期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1981
卷号：78
期号：1
页码：41-45
DOI：10.1073/pnas.78.1.41
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：Human cell lines, whether derived from spontaneous tumors or transformed in vitro with simian virus 40, were found to contain a 53,000-dalton phosphoprotein (pp53) in contrast to normal human cells in which this protein was not detected. Isoelectric focusing showed that pp53 comprised several species in both simian virus 40-transformed and tumor cells. Comparison of the pp53 species from the various cell lines by partial proteolysis showed that they were similar but not identical. Among the 13 tumor cell lines examined, only 1 line, HeLa, did not contain detectable pp53. All the other tumor cell lines contained pp53, and it is suggested that this protein may be associated with their transformed state.
