Evolution of the Max and Mlx networks in animals.

Evolution of the Max and Mlx networks in animals.
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DOI:
10.1093/gbe/evr082
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发表时间:
2011
影响因子:
3.3
通讯作者:
Atchley WR
Atchley WR
中科院分区:
生物学2区
文献类型:
--
作者:
McFerrin LG;Atchley WR

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转录因子(Transcription Factor,TF)是调控基因表达的重要因子,在细胞过程中发挥重要作用。在本文中,我们专注于并行的最大和Mlx网络的TF,因为他们的关键参与细胞周期调控,增殖,生长,代谢和凋亡。碱性螺旋环螺旋拉链(bHLHZ)结构域介导Max和Mlx网络成员之间的竞争性蛋白质二聚化和DNA结合,形成复杂的细胞调控系统。为了理解这些网络相互作用的重要性,我们确定了动物界Max和Mlx网络蛋白的bHLHZ结构域,并进行了多变量统计分析。Max和Mlx网络蛋白在动物谱系中的存在和保守性源于后生动物的分化,表明这些网络具有古老而重要的功能。bHLHZ域的系统发育分析确定了蛋白质家族之间的明确关系,具有不同的辐射和分歧点。多元判别分析进一步分离出bHLHZ结构域内的特定氨基酸变化,这些变化对蛋白质、家族和网络构型进行分类。这些分析最大和Mlx网络成员提供了一个模型,用于表征的演变的TF参与必要的网络。
Transcription factors (TFs) are essential for the regulation of gene expression and often form emergent complexes to perform vital roles in cellular processes. In this paper, we focus on the parallel Max and Mlx networks of TFs because of their critical involvement in cell cycle regulation, proliferation, growth, metabolism, and apoptosis. A basic-helix-loop-helix-zipper (bHLHZ) domain mediates the competitive protein dimerization and DNA binding among Max and Mlx network members to form a complex system of cell regulation. To understand the importance of these network interactions, we identified the bHLHZ domain of Max and Mlx network proteins across the animal kingdom and carried out several multivariate statistical analyses. The presence and conservation of Max and Mlx network proteins in animal lineages stemming from the divergence of Metazoa indicate that these networks have ancient and essential functions. Phylogenetic analysis of the bHLHZ domain identified clear relationships among protein families with distinct points of radiation and divergence. Multivariate discriminant analysis further isolated specific amino acid changes within the bHLHZ domain that classify proteins, families, and network configurations. These analyses on Max and Mlx network members provide a model for characterizing the evolution of TFs involved in essential networks.
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