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研究生: 蕭偉鎮
Hsiao, Wei-Chen
論文名稱: 結合化學與酵素方法合成多醣體
Chemoenzymatic Synthesis of Oligosaccharides
指導教授: 林俊成
Lin, Chun-Cheng
口試委員: 李耀坤
蒙國光
陳建添
王聖凱
林俊成
學位類別: 博士
Doctor
系所名稱: 理學院 - 化學系
Department of Chemistry
論文出版年: 2014
畢業學年度: 103
語文別: 中文
論文頁數: 154
中文關鍵詞: 醣類抗原化學-酵素合成
外文關鍵詞: Siglecs, chemoenzymatic synthesis
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  • 本研究利用有機合成及酵素催化之合成策略,結合前者之高變化性與後者之高專一性,成功提升合成效率。第一部分為合成腫瘤相關醣體抗原SSEA-5以及DSGb5,利用酵素(GalK、RmlA及LgtC)建構高挑戰性的Gal-1,4-Lac鍵結以合成Gb3三醣體。Gb3進一步與雙醣進行[2+3]醣基化反應,移除保護基後得到乳癌相關抗原SSEA-3。將五醣中間體以有機合成方式於N-乙醯半乳糖胺六號位置連接唾液酸,再利用唾液酸轉移酶於半乳糖三號位置建構另一唾液酸後,便得到腎臟癌抗原DSGb5,本論文為首次完成DSGb5之全合成。
    第二部分為建構唾液酸化多醣體分子庫,以測試醣體唾液酸化之不同位置、數量,期望能提供一分子庫對Siglecs (Sialic acid-binding Ig-like lectins)的結合性。探討於Gal-1,3-GalNAc骨架上三個可供唾液酸化之位置,分別為GalNAc六號、Gal三號及Gal六號位置,依其排列組合共合成七種不同的醣體。透過有機合成與酵素催化之方法完成系列唾液酸化多醣體之合成,後續將以微陣列晶片檢驗醣體結構與Siglecs之結合力。


    Chemoenzymatic synthesis, which combines the structural flexibility of organic synthesis and high specificity and efficacy of enzymatic synthesis, is applied in this research to synthesize oligosaccharides effectively. Herein, tumor-associated carbohydrate antigens SSEA-3, DSGb5, and multisialylated oligosaccharides library were synthesized by chemoenzymatic strategy. The syntheses of tumor-associated antigens were performed by first using enzymes GalK, and RmlA to generate UDP-Gal and LgtC to catalyze the formation of Gal-1,4-Lac linkage to give trisaccharide-Gb3. Following by chemical glycosylation of protected Gb3 with disaccharide and stepwise deprotection, SSEA-3 was acquired in 10 steps from Gb3 with total yield 23%. Then, SSEA-3 underwent chemical sialylation giving monosialylayed hexasaccharide and then enzymatic transformation by gave 2,3- sialyltransferase renal carcinoma antigen DSGb5 to accomplish the first total synthesis of DSGb5.
    In the construction of multisialylated oligosaccharide library, the core structure, Gal-1,3-GalNAc, was sialylated by chemoenzymatic strategy. The library was composed of seven oligosaccharides differed by the number (or position) of sialylated sites. These oligosaccharides will be immobilized on microarray slide and their binding affinities with Siglecs are undergoing.

