1rkp

<table><tr><td colspan='2'>[[1rkp]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1RKP OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=1RKP FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=IBM:3-ISOBUTYL-1-METHYLXANTHINE'>IBM</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr>

<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[1rko|1rko]]</div></td></tr>

<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">PDE5A, PDE5, PDE5A1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</td></tr>

<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/3',5'-cyclic-nucleotide_phosphodiesterase 3',5'-cyclic-nucleotide phosphodiesterase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.4.17 3.1.4.17] </span></td></tr>

<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=1rkp FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1rkp OCA], [http://pdbe.org/1rkp PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1rkp RCSB], [http://www.ebi.ac.uk/pdbsum/1rkp PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1rkp ProSAT]</span></td></tr>

[[http://www.uniprot.org/uniprot/PDE5A_HUMAN PDE5A_HUMAN]] Plays a role in signal transduction by regulating the intracellular concentration of cyclic nucleotides. This phosphodiesterase catalyzes the specific hydrolysis of cGMP to 5'-GMP.

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== Publication Abstract from PubMed ==

Cyclic nucleotide phosphodiesterases (PDEs) are a superfamily of enzymes controlling cellular concentrations of the second messengers cAMP and cGMP. Crystal structures of the catalytic domains of cGMP-specific PDE5A1 and cAMP-specific PDE4D2 in complex with the nonselective inhibitor 3-isobutyl-1-methylxanthine have been determined at medium resolution. The catalytic domain of PDE5A1 has the same topological folding as that of PDE4D2, but three regions show different tertiary structures, including residues 79-113, 208-224 (H-loop), and 341-364 (M-loop) in PDE4D2 or 535-566, 661-676, and 787-812 in PDE5A1, respectively. Because H- and M-loops are involved in binding of the selective inhibitors, the different conformations of the loops, thus the distinct shapes of the active sites, will be a determinant of inhibitor selectivity in PDEs. IBMX binds to a subpocket that comprises key residues Ile-336, Phe-340, Gln-369, and Phe-372 of PDE4D2 or Val-782, Phe-786, Gln-817, and Phe-820 of PDE5A1. This subpocket may be a common site for binding nonselective inhibitors of PDEs.

Crystal structures of phosphodiesterases 4 and 5 in complex with inhibitor 3-isobutyl-1-methylxanthine suggest a conformation determinant of inhibitor selectivity.,Huai Q, Liu Y, Francis SH, Corbin JD, Ke H J Biol Chem. 2004 Mar 26;279(13):13095-101. Epub 2003 Dec 10. PMID:14668322<ref>PMID:14668322</ref>

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

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<div class="pdbe-citations 1rkp" style="background-color:#fffaf0;"></div>

== References ==

<references/>

[[Category: 3',5'-cyclic-nucleotide phosphodiesterase]]

[[Category: Human]]

[[Category: Corbin, J D]]

[[Category: Francis, S H]]

[[Category: Huai, Q]]

[[Category: Ke, H]]

[[Category: Liu, Y]]

[[Category: Viagra]]