1m49: Difference between revisions

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[[Image:1m49.gif|left|200px]]
{{Seed}}
[[Image:1m49.png|left|200px]]


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{{STRUCTURE_1m49|  PDB=1m49  |  SCENE=  }}  
{{STRUCTURE_1m49|  PDB=1m49  |  SCENE=  }}  


'''Crystal Structure of Human Interleukin-2 Complexed with SP-1985'''
===Crystal Structure of Human Interleukin-2 Complexed with SP-1985===




==Overview==
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Understanding binding properties at protein-protein interfaces has been limited to structural and mutational analyses of natural binding partners or small peptides identified by phage display. Here, we present a high-resolution analysis of a nonpeptidyl small molecule, previously discovered by medicinal chemistry [Tilley, J. W., et al. (1997) J. Am. Chem. Soc. 119, 7589-7590], which binds to the cytokine IL-2. The small molecule binds to the same site that binds the IL-2 alpha receptor and buries into a groove not seen in the free structure of IL-2. Comparison of the bound and several free structures shows this site to be composed of two subsites: one is rigid, and the other is highly adaptive. Thermodynamic data suggest the energy barriers between these conformations are low. The subsites were dissected by using a site-directed screening method called tethering, in which small fragments were captured by disulfide interchange with cysteines introduced into IL-2 around these subsites. X-ray structures with the tethered fragments show that the subsite-binding interactions are similar to those observed with the original small molecule. Moreover, the adaptive subsite tethered many more compounds than did the rigid one. Thus, the adaptive nature of a protein-protein interface provides sites for small molecules to bind and underscores the challenge of applying structure-based design strategies that cannot accurately predict a dynamic protein surface.
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{{ABSTRACT_PUBMED_12582206}}


==About this Structure==
==About this Structure==
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[[Category: Four-helix bundle]]
[[Category: Four-helix bundle]]
[[Category: Small molecule complex]]
[[Category: Small molecule complex]]
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Revision as of 20:10, 2 July 2008

File:1m49.png

Template:STRUCTURE 1m49

Crystal Structure of Human Interleukin-2 Complexed with SP-1985

Template:ABSTRACT PUBMED 12582206

About this Structure

1M49 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Binding of small molecules to an adaptive protein-protein interface., Arkin MR, Randal M, DeLano WL, Hyde J, Luong TN, Oslob JD, Raphael DR, Taylor L, Wang J, McDowell RS, Wells JA, Braisted AC, Proc Natl Acad Sci U S A. 2003 Feb 18;100(4):1603-8. Epub 2003 Feb 11. PMID:12582206

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