement of channel activity is largely responsible for the increase in heart rate caused by beta-adrenergic agonists. Here we have investigated the mechanism underlying this modulation by studying a carboxy-terminal fragment of HCN2 containing the cyclic nucleotide-binding domain (CNBD) and the C-linker region that connects the CNBD to the pore. X-ray crystallographic structures of this C-terminal fragment bound to cAMP or cGMP, together with equilibrium sedimentation analysis, identify a tetramerization domain and the mechanism for cyclic nucleotide specificity, and suggest a model for ligand-dependent channel modulation. On the basis of amino acid sequence similarity to HCN channels, the cyclic nucleotide-gated, and eag- and KAT1-related families of channels are probably related to HCN channels in structure and mechanism.

Structural basis for modulation and agonist specificity of HCN pacemaker channels.,Zagotta WN, Olivier NB, Black KD, Young EC, Olson R, Gouaux E Nature. 2003 Sep 11;425(6954):200-5. PMID:12968185^[2]

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

References

↑ Proenza C, Angoli D, Agranovich E, Macri V, Accili EA. Pacemaker channels produce an instantaneous current. J Biol Chem. 2002 Feb 15;277(7):5101-9. Epub 2001 Dec 7. PMID:11741901 doi:http://dx.doi.org/10.1074/jbc.M106974200
↑ Zagotta WN, Olivier NB, Black KD, Young EC, Olson R, Gouaux E. Structural basis for modulation and agonist specificity of HCN pacemaker channels. Nature. 2003 Sep 11;425(6954):200-5. PMID:12968185 doi:http://dx.doi.org/10.1038/nature01922

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

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1q43"

@@ Line 1: / Line 1: @@
 ==HCN2I 443-640 in the presence of cAMP, selenomethionine derivative==
 <StructureSection load='1q43' size='340' side='right' caption='[[1q43]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
@@ Line 7: / Line 8: @@
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1q3e|1q3e]], [[1q5o|1q5o]]</td></tr>
 <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">HCN2, BCNG2 OR HAC1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10090 LK3 transgenic mice])</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=1q43 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1q43 OCA], [http://pdbe.org/1q43 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1q43 RCSB], [http://www.ebi.ac.uk/pdbsum/1q43 PDBsum]</span></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=1q43 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1q43 OCA], [http://pdbe.org/1q43 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1q43 RCSB], [http://www.ebi.ac.uk/pdbsum/1q43 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1q43 ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 15: / Line 16: @@
 Check<jmol>
   <jmolCheckbox>
-    <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/q4/1q43_consurf.spt"</scriptWhenChecked>
+    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/q4/1q43_consurf.spt"</scriptWhenChecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <text>to colour the structure by Evolutionary Conservation</text>
@@ Line 30: / Line 31: @@
 </div>
 <div class="pdbe-citations 1q43" style="background-color:#fffaf0;"></div>
-==See Also==
-*[[Ion channels|Ion channels]]
 == References ==
 <references/>

1q43

From Proteopedia

Revision as of 08:33, 24 February 2018

HCN2I 443-640 in the presence of cAMP, selenomethionine derivative

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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