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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Tyrosine phosphorylation in plant cell signaling
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Tyrosine phosphorylation in plant cell signaling

机译：植物细胞信号转导中酪氨酸磷酸化

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摘要

Reversible protein phosphorylation is the most common mechanism for cellular regulation in eukaryotic systems. Studies have demonstrated that serine/ threonine phosphorylation plays a key role in the regulation of plant growth and development. On the other hand, tyrosine phosphorylation, despite its overwhelming importance in animals, has been largely neglected because a typical tyrosine kinase was not found in plants. Recent studies have characterized several protein tyrosine phosphatases (PTPs) from Arabidopsis and other species. Furthermore, a diverse group of about 20 genes encoding putative tyrosine phosphatases have been identified from the Arabidopsis genome, implying that tyrosine phosphorylation and dephosphor-ylation may serve important functions in plant biology. It is timely and exciting to learn in this issue of PNAS that tyrosine phosphatase activity is involved in the regulation of stomatal movement, a highly regulated process pivotal for plant survival. Finding a role for tyrosine phosphatases in stomatal regulation provides critical evidence that tyrosine phosphatases not only exist but also play an important role in higher plants. This work, together with those of others, begins to modify the earlier tenets on tyrosine phosphorylation in plant cell signaling and regulation.
机译：可逆蛋白的磷酸化是真核系统中细胞调节的最常见机制。研究表明，丝氨酸/苏氨酸磷酸化在调节植物生长发育中起关键作用。另一方面，尽管酪氨酸磷酸化在动物中具有极为重要的地位，但由于在植物中未发现典型的酪氨酸激酶，因此已被很大程度上忽略。最近的研究已经表征了来自拟南芥和其他物种的几种蛋白质酪氨酸磷酸酶（PTP）。此外，已经从拟南芥基因组中鉴定出大约20个编码推定酪氨酸磷酸酶的基因，这暗示酪氨酸磷酸化和去磷酸化可能在植物生物学中发挥重要作用。在本期PNAS中了解酪氨酸磷酸酶活性与气孔运动的调节有关，这是及时而令人兴奋的，气孔运动是植物生存的关键过程。发现酪氨酸磷酸酶在气孔调节中的作用提供了关键证据，证明酪氨酸磷酸酶不仅存在，而且在高等植物中也起着重要作用。这项工作与其他工作一起，开始修改植物细胞信号传导和调控中酪氨酸磷酸化的早期信条。

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