Functional phylogenetics reveals contributions of pleiotropic peptide action to ligand-receptor coevolution.

Functional phylogenetics reveals contributions of pleiotropic peptide action to ligand-receptor coevolution.
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功能系统发育学揭示多效性肽作用对配体-受体协同进化的贡献

DOI:
10.1038/srep06800
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发表时间:
2014-10-28
期刊:
影响因子:
4.6
通讯作者:
Park Y
Park Y
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Jiang H;Wei Z;Nachman RJ;Adams ME;Park Y

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肽能信号传导的进化伴随着显著程度的配体 - 受体协同进化。人们观察到密切相关的肽信号分子簇可激活相关的受体群,这意味着编码这些配体的基因可能协调一系列功能,这种现象被称为基因多效性。在此我们研究肽基因的多效性作用是否可能影响配体 - 受体协同进化。我们在赤拟谷盗(Tribolium castaneum)中研究了四组以保守的C末端氨基酸序列基序为特征的神经肽及其同源受体:1)心加速肽2b(CAPA);CAPAr,2)焦激肽/滞育激素(PK1/DH);PKr - A, - B,3)焦激肽/信息素生物合成激活激素(PK2/PBAN);PKr - C,以及4)蜕皮触发激素(ETH);ETHr - b。通过在基于细胞的实验中对9种内源性配体进行受体的异源表达来确定配体 - 受体特异性。基于配体 - 受体特异性分析,我们发现ETH对ETHR - b和CAPAr表现出正向多效性,而PK1/DH和CAPA对其各自的原配体受体的选择性比系统发育分析所预测的更高。从受体序列推导的进化树与功能性配体 - 受体特异性之间的差异导致这样的结论:肽基因所表现出的多效性影响配体 - 受体协同进化。
The evolution of peptidergic signaling has been accompanied by a significant degree of ligand-receptor coevolution. Closely related clusters of peptide signaling molecules are observed to activate related groups of receptors, implying that genes encoding these ligands may orchestrate an array of functions, a phenomenon known as pleiotropy. Here we examine whether pleiotropic actions of peptide genes might influence ligand-receptor coevolution. Four test groups of neuropeptides characterized by conserved C-terminal amino acid sequence motifs and their cognate receptors were examined in the red flour beetle (Tribolium castaneum): 1) cardioacceleratory peptide 2b (CAPA); CAPAr, 2) pyrokinin/diapause hormone (PK1/DH); PKr-A, -B, 3) pyrokinin/pheromone biosynthesis activating hormone (PK2/PBAN); PKr-C, and 4) ecdysis triggering hormone (ETH); ETHr-b. Ligand-receptor specificities were established through heterologous expression of receptors in cell-based assays for 9 endogenous ligands. Based on ligand-receptor specificity analysis, we found positive pleiotropism exhibited by ETH on ETHR-b and CAPAr, whereas PK1/DH and CAPA are more highly selective for their respective authentic receptors than would be predicted by phylogenetic analysis. Disparities between evolutionary trees deduced from receptor sequences vs. functional ligand-receptor specificities lead to the conclusion that pleiotropy exhibited by peptide genes influences ligand-receptor coevolution.
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