RAPID PHOSPHORYLATION OF 28-KDA HEAT-SHOCK PROTEIN BY TREATMENT WITH OKADAIC ACID AND PHORBOL ESTER OF BALB/MK-2 MOUSE KERATINOCYTES

被引:15
作者
KASAHARA, K [1 ]
IKUTA, T [1 ]
CHIDA, K [1 ]
ASAKURA, R [1 ]
KUROKI, T [1 ]
机构
[1] UNIV TOKYO,INST MED SCI,DEPT CANC CELL RES,MINATO KU,TOKYO 108,JAPAN
来源
EUROPEAN JOURNAL OF BIOCHEMISTRY | 1993年 / 213卷 / 03期
关键词
D O I
10.1111/j.1432-1033.1993.tb17859.x
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Protein phosphorylation by okadaic acid and 12-O-tetradecanoylphorbol-13-acetate (TPA) was examined using quiescent cultures of BALB/MK-2, a cell line derived from mouse epidermal keratinocytes. Treatment with okadaic acid caused rapid phosphorylation of five proteins with molecular masses of 65, 55, 50, 28 and 15 kDa (p65, p55, p50, p28, p15, respectively) while TPA caused rapid phosphorylation of five proteins with molecular masses of 80, 70, 40, 34 and 28 kDa (p80, p70, p40, p34, p28, respectively). In the present study, we examined p28, a common target protein of okadaic acid and TPA. The phosphorylation of p28 increased depending on time of exposure and doses of okadaic acid and TPA. Combined treatment with okadaic acid and TPA resulted in an additive effect. Its position on two-dimensional gel electrophoresis suggested that p28 is the 28-kDa heat-shock protein (HSP28). This possibility was confirmed by migration of p28 with HSP28 and comparative peptide mapping of the two proteins. The phosphoamino-acid residue of phosphorylated HSP28 was serine. In two-dimensional tryptic peptide maps, the same peptides were phosphorylated after treatment with both okadaic acid and TPA.
引用
收藏
页码:1101 / 1107
页数:7
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