View source for 3ar8

==Calcium pump crystal structure with bound AlF4, TNP-AMP and TG==
<StructureSection load='3ar8' size='340' side='right' caption='[[3ar8]], [[Resolution|resolution]] 2.60&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3ar8]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Oryctolagus_cuniculus Oryctolagus cuniculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3AR8 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3AR8 FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ALF:TETRAFLUOROALUMINATE+ION'>ALF</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=TG1:OCTANOIC+ACID+[3S-[3ALPHA,+3ABETA,+4ALPHA,+6BETA,+6ABETA,+7BETA,+8ALPHA(Z),+9BALPHA]]-6-(ACETYLOXY)-2,3,-3A,4,5,6,6A,7,8,9B-DECAHYDRO-3,3A-DIHYDROXY-3,6,9-TRIMETHYL-8-[(2-METHYL-1-OXO-2-BUTENYL)OXY]-2-OXO-4-(1-OXOBUTOXY)-AZULENO[4,5-B]FURAN-7-YL+ESTER'>TG1</scene>, <scene name='pdbligand=TM1:2,3-O-[(1R)-2,4,6-TRINITROCYCLOHEXA-2,5-DIENE-1,1-DIYL]ADENOSINE+5-(DIHYDROGEN+PHOSPHATE)'>TM1</scene></td></tr>
<tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=ACE:ACETYL+GROUP'>ACE</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2zbg|2zbg]], [[2dqs|2dqs]], [[3ar2|3ar2]], [[3ar3|3ar3]], [[3ar4|3ar4]], [[3ar5|3ar5]], [[3ar6|3ar6]], [[3ar7|3ar7]], [[3ar9|3ar9]]</td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Calcium-transporting_ATPase Calcium-transporting ATPase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.6.3.8 3.6.3.8] </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=3ar8 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3ar8 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3ar8 RCSB], [http://www.ebi.ac.uk/pdbsum/3ar8 PDBsum]</span></td></tr>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Trinitrophenyl derivatives of adenine nucleotides are widely used for probing ATP-binding sites. Here we describe crystal structures of Ca(2+)-ATPase, a representative P-type ATPase, in the absence of Ca(2+) with bound ATP, trinitrophenyl-ATP, -ADP, and -AMP at better than 2.4-A resolution, stabilized with thapsigargin, a potent inhibitor. These crystal structures show that the binding mode of the trinitrophenyl derivatives is distinctly different from the parent adenine nucleotides. The adenine binding pocket in the nucleotide binding domain of Ca(2+)-ATPase is now occupied by the trinitrophenyl group, and the side chains of two arginines sandwich the adenine ring, accounting for the much higher affinities of the trinitrophenyl derivatives. Trinitrophenyl nucleotides exhibit a pronounced fluorescence in the E2P ground state but not in the other E2 states. Crystal structures of the E2P and E2 approximately P analogues of Ca(2+)-ATPase with bound trinitrophenyl-AMP show that different arrangements of the three cytoplasmic domains alter the orientation and water accessibility of the trinitrophenyl group, explaining the origin of "superfluorescence." Thus, the crystal structures demonstrate that ATP and its derivatives are highly adaptable to a wide range of site topologies stabilized by a variety of interactions.

Trinitrophenyl derivatives bind differently from parent adenine nucleotides to Ca2+-ATPase in the absence of Ca2+,Toyoshima C, Yonekura SI, Tsueda J, Iwasawa S Proc Natl Acad Sci U S A. 2011 Jan 14. PMID:21239683<ref>PMID:21239683</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>

==See Also==
*[[ATPase|ATPase]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Calcium-transporting ATPase]]
[[Category: Oryctolagus cuniculus]]
[[Category: Iwasawa, S]]
[[Category: Toyoshima, C]]
[[Category: Tsueda, J]]
[[Category: Yonekura, S]]
[[Category: Atp binding]]
[[Category: Calcium binding]]
[[Category: Calcium transport]]
[[Category: Endoplasmic reticulum]]
[[Category: Hydrolase]]
[[Category: Hydrolase-hydrolase inhibitor complex]]
[[Category: P-type atpase]]
[[Category: Sarcoplasmic reticulum]]