The maize transfer cell-specific type-A response regulator ZmTCRR-1 appears to be involved in intercellular signalling
The maize transfer cell-specific type-A response regulator ZmTCRR-1 appears to be involved in intercellular signalling
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DOI：
10.1111/j.1365-313x.2006.02848.x
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发表时间：
2006-10-01
期刊：
影响因子：
7.2
通讯作者：
Hueros, Gregorio
中科院分区：
文献类型：
--
作者：
Muniz, Luis M.;Royo, Joaquin;Hueros, Gregorio
反应调节因子是存在于细菌、酵母和植物中的信号转导分子，作为环境挑战的继电器。本文报道了一个编码a型反应调节蛋白成员的玉米基因ZmTCRR-1的特征。该基因仅在授粉后8 ~ 14天的胚乳转移细胞层表达，此时转移细胞分化最为活跃。ZmTCRR-1的启动子在异源系统中被转移细胞特异性转录因子ZmMRP-1强烈反激活。ZmTCRR-1蛋白不仅存在于传递细胞层，而且存在于胚乳深处的导电组织中，那里没有该基因的转录。这表明双组分系统可能参与细胞间信号传递，这与通常认为这些系统只参与细胞自主通路的观点相反。
Response regulators are signal-transduction molecules present in bacteria, yeast and plants, acting as relays for environmental challenges. This paper reports the characterization of a Zea mays gene, ZmTCRR-1, that codes for a member of the type-A response regulator class of proteins. The gene was found to be expressed exclusively in the endosperm transfer-cell layer 8-14 days after pollination, when transfer-cell differentiation is most active. The promoter of ZmTCRR-1 was strongly transactivated in heterologous systems by the transfer cell-specific transcription factor ZmMRP-1. The ZmTCRR-1 protein was detected not only in the transfer-cell layer, but also in the conductive tissue deep inside the endosperm, where there is no transcription of the gene. This suggests that two-component systems might be involved in intercellular signal transmission, in contrast to the generally held belief that these systems are involved only in cell-autonomous pathways.