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== | ==Soluble adenylyl cyclase CyaC from S. platensis in complex with alpha, beta-methylene-ATP in presence of bicarbonate== | ||
In an evolutionarily conserved signaling pathway, 'soluble' adenylyl | <StructureSection load='1wc5' size='340' side='right'caption='[[1wc5]], [[Resolution|resolution]] 2.30Å' scene=''> | ||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[1wc5]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Arthrospira_platensis Arthrospira platensis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1WC5 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1WC5 FirstGlance]. <br> | |||
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.3Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=APC:DIPHOSPHOMETHYLPHOSPHONIC+ACID+ADENOSYL+ESTER'>APC</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></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=1wc5 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1wc5 OCA], [https://pdbe.org/1wc5 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1wc5 RCSB], [https://www.ebi.ac.uk/pdbsum/1wc5 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1wc5 ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/O32393_ARTPT O32393_ARTPT] | |||
== Evolutionary Conservation == | |||
[[Image:Consurf_key_small.gif|200px|right]] | |||
Check<jmol> | |||
<jmolCheckbox> | |||
<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/wc/1wc5_consurf.spt"</scriptWhenChecked> | |||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | |||
<text>to colour the structure by Evolutionary Conservation</text> | |||
</jmolCheckbox> | |||
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1wc5 ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
In an evolutionarily conserved signaling pathway, 'soluble' adenylyl cyclases (sACs) synthesize the ubiquitous second messenger cyclic adenosine 3',5'-monophosphate (cAMP) in response to bicarbonate and calcium signals. Here, we present crystal structures of a cyanobacterial sAC enzyme in complex with ATP analogs, calcium and bicarbonate, which represent distinct catalytic states of the enzyme. The structures reveal that calcium occupies the first ion-binding site and directly mediates nucleotide binding. The single ion-occupied, nucleotide-bound state defines a novel, open adenylyl cyclase state. In contrast, bicarbonate increases the catalytic rate by inducing marked active site closure and recruiting a second, catalytic ion. The phosphates of the bound substrate analogs are rearranged, which would facilitate product formation and release. The mechanisms of calcium and bicarbonate sensing define a reaction pathway involving active site closure and metal recruitment that may be universal for class III cyclases. | |||
Bicarbonate activation of adenylyl cyclase via promotion of catalytic active site closure and metal recruitment.,Steegborn C, Litvin TN, Levin LR, Buck J, Wu H Nat Struct Mol Biol. 2005 Jan;12(1):32-7. Epub 2004 Dec 26. PMID:15619637<ref>PMID:15619637</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
[[ | <div class="pdbe-citations 1wc5" style="background-color:#fffaf0;"></div> | ||
==See Also== | |||
*[[3D Adenylyl cyclase 3D structures|3D Adenylyl cyclase 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Arthrospira platensis]] | [[Category: Arthrospira platensis]] | ||
[[Category: | [[Category: Large Structures]] | ||
[[Category: Buck | [[Category: Buck J]] | ||
[[Category: Levin | [[Category: Levin LR]] | ||
[[Category: Litvin | [[Category: Litvin TN]] | ||
[[Category: Steegborn | [[Category: Steegborn C]] | ||
[[Category: Wu | [[Category: Wu H]] | ||
Latest revision as of 16:28, 13 December 2023
Soluble adenylyl cyclase CyaC from S. platensis in complex with alpha, beta-methylene-ATP in presence of bicarbonateSoluble adenylyl cyclase CyaC from S. platensis in complex with alpha, beta-methylene-ATP in presence of bicarbonate
Structural highlights
FunctionEvolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedIn an evolutionarily conserved signaling pathway, 'soluble' adenylyl cyclases (sACs) synthesize the ubiquitous second messenger cyclic adenosine 3',5'-monophosphate (cAMP) in response to bicarbonate and calcium signals. Here, we present crystal structures of a cyanobacterial sAC enzyme in complex with ATP analogs, calcium and bicarbonate, which represent distinct catalytic states of the enzyme. The structures reveal that calcium occupies the first ion-binding site and directly mediates nucleotide binding. The single ion-occupied, nucleotide-bound state defines a novel, open adenylyl cyclase state. In contrast, bicarbonate increases the catalytic rate by inducing marked active site closure and recruiting a second, catalytic ion. The phosphates of the bound substrate analogs are rearranged, which would facilitate product formation and release. The mechanisms of calcium and bicarbonate sensing define a reaction pathway involving active site closure and metal recruitment that may be universal for class III cyclases. Bicarbonate activation of adenylyl cyclase via promotion of catalytic active site closure and metal recruitment.,Steegborn C, Litvin TN, Levin LR, Buck J, Wu H Nat Struct Mol Biol. 2005 Jan;12(1):32-7. Epub 2004 Dec 26. PMID:15619637[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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