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- W2123454044 abstract "A strategy for the accurate determination of protein solution structures starting from X-ray data and a minimal set of NMR data is proposed and successfully applied to two complexes of calmodulin (CaM) with target peptides not previously described. Its implementation in the present case is based on the use of lanthanide ions as substitutes for calcium in one of the four calcium binding sites of CaM and the collection of pseudocontact shift (pcs) and residual dipolar coupling (rdc) restraints induced by the paramagnetic metals. Starting from the crystal structures, new structural models are calculated that are in excellent agreement with the paramagnetic restraints and differ significantly from the starting crystal structures. In particular, in both complexes, a change in orientation of the first helix of the N-terminal CaM domain and of the whole C-terminal domain is observed. The simultaneous use of paramagnetic pcs and rdc restraints has the following crucial advantages: (i) it allows one to assess the possible presence of interdomain conformational freedom, which cannot be detected if the rdc values are derived from external orienting media; (ii) in the absence of significant conformational freedom, the global orientation tensor can be independently and precisely determined from pcs values, which are less sensitive than rdc values to the presence of local structural inaccuracies, and therefore (iii) the relative rearrangement of a domain or a secondary structure element with respect to the metal-bearing domain can be detected." @default.
- W2123454044 created "2016-06-24" @default.
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- W2123454044 date "2009-03-24" @default.
- W2123454044 modified "2023-09-27" @default.
- W2123454044 title "Accurate Solution Structures of Proteins from X-ray Data and a Minimal Set of NMR Data: Calmodulin−Peptide Complexes As Examples" @default.
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- W2123454044 doi "https://doi.org/10.1021/ja8080764" @default.
- W2123454044 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19317469" @default.
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