The Arabidopsis Tellurite resistance C protein together with ALB3 is involved in photosystem II protein synthesis.

The Arabidopsis Tellurite resistance C protein together with ALB3 is involved in photosystem II protein synthesis.
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拟南芥亚碲酸盐抗性 C 蛋白与 ALB3 一起参与光系统 II 蛋白合成

DOI:
10.1111/tpj.12474
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发表时间:
2014
期刊:
The Plant journal : for cell and molecular biology
影响因子:
--
通讯作者:
Leister D
Leister D
中科院分区:
--
文献类型:
--
作者:
Schneider A;Steinberger I;Strissel H;Kunz HH;Manavski N;Meurer J;Burkhard G;Jarzombski S;Schünemann D;Geimer S;Flügge UI;Leister D

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光系统 II (PSII) 的组装按顺序进行,需要多种辅助蛋白,例如 ALB3 (ALBINO3)。在这里,我们描述了拟南芥拟南芥膜蛋白碲酸盐抗性 C (AtTerC) 在此过程中的作用。 AtTerC 的敲除先前被证明是幼苗致死的。通过在terc-1背景中表达C末端与GFP融合的TerC,可以挽救这种表型,并使用所得的terc-1TerC-GFP线和基于人工miRNA的敲低等位基因(amiR-TerC)来分析TerC功能。在amiR-TerC植物和terc-1TerC-GFP中观察到的叶绿素荧光和类囊体超微结构的变化归因于PSII的缺陷。我们发现这种表型是由于 PSII 核心蛋白从头合成速率降低造成的,但 PSII 生物合成的后续步骤似乎受到的影响较小。酵母双杂交检测表明 TerC 与 PSII 蛋白相互作用。特别是,它与 PSII 组装因子 ALB3 的相互作用已通过免疫共沉淀得到证实。 ALB3 被认为通过与低 PSII 累积 2 (LPA2) 低 PSII 累积 3 (LPA3) 相互作用,协助 CP43 掺入 PSII。表达amiR-TerC的纯合lpa2突变体表现出显着加剧的表型,导致幼苗致死,表明存在累加效应。我们提出了一个模型,其中 TerC 与 ALB3 一起在膜插入步骤中促进类囊体膜蛋白(例如 CP43)的从头合成。
Assembly of photosystem II (PSII) occurs sequentially and requires several auxiliary proteins, such as ALB3 (ALBINO3). Here, we describe the role of theArabidopsis thalianathylakoid membrane protein Tellurite resistance C (AtTerC) in this process. Knockout ofAtTerCwas previously shown to be seedling‐lethal. This phenotype was rescued by expressing TerC fused C–terminally to GFP in theterc–1background, and the resultingterc–1TerC–GFPline and an artificial miRNA‐based knockdown allele (amiR‐TerC) were used to analyze the TerC function. The alterations in chlorophyll fluorescence and thylakoid ultrastructure observed inamiR‐TerCplants andterc–1TerC–GFPwere attributed to defects in PSII. We show that this phenotype resulted from a reduction in the rate ofde novosynthesis of PSII core proteins, but later steps in PSII biogenesis appeared to be less affected. Yeast two‐hybrid assays showed that TerC interacts with PSII proteins. In particular, its interaction with the PSII assembly factor ALB3 has been demonstrated by co‐immunoprecipitation. ALB3 is thought to assist in incorporation of CP43 into PSII via interaction with Low PSII Accumulation2 (LPA2) Low PSII Accumulation3 (LPA3). Homozygouslpa2mutants expressingamiR‐TerCdisplayed markedly exacerbated phenotypes, leading to seedling lethality, indicating an additive effect. We propose a model in which TerC, together with ALB3, facilitatesde novosynthesis of thylakoid membrane proteins, for instance CP43, at the membrane insertion step.
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发表时间: 2003-09-01
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