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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.author | 劉棠必 | zh_TW |
| dc.date.accessioned | 2021-07-01T08:19:20Z | - |
| dc.date.available | 2021-07-01T08:19:20Z | - |
| dc.date.issued | 1996 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/76230 | - |
| dc.description.abstract | 本論文採用水生脊椎動物：Tilapia mossambica為實驗材料，對魚類細胞中影響酪胺酸磷酸化的蛋白質酪胺酸解磷酸?與近來受到熱烈討論並成為化學療法對象的拓樸異構?-I進行活性調控的研究。 純化的步驟共使用1次親合力層析法，2次陰離子交換層析法與1次膠體過濾層析法。純化到的核型PTPase其比活性為5.095unit／mg of protein。分子量為62kDa（由膠體過濾管柱SuperoseTM 12層析法推算）與67kDa與60kDa（由SDS-PAGE推算）。pI值為5.79±0.02。pH 7.0為酵素活性最適作用酸鹼值。Ca2+、Mg2+、Mn2+與VO43-與Zn2+五種金屬離子對純化到之核型蛋白質酪胺酸解磷酸?活性的影響皆為抑制效果其中Mn2+，VO43-與Zn2+對PTPase活性具有很強的的抑制作用。 依據等當於蛋白質酪胺酸解磷酸?純化步驟所得到之拓樸異構?-I的比活性為53.000unit／mg of protein。由SDS-PAGE估算之分子量為66kDa，65kDa，64kDa與58kDa，並且可被anti human topoisomerase I-antibody辨認。 純化得到的拓樸異構?-I在事先未經任何處理的狀態下，經由人類鹼性解磷酸?作用後活性幾乎消失，而核型PTPase對於此一狀態的拓樸異構?-I並無影響活性的作用。但若經c-Src以[γ-32P]-ATP封拓樸異構?-I進行磷酸化後，一方面可在放射性自動顯影中觀察到pl由5.32，5.23，5.11與4.93往酸端移動成為4.32，4.23，4.06與3.96，另方面造成拓樸異構?-I的活性下降，之後再經過核PTPase解磷酸化作用後，拓樸異構?-I的解旋能力回復至原來活性。c-Src與核蛋白質酪胺酸解磷酸?對拓樸異構?-I的作用關係與發生的可能性進一步在本論文中討論。 | zh_TW |
| dc.description.abstract | A phosphotyrosyl protein phosphatase (PTPase) was purified from the hepatic nuclear matrix of Tilapia mossambica with a final specific activity of 5.095 units/mg of protein. 2% CHAPS and 2 M NaCl were applied to extract the matrix bound protein and one affinity column (HiTrap Heparine). two anion exchangers (HiTrap Q and Mono Q HR 5/5) plus one gel filtration column (SuperdexTM 200) were conducted consecutuvely to purify the enzyme. The PTPase had a relative molecular mass of 67 kDa and 60 kDa as estimated by SDS-PAGE and of 62 kDa by gel filtration chromatography. This monomeric and neutral PTPase was with an isoelectric point of 5.79 ± 0.02 and an optimal activity at pH 7.0 in the dephosphorylation of a 32P-labeled synthetic insulin receptor peptide [ -RDI(PY)ETD(PY)(PY)R- ] as substrates. Orthovanadate, Zn2+ and Mn2+ were strong inhibitors for the purified PTPase and had IC50 at the level of μM; Mg2+ and Ca2+ had higher IC50 in mM level. Through comparable purification procedures, topoisomerase I was purified in proteolytic forms with relative molecular mass of 66 kDa. 65 kDa and 59 kDa, and had a final specific activity of 53,000 units/mg of protein. The influence of different topoisomerase I phosphorylation states on the enzyme activity was investigated: incubation of the purified topoisomerase I with human alkaline phosphatase abolished the relaxing activity in a time-dependent pattern but not with PTPase. The activity of topoisomerase I was also inhibited (49% decreased) by recombinant human c-Src-mediated tyrosyl phosphorylation and re-activated by PTPase-treatment. In isotope labeling experiments which employed the purified topoisomerase I, [γ-32P] ATP and recombinant human c-Src, a pI-shifting was observed in Immobiline DryStrip Gel by isoelectric focusing. The interaction between Src, topoisomerase I and PTPase was futher discussed. | en |
| dc.description.provenance | Made available in DSpace on 2021-07-01T08:19:20Z (GMT). No. of bitstreams: 0 Previous issue date: 1996 | en |
| dc.description.tableofcontents | 中文摘要 Ⅰ 英文摘要 Ⅱ 縮寫表 Ⅲ 序論 1 材料與方法 10 實驗材料 一．生物材料 10 二．藥品與試劑 10 三．反應組與器材 12 實驗方法 一．酵素純化步驟 13 二．蛋白質磷酸化酪胺酸解磷酸?之活性分析 16 三．拓樸異構?-I之活性分析 17 四．質體DNA的大量製備 18 五．鹼性解磷酸?對拓樸異構?-I活性調控之分析 19 六．酪胺酸磷酸化及解磷酸化反應對拓樸異構?-I活性調控之分析 19 七．膠體過濾層析法估算分子量 20 八．蛋白質定量 21 九．聚丙烯醯胺膠體電泳 21 十．銀染法 22 十一．西方免疫點墨分析 22 十二．等電集焦電泳 23 十三．放射性自動顯影 24 結果 25 討論 31 展望 38 參考文獻 40 圖表 55 | |
| dc.language.iso | zh-TW | |
| dc.title | 吳郭魚肝臟細胞之核型蛋白質磷酸化酪胺酸解磷酸?以c-Src磷酸化的拓樸異構晦-I為受質 | zh_TW |
| dc.title | c-Src Phosphorylated Topoisomerase I as a Substrate of Nuclear Phosphotyrosyl Protein Phosphatase from the Liver of Tilapia mossambica | en |
| dc.date.schoolyear | 84-2 | |
| dc.description.degree | 碩士 | |
| dc.relation.page | 97 | |
| dc.rights.note | 未授權 | |
| dc.contributor.author-dept | 生命科學院 | zh_TW |
| dc.contributor.author-dept | 動物學研究所 | zh_TW |
| 顯示於系所單位： | 動物學研究所 | |
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