108 年 國立臺灣大學植物科學系碩士班《專業英文（K）》
第 1 題25 分
- 25%
Fatty acids are synthesized in the stroma of plant and algal chloroplasts by the fatty acid synthase complex. Newly synthesized fatty acids are then used to generate plastidial lipids that are essential for chloroplast structure and function. Here, we show that inhibition of fatty acid synthesis in the model alga Chlamydomonas reinhardtii activates autophagy, a highly conserved catabolic process by which cells degrade intracellular material under adverse conditions to maintain cell homeostasis. Treatment of Chlamydomonas cells with cerulenin, a specific fatty acid synthase inhibitor, stimulated lipidation of the autophagosome protein ATG8 and enhanced autophagic flux. We found that inhibition of fatty acid synthesis decreased monogalactosyldiacylglycerol abundance, increased lutein content, down-regulated photosynthesis, and increased the production of reactive oxygen species. Electron microscopy revealed a high degree of thylakoid membrane stacking in cerulenin-treated cells. Moreover, global transcriptomic analysis of these cells showed an up-regulation of genes encoding chloroplast proteins involved in protein folding and oxidative stress and the induction of major catabolic processes, including autophagy and proteasome pathways. Thus, our results uncovered a link between lipid metabolism, chloroplast integrity, and autophagy through a mechanism that involves the activation of a chloroplast quality control system.
(Plant Physiology (2018) 178, 1112-1129)
- Give this study an English title? (English)
- Beyond proper nouns, describe the following in Chinese:
a) What problem does this abstract describe this research addressing?
b) What research methods were used in this study, and what conclusions did these studies reach?
c) What is the main conclusion of this research?
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這一題的完整詳解
這題考驗考生閱讀英文摘要並進行歸納、總結與翻譯的能力。
核心觀念：
- 理解摘要內容：精確掌握研究背景、實驗方法、結果與結論。
- 英文標題撰寫：根據研究核心內容，提煉出簡潔具代表性的英文標題。
- 中文敘述與總結：將專業術語（專有名詞）排除後，用白話中文闡述研究問題、方法、結論。
解題步驟：
1) 英文標題撰寫 (Give this study an English title?)
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分析摘要核心：此研究探討在藻類 Chlamydomonas reinhardtii 中，抑制脂肪酸合成（fatty acid synthesis inhibition）如何影響細胞。主要發現是抑制脂肪酸合成會活化自噬作用（autophagy），並與葉綠體完整性（chloroplast integrity）及細胞品質控制系統（chloroplast quality control system）有關。
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關鍵字提煉：Fatty acid synthesis inhibition, Chlamydomonas reinhardtii, autophagy, chloroplast, quality control.
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構思標題：可以從因果關係或核心發現來構思。
- 因果關係：Inhibition of Fatty Acid Synthesis Activates Autophagy in Chlamydomonas Chloroplasts.
- 核心發現：Linking Lipid Metabolism, Chloroplast Integrity, and Autophagy via a Chloroplast Quality Control System.
- 更簡潔：Fatty Acid Synthesis Inhibition Induces Autophagy in Algal Chloroplasts.
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建議標題：Fatty Acid Synthesis Inhibition Activates Autophagy and Links to Chloroplast Quality Control in Chlamydomonas. (此標題涵蓋了主要變因、主要反應、機制與模式生物)
2) 中文敘述 (Beyond proper nouns, describe the following in Chinese)
- a) 這篇摘要敘述此研究在研究什麼樣的問題?
- 摘要開頭點出脂肪酸合成是葉綠體的重要功能。接著說明，研究者想了解當藻類 (Chlamydomonas reinhardtii) 的脂肪酸合成被抑制時，會發生什麼事。