KSR stimulates Raf-1 activity in a kinase-independent manner

KSR stimulates Raf-1 activity in a kinase-independent manner
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DOI:
10.1073/pnas.94.24.12792
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发表时间:
1997-11-25
影响因子:
11.1
通讯作者:
Morrison, DK
Morrison, DK
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Michaud, NR;Therrien, M;Morrison, DK

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Ras 激酶抑制因子 (KSR) 是 Ras 依赖性信号通路的进化保守成分。在这里,我们发现在激活的 Ras 存在的情况下,鼠 KSR (mKSR1) 从细胞质易位到质膜。在膜上,mKSR1 通过以不依赖于激酶的方式增强 Raf-1 活性来调节 Ras 信号传导。Raf-1 的激活是由 mKSR1 富含半胱氨酸的 CA3 结构域介导的,并涉及非神经酰胺的洗涤剂不稳定辅因子。这些发现揭示了 Ras 介导的信号转导的另一个调节点,并进一步确定了 mKSR1 在 Raf-1 激活的多步过程中的非催化作用。
Kinase suppressor of Ras (KSR) is an evolutionarily conserved component of Ras-dependent signaling pathways. Here, we find that murine KSR (mKSR1) translocates from the cytoplasm to the plasma membrane in the presence of activated Ras. At the membrane, mKSR1 modulates Ras signaling by enhancing Raf-1 activity in a kinase-independent manner, The activation of Raf-1 is mediated by the mKSR1 cysteine-rich CA3 domain and involves a detergent labile cofactor that is not ceramide, These findings reveal another point of regulation for Ras-mediated signal transduction and further define a noncatalytic role for mKSR1 in the multistep process of Raf-1 activation.