THE T-CELL TRANSCRIPTION FACTOR NFAT(P) IS A SUBSTRATE FOR CALCINEURIN AND INTERACTS WITH FOS AND JUN

THE T-CELL TRANSCRIPTION FACTOR NFAT(P) IS A SUBSTRATE FOR CALCINEURIN AND INTERACTS WITH FOS AND JUN
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DOI:
10.1038/365352a0
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发表时间:
1993-09-23
期刊:
影响因子:
64.8
通讯作者:
RAO, A
RAO, A
中科院分区:
综合性期刊1区
文献类型:
--
作者:
JAIN, JN;MCCAFFREY, PG;RAO, A

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活化 T 细胞中淋巴因子基因的转录受到免疫抑制剂环孢菌素 A 和 FK506 的抑制,它们通过阻断钙调神经磷酸酶 1-3 的磷酸酶活性来发挥作用。 NFAT 是白细胞介素 2 基因转录所需的 DNA 结合蛋白,是钙调神经磷酸酶、环孢菌素 A 和 FK506(4-11) 的潜在靶标。 NFAT 包含一个亚基 (NFAT(p)),它存在于未刺激的 T 细胞中,并与激活的 T 细胞核中的 Fos 和 Jun 蛋白形成复合物 9,11。在这里,我们报道 NFAT(p) 是一种 DNA 结合磷蛋白,相对分子质量约为 120,000,并且是体外钙调神经磷酸酶的底物。纯化的 NFAT(p) 与重组 Jun 同二聚体或 Jun-Fos 异二聚体形成 DNA-蛋白质复合物; Fos 和 Jun 的 DNA 结合域对于 NFAT(p)-Fos-Jun-DNA 复合物的形成至关重要。淋巴特异性因子 NFAT(p) 与普遍存在的转录因子 Fos 和 Jun 之间的相互作用为白细胞介素 2 基因转录的组合调节提供了一种新机制,该机制整合了 T 细胞激活的钙依赖性和蛋白激酶 C 依赖性途径。
TRANSCRIPTION of lymphokine genes in activated T cells is inhibited by the immunosuppressive agents cyclosporin A and FK506, which act by blocking the phosphatase activity of calcineurin1-3. NFAT, a DNA-binding protein required for interleukin-2 gene transcription, is a potential target for calcineurin, cyclosporin A and FK506(4-11). NFAT contains a subunit (NFAT(p)) which is present in unstimulated T cells and which forms a complex with Fos and Jun proteins in the nucleus of activated T cells9,11. Here we report that NFAT(p) is a DNA-binding phosphoprotein of relative molecular mass approximately 120,000 and is a substrate for calcineurin in vitro. Purified NFAT(p) forms DNA-protein complexes with recombinant Jun homodimers or Jun-Fos heterodimers; the DNA-binding domains of Fos and Jun are essential for the formation of the NFAT(p)-Fos-Jun-DNA complex. The interaction between the lymphoid-specific factor NFAT(p) and the ubiquitous transcription factors Fos and Jun provides a novel mechanism for combinatorial regulation of interleukin-2 gene transcription, which integrates the calcium-dependent and the protein-kinase C-dependent pathways of T-cell activation.