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題 名 | High Temperature-induced Free Proline Accumulation in Gracilaria Tenuistipitata (Rhodophyta)=高溫誘導龍鬚菜(Gracilaria tenuistipitata)脯氨酸累積 |
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作 者 | 張婉純; 李澤民; | 書刊名 | Botanical Bulletin of Academia Sinica |
卷 期 | 40:4 1999.10[民88.10] |
頁 次 | 頁289-294 |
分類號 | 439.63 |
關鍵詞 | 紅藻; 高溫; 脯氨酸; 蛋白質水解; 龍鬚菜; Gracilaria tenuistipitata; GSAd; High temperature; P5CR; Proline; Protein proteolysis; Red alga; δ-OAT; γ-GK; |
語 文 | 英文(English) |
中文摘要 | 本研究探討高溫 (35℃) 對屬於大型海洋紅藻的龍鬚菜 (Gracilaria tenuistipitata var. liui Zhang et Xia) 自由態脯氨酸累積之影響。在35℃下,自由態捕氯酸在 2 天後隨時間持續累積 , 自由態氮基酸含量不 受影響。可溶性蛋白質含量在 35℃ 下保持不變 ,25℃下則持續增高累積之影響。與 25℃的對照組比較 ,[]-glutamyl kinase ([]-GK-OAT;EC 2.7.2.11 及 glutamate-5-semialdehyde dehydrogenase (GSAd;EC1.4.1.3) 的比活性不受 35℃的影響。 Ornithine []-aminotransferase ([]-OAT;EC2.6.11.3 ) 的比活性在35 ℃℃ 下的2天後隨時間增加而增高,第 5 天後下降。〔〕-Pyrroline-5-carboxylate reductase(P5CR;EC1.5.1.2)的比活性在35 ℃下的 1 天後隨時間增加而增高,第 4 天後下降。[]-OAT 及的 P5CR 比活性的增加趨勢與自由態脯氨酸累積的趨勢相符。35℃所誘導的自由態脯氨酸累積是需光的反應。所以,本結果顯示合成途徑([]-OAT及P5CR) 及蛋白質水解可能參與35℃高溫誘導龍鬚菜自由態捕氯酸的累積。 |
英文摘要 | The effects of high temperature (35°C) on free proline biosynthesis were studied in a marine red macroalga Gracilaria tenuistipitata var. liui Zhang et Xia. Exposure to 35°C decreased the specific growth rate after 3 days and increased the free proline levels after 2 days, but did not affect the free amino acid levels. Soluble protein levels were constant on exposure to 35°C while those of 25°C-treated thalli increased steadily through the treatment periods. The specific activities of both 'glutamyl kinase (γGK; EC 2.7.2.11) and glutamate-5-semialdehyde dehydrogenase (GSAd; EC 1.4.1.3) remained unchanged after exposure to 35°C. Upon exposure to 35°C, the specific activity of ornithine δ-aminotransferase (δ-OAT; EC 2.6.11.3) increased rapidly after 2 days and decreased at Day 5, while that of Δ'-pyrroline-5-carboxylate reductase (P5CR; EC 1.5.1.2) also increased after 1 day and decreased at Day 4. The increase in δ-OAT and P5CR specific activities coincides with the increase in free proline levels. The 35°C induction of free proline accumulation andδ-OAT and P5CR activity increase is a light-dependent process. These results suggest that the stimulation of both synthesis (δ-OAT and P5CR) and protein proteolysis contributes to the 35°Cinduced free proline accumulation in G. tenuistipitata. |
本系統中英文摘要資訊取自各篇刊載內容。