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Tyrosine phosphorylation is negatively regulated by the protein-tyrosine phosphatases (PTPs). In order to find the physiological substrates of these enzymes, diverse PTP mutants that do not possess any catalytic activities but appear to bind tightly to their tyrosine phosphorylated substrates have been designed. Hence, they can be used as tools to pull out their respective substrates from heterogeneous...
The transmembrane forms of the protein tyrosine phosphatases (PTPs) are evolutionarily conserved and have been implicated in diverse cellular and developmental functions. Due to their structure, these enzymes are known as “receptor-like” PTPs (RPTPs), yet most remain as orphan receptors with no proven ligands yet. The question of whether or not such ligands exist is critical, because RPTP regulation...
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