Is ABP1 an Auxin Receptor Yet？
Is ABP1 an Auxin Receptor Yet？作者机构：Center for Plant Cell Biology Department of Botany and Plant Sciences University of California Riverside CA 92521 USA
出 版 物：《Molecular Plant》 (分子植物（英文版）)
年 卷 期：2011年第4卷第4期
页 面：635-640页
核心收录：
学科分类：0710[理学-生物学] 071010[理学-生物化学与分子生物学] 081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 09[农学] 0901[农学-作物学] 0902[农学-园艺学] 090202[农学-蔬菜学]
基 金：US National Institute of General Medical Sciences
主 题：Hormonal regulation hormone biology receptors signal transduction cell signaling.
摘 要：AUXIN BINDING PROTEIN 1 （ABP1） has long been proposed as an auxin receptor to regulate cell expansion. The embryo lethality of ABP1-null mutants demonstrates its fundamental role in plant development, but also hinders investigation of its involvement in post-embryonic processes and its mode of action. By taking advantage of weak alleles and inducible systems, several recent studies have revealed a role for ABP1 in organ development, cell polarization, and shape formation. In addition to its role in the regulation of auxin-induced gene expression, ABP1 has now been shown to modulate non-transcriptional auxin responses. ABP1 is required for activating two antagonizing ROP GTPase signaling pathways involved in cytoskeletal reorganization and cell shape formation, and participates in the regulation of clathrinmediated endocytosis to subsequently affect PIN protein distribution. These exciting discoveries provide indisputable evidence for the auxin-induced signaling pathways that are downstream of ABP1 function, and suggest intriguing mechanisms for ABPl-mediated polar cell expansion and spatial coordination in response to auxin.
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