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A simple method for the synthesis of caged peptides using a novel derivative of tyrosine, N-Fmoc-O-(2-nitrobenzyl)-tyrosine, is described. The derivative of tyrosine can be incorporated at any position in an amino acid sequence by solid-phase peptide synthesis under the condition for Fmoc chemistry, and caged peptides that contain nitrobenzyl group on the side chain of tyrosine residue can be obtained. The nitrobenzyl group can be photocleaved by UV irradiation and the half life of the intermediate during photolysis is approximately 7 microseconds. The method was successfully applied to the synthesis of caged neuropeptide Y (NPY). The binding affinity of the caged NPY for the Y1 receptor was one or two orders of magnitude lower than that of intact NPY, but it increased to the value for intact NPY upon irradiation by UV light.
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