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

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Phosphorylation alters the affinity of high mobility group protein HMG 14 for single-stranded DNA.

The effect of phosphorylation on the affinity of HMG 14 from calf thymus for single-stranded DNA (ssDNA) was studied, using a cyclic GMP-dependent protein kinase from bovine lung and a nuclear protein kinase II from rat liver. When phosphorylated by G-kinase, HMG 14 eluted at 0.27 M NaCl from the ssDNA-column, whereas the native protein eluted at 0.30 M salt concentration. In contrast, phosphorylation by nuclear protein kinase II did not alter dissociation of HMG 14 from ssDNA and the phosphoprotein consequently coeluted with the native HMG 14. Thus, addition of a negative charge by phosphorylation of the Ser-6 residue by G-kinase presumably weakens the interaction between the DNA-binding amino acids of HMG 14 and the negatively charged phosphate groups of DNA.[1]

References

  1. Phosphorylation alters the affinity of high mobility group protein HMG 14 for single-stranded DNA. Palvimo, J., Linnala-Kankkunen, A., Mäenpää, P.H. Biochem. Biophys. Res. Commun. (1985) [Pubmed]
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