SIK3 (QSK) is a serine/threonine-protein kinase, belongs to QIK subfamily. The phosphorylation of SIK3 by LKB1 through the 14-3-3 binding enhances its catalytic activity and leads its localization to punctate structures within the cytoplasm. Overexpression of SIK3 promotes G1/S cell cycle progression with ovarian cancer. There are two sites (H331L and A1103V) were mutated at significant frequency in breast cancer. SIK3 is a novel tumor-associated antigen (TAA). Recombinant human SIK3 (1-307) was expressed by baculovirus in Sf9 insect cells using an N-terminal GST tag.

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