Abstract: Provided is a novel protein phosphatase inhibitor. The protein phosphatase inhibitor contains, as an active ingredient, a silicon compound represented by the following general formula (1) or a salt thereof, wherein R1, R2 and R3 are the same or different and represent a hydrocarbon group having 1 to 12 carbon atoms; X represents an optionally substituted hydrocarbon group having 3 to 36 carbon atoms or an optionally substituted heterocyclic group; and n represents an integer of 0 or 1.

Abstract: Provided is a novel protein phosphatase inhibitor. The protein phosphatase inhibitor contains, as an active ingredient, a silicon compound represented by the following general formula (1) or a salt thereof, wherein R1, R2 and R3 are the same or different and represent a hydrocarbon group having 1 to 12 carbon atoms; X represents an optionally substituted hydrocarbon group having 3 to 36 carbon atoms or an optionally substituted heterocyclic group; and n represents an integer of 0 or 1.

Abstract: The present invention provides a monoclonal antibody recognizing modification after translation of p53 in a manner specific to a modification site, an antibody microarray comprising the antibody immobilized on a substrate, etc. Disclosed is a monoclonal antibody which reacts specifically with a peptide consisting of an amino acid sequence of at least 6 consecutive amino acids containing a predetermined amino acid residue of the amino acid sequence represented by SEQ ID NO: 1, wherein the amino acid residue is phosphorylated or acetylated, or with a peptide having one to several arbitrary amino acids added to the above peptide, but does not react with the above peptide which is not phosphorylated or acetylated.

Abstract: The present invention provides a monoclonal antibody recognizing modification after translation of p53 in a manner specific to a modification site, an antibody microarray comprising the antibody immobilized on a substrate, etc. Disclosed is a monoclonal antibody which reacts specifically with a peptide consisting of an amino acid sequence of at least 6 consecutive amino acids containing a predetermined amino acid residue of the amino acid sequence represented by SEQ ID NO: 1, wherein the amino acid residue is phosphorylated or acetylated, or with a peptide having one to several arbitrary amino acids added to the above peptide, but does not react with the above peptide which is not phosphorylated or acetylated.

Abstract: The present invention provides methods for generating phosphorylation site-specific immunological reagents. More specifically, a phosphopeptide mimetic is incorporated into a polypeptide in place of a phosphorylated amino acid. The polypeptide is used as antigen by standard methods to generate either monoclonal or polyclonal antibodies which cross-react with the naturally phosphorylated polypeptide. The phosphopeptide mimetic preferably contains a non-hydrolyzable linkage from the appropriate carbon atom of the amino acid residue to a phosphate group. A preferred linkage is a CF2 group. Such a linkage is used to generate the phosphoserine mimetic F2Pab, which is incorporated into a polypeptide sequence derived from p53 to produce antibodies which recognize a specific phosphorylation state of p53. A CF2 group linkage is also used to produce the phosphothreonine mimetic F2Pmb, and to produce the phosphotyrosine mimetic, F2Pmp.