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1y4c

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{{STRUCTURE_1y4c| PDB=1y4c | SCENE= }}
{{STRUCTURE_1y4c| PDB=1y4c | SCENE= }}
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'''Designed Helical Protein fusion MBP'''
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===Designed Helical Protein fusion MBP===
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==Overview==
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An IL-4 antagonist was designed based on structural and biochemical analysis of unbound IL-4 and IL-4 in complex with its high-affinity receptor (IL-4Ralpha). Our design strategy sought to capture a protein-protein interaction targeting the high affinity that IL-4 has for IL-4Ralpha. This strategy has impact due to the potential relevance of IL-4Ralpha as a drug target in the treatment of asthma. To mimic the IL-4 binding surface, critical side chains for receptor binding were identified, and these side chains were transplanted onto a previously characterized, de novo-designed four-helix protein called designed helical protein 1 (DHP-1). This first-generation design resolved the ambiguity previously described for the connectivity between helices in DHP-1 and resulted in a protein capable of binding to IL-4Ralpha. The second-generation antagonist was based upon further molecular modeling, and it succeeded in binding IL-4Ralpha better than the first-generation. This protein, termed DHP-14-AB, yielded a protein with a cooperative unfolding transition (DeltaGu0=8.1 kcal/mol) and an IC50 of 27 microM when in competition with IL-4 whereas DHP-1 had no affinity for IL-4Ralpha. The crystal structure of DHP-14-AB was determined to 1.9-A resolution and was compared with IL-4. This comparison revealed how design strategies targeting protein-protein interactions require high-resolution 3D data and the incorporation of orientation-specific information at the level of side-chains and secondary structure element interactions.
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(as it appears on PubMed at http://www.pubmed.gov), where 15684085 is the PubMed ID number.
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{{ABSTRACT_PUBMED_15684085}}
==About this Structure==
==About this Structure==
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[[Category: De novo designed helical protein]]
[[Category: De novo designed helical protein]]
[[Category: Maltose binding protein fusion]]
[[Category: Maltose binding protein fusion]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 15:51:51 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 11:24:03 2008''

Revision as of 08:24, 28 July 2008

Image:1y4c.png

Template:STRUCTURE 1y4c

Designed Helical Protein fusion MBP

Template:ABSTRACT PUBMED 15684085

About this Structure

1Y4C is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

Reference

De novo design of an IL-4 antagonist and its structure at 1.9 A., Laporte SL, Forsyth CM, Cunningham BC, Miercke LJ, Akhavan D, Stroud RM, Proc Natl Acad Sci U S A. 2005 Feb 8;102(6):1889-94. Epub 2005 Jan 31. PMID:15684085

Page seeded by OCA on Mon Jul 28 11:24:03 2008

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