Screening Method for Client Protein-Protecting Protein, and Physiologically Active Protein-Stabilizing Protein and Pharmaceutical Composition Comprising Said Protein

An agent for stabilizing a physiologically active protein comprising a protein selected from the group consisting of the following (a), (b), (c), (d) and (e):

• (a) a protein having any one of amino acid sequences of SEQ ID NOs:
• 1 to 6;
• (b) a protein having an amino acid sequence obtained by shuffling any one of amino acid sequences of SEQ ID NOs:
• 1 to 6;
• (c) a protein having a fragment sequence of any one of amino acid sequences of SEQ ID NOs:
• 1 to 6;
• (d) a protein which satisfies an amino acid residue composition ratio (the amino acid residue composition ratio including a range of ±5%) indicated in Table 1, 2, 3, 4, 5 or 6, and has an amino acid sequence having a length of 43 amino acid residues or more;
• and
• (e) a protein substantially identical with the protein (a), (b), (c) or (d).