Overexpression of small heat shock protein LimHSP16.45 in Arabidopsis enhances tolerance to abiotic stresses.

Overexpression of small heat shock protein LimHSP16.45 in Arabidopsis enhances tolerance to abiotic stresses.
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拟南芥中小热激蛋白 LimHSP16.45 的过度表达增强了对非生物胁迫的耐受性

DOI:
10.1371/journal.pone.0082264
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Liu H
Liu H
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Mu C;Zhang S;Yu G;Chen N;Li X;Liu H

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小分子热激蛋白(smHSPs)在植物防御非生物胁迫中起着重要而广泛的作用。我们从大卫百合(Lilium davidii(E. H.威尔逊)拉菲尔var. Willmottiae),根据其蛋白质分子量,我们将其命名为LimHSP 16.45。在百合和转基因拟南芥中,多种非生物胁迫均可诱导该基因的表达。异源表达增强了后者在高温、高盐和氧化应激下的细胞活力,并在热或盐处理下形成热休克颗粒(HSGs)。酶的分析表明,LimHSP 16.45的过表达与转基因株系中超氧化物歧化酶和过氧化氢酶的更大活性有关。因此,我们得出结论,异源表达可以保护植物免受非生物胁迫,防止不可逆的蛋白质聚集,并通过清除细胞活性氧。
Small heat shock proteins (smHSPs) play important and extensive roles in plant defenses against abiotic stresses. We cloned a gene for a smHSP from the David Lily (Lilium davidii (E. H. Wilson) Raffill var. Willmottiae), which we named LimHSP16.45 based on its protein molecular weight. Its expression was induced by many kinds of abiotic stresses in both the lily and transgenic plants of Arabidopsis. Heterologous expression enhanced cell viability of the latter under high temperatures, high salt, and oxidative stress, and heat shock granules (HSGs) formed under heat or salinity treatment. Assays of enzymes showed that LimHSP16.45 overexpression was related to greater activity by superoxide dismutase and catalase in transgenic lines. Therefore, we conclude that heterologous expression can protect plants against abiotic stresses by preventing irreversible protein aggregation, and by scavenging cellular reactive oxygen species.
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