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The Ras-binding domain (RBD) of c-Raf-1 has been synthesized chemically, taking advantage of the chemical ligation of two peptide fragments of the protein. This procedure allowed incorporation of an unnatural amino acid (N1-methyl-7-azatryptophan) at position 91 of RBD, producing a protein with fluorescent properties distinct from and distinguishable from those of proteins containing the natural fluorophore tryptophan. The resulting protein was shown to interact with Ras in a manner that was almost indistinguishable from that of unmodified RBD based on transient kinetic monitoring of the binding event. Modified RBD containing the L-isomer of the unnatural amino acid or its racemic D,L mixture appeared to interact identically with Ras. The approach demonstrates a general procedure for the introduction of unnatural amino acids that can be used for monitoring protein-protein interactions and for the introduction of an unnatural backbone structure at strategic positions.

Design, total chemical synthesis, and binding properties of a [Leu-91- N 1 -methyl-7-azaTrp]Ras-binding domain of c-Raf-1

Design, total chemical synthesis, and binding properties of a [Leu-91- N ¹ -methyl-7-azaTrp]Ras-binding domain of c-Raf-1