PRKX, a Novel cAMP-Dependent Protein Kinase Member, Plays an Important Role in Development.

The human protein kinase X gene (PRKX) and cAMP-dependent protein kinase are both c-AMP-dependent serine/threonine protein kinases within the protein kinase AGC subgroup. Of all the protein kinases in this group, PRKX is the least studied. PRKX has been isolated from patients with chondrodysplasia punctate and is involved in numerous processes, including sexual differentiation and fertilization, normal kidney development and autosomal dominant polycystic kidney disease (ADPKD), blood maturation, neural development, and angiogenesis in vitro. Although the role of PRKX in development and disease has been reported recently, the underlying mechanism of PRKX activity is largely unknown. In addition, based on the expression pattern of PRKX and the extensive role of in disease and development, PRKX might have additional crucial functions that have not been addressed in the literature. In this review, we summarize the characteristics and developmental functions of PRKX that have been reported by recent studies. In particular, we elucidate the structural and functional differences between PRKX and as well as the possible roles of PRKX in development and related diseases. Finally, we propose future studies that could lead to important discoveries of more PRKX functions and the underlying mechanisms involved.

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