Phosphorylation of human high mobility group N1 protein by protein kinase CK2.
High mobility group (HMG) N1 protein, formerly known as HMG 14, is a member of the chromosomal HMG protein family. Protein kinase CK2 was previously reported to be able to phosphorylate bovine HMGN1 in vitro; Ser89 and Ser99, corresponding to Ser88 and Ser98 in human HMGN1, were shown to be major and minor recognition sites, respectively. In this report, we employed mass spectrometry and examined both the extent and the sites of phosphorylation in HMGN1 protein catalyzed by recombinant human protein kinase CK2. We found that five serine residues, i.e., Ser6, Ser7, Ser85, Ser88, and Ser98, in HMGN1 can be phosphorylated by the kinase in vitro. All five sites were previously shown to be phosphorylated in MCF-7 human breast cancer cells in vivo. Among these five sites, Ser6, Ser7, and Ser85 were new sites of phosphorylation induced by protein kinase CK2 in vitro.
Jiang
Xinzhao Grace
XG
Department of Chemistry-027, University of California, Riverside, 92521-0403, USA.
Wang
Yinsheng
Y
D000595:Amino Acid Sequence; D001665:Binding Sites / Q000235:genetics; D047390:Casein Kinase II / Q000235:genetics / Q000378:metabolism*; D045744:Cell Line, Tumor; D024241:HMGN1 Protein / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D008969:Molecular Sequence Data; D010766:Phosphorylation; D011994:Recombinant Proteins / Q000378:metabolism; D012694:Serine / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
D024241:HMGN1 Protein; D011994:Recombinant Proteins; D012694:Serine; D047390:Casein Kinase II