1kd9
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X-RAY STRUCTURE OF THE COILED COIL GCN4 ACID BASE HETERODIMER ACID-d12La16L BASE-d12La16L
OverviewOverview
An important goal in biology is to predict from sequence data the, high-resolution structures of proteins and the interactions that occur, between them. In this paper, we describe a computational approach that can, make these types of predictions for a series of coiled-coil dimers. Our, method comprises a dual strategy that augments extensive conformational, sampling with molecular mechanics minimization. To test the performance of, the method, we designed six heterodimeric coiled coils with a range of, stabilities and solved x-ray crystal structures for three of them. The, stabilities and structures predicted by the calculations agree very well, with experimental data: the average error in unfolding free energies is <1, kcal/mol, and nonhydrogen atoms in the predicted structures superimpose, onto the experimental structures with rms deviations <0.7 A. We have also, tested the method on a series of homodimers derived from, vitellogenin-binding protein. The predicted relative stabilities of the, homodimers show excellent agreement with previously published experimental, measurements. A critical step in our procedure is to use energy, minimization to relax side-chain geometries initially selected from a, rotamer library. Our results show that computational methods can predict, interaction specificities that are in good agreement with experimental, data.
About this StructureAbout this Structure
1KD9 is a Protein complex structure of sequences from [1] with ACE as ligand. Full crystallographic information is available from OCA.
ReferenceReference
Side-chain repacking calculations for predicting structures and stabilities of heterodimeric coiled coils., Keating AE, Malashkevich VN, Tidor B, Kim PS, Proc Natl Acad Sci U S A. 2001 Dec 18;98(26):14825-30. PMID:11752430
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