Binding of the Transcription Factor Interferon Regulatory Factor-1 to the Inducible Nitric-oxide Synthase Promoter*

Binding of the Transcription Factor Interferon Regulatory Factor-1 to the Inducible Nitric-oxide Synthase Promoter*
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转录因子干扰素调节因子 1 与诱导型一氧化氮合酶启动子的结合*

DOI:
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发表时间:
1997
影响因子:
4.8
通讯作者:
T. Evans
T. Evans
中科院分区:
生物学2区
文献类型:
--
作者:
J. Spink;T. Evans

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一氧化氮在各种炎症条件下的产生依赖于酶的合成,诱导型一氧化氮合酶(iNOS)。这种酶的基因受许多炎性细胞因子的调节,包括干扰素-γ。该基因的转录激活依赖于干扰素-γ诱导的转录因子,干扰素调节因子-1(IRF-1)。使用包含核苷酸-979到-881的iNOS基因启动子的99个碱基对片段,这是细胞因子激活基因所必需的区域,我们表明随着添加的IRF-1浓度的增加,单体然后二聚体复合物形式。分子足迹分析表明,该因子最初结合到一个典型的IRF-1网站作为一个单体。然后结合区域在形成二聚体复合物时在5′和3′方向上延伸,并在DNA的小沟中具有额外的接触。IRF-1的第二分子的结合取决于初始结合蛋白的存在。IRF-1形成二聚体复合物的顺序结合以前没有描述过,我们表明,这种二聚体复合物的形成是必要的,在血管平滑肌细胞中的细胞因子的诱导型一氧化氮合酶基因的充分激活。
Nitric oxide production in a variety of inflammatory conditions is dependent on the synthesis of the enzyme, inducible nitric-oxide synthase (iNOS). The gene for this enzyme is regulated by a number of inflammatory cytokines, including interferon-γ. Transcriptional activation of the gene is dependent on the interferon-γ-induced transcription factor, interferon regulatory factor-1 (IRF-1). Using a 99-base pair segment of the iNOS gene promoter encompassing nucleotides −979 to −881, a region essential for gene activation by cytokines, we show that with increasing concentrations of added IRF-1, a monomeric then a dimeric complex form. Molecular footprinting analysis shows that the factor binds initially to a canonical IRF-1 site as a monomer. The region of binding is then extended both in a 5′ and 3′ direction on formation of the dimeric complex, with additional contacts in the minor groove of DNA. Binding of the second molecule of IRF-1 is dependent on the presence of the initial bound protein. Sequential binding of IRF-1 to form a dimeric complex has not been described previously, and we show that formation of this dimeric complex is essential for full activation of the iNOS gene by cytokines in vascular smooth muscle cells.
DOI: 10.1128/mcb.14.2.1322
发表时间: 1994-02-01
影响因子: 5.3
作者:
JOHNSON, DR;POBER, JS
通讯作者: POBER, JS
DOI: 10.1016/s0021-9258(17)36703-0
发表时间: 1994-05
期刊: The Journal of biological chemistry
影响因子: --
作者:
C. Nathan;Q. Xie
通讯作者: C. Nathan;Q. Xie
DOI: 10.1073/pnas.86.24.9936
发表时间: 1989-12-01
影响因子: 11.1
作者:
FUJITA, T;REIS, LFL;VILCEK, J
通讯作者: VILCEK, J
DOI: 10.1093/nar/17.2.723
发表时间: 1989-01
影响因子: 14.9
作者:
F. Vallette;Emmanuelle Mege;A. Reiss;M. Adesnik
通讯作者: F. Vallette;Emmanuelle Mege;A. Reiss;M. Adesnik
DOI: 10.1126/science.7510419
发表时间: 1994-03-18
期刊: SCIENCE
影响因子: 56.9
作者:
KAMIJO, R;HARADA, H;VILCEK, J
通讯作者: VILCEK, J