Abstract: A compound that promotes the ubiquitination of a protein comprising the same or substantially the same amino acid sequence as the amino acid sequence shown by SEQ ID NO:1, SEQ ID NO:2 or SEQ ID NO:3 or a partial peptide thereof or a salt thereof, or a salt thereof, a compound that promotes the degradation, by proteasome, of the protein or a partial peptide thereof or a salt thereof, or a salt thereof, and the like can be used as, for example, prophylactic/therapeutic agents for neurodegenerative disease. Also, a protein comprising the same or substantially the same amino acid sequence as the amino acid sequence shown by SEQ ID NO:1, SEQ ID NO:2 or SEQ ID NO:3 or a partial peptide thereof or a salt thereof and the like are useful for screening for a compound having prophylactic/therapeutic action on neurodegenerative disease and the like or a salt thereof.

Abstract: A compound that promotes the ubiquitination of a protein comprising the same or substantially the same amino acid sequence as the amino acid sequence shown by SEQ ID NO:1, SEQ ID NO:2 or SEQ ID NO:3 or a partial peptide thereof or a salt thereof, or a salt thereof, a compound that promotes the degradation, by proteasome, of the protein or a partial peptide thereof or a salt thereof, or a salt thereof, and the like can be used as, for example, prophylactic/therapeutic agents for neurodegenerative disease. Also, a protein comprising the same or substantially the same amino acid sequence as the amino acid sequence shown by SEQ ID NO:1, SEQ ID NO:2 or SEQ ID NO:3 or a partial peptide thereof or a salt thereof and the like are useful for screening for a compound having prophylactic/therapeutic action on neurodegenerative disease and the like or a salt thereof.

Abstract: A protein, a polynucleotide, an antibody of the present invention, etc. are useful as, for example, a diagnostic marker for a neurodegenerative disease and so on. A compound promoting or inhibiting the activity of the protein, a compound promoting or inhibiting the expression of a gene for the above protein, etc., which are obtained by a screening method with the use of the protein, polynucleotide or antibody as described above, are usable as, for example, a prophylactic/therapeutic agent for a neurodegenerative disease and so on.

Abstract: A compound or its salts inhibiting the activity of the protein of the present invention, a compound inhibiting the expression of a gene for the protein, the antisense polynucleotide of the present invention, the antibody of the present invention, and the like can be used as prophylactic/therapeutic agents for neurodegenerative disease, diabetes and the like. A compound or its salts promoting the activity of the protein of the present invention, a compound promoting the expression of a gene for the protein, etc. can be used as prophylactic/therapeutic agents for cancer, rheumatic disease, etc.