Abstract: This invention relates to: a labeled amino acid that can be introduced into a protein with the aid of a protein synthesis system; a functional protein having functions derived from a label compound; a labeled amino acid comprising an aromatic ring bound to an amino acid side chain and a label compound bound thereto via the aromatic ring; a functional protein to which the labeled amino acid has been introduced; and a novel method for effectively obtaining a labeled amino acid-tRNA complex.

Abstract: This invention relates to: a labeled amino acid that can be introduced into a protein with the aid of a protein synthesis system; a functional protein having functions derived from a label compound; a labeled amino acid comprising an aromatic ring bound to an amino acid side chain and a label compound bound thereto via the aromatic ring; a functional protein to which the labeled amino acid has been introduced; and a novel method for effectively obtaining a labeled amino acid-tRNA complex.

Abstract: There are provided a method for selection of a substance which is capable of controlling activation of prorenin where an adjusting ability of the activation of prorenin by protein-protein interaction in a profragment region of prorenin as indicator is used; a prorenin activation controlling substance having a function of controlling the activation of prorenin based on protein-protein interaction by a profragment region of prorenin; and hypotensor, organ hypertrophy suppressor and arterial thickening suppressor containing the prorenin activation controlling substance as an effective ingredient.