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首页> 外文期刊>Journal of Experimental Botany >The rice RING finger E3 ligase, OsHCI1, drives nuclear export of multiple substrate proteins and its heterogeneous overexpression enhances acquired thermotolerance.
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The rice RING finger E3 ligase, OsHCI1, drives nuclear export of multiple substrate proteins and its heterogeneous overexpression enhances acquired thermotolerance.

机译:水稻的无名指E3连接酶OsHCI1可以驱动多种底物蛋白的核输出,并且其异质的过表达增强了获得的耐热性。

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摘要

Thermotolerance is very important for plant survival when plants are subjected to lethally high temperature. However, thus far little is known about the functions of RING E3 ligase in response to heat shock in plants. This study found that one rice gene encoding the RING finger protein was specifically induced by heat and cold stress treatments but not by salinity or dehydration and named it OsHCI1 (Oryza sativa heat and cold induced 1). Subcellular localization results showed that OsHCI1 was mainly associated with the Golgi apparatus and moved rapidly and extensively along the cytoskeleton. In contrast, OsHCI1 may have accumulated in the nucleus under high temperatures. OsHCI1 physically interacted with nuclear substrate proteins including a basic helix-loop-helix transcription factor. Transient co-overexpression of OsHCI1 and each of three nuclear proteins showed that their fluorescent signals moved into the cytoplasm as punctuate formations. Heterogeneous overexpression of OsHCI1 in Arabidopsis highly increased survival rate through acquired thermotolerance. It is proposed that OsHCI1 mediates nuclear-cytoplasmic trafficking of nuclear substrate proteins via monoubiquitination and drives an inactivation device for the nuclear proteins under heat shock.
机译:当植物遭受致命高温时,耐热性对于植物存活非常重要。然而,到目前为止,关于环E3连接酶响应植物热激的功能的了解还很少。这项研究发现,一种编码RING指蛋白的水稻基因是通过热和冷胁迫处理而特异性诱导的,而不是通过盐分或脱水诱导的,并将其命名为OsHCI1(水稻热和冷诱导的1)。亚细胞定位结果表明,OsHCI1主要与高尔基体有关,并沿细胞骨架快速而广泛地移动。相反,在高温下,OsHCI1可能已经积累在细胞核中。 OsHCI1与包括基本螺旋-环-螺旋转录因子的核底物蛋白发生物理相互作用。 OsHCI1和三种核蛋白中的每一种的瞬时共过表达表明,它们的荧光信号以点状形成的形式移入细胞质。通过获得性耐热性,拟南芥中OsHCI1的异类过表达大大提高了存活率。提议OsHCI1通过单泛素化介导核底物蛋白的核质转移,并在热激下驱动核蛋白的失活装置。

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