Abstract: A protein fiber having a crimp property, such that the protein fiber crimps in response to a stimulus, is immersed in a solution of protein having a different composition from the protein fiber. The protein fiber treated with the different protein composition is infiltrated into the protein and the protein fiber is made to crimp.

Abstract: The present invention relates to a highly contracted artificial fibroin fiber including a modified fibroin, in which a contraction percentage defined by the following equation exceeds 7%.

Abstract: Disclosed is a molded article including a modified fibroin and a water resistance-imparting material. The modified fibroin and the water resistance-imparting material may be covalently bonded.

Abstract: The present invention relates to a highly contracted artificial fibroin fiber including a modified fibroin, in which a contraction percentage defined by the following equation exceeds 7%.

Abstract: Disclosed is an expression cassette comprising, in a 5? to 3? direction of a sense strand, a promoter, and a first nucleic acid, a terminator and a second nucleic acid operably linked to the promoter, wherein the first nucleic acid and the second nucleic acid each contain at least one gene.

Abstract: The present invention relates to a meat-like food composition containing: at least one raw material selected from the group consisting of a meat raw material and a meat substitute composition raw material; and a sheet containing a purified protein.

Abstract: An object of the present invention is to provide a nonwoven fabric that makes it difficult to diffuse liquid in a plane direction and can absorb and transmit liquid in a spot manner, that is, a nonwoven fabric excellent in so-called spot absorbability. The nonwoven fabric according to the present invention is formed by mixing an artificial protein fiber and a hydrophobic synthetic fiber.

Abstract: The present invention relates to a modified fibroin including a domain sequence represented by Formula 1: [(A)nmotif-REP]m or Formula 2: [(A)nmotif-REP]m?(A)n motif, in which the domain sequence has an amino acid sequence with a reduced content of a glutamine residue equivalent to an amino acid in which one or a plurality of glutamine residues in REP are deleted or substituted with other amino acid residues, as compared with a naturally occurring fibroin.

Abstract: The present invention relates to a method of preparing a gene cluster construct including a plurality of genes encoding a multi-modular biosynthetic enzyme, the method including (A) a step of preparing a plurality of DNA fragments which are capable of reconstructing the gene cluster construct and have structures that can be ligated to each other and (B) a step of ligating the plurality of DNA fragments prepared in the step (A) to each other by mixing the plurality of DNA fragments in a solution to obtain the gene cluster construct.

Abstract: The present invention relates to a method for preparing a plasmid containing DNA that encodes a Type I polyketide synthase (PKS), the method including a step of introducing a DNA construct containing tandem repeats of DNA that encodes a PKS into a Bacillus subtilis competent cell.

Abstract: A polar solvent solution of the present invention is a polar solvent solution in which a solute containing a polyamine acid is dissolved in a polar solvent. The solution has a moisture content of less than 5 mass % based on 100 mass % of the solution. A method for producing a polar solvent solution of the present invention includes changing a moisture content of the solution to adjust the viscosity of the solution. Further, another method for producing a polar solvent solution includes reducing a moisture content of the solution to increase the viscosity of the solution. Thus, the present invention provides a polar solvent solution that enables stable spinning and casting without lowering its viscosity when used as dopes for spinning, film, etc., and methods for producing the same.

Abstract: An aspect of the present disclosure provides a synthetic polymer containing a first segment containing a polypeptide skeleton and one or a plurality of second segments bonded directly to the first segment, in which the second segment contains a molecular group having a plasticizing function for the polypeptide skeleton.

Abstract: To provide a meat substitute composition having a texture and sensory properties closer to those of real meat than a meat substitute composition in the related art, the present disclosure provides meat substitute composition containing a polypeptide that satisfies the following (1) or (2): (1) number of amino acid residues is 150 or more, an alanine residue content is 12 to 40%, and a glycine residue content is 11 to 55%; or (2) an amino acid residue content of at least one type selected from the group consisting of serine, threonine, and tyrosine, an alanine residue content, and a glycine residue content account for 56% or more altogether.

Abstract: Provided is a fiber for rubber reinforcement that can be produced using a bio-derived raw material and hardly breaks even when compounded with a rubber material. A first fiber for rubber reinforcement uses a protein fiber containing a hydrophobic protein. A second fiber for rubber reinforcement uses a protein fiber having an initial tensile modulus of elasticity of 2.0 GPa or more when wet. These fibers for rubber reinforcement preferably have a coating layer made of a water-based adhesive composition on the surface thereof.

Abstract: An object of the present invention is to provide a method capable of producing a protein fiber in which shrinkage at the time of first contact with moisture after production is more reliably suppressed and generation of crimp is also suppressed. A method for producing a protein fiber according to the present invention includes: a pre-shrinking step of shrinking a protein fibril in a relaxed state after drawing and before being wound; a winding step of winding the protein fibril subjected to the pre-shrinking step to obtain a wound product; and a post-shrinking step of shrinking the protein fibril subjected to the winding step in a relaxed state.

Abstract: An object of the present invention is to provide an agent for imparting a cool touch feeling property and a water-absorbing and quick-drying property. The agent for imparting a cool touch feeling property and a water-absorbing and quick-drying property contains a modified fibroin as an active ingredient.

Abstract: To provide a muscle tissue-regenerating agent containing a fibroin protein. A muscle tissue-regenerating agent containing a modified fibroin protein.

Abstract: An object of the present invention is to provide a protein adhesive containing a protein, a joined body, and a method for producing the same. The protein adhesive of the present invention contains a protein of 50 KDa or less. The joined body of one embodiment is a joined body including a first object, a second object, and an adhesive layer interposed between the first object and the second object, in which the first object and the second object are joined by the adhesive layer, and the adhesive layer is an adhesive layer formed of a protein adhesive containing a protein of 50 KDa or less.

Abstract: An object of the present invention is to provide a method for advantageously producing a protein molded article which can solve a problem caused by esterification of a hydroxyl group contained in a protein while maintaining a sufficient strength. A method for producing a protein molded article according to the present invention includes a step of bringing a raw material molded article containing a protein in which a hydroxyl group is esterified into contact with an acidic or basic medium in a state of applying a tensile force, thus hydrolyzing an ester group.

Abstract: An object of the present invention is to provide an artificial fur which has a sufficient moisture-absorbing property and reduces energy required for the manufacture. The artificial fur according to this invention includes an artificial protein fiber.