磺基异丙醇二酰基甘油的减量对假海硅藻类囊体膜的影响。

IF 2.1 4区 生物学 Q2 PLANT SCIENCES Photosynthetica Pub Date : 2023-09-05 eCollection Date: 2023-01-01 DOI:10.32615/ps.2023.032
T Liebisch, M Başoglu, S Jäger, C Büchel
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引用次数: 0

摘要

硅藻类囊体含有比维管植物高得多的磺基喹啉二酰基甘油(SQDG),这与硅藻特殊的类囊体结构有关。为了验证这一假设,我们在假海藻中创建了低敲突变体,显示每个细胞SQDG含量降低。令人惊讶的是,不同脂类之间的比例没有变化,表明类囊体脂质的组成受到严格调节。从吸光度光谱看,天线蛋白岩藻黄素-叶绿素蛋白(FCP)较PSII减少,光系统(PS) I较PSII增加。CD光谱显示发色团的堆积更紧密。FCP的减小可能有助于避免激发态能量传递的直径变化。相反,突变体中PSI的增加可能抵消通常巨大的PSI天线的减少。没有观察到类囊体结构的变化,因为不同脂类之间的化学计量似乎是小心平衡的。
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Influence of reduced amounts of sulfoquinovosyl diacylglycerol on the thylakoid membranes of the diatom Thalassiosira pseudonana.

Diatom thylakoids contain much higher amounts of sulfoquinovosyl diacylglycerol (SQDG) than vascular plants and the hypothesis was brought forward that this relates to their special thylakoid structure. To test this hypothesis we created knock-down mutants in Thalassiosira pseudonana that exhibited a decreased SQDG content per cell. Surprisingly, the ratio between the different lipid classes did not change, pointing to strict regulation of thylakoid lipid composition. The antenna proteins, fucoxanthin-chlorophyll proteins (FCP), were reduced and photosystem (PS) I compared to PSII was increased as judged from absorbance spectra. CD spectroscopy indicated a tighter packing of chromophores. The reduction in FCP might help to avoid diametral changes in excitation energy transfer. In contrast, the increase in PSI in the mutants might counteract the diminishment of the usually huge PSI antenna. No changes in thylakoid structure were observed since the stoichiometry between different lipid classes seems to be carefully balanced.

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来源期刊
Photosynthetica
Photosynthetica 生物-植物科学
CiteScore
5.60
自引率
7.40%
发文量
55
审稿时长
3.8 months
期刊介绍: Photosynthetica publishes original scientific papers and brief communications, reviews on specialized topics, book reviews and announcements and reports covering wide range of photosynthesis research or research including photosynthetic parameters of both experimental and theoretical nature and dealing with physiology, biophysics, biochemistry, molecular biology on one side and leaf optics, stress physiology and ecology of photosynthesis on the other side. The language of journal is English (British or American). Papers should not be published or under consideration for publication elsewhere.
期刊最新文献
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