第24卷第3期河北大學學報(自然科學版)Vol.24 No.32004年5月Journal of Hebei University (Natural Science Edition)May 2004甲醇酵母PEG和電轉化法李亞東,王會文,趙曉瑜(河北大學生命科學學院,河北保定07102)摘要:利用電擊法和PEG法分別轉化甲醇酵母，電擊法的轉化率達(DNA)400轉化子/rg,明顯高于PEG法,后者僅為0~20轉化子/pg,而且操作更加快捷.關鍵詞:甲醇酵母;轉化;電穿孔;PEG中圖分類號:Q 812文獻標識碼:A文章編號:1000- 1565(2004)03 - 0299-02甲醇酵母( Pichia pastoris )是集真核生物和原核生物表達系統(tǒng)的優(yōu)點[41-3]于- -身的新- -代表達系統(tǒng):它既具有原核生物的易于培養(yǎng)繁殖快、便于基因工程操作等優(yōu)點,又具有真核生物翻譯后的修飾加工機制,尤其可對表達的蛋白質進行簡單的糖基化修飾.因此對于蚯蚓纖溶酶( Earthworm FibrinoLytie Enzymes, EFE)這-真核生物的糖蛋白而言,酵母表達系統(tǒng)無疑是較理想的表達體系.由于酵母有細胞壁,結構復雜,因此質粒向酵母的轉化不同于大腸桿菌.經(jīng)典的方法是通過制備原生質體進行轉化[41.利用PEG(聚乙二醇)是近年來發(fā)展的- -種較為簡便的方法,該法操作比較簡單,但其轉化率與PEG的相對分子質量大小有很大的關系,而且轉化率較低.采用電擊法,不僅操作更加快捷,而且轉化率也大大提高.1材料與方法1.1 材料甲醇酵母GS115;pPIC9K( Iitrogen公司);LN- 101基因脈沖導入儀(天津理I學院).1.2方法1.2.1構建含有 EFE基因片段的p9K-EK7質粒根據(jù)EFE活性最佳組分的N-末端設計簡并引物,以蚯蚓( Eisenia foetida )cDNA為模板,通過PCR獲得該組分的編碼DNA片段,并克隆到pPIC9K質粒中,構建成p9K - EK7質粒.1.2.2 電擊法將p9K - EK7質粒轉化到甲醇酵母接100 μ甲醇酵母GS115于10 mL YPD中,30 C培養(yǎng)過夜.第2天1%接種量轉接至YPD中,30 C培養(yǎng)至菌液濃度達ODo0= 1.0左右.取1.5 mL菌液,室溫5 kr/min離心1 min,用1 mL無菌冰水洗2次，再用1 mL(1 mol/L)}預冷的山梨醇洗-遍,最后用0.1 mL( 1 mol/L)預冷的山梨醇重新懸浮細胞.將20山(約5ug)經(jīng)線性化的p9K- EK7質粒與80 uL細胞混勻,置于0.2 cm的電轉杯中冰浴5 min. 在7 500 V/cm下,分別以5,10,20 pF電容進行電擊轉化,電擊后迅速加入0.2 ml (1 mol/L)山梨醇,徐MD平板,30 C培養(yǎng)3~5 d.1.2.3 PEG/LiCl 法轉化p9K- EK7質粒于甲醇酵母按1.2.2培養(yǎng)甲醇酵母GS115至菌液濃度達0D00= 1.0左右.取0.5 mL菌液，室溫2 kr/min離心5min棄上清,用0.5mL無菌水重新懸浮菌體,室溫2kr/min離心5min棄上清,用0.25mL(0.1mol/L)收稿日期:2003 -09 -01作者簡介:李亞東(1977- ),男,河北灤平人,河北大學在讀碩:士研究生.第3期蔡建國等:濕式催化氧化技術的研究進展●331peper and pulp industrial waste liquor[J]. Applied Catalysis A:General,2002 ,236:255 - 262.[28] PINTAR A,BESSON M,GALLEZOT P.Catalytic wet air oxidation of kraft bleach plant efluents in a trickle - bed reactor overa Ru/TiO2 catalyst[J]. Applied Catalyssi B: Enironmental,2001 ,31 :275 - 290.[29] DAEWON P,WONSEOK C. Decoloring dye wastewater with low temperature catalytic oxidation[J]. Wat Sci Tech, 199,40(4/5):115- 121.[30] LEI L,HU X,CHU H P,et al. Catalytic wet oxidation of dyeing and printing wastewater[]. Wat Sci Tech, 1997, 35(4):311-319.[31] FAJERWERG K,FOUSSARD J N,PERRARD A,et al. Wet oxidation of phenol by hydrogen peroxide:the key role of pH on .the catalytic behaviour of Fe- ZSM - 5[J]. Wat Sci Tech, 1997 ,35(4):103- 110.[32] TUNG LI HUANG,JORDAN M MACLNNES,KEITH R CLIFFE,et al. Nitrogen removal from wastewater by a catalytic ox-idation method[J]. Wat Res, 2001 ,35(9):2113- 2120.[33] 0XANA P PESTUNOVA,GALINA L ELIZAROVA,ZINFER R ISMAILOV ,et al. Detorication of water cntaining1,1-dimethyIhydrazine by ctalyic oxidation with dioxygen and hydrogen peroxide over Cu- and Fe- ontaing calyts[J]. Catal.ysis Today ,2002,75:219 - 225.Progress of Wet Catalytic Air Oxidation TechnologyCAI Jian-guo,LI Ai-min,ZHANG Quan-xing(State Key Laboratory of Pllution Control and Resource Reuse, School of Environment,Nanjing University , Nanjing 210093,China)Abstract:Wet catalytic air oxidation is a useful kind of advanced oxidation process for high srength, toxic,hazardous and non- biodegradable contaminants under milder conditions, which is developed on the basic of wetair oxidation. The basic concepts,mechanism and kinetis, cssicationn and aplication to wastewater treatmentof wet catalytic air oxidation are reviewed.Key words:wet catalytic air oxidation; wet air oxidation;catalyst; wastewater treatment(責任編輯:梁俊紅)(上接第300頁)Electroporation and PEG Methods of Transformationfor Methlyotrophic YeastLI Ya-dong ,WANG Hui-wen，ZHAO Xiao-yu(Colle of Life Sciences ,Hebei University , Baoding 071002 ,China)Astrat:letricporation and PEG transformation were used to transform methylotrophic yest rspetively .The ransforming rate(DNA) of etroporation method was 400 tasomants/ug, while the PEG methodwas only 0~ 20 transformants /pg.Key words:methylotrophic yeast; transformation; eletroporation; PEG