Identification and purification of a cytosolic phosphotyrosyl protein phosphatase from bovine spleen.
Identification and purification of a cytosolic phosphotyrosyl protein phosphatase from bovine spleen.
复制标题
牛脾细胞质磷酸酪氨酰蛋白磷酸酶的鉴定和纯化。
DOI:
10.1016/0003-2697(87)90469-6
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发表时间:
1987
影响因子:
2.9
通讯作者:
L. Reed
中科院分区:
文献类型:
--
作者:
H. Tung;L. Reed
A protein tyrosine kinase with an apparent Mrof 60,000 was highly purified from bovine spleen and used to phosphorylate poly(Glu,Tyr) (4:1) on tyrosine residues for the study of phosphotyrosyl protein phosphatases from this tissue. About 70% of the phosphotyrosyl protein phosphatase activity in extracts of bovine spleen was adsorbed on DEAE-Sepharose. Chromatography of the eluted phosphotyrosyl protein phosphatases on phosphocellulose indicated the presence of at least two species, one that did not bind to the phosphocellulose and a second species that did bind and was eluted at about 0.5 m NaCl. The phosphatase that did not bind to phosphocellulose was further purified by successive chromatography on poly(l-lysine)-Sepharose, l-tyrosine-agarose, poly(Glu,Tyr)-Sepharose, and Sephacryl S-200. The enzyme had an apparent Mrof 50,000 as estimated by gel filtration and 52,000 as estimated by NaDodSO4-polyacrylamide gel electrophoresis. The phosphatase exhibited a pH optimum of 6.5–7.0, was inhibited by Zn2+and vanadate ions, and was stimulated by EDTA. Sodium fluoride and sodium pyrophosphate, inhibitors of phosphoseryl protein phosphatases, had no effect on the enzyme. Protein inhibitors of type 1 phosphoseryl/threonyl phosphatase were also ineffective.
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DOI:
--
发表时间:
1980
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Levinson,AD;Oppermann,H;Varmus,HE;Bishop,JM
通讯作者:
Bishop,JM
DOI:
--
发表时间:
1984
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Harrison,ML;Low,PS;Geahlen,RL
通讯作者:
Geahlen,RL
影响因子:
3.9
作者:
Chernoff,J;Li,HC
通讯作者:
Li,HC
影响因子:
2.9
作者:
Hörlein,D;Gallis,B;Brautigan,DL;Bornstein,P
通讯作者:
Bornstein,P
DOI:
--
发表时间:
1984
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Braun,S;Raymond,WE;Racker,E
通讯作者:
Racker,E