Iuga A, Brunner E. Phosphorylated amino acids: model compounds for solid-state 31P NMR spectroscopic studies of proteins.
MAGNETIC RESONANCE IN CHEMISTRY : MRC 2004;
42:369-372. [PMID:
15022197 DOI:
10.1002/mrc.1356]
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Abstract
Solid-state 31P NMR spectroscopy was applied to measure the isotropic chemical shifts, chemical shift anisotropies and asymmetry parameters of three phosphorylated amino acids, O-phospho-L-serine, O-phospho-L-threonine and O-phospho-L-tyrosine. The cross-polarization buildup rates and longitudinal relaxation times of 31P and 1H were-determined and compared with the values measured for a triphosphate (GppCH2p) bound to a crystalline protein (Ras). It is shown that the phosphorylated amino acids are well-suited model compounds, e.g. for the optimization of experiments on crystalline proteins. Two-dimensional exchange experiments on O-phospho-L-tyrosine indicate the existence of an exchange between the two different conformations of the molecule.
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