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- W2125003003 abstract "Abstract High‐resolution structure determination of homo‐oligomeric protein complexes remains a daunting task for NMR spectroscopists. Although isotope‐filtered experiments allow separation of intermolecular NOEs from intramolecular NOEs and determination of the structure of each subunit within the oligomeric state, degenerate chemical shifts of equivalent nuclei from different subunits make it difficult to assign intermolecular NOEs to nuclei from specific pairs of subunits with certainty, hindering structural analysis of the oligomeric state. Here, we introduce a graphical method, DISCO , for the analysis of intermolecular distance restraints and structure determination of symmetric homo‐oligomers using residual dipolar couplings. Based on knowledge that the symmetry axis of an oligomeric complex must be parallel to an eigenvector of the alignment tensor of residual dipolar couplings, we can represent distance restraints as annuli in a plane encoding the parameters of the symmetry axis. Oligomeric protein structures with the best restraint satisfaction correspond to regions of this plane with the greatest number of overlapping annuli. This graphical analysis yields a technique to characterize the complete set of oligomeric structures satisfying the distance restraints and to quantitatively evaluate the contribution of each distance restraint. We demonstrate our method for the trimeric E. coli diacylglycerol kinase, addressing the challenges in obtaining subunit assignments for distance restraints. We also demonstrate our method on a dimeric mutant of the immunoglobulin‐binding domain B1 of streptococcal protein G to show the resilience of our method to ambiguous atom assignments. In both studies, DISCO computed oligomer structures with high accuracy despite using ambiguously assigned distance restraints." @default.
- W2125003003 created "2016-06-24" @default.
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- W2125003003 date "2011-04-27" @default.
- W2125003003 modified "2023-10-11" @default.
- W2125003003 title "A graphical method for analyzing distance restraints using residual dipolar couplings for structure determination of symmetric protein homo‐oligomers" @default.
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- W2125003003 doi "https://doi.org/10.1002/pro.620" @default.
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