Transcription activating property of autoantigen SG2NA and modulating effect of WD-40 repeats.

Transcription activating property of autoantigen SG2NA and modulating effect of WD-40 repeats.
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自身抗原 SG2NA 的转录激活特性和 WD-40 重复序列的调节作用。

DOI:
10.1006/excr.2001.5320
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发表时间:
2001
期刊:
Experimental cell research.
影响因子:
--
通讯作者:
Tan,EM
Tan,EM
中科院分区:
--
文献类型:
--
作者:
Zhu,W;Chan,EK;Li,J;Hemmerich,P;Tan,EM

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细胞内蛋白的自身抗体已在各种癌症患者的血清中检测到。利用膀胱癌和肺癌患者的自身抗体分离核自身抗原SG2NA (S, G2期核抗原),其表达在细胞周期的S期和G2期增强。分子克隆显示,SG2NA的c端区域包含6个WD-40重复序列,这些基序存在于一个具有不同功能的蛋白质大家族中。我们发现SG2NA的n端区域(aa 1-391)在酵母和哺乳动物细胞中都是一个强大的转录激活因子。相反,c端WD-40重复序列对转录激活有抑制作用。我们用酵母Met30和Cdc4的WD-40重复序列替换SG2NA的WD-40重复序列进行了分子交换实验,结果表明Met30和Cdc4的WD-40重复序列都具有转录抑制功能。SG2NA WD-40重复序列也能够抑制GAL4-VP16嵌合体的基础水平转录和反激活功能。这些观察结果表明,一些WD-40重复序列可能作为其功能之一,对其自身和其他蛋白质的生物活性具有负调控作用。
Autoantibodies to intracellular proteins have been detected in sera of patients with various forms of cancer. Nuclear autoantigen SG2NA (S, G2 phase nuclear antigen) was isolated using autoantibodies from a patient with bladder and lung cancers and its expression is enhanced in the S and G2 phases of the cell cycle. Molecular cloning revealed that the C-terminal region of SG2NA contains six WD-40 repeats, motifs that are present in a large family of proteins with diverse functions. We show that the N-terminal region of SG2NA (aa 1–391) acted as a strong transcriptional activator in both yeast and mammalian cells. In contrast, the C-terminal WD-40 repeats had an inhibitory effect on transcription activation. We performed molecular swapping experiments by substituting the WD-40 repeats of SG2NA with those of yeast Met30 and Cdc4 and showed that the WD-40 regions from either Met30 or Cdc4 were capable of reproducing transcription repression function. The SG2NA WD-40 repeats were also able to repress basal level transcription and transactivation function of a GAL4–VP16 chimera. These observations suggest that some WD-40 repeats may have, as one of their functions, a negative regulatory role in the biological activities of their own and perhaps other proteins.
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