1fkd
From Proteopedia
(New page: 200px<br /> <applet load="1fkd" size="450" color="white" frame="true" align="right" spinBox="true" caption="1fkd, resolution 1.72Å" /> '''FK-506 BINDING PROT...) |
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| - | [[Image:1fkd.gif|left|200px]]<br /> | + | [[Image:1fkd.gif|left|200px]]<br /><applet load="1fkd" size="350" color="white" frame="true" align="right" spinBox="true" |
| - | <applet load="1fkd" size=" | + | |
caption="1fkd, resolution 1.72Å" /> | caption="1fkd, resolution 1.72Å" /> | ||
'''FK-506 BINDING PROTEIN: THREE-DIMENSIONAL STRUCTURE OF THE COMPLEX WITH THE ANTAGONIST L-685,818'''<br /> | '''FK-506 BINDING PROTEIN: THREE-DIMENSIONAL STRUCTURE OF THE COMPLEX WITH THE ANTAGONIST L-685,818'''<br /> | ||
==Overview== | ==Overview== | ||
| - | L-685,818 differs only slightly in structure from the immunosuppressive | + | L-685,818 differs only slightly in structure from the immunosuppressive drug FK-506, and both compounds bind with comparable affinity to the 12-kDa FK-506-binding protein (FKBP12), the major intracellular receptor for the drug. Despite these similarities, L-685,818 is a potent antagonist of both the immunosuppressive and toxic effects of the drug. Here, we present a structural analysis of this problem. Although FK-506 and L-685,818 differ greatly in pharmacology, we have found that the three-dimensional structures of their complexes with FKBP12 are essentially identical. Approximately half of each ligand is in contact with the receptor protein, and half is exposed to solvent; the exposed region includes the two sites where the compounds differ. These results indicate that the profound differences in the pharmacology of these two compounds are not caused by any difference in their interaction with FKBP12. Rather, these effects arise because relatively minor changes in the exposed part of a bound ligand have a strong effect on how FKBP12-ligand complexes interact with calcineurin, their putative intracellular target. In addition, FK-506 complexes with FKBP12 proteins from several species all inhibit mammalian calcineurin. Analysis of the three-dimensional structure of the complex with respect to residues conserved among these proteins suggests a small number of surface residues near the bound ligands that may play a critical role in interactions between the protein-drug complex and calcineurin. |
==About this Structure== | ==About this Structure== | ||
| - | 1FKD is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] with 818 as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http:// | + | 1FKD is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] with <scene name='pdbligand=818:'>818</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1FKD OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Homo sapiens]] | [[Category: Homo sapiens]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
| - | [[Category: Becker, J | + | [[Category: Becker, J W.]] |
| - | [[Category: Mckeever, B | + | [[Category: Mckeever, B M.]] |
[[Category: Rotonda, J.]] | [[Category: Rotonda, J.]] | ||
[[Category: 818]] | [[Category: 818]] | ||
[[Category: cis-trans isomerase]] | [[Category: cis-trans isomerase]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:39:34 2008'' |
Revision as of 10:39, 21 February 2008
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FK-506 BINDING PROTEIN: THREE-DIMENSIONAL STRUCTURE OF THE COMPLEX WITH THE ANTAGONIST L-685,818
Overview
L-685,818 differs only slightly in structure from the immunosuppressive drug FK-506, and both compounds bind with comparable affinity to the 12-kDa FK-506-binding protein (FKBP12), the major intracellular receptor for the drug. Despite these similarities, L-685,818 is a potent antagonist of both the immunosuppressive and toxic effects of the drug. Here, we present a structural analysis of this problem. Although FK-506 and L-685,818 differ greatly in pharmacology, we have found that the three-dimensional structures of their complexes with FKBP12 are essentially identical. Approximately half of each ligand is in contact with the receptor protein, and half is exposed to solvent; the exposed region includes the two sites where the compounds differ. These results indicate that the profound differences in the pharmacology of these two compounds are not caused by any difference in their interaction with FKBP12. Rather, these effects arise because relatively minor changes in the exposed part of a bound ligand have a strong effect on how FKBP12-ligand complexes interact with calcineurin, their putative intracellular target. In addition, FK-506 complexes with FKBP12 proteins from several species all inhibit mammalian calcineurin. Analysis of the three-dimensional structure of the complex with respect to residues conserved among these proteins suggests a small number of surface residues near the bound ligands that may play a critical role in interactions between the protein-drug complex and calcineurin.
About this Structure
1FKD is a Single protein structure of sequence from Homo sapiens with as ligand. Full crystallographic information is available from OCA.
Reference
FK-506-binding protein: three-dimensional structure of the complex with the antagonist L-685,818., Becker JW, Rotonda J, McKeever BM, Chan HK, Marcy AI, Wiederrecht G, Hermes JD, Springer JP, J Biol Chem. 1993 May 25;268(15):11335-9. PMID:7684380
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