2q61: Difference between revisions
New page: left|200px<br /> <applet load="2q61" size="450" color="white" frame="true" align="right" spinBox="true" caption="2q61, resolution 2.197Å" /> '''Crystal Structure ... |
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[[Image:2q61. | [[Image:2q61.jpg|left|200px]]<br /><applet load="2q61" size="350" color="white" frame="true" align="right" spinBox="true" | ||
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caption="2q61, resolution 2.197Å" /> | caption="2q61, resolution 2.197Å" /> | ||
'''Crystal Structure of PPARgamma ligand binding domain bound to partial agonist SR145'''<br /> | '''Crystal Structure of PPARgamma ligand binding domain bound to partial agonist SR145'''<br /> | ||
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==Overview== | ==Overview== | ||
Binding to helix 12 of the ligand-binding domain of PPARgamma is required, for full agonist activity. Previously, the degree of stabilization of the, activation function 2 (AF-2) surface was thought to correlate with the, degree of agonism and transactivation. To examine this mechanism, we, probed structural dynamics of PPARgamma with agonists that induced graded, transcriptional responses. Here we present crystal structures and amide, H/D exchange (HDX) kinetics for six of these complexes. Amide HDX revealed, each ligand induced unique changes to the dynamics of the ligand-binding, domain (LBD). Full agonists stabilized helix 12, whereas intermediate and, partial agonists did not at all, and rather differentially stabilized, other regions of the binding pocket. The gradient of PPARgamma, transactivation cannot be accounted for solely through changes to the, dynamics of AF-2. Thus, our understanding of allosteric signaling must be, extended beyond the idea of a dynamic helix 12 acting as a molecular, switch. | Binding to helix 12 of the ligand-binding domain of PPARgamma is required, for full agonist activity. Previously, the degree of stabilization of the, activation function 2 (AF-2) surface was thought to correlate with the, degree of agonism and transactivation. To examine this mechanism, we, probed structural dynamics of PPARgamma with agonists that induced graded, transcriptional responses. Here we present crystal structures and amide, H/D exchange (HDX) kinetics for six of these complexes. Amide HDX revealed, each ligand induced unique changes to the dynamics of the ligand-binding, domain (LBD). Full agonists stabilized helix 12, whereas intermediate and, partial agonists did not at all, and rather differentially stabilized, other regions of the binding pocket. The gradient of PPARgamma, transactivation cannot be accounted for solely through changes to the, dynamics of AF-2. Thus, our understanding of allosteric signaling must be, extended beyond the idea of a dynamic helix 12 acting as a molecular, switch. | ||
==About this Structure== | ==About this Structure== | ||
2Q61 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 SF1 as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http:// | 2Q61 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=SF1:'>SF1</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2Q61 OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: protein-ligand complex]] | [[Category: protein-ligand complex]] | ||
''Page seeded by [http:// | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jan 23 12:44:11 2008'' | ||
