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Characterization of a phosphoprotein associated with the SS-B/La nuclear antigen in adenovirus-infected and uninfected KB cells.

机译:腺病毒感染和未感染的KB细胞中与SS-B / La核抗原相关的磷蛋白的表征。

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摘要

We have employed sera from patients with autoimmune disease to characterize the nuclear SS-B/La antigen in uninfected and adenovirus-infected KB cells. A 45,000-dalton phosphorylated polypeptide was specifically precipitated with anti-SS-B sera, and the level of phosphorylation was increased after infection. The increased phosphorylation appears to occur at the same amino acid residues phosphorylated in uninfected cells and results from increased phosphorylating activity rather than from altered enzyme specificity. A competition experiment between infected and uninfected cell extracts indicates that the antigen in the infected cell binds more strongly to SS-B/La antibodies. Fragments of adenovirus-induced virus-associated RNA as well as intact molecules complex with SS-B/La antigen and are immune precipitated with autoimmune sera.
机译:我们采用了自身免疫性疾病患者的血清来表征未感染和腺病毒感染的KB细胞中的核SS-B / La抗原。 45,000道尔顿的磷酸化多肽被抗SS-B血清特异性沉淀,感染后磷酸化水平增加。磷酸化的增加似乎发生在未感染细胞中被磷酸化的相同氨基酸残基上,这是由于磷酸化活性增加而不是酶特异性改变所致。感染和未感染细胞提取物之间的竞争实验表明,感染细胞中的抗原与SS-B / La抗体的结合更牢固。腺病毒诱导的病毒相关RNA片段以及完整的分子与SS-B / La抗原复合,并通过自身免疫血清免疫沉淀。

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