2ij7
From Proteopedia
(New page: 200px<br /><applet load="2ij7" size="450" color="white" frame="true" align="right" spinBox="true" caption="2ij7, resolution 1.90Å" /> '''Structure of Mycobac...) |
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| - | [[Image:2ij7.gif|left|200px]]<br /><applet load="2ij7" size=" | + | [[Image:2ij7.gif|left|200px]]<br /><applet load="2ij7" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="2ij7, resolution 1.90Å" /> | caption="2ij7, resolution 1.90Å" /> | ||
'''Structure of Mycobacterium tuberculosis CYP121 in complex with the antifungal drug fluconazole'''<br /> | '''Structure of Mycobacterium tuberculosis CYP121 in complex with the antifungal drug fluconazole'''<br /> | ||
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==About this Structure== | ==About this Structure== | ||
| - | 2IJ7 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Mycobacterium_tuberculosis Mycobacterium tuberculosis] with HEM and TPF as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http:// | + | 2IJ7 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Mycobacterium_tuberculosis Mycobacterium tuberculosis] with <scene name='pdbligand=HEM:'>HEM</scene> and <scene name='pdbligand=TPF:'>TPF</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2IJ7 OCA]. |
==Reference== | ==Reference== | ||
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[[Category: tuberculosis]] | [[Category: tuberculosis]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jan 23 15:18:32 2008'' |
Revision as of 13:18, 23 January 2008
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Structure of Mycobacterium tuberculosis CYP121 in complex with the antifungal drug fluconazole
Overview
Azole and triazole drugs are cytochrome P450 inhibitors widely used as, fungal antibiotics and possessing potent antimycobacterial activity. We, present here the crystal structure of Mycobacterium tuberculosis, cytochrome P450 CYP121 in complex with the triazole drug fluconazole, revealing a new azole heme ligation mode. In contrast to other, structurally characterized cytochrome P450 azole complexes, where the, azole nitrogen directly coordinates the heme iron, in CYP121 fluconazole, does not displace the aqua sixth heme ligand but occupies a position that, allows formation of a direct hydrogen bond to the aqua sixth heme ligand., Direct ligation of fluconazole to the heme iron is observed in a minority, of CYP121 molecules, albeit with severe deviations from ideal geometry due, to close contacts with active site residues. Analysis of both ligand-on, and -off structures reveals the relative position of active site residues, derived from the I-helix is a key determinant in the relative ratio of on, and off states. Regardless, both ligand-bound states lead to P450, inactivation by active site occlusion. This previously unrecognized means, of P450 inactivation is consistent with spectroscopic analyses in both, solution and in the crystalline form and raises important questions, relating to interaction of azoles with both pathogen and human P450s.
About this Structure
2IJ7 is a Single protein structure of sequence from Mycobacterium tuberculosis with and as ligands. Full crystallographic information is available from OCA.
Reference
Crystal structure of the Mycobacterium tuberculosis P450 CYP121-fluconazole complex reveals new azole drug-P450 binding mode., Seward HE, Roujeinikova A, McLean KJ, Munro AW, Leys D, J Biol Chem. 2006 Dec 22;281(51):39437-43. Epub 2006 Oct 6. PMID:17028183
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