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• W1504145802 endingPage "20903" @default.
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• W1504145802 abstract "Rat parvalbumin (PV), an EF-hand type Ca(2+)-binding protein, was expressed in Escherichia coli and mutated by replacing a Phe at position 102 with a unique Trp in order to introduce a distinct fluorescent label into the protein. Mass spectroscopy and NMR data indicate that the recombinant wild-type (PVWT) and F102W mutant (PVF102W) proteins have the expected molecular weight and retain the native structure. Both proteins contain two non-cooperative Ca2+/Mg(2+)-binding sites with intrinsic affinity constants, KCa and KMg, of 2.4 +/- 0.9 x 10(7) M-1 and of 2.9 +/- 0.2 x 10(4) M-1, respectively, for PVWT, and KCa and KMg, of 2.7 +/- 1.1 x 10(7) M-1 and of 4.4 +/- 0.3 x 10(4) M-1, respectively, for PVF102W. Based on the highly similar metal binding properties of PVWT and PVF102W the latter protein was used to study cation-dependent conformational changes. Trp fluorescence emission and UV difference spectra of PVF102W indicated that the Trp residue at position 102 is confined to a hydrophobic core and conformationally strongly restricted. Upon Ca2+ or Mg2+ binding the structural organization of the region around the Trp is hardly affected, but there are significant changes in its electrostatic environment. The conformational change upon binding of Ca2+ and Mg2+, as monitored by UV difference spectrophotometry, increases linearly from 0 to 2 cations bound, indicating that the binding of both ions contributes equally to the structural organization in this protein." @default.
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• W1504145802 date "1993-10-01" @default.
• W1504145802 modified "2023-10-14" @default.
• W1504145802 title "Metal binding properties of recombinant rat parvalbumin wild-type and F102W mutant." @default.
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• W1504145802 doi "https://doi.org/10.1016/s0021-9258(19)36871-1" @default.
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