Spiber Inc.

Shota Togashi

Yunosuke Abe

Keisuke Morita

Tetsuo Asakura

Hiroyuki Nakamura

Masato Matsuo

The present invention relates to a modified fibroin including a domain sequence represented by Formula 1: [(A)motif-REP]or Formula 2: [(A)motif-REP]-(A)motif, and having a serine residue content rate of less than 5.5%. [In Formula 1 and Formula 2, the (A)motif represents an amino acid sequence consisting of 4 to 27 amino acid residues, and the number of alanine residues with respect to the total number of amino acid residues in the (A)motif is 80% or more. REP represents an amino acid sequence consisting of 10 to 200 amino acid residues. m represents an integer of 10 to 300. The plurality of (A)motifs may be the same amino acid sequence or different amino acid sequences. A plurality of REPs may be the same amino acid sequence or different amino acid sequences.]

Modified fibroin

The present invention provides a modified fibroin fiber having a shrinkage history of being irreversibly shrunk after spinning, the modified fibroin fiber containing modified fibroin, wherein a fiber diameter of a raw material fiber before being irreversibly shrunk exceeds 25 μm.

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Tsuruoka, Japan

Shota Togashi