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Evidence that high mobility group protein 17 is not phosphorylated in human colon carcinoma cells.

The high mobility group proteins 14 and 17 were reported previously to be phosphorylated in murine and human tumor cell lines. Recently, it was suggested that subgroups of HMG-14, HMG-14a and 14b, but not HMG-17, were phosphorylated in situ in HeLa cells. In order to definitively determine whether HMG-17 is indeed phosphorylated or whether the protein previously identified as [32P]HMG-17 was a subgroup of HMG-14, we have used the technique of electroblotting in conjunction with an immunochemical procedure utilizing anti-HMG-17 IgG. Our results indicate that HMG-17 was not phosphorylated in human colon carcinoma cell line HT-29 incubated for 18 h with 32Pi, but that HMG-14a and HMG-14b were phosphorylated. In contrast, HMG-14a, -14b and -17 were phosphorylated in vitro in isolated nuclei incubated with [gamma-32P]ATP.[1]

References

  1. Evidence that high mobility group protein 17 is not phosphorylated in human colon carcinoma cells. Chapekar, M.S., Bustin, M., Glazer, R.I. Biochim. Biophys. Acta (1985) [Pubmed]
 
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