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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Roles of several domains identified in the primary structure of salt-inducible kinase ( SIK).

Salt-inducible kinase ( SIK), a 776 amino acids-protein, contains a kinase domain in the NH2-terminal 278 amino acid residues, and the biological functions of its COOH-terminal half have yet to be clarified. Here we describe the roles played by several domains in the SIK molecule. K56, an amino acid residue found in a region similar to the ATP-binding loop of other protein kinases, was essential for carrying out the SIKs phosphorylation reaction. An SNF-1 homology domain (SNH), identified at a peptide stretch from the 317th to the 346th residues, and conserved among all the sucrose-nonfermenting-1 protein kinase (SNF-1) family protein kinases, was important to maintain the SIKs protein conformation in the cells. S577, an amino acid residue found in one of three consensus PKA-dependent phosphorylation motifs, was indeed phosphorylated by PKA. The phosphorylated SIK was found to move out of the nucleus to the cytoplasm.[1]


  1. Roles of several domains identified in the primary structure of salt-inducible kinase (SIK). Horike, N., Takemori, H., Katoh, Y., Doi, J., Okamoto, M. Endocr. Res. (2002) [Pubmed]
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