MODIFIED FIBROIN

The present invention relates to a modified fibroin including a domain sequence represented by Formula 1: [(A) n motif-REP] m , in which the domain sequence has an amino acid sequence locally containing a region with locally high hydropathy index equivalent to an amino acid sequence in which one or a plurality of amino acid residues in REP are substituted with amino acid residues with a high hydropathy index and/or one or a plurality of amino acid residues with a high hydropathy index are inserted into REP, as compared to naturally occurring fibroin. In Formula 1, (A) n motif represents an amino acid sequence consisting of 4 to 20 amino acid residues and the number of alanine residues relative to the total number of amino acid residues in the (A) n motif is 83% or more. REP represents an amino acid sequence consisting of 10 to 200 amino acid residues. m represents an integer of 10 to 300, A plurality of (A) n motifs and the like may be the same amino acid sequence or different amino acid sequences.