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2idr

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{{STRUCTURE_2idr| PDB=2idr | SCENE= }}
{{STRUCTURE_2idr| PDB=2idr | SCENE= }}
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'''Crystal structure of translation initiation factor EIF4E from wheat'''
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===Crystal structure of translation initiation factor EIF4E from wheat===
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==Overview==
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Eukaryotic translation initiation factor-4E (eIF4E) recognizes and binds the m(7) guanosine nucleotide at the 5' end of eukaryotic messenger RNAs; this protein-RNA interaction is an essential step in the initiation of protein synthesis. The structure of eIF4E from wheat (Triticum aestivum) was investigated using a combination of x-ray crystallography and nuclear magnetic resonance (NMR) methods. The overall fold of the crystallized protein was similar to eIF4E from other species, with eight beta-strands, three alpha-helices, and three extended loops. Surprisingly, the wild-type protein did not crystallize with m(7)GTP in its binding site, despite the ligand being present in solution; conformational changes in the cap-binding loops created a large cavity at the usual cap-binding site. The eIF4E crystallized in a dimeric form with one of the cap-binding loops of one monomer inserted into the cavity of the other. The protein also contained an intramolecular disulfide bridge between two cysteines (Cys) that are conserved only in plants. A Cys-to-serine mutant of wheat eIF4E, which lacked the ability to form the disulfide, crystallized with m(7)GDP in its binding pocket, with a structure similar to that of the eIF4E-cap complex of other species. NMR spectroscopy was used to show that the Cys that form the disulfide in the crystal are reduced in solution but can be induced to form the disulfide under oxidizing conditions. The observation that the disulfide-forming Cys are conserved in plants raises the possibility that their oxidation state may have a role in regulating protein function. NMR provided evidence that in oxidized eIF4E, the loop that is open in the ligand-free crystal dimer is relatively flexible in solution. An NMR-based binding assay showed that the reduced wheat eIF4E, the oxidized form with the disulfide, and the Cys-to-serine mutant protein each bind m(7)GTP in a similar and labile manner, with dissociation rates in the range of 20 to 100 s(-1).
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{{ABSTRACT_PUBMED_17322339}}
==About this Structure==
==About this Structure==
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[[Category: Eukaryotic initiation factor 4e]]
[[Category: Eukaryotic initiation factor 4e]]
[[Category: Translation regulator]]
[[Category: Translation regulator]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 07:22:48 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 09:35:49 2008''

Revision as of 06:35, 28 July 2008

Image:2idr.png

Template:STRUCTURE 2idr

Crystal structure of translation initiation factor EIF4E from wheat

Template:ABSTRACT PUBMED 17322339

About this Structure

2IDR is a Single protein structure of sequence from Triticum aestivum. Full crystallographic information is available from OCA.

Reference

The structure of eukaryotic translation initiation factor-4E from wheat reveals a novel disulfide bond., Monzingo AF, Dhaliwal S, Dutt-Chaudhuri A, Lyon A, Sadow JH, Hoffman DW, Robertus JD, Browning KS, Plant Physiol. 2007 Apr;143(4):1504-18. Epub 2007 Feb 23. PMID:17322339

Page seeded by OCA on Mon Jul 28 09:35:49 2008

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