Daicel Corporation

Kagoshima University

Kyoto Institute of Technology

National University Corporation Kyoto Institute of Technology

Seiichi Uchimura

Yuji Ito

Yoichi Kumada

Hiromichi Okura

Yuya Hasegawa

The purpose of the present invention is to provide a solid-phase carrier on which an IgG-binding peptide is immobilized, the peptide being usable for IgG purification, having resistance to repeated washing with an alkaline solution after IgG purification, and having a high binding affinity for IgG. Specifically, the present invention relates to a solid-phase carrier on which an IgG-binding peptide is immobilized, wherein the two cysteine residues on the outside of the peptide are linked as shown in the following formula: (in the formula, the upper cysteine residue is on the N-terminal side of the peptide, and the lower cysteine residue is on the C-terminal side of the peptide).

Solid-phase carrier including IgG-binding peptide, and IgG separation method

Provided is a separating agent that does not have a significantly reduced dynamic binding capacity (DBC) to a target substance even when the separating agent is continually CIP-treated under alkaline pH conditions. The separating agent includes a carrier and a protein, wherein the protein is a given protein, and a surface of the carrier and a lysine residue in the protein are bound by a chemical bond.

Separating agent

Provided is a separating agent with an improved dynamic binding capacity (DBC) to a target substance. The separating agent includes a carrier and a protein, wherein the protein is a given protein, and a surface of the carrier and added lysine residues in the protein are bound by chemical bonds.

An object of the present invention is to provide a method by which a peptide having a specific binding capability that can be used for purification of a target molecule can be produced at a low cost, and specifically relates to a peptide fusion protein including one or more peptides having specific binding capability and a scaffold protein, the peptide being inserted into the amino acid sequence of the scaffold protein directly or via a peptide linker, and/or being linked to the N-terminal and/or C-terminal of the scaffold protein.

Peptide fusion protein

The present invention provides an IgG-binding peptide which can be used for the purification of IgG and has excellent stability, e.g., alkali stability. The present invention also provides a method for purifying IgG using the IgG-binding peptide. Specifically, the present invention relates to a solid-phase support including an IgG-binding peptide, an IgG separation column including the solid-phase support, a kit including the solid-phase support or the column, and a method for purifying IgG using the solid-phase support or the column.

Solid-phase support comprising IgG-binding peptide, and method for separating IgG

An object of the present invention is to provide a separation agent for separating a human serum-derived IgG polyclonal antibody. This object is achieved by a separation agent for separating a human serum-derived IgG polyclonal antibody, the separation agent including: a carrier; and a single-chain antibody which has a dissociation constant for a human serum-derived IgG polyclonal antibody of not more than 3.0&#xd7;10M and which binds to the surface of the carrier via a chemical bond.

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Hyogo, Japan

Seiichi Uchimura