Serine/threonine-protein kinase ULK3

Definition:

Serine/threonine protein kinase that acts as a regulator of Sonic hedgehog (SHH) signaling and autophagy. Acts as a negative regulator of SHH signaling in the absence of SHH ligand: interacts with SUFU, thereby inactivating the protein kinase activity and preventing phosphorylation of GLI proteins (GLI1, GLI2 and/or GLI3). Positively regulates SHH signaling in the presence of SHH: dissociates from SUFU, autophosphorylates and mediates phosphorylation of GLI2, activating it and promoting its nuclear translocation. Phosphorylates in vitro GLI2, as well as GLI1 and GLI3, although less efficiently. Also acts as a regulator of autophagy: following cellular senescence, able to induce autophagy.

References:

[1]. Andrew R J Young, et al. Autophagy mediates the mitotic senescence transition. Genes Dev. 2009 Apr 1;23(7):798-803. [Content Brief]

[2]. Alla Maloverjan, et al. Dual function of UNC-51-like kinase 3 (Ulk3) in the Sonic hedgehog signaling pathway. J Biol Chem. 2010 Sep 24;285(39):30079-90. [Content Brief]

[3]. Alla Maloverjan, et al. Identification of a novel serine/threonine kinase ULK3 as a positive regulator of Hedgehog pathway. Exp Cell Res. 2010 Feb 15;316(4):627-37. [Content Brief]

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