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- W2066469934 abstract "The effects of Ca(2+) binding on the dynamic properties of Ca(2+)-binding proteins are important in Ca(2+) signaling. To understand the role of Ca(2+) binding, we have successfully designed a Ca(2+)-binding site in the domain 1 of rat CD2 (denoted as Ca.CD2) with the desired structure and retained function. In this study, the backbone dynamic properties of Ca.CD2 have been investigated using (15)N spin relaxation NMR spectroscopy to reveal the effect of Ca(2+) binding on the global and local dynamic properties without the complications of multiple interactive Ca(2+) binding and global conformational change. Like rat CD2 (rCD2) and human CD2 (hCD2), residues involved in the recognition of the target molecule CD48 exhibit high flexibility. Mutations N15D and N17D that introduce the Ca(2+) ligands increase the flexibility of the neighboring residues. Ca(2+)-induced local dynamic changes occur mainly at the residues proximate to the Ca(2+)-binding pocket or the residues in loop regions. The beta-strand B of Ca.CD2 that provides two Asp for the Ca(2+) undergoes an S(2) decrease upon the Ca(2+) binding, while the DE-loop that provides one Asn and one Asp undergoes an S(2) increase. Our study suggests that Ca(2+) binding has a differential effect on the rigidity of the residues depending on their flexibility and location within the secondary structure." @default.
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- W2066469934 date "2005-05-14" @default.
- W2066469934 modified "2023-09-27" @default.
- W2066469934 title "The Effects of Ca<sup>2+</sup> Binding on the Dynamic Properties of a Designed Ca<sup>2+</sup>-Binding Protein<sup>,</sup>" @default.
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- W2066469934 doi "https://doi.org/10.1021/bi050463n" @default.
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