2dy5: Difference between revisions
No edit summary |
No edit summary |
||
| Line 1: | Line 1: | ||
[[Image: | ==Crystal structure of rat heme oxygenase-1 in complex with heme and 2-[2-(4-chlorophenyl)ethyl]-2-[(1H-imidazol-1-yl)methyl]-1,3-dioxolane== | ||
<StructureSection load='2dy5' size='340' side='right' caption='[[2dy5]], [[Resolution|resolution]] 2.70Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[2dy5]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Rattus_norvegicus Rattus norvegicus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2DY5 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2DY5 FirstGlance]. <br> | |||
</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=224:1-({2-[2-(4-CHLOROPHENYL)ETHYL]-1,3-DIOXOLAN-2-YL}METHYL)-1H-IMIDAZOLE'>224</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene><br> | |||
<tr><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Heme_oxygenase Heme oxygenase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.14.99.3 1.14.99.3] </span></td></tr> | |||
<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2dy5 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2dy5 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=2dy5 RCSB], [http://www.ebi.ac.uk/pdbsum/2dy5 PDBsum]</span></td></tr> | |||
<table> | |||
== 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/dy/2dy5_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/chain_selection.php?pdb_ID=2ata ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Heme oxygenase (HO) catalyzes the regiospecific cleavage of the porphyrin ring of heme using reducing equivalents and O2 to produce biliverdin, iron, and CO. Because CO has a cytoprotective effect through the p38-MAPK pathway, HO is a potential therapeutic target in cancer. In fact, inhibition of the HO isoform HO-1 reduces Kaposi sarcoma tumor growth. Imidazole-dioxolane compounds have recently attracted attention because they have been reported to specifically inhibit HO-1, but not HO-2, unlike Cr-containing protoporphyrin IX, a classical inhibitor of HO, that inhibits not only both HO isoforms but also other hemoproteins. The inhibitory mechanism of imidazole-dioxolane compounds, however, has not yet been characterized. Here, we determine the crystal structure of the ternary complex of rat HO-1, heme, and an imidazole-dioxolane compound, 2-[2-(4-chlorophenyl)ethyl]-2-[(1H-imidazol-1-yl)methyl]-1,3-dioxolane. This compound bound on the distal side of the heme iron, where the imidazole and 4-chlorophenyl groups were bound to the heme iron and the hydrophobic cavity in HO, respectively. Binding of the bulky inhibitor in the narrow distal pocket shifted the distal helix to open the distal site and moved both the heme and the proximal helix. Furthermore, the biochemical characterization revealed that the catalytic reactions of both HO-1 and HO-2 were completely stopped after the formation of verdoheme in the presence of the imidazole-dioxolane compound. This result should be mainly due to the lower reactivity of the inhibitor-bound verdoheme with O2 compared to the reactivity of the inhibitor-bound heme with O2. | |||
X-ray crystallographic and biochemical characterization of the inhibitory action of an imidazole-dioxolane compound on heme oxygenase.,Sugishima M, Higashimoto Y, Oishi T, Takahashi H, Sakamoto H, Noguchi M, Fukuyama K Biochemistry. 2007 Feb 20;46(7):1860-7. Epub 2007 Jan 25. PMID:17253780<ref>PMID:17253780</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
==See Also== | ==See Also== | ||
*[[Heme oxygenase|Heme oxygenase]] | *[[Heme oxygenase|Heme oxygenase]] | ||
== References == | |||
== | <references/> | ||
< | __TOC__ | ||
</StructureSection> | |||
[[Category: Heme oxygenase]] | [[Category: Heme oxygenase]] | ||
[[Category: Rattus norvegicus]] | [[Category: Rattus norvegicus]] | ||
Revision as of 05:43, 29 September 2014
Crystal structure of rat heme oxygenase-1 in complex with heme and 2-[2-(4-chlorophenyl)ethyl]-2-[(1H-imidazol-1-yl)methyl]-1,3-dioxolaneCrystal structure of rat heme oxygenase-1 in complex with heme and 2-[2-(4-chlorophenyl)ethyl]-2-[(1H-imidazol-1-yl)methyl]-1,3-dioxolane
Structural highlights
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 PubMedHeme oxygenase (HO) catalyzes the regiospecific cleavage of the porphyrin ring of heme using reducing equivalents and O2 to produce biliverdin, iron, and CO. Because CO has a cytoprotective effect through the p38-MAPK pathway, HO is a potential therapeutic target in cancer. In fact, inhibition of the HO isoform HO-1 reduces Kaposi sarcoma tumor growth. Imidazole-dioxolane compounds have recently attracted attention because they have been reported to specifically inhibit HO-1, but not HO-2, unlike Cr-containing protoporphyrin IX, a classical inhibitor of HO, that inhibits not only both HO isoforms but also other hemoproteins. The inhibitory mechanism of imidazole-dioxolane compounds, however, has not yet been characterized. Here, we determine the crystal structure of the ternary complex of rat HO-1, heme, and an imidazole-dioxolane compound, 2-[2-(4-chlorophenyl)ethyl]-2-[(1H-imidazol-1-yl)methyl]-1,3-dioxolane. This compound bound on the distal side of the heme iron, where the imidazole and 4-chlorophenyl groups were bound to the heme iron and the hydrophobic cavity in HO, respectively. Binding of the bulky inhibitor in the narrow distal pocket shifted the distal helix to open the distal site and moved both the heme and the proximal helix. Furthermore, the biochemical characterization revealed that the catalytic reactions of both HO-1 and HO-2 were completely stopped after the formation of verdoheme in the presence of the imidazole-dioxolane compound. This result should be mainly due to the lower reactivity of the inhibitor-bound verdoheme with O2 compared to the reactivity of the inhibitor-bound heme with O2. X-ray crystallographic and biochemical characterization of the inhibitory action of an imidazole-dioxolane compound on heme oxygenase.,Sugishima M, Higashimoto Y, Oishi T, Takahashi H, Sakamoto H, Noguchi M, Fukuyama K Biochemistry. 2007 Feb 20;46(7):1860-7. Epub 2007 Jan 25. PMID:17253780[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
|
| ||||||||||||||||||
