Abstract
Unnatural paramagnetic α-amino acids with 2,2,5,5-tetramethyl-2,5-dihydro-1H-pyrrol-1-yloxyl-3-yl radical or 2,5,5-trimethylpyrrolidin-1-yloxyl-2-yl radical side-chains, including a lysine mimic azido precursor and their derivatives, are described. The new set of paramagnetic amino acids presented in this work with different (polar, nonpolar, aliphatic, aromatic, etc.) side-chains offers a useful tool for the ESR study of the protein structure and function after incorporation, fulfilling diverse structural requirements.
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