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protein tyrosine phosphatase type IVA family Protein tyrosine phosphatases type IVA (PTP-IVa), also known as protein-tyrosine phosphatases of regenerating liver (PRLs) constitute a family of small, prenylated phosphatases that are the most oncogenic of all PTPs. They stimulate progression from G1 into S phase during mitosis and enhances cell proliferation, cell motility and invasive activity, and promotes cancer metastasis. They associate with magnesium transporters of the cyclin M (CNNM) family, which results in increased intracellular magnesium levels that promote oncogenic transformation. Vertebrates contain three members: PRL-1, PRL-2, and PRL-3.
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