Purification and Characterization of Mr 43,000 Protein Similar to Mr 25,000 Protein, a Substrate for Protein Ser/Thr Kinases, Identified as a Part of Xenopus lae
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- 作者：Jin Xi ; Isamu Sugimoto ; Satoshi Yoshitome ; Hiroko Yasuda ; Kumiko Ogura ; Nobuhiro Mori ; Zhijun Li ; Susumu Ito ; Eikichi Hashimoto
- 关键词：Amino acid sequence ; phosphorylated protein ; protein processing ; vitellogenin ; Xenopus laevis
- 刊名：Journal of Protein Chemistry
- 出版年：2003
- 出版时间：August, 2003
- 年：2003
- 卷：22
- 期：6
- 页码：571-583
- 全文大小：2,574 KB
文摘
Mr 25,000 protein (pp25), a substrate for protein Ser/Thr kinases, was recently shown to consist of a portion of the Xenopus laevis vitellogenin B1 protein. By Western blot analyses using antibodies against pp25, a minor protein band with Mr 43,000 (pp43) was detected in purified preparations of pp25. In this study, pp43 was highly purified through several column chromatography steps and its protein structure was analyzed. The amino acid sequence of the amino-terminal region of pp43 was the same as that of pp25. pp43 contained about two times more phosphates than pp25. These phosphates in pp43 were more resistant to acid phosphatase attack than those of pp25. pp43 was able to bind to pNiXa, a binding protein of pp25. -chymotryptic digestion generated a common fragment with molecular mass of 23,000 from both pp43 and pp25. These results suggest that pp43 may be a precursor of pp25 generated during processing of vitellogenin B1.