    摘要 ........................................................................................................... I Abstract..................................................................................................... II 縮寫表&中英對照表 ............................................................................... III 表目錄 ...................................................................................................... X 第一章、腫瘤相關醣體抗原SSEA-3 之合成 ......................................... 1 1-1 癌症相關醣體抗原 .............................................................. 1 1-2 Globo 系列抗原疫苗開發潛力探討 ................................... 5 1-3 Globo H 相關合成分析 ....................................................... 7 1-4 酵素合成建構Gal1,4-Lac 醣苷鍵 ................................. 19 1-5 順式二醇(cis-diol)活化試劑 ............................................. 23 1-6 研究目的與構想 ............................................................... 25 1-7 逆合成分析 ....................................................................... 25 1-8 結果與討論 ........................................................................ 26 1-8-1 合成半乳糖衍生物 .................................................. 26 1-8-2 酵素合成Gb3 衍生物 ............................................. 28 1-8-3 醣受體33 合成 ........................................................ 31 1-8-4 醣予體32 合成 ........................................................ 34 1-8-5 [2+3]醣基化反應 ..................................................... 36 1-9 結論 .................................................................................... 43 第二章、腫瘤相關醣體抗原DSGb5 之合成 ......................................... 44 2-1 腎臟癌相關醣類抗原 ........................................................ 44 2-2 唾液酸 ................................................................................ 45 2-3 唾液酸化學合成方法分析 ................................................ 46 2-3-1 離去基效應 .............................................................. 47 2-3-2 溶劑效應 .................................................................. 50 2-3-3 唾液酸五號位置保護基 .......................................... 52 2-4 唾液酸酵素合成分析 ........................................................ 55 2-4-1 胞苷單磷酸唾液酸合成酶(CMP-Sialic Acid Synthetase) ............................................................... 56 2-4-2 巴德氏桿菌-2,3-唾液酸轉移酶(Pm2,3ST) .......... 57 2-4-3 發光桿菌-2,6-唾液酸轉移酶(Pd2,6ST) ............... 59 2-5 研究目的與構想 ............................................................... 61 2-6 逆合成分析 ....................................................................... 61 VI 2-7 結果與討論 ........................................................................ 62 2-7-1 唾液酸予體之合成 .................................................. 63 2-7-2[5+1]唾液酸化反應 .................................................. 65 2-8 結論 ................................................................................... 70 第三章、唾液酸化醣體分子庫之建構 .................................................. 71 3-1 唾液酸結合性免疫球蛋白樣凝集素 ................................ 71 3-1-1 唾液酸結合性免疫球蛋白樣凝集素-4 ................... 74 3-1-2 唾液酸結合性免疫球蛋白樣凝集素-7 ................... 75 3-1-3 唾液酸結合性免疫球蛋白樣凝集素-14 ................. 76 3-1-4 唾液酸結合性免疫球蛋白樣凝集素-15 ................. 77 3-2 非天然唾液酸化醣體分子庫 ............................................ 78 3-3 研究目的與構想 ............................................................... 83 3-4 結果與討論 ........................................................................ 84 3-4-1 合成路徑分析 .......................................................... 84 3-4-2 化合物68 之合成 ................................................... 85 3-4-3 化合物69 之合成 ................................................... 87 3-4-4 化合物68 衍生之醣體合成 ................................... 87 3-4-5 化合物69 衍生之醣體合成 ................................... 88 3-4-6 核磁共振光譜鑑定各醣體之討論 .......................... 90 3-4-7 醣體結構對於唾液酸轉移酶之反應性比較 .......... 97 3-4-8 改變醣體還原端末端胺基之策略 .......................... 99 3-5 結論 .................................................................................. 100 第四章、未來展望 ................................................................................ 101 第五章、實驗部分 ................................................................................ 102 4-1 Meterial and methods ....................................................... 102 4-2 Synthetic procedures and characterization....................... 104 第六章、參考文獻 ................................................................................ 146 VII 圖目錄 圖一、mucin type 腫瘤相關抗原 ........................................................... 2 圖二、醣苷神經胺基脂類(glycosphingolipid) ....................................... 2 圖三、Ganglio-系列醣體結構示意圖..................................................... 3 圖四、Globo 系列醣體結構示意圖 ........................................................ 3 圖五、Lacto-系列醣體結構示意圖 ........................................................ 4 圖六、SSEA-3、SSEA-4 與Globo H 結構圖 ........................................ 6 圖四、Globo 系列醣體結構示意圖 ........................................................ 8 圖七、反應性梯度一鍋化合成策略。 ................................................. 13 圖八、酵素合成UDP-Gal 路徑圖 ........................................................ 20 圖九、GalK 受質轉換效率比較 ........................................................... 21 圖十、RmlA 對各受質長時間與短時間轉換效率比較 ...................... 22 圖十一、P1 antigen 結構圖 .................................................................. 22 圖十二、硼酸衍生物催化順式二醇選擇性進行多種反應 ................. 24 圖十三、化合物38 氫核磁共振光譜 ................................................... 30 圖十四、化合物38 之COSY 光譜 ...................................................... 31 圖十五、(a)4,6-及(b)3,4-丙酮縮醛氫核磁共振光譜之比較 ............... 32 圖十六、化合物50 COSY 二維光譜圖 ............................................... 35 圖十七、化合物50 COSY 光譜圖 ....................................................... 36 VIII 圖十八、化合物51 之HPLC 分析圖................................................... 37 圖十九、化合物52 之HPLC 分析圖................................................... 38 圖二十、化合物52 於不同氘溶劑中氫核磁共振光譜之比較 ........... 39 圖二十一、化合物32、33 與52 碳核磁共振光譜之比較 ................. 40 圖二十二、化合物52 HMQC 光譜圖 .................................................. 41 圖二十三、化合物53 HMQC 光譜圖 .................................................. 41 圖二十四、Troc 去保護反應機構 ........................................................ 42 圖二十五、腎臟癌相關醣體抗原結構圖 ............................................. 44 圖二十六、自然界主要三種唾液酸 ..................................................... 46 圖二十七、溶劑效應 ............................................................................ 51 圖二十八、化合物66 氫耦合碳譜 ....................................................... 67 圖二十九、碳核磁共振光譜分析Troc 與乙醯基之轉換 .................... 68 圖三十、Siglec 結構示意圖 .................................................................. 72 圖三十一、MAG 抑制軸突細胞再生機制圖 ....................................... 75 圖三十二、成對受器Siglec-5 與Siglec-14 ......................................... 77 圖三十三、Siglec-15 與sTn 結合後誘發表現TGF-之示意圖 ......... 78 圖三十四、O-linked 及N-linked 相關唾液酸化醣體衍生物 .............. 80 圖三十五、化合物73 氫耦合碳核磁共振光譜 ................................... 86 圖三十六、醣體六號位置唾液酸化氫核磁共振光譜(一) ................... 90 IX 圖三十七、醣體六號位置唾液酸化氫核磁共振光譜(二) ................... 91 圖三十八、醣體六號位置唾液酸化碳核磁共振光譜(一) ................... 93 圖三十九、醣體六號位置唾液酸化碳核磁共振光譜(二) ................... 94 圖四十、多醣體變旋異構碳比較圖 ..................................................... 96 圖四十一、多重唾液酸化醣體分子庫 ............................................... 100

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    . 陳仲宇,國立清華大學化學研究所,碩士論文,腫瘤相關抗原Globo-H 與SSEA-3之合成研究,民國98年

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