Abstract: A tyrosine phosphatase sigma (PTPsigma)-Fc fusion protein comprises a PTPsigma-derived protein and an immunoglobulin (Ig)-derived Fc domain, which can inhibit the signal transduction of PTPsigma by blocking the interaction of the extracellular domain of PTPsigma with a ligand. The PTPsigma-Fc fusion protein inhibits PTPsigma-mediated signaling and as such, can promote the growth of blood stem cells, and can be used for preventing or treating PTPsigma-mediated diseases. Controlling the signal transduction of PTPsigma by utilizing interaction between proteins, the PTPsigma-Fc fusion protein can overcome the problems of conventional inhibitors targeting the active site of PTP. In addition, the solubility of the fusion protein in an aqueous solution can be improved by introducing a mutation thereinto, which makes it possible to apply a high dose to the treatment of the human body and animals.

Abstract: A stabilized Ace2 variant has a disulfide bond introduced by substituting cysteine for amino acid residue pairs at specific positions of the Ace2 protein, thereby having excellent stability. The stabilized Ace2 variant exhibits high binding affinity for SARS-CoV-2 virus and excellent stability even in an aqueous solution condition. When the stabilized Ace2 variant is applied to a therapeutic agent for COVID-19, which is the SARS-CoV-2 infectious disease, the shelf stability, in-vivo stability, and therapeutic effect of the therapeutic agent may all be improved. In addition, since it uses the amino acid sequence derived from the receptor for SARS-CoV-2, it may effectively work even against various virus mutant strains.

Abstract: The present invention relates to a pharmaceutical composition comprising a DUSP1 inhibitor. The pharmaceutical composition comprising the DUSP1 inhibitor according to the present invention can solve the problems of inhibitors that target the active site because it inhibits DUSP1 by an allosteric inhibitory mechanism, and is effective for preventing or treating diseases involving DUSP1 enzymes, for example, a cancer such as a liver cancer, a breast cancer and a pancreatic cancer, a hepatitis C, and a depression. In particular, the DUSP1 inhibitor according to the present invention is very effective in treating a depression because it directly acts on neuronal growth.

Abstract: The present invention relates to a pharmaceutical composition comprising a DUSP1 inhibitor. The pharmaceutical composition comprising the DUSP1 inhibitor according to the present invention can solve the problems of inhibitors that target the active site because it inhibits DUSP1 by an allosteric inhibitory mechanism, and is effective for preventing or treating diseases involving DUSP1 enzymes, for example, a cancer such as a liver cancer, a breast cancer and a pancreatic cancer, a hepatitis C, and a depression. In particular, the DUSP1 inhibitor according to the present invention is very effective in treating a depression because it directly acts on neuronal growth.

Abstract: The present invention relates to a method for quantifying protein tyrosine phosphatase (referred as PTP hereinafter) in biosamples, precisely a diagnostic method for disease by quantifying PTP using mass spectrometry and profiling of comparative PTP levels. By quantifying PTP in biosamples and profiling thereof according to the method of the present invention, disease can be diagnosed and diverse disease conditions and health conditions can be confirmed via profiling.

Abstract: Disclosed herein are rhodanine derivatives, a method for the preparation thereof, and a pharmaceutical composition containing the same. The rhodanine derivatives have inhibitory activity against protein phosphatases (PPase) such as PTP1B, Prl-3, LAR, CD45, Cdc25A, Cdc25B, Cdc25C, Yop, PP1 and VHR, and can be applied for the prevention and treatment of PPase-caused diseases, including autoimmune diseases, diabetes, impaired glucose intolerance, insulin resistance, obesity, cancers, etc. when the inhibitory activity thereof is modulated.

Abstract: The present invention relates to a crystal structure of PRL-1 (Phospatase of Regenerating Liver) protein and a method of crystallization thereof. It has been found that the PRL-1 protein has a tertiary structure having 5 strands of beta-sheet surrounded by 6 alpha-helices and well-arranged active site with closed P-loop, and monomers form a trimer through farnesylation site in the C-terminus of said protein. Thus intra-cellular migration and membrane localization can be achieved. The said crystal structure of PRL-1 protein of the present invention is very useful for the development the agent which inhibits carcinogenesis and metastasis of the cancer.

Abstract: The present invention relates to a method for quantifying protein tyrosine phosphatase (referred as PTP hereinafter) in biosamples, precisely a diagnostic method for disease by quantifying PTP using mass spectrometry and profiling of comparative PTP levels. By quantifying PTP in biosamples and profiling thereof according to the method of the present invention, disease can be diagnosed and diverse disease conditions and health conditions can be confirmed via profiling.

Abstract: The present invention relates to protein tyrosine phosphatase (PTP) and a method for preparing the same, precisely, a method for expressing PTP active domain with high activity and stability without help of a fusion protein, by using computer based protein structure prediction technique. PTP prepared by the method of the present invention can be effectively used as a protein for high efficiency drug screening for the development of a novel drug, as an antigen protein for the construction of a selective antibody and as a protein for the studies of PTP structure and functions.

Abstract: The present invention relates to a crystal structure of PRL-1 (Phospatase of Regenerating Liver) protein and a method of crystallization thereof. It has been found that the PRL-1 protein has a tertiary structure having 5 strands of beta-sheet surrounded by 6 alpha-helices and well-arranged active site with closed P-loop, and monomers form a trimer through farnesylation site in the C-terminus of said protein. Thus intra-cellular migration and membrane localization can be achieved. The said crystal structure of PRL-1 protein of the present invention is very useful for the development the agent which inhibits carcinogenesis and metastasis of the cancer.

Abstract: Disclosed herein are rhodanine derivatives, a method for the preparation thereof, and a pharmaceutical composition containing the same. The rhodanine derivatives have inhibitory activity against protein phosphatases (PPase) such as PTP1B, Prl-3, LAR, CD45, Cdc25A, Cdc25B, Cdc25C, Yop, PP1 and VHR, and can be applied for the prevention and treatment of PPase-caused diseases, including autoimmune diseases, diabetes, impaired glucose intolerance, insulin resistance, obesity, cancers, etc. when the inhibitory activity thereof is modulated.