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一種熱穩(wěn)定性提高的脂肪氧合酶突變體及其構(gòu)建方法與流程

文檔序號(hào):12411571閱讀:212來(lái)源:國(guó)知局
一種熱穩(wěn)定性提高的脂肪氧合酶突變體及其構(gòu)建方法與流程
本發(fā)明涉及生物技術(shù),具體涉及一種熱穩(wěn)定性提高的脂肪氧合酶突變體及其構(gòu)建方法。
背景技術(shù)
:LOX(Lipoxygenase,LOX)是非血紅素、非硫鐵過(guò)氧化酶,它能催化具有順,順-1,4-戊二烯結(jié)構(gòu)的多元不飽和脂肪酸及其酯類發(fā)生空間及位置特異性的雙加氧反應(yīng),生成相應(yīng)的氫過(guò)氧化物。在植物中其天然底物主要是亞油酸和亞麻酸,在動(dòng)物體內(nèi)其天然底物主要是花生四烯酸。LOX作為無(wú)毒、無(wú)害、天然的添加劑在食品、醫(yī)藥、化工等領(lǐng)域有著重要的應(yīng)用價(jià)值。在面粉的加工過(guò)程中它能夠?qū)⒚娣壑械亩嗖伙柡椭舅岽呋趸蓺溥^(guò)氧化物,這些氫過(guò)氧化物能夠起到提高面粉白度,增強(qiáng)面筋蛋白強(qiáng)度的作用。另外,在污水處理與環(huán)境保護(hù)方面,可以用于染料的降解。然而脂肪氧合酶熱穩(wěn)定性差的缺陷限制了其在工業(yè)上的應(yīng)用。因此,通過(guò)分子改造來(lái)提高脂肪氧合酶熱穩(wěn)定性以期獲得酶學(xué)性質(zhì)更適用工業(yè)應(yīng)用的突變酶是目前的研究熱點(diǎn)。技術(shù)實(shí)現(xiàn)要素:本發(fā)明目的是為了提供一種酶活與熱穩(wěn)定性同時(shí)提高的脂肪氧合酶突變體及其構(gòu)建方法,提高了脂肪氧合酶突變體的熱穩(wěn)定性,擴(kuò)展了應(yīng)用范圍。本發(fā)明的技術(shù)方案如下:一種熱穩(wěn)定性提高的脂肪氧合酶突變體,該脂肪氧合酶突變體具有如SEQIDNO.2、SEQIDNO.3、SEQIDNO.4、SEQIDNO.5或SEQIDNO.6中任一種所示的氨基酸序列。一種以上所述的熱穩(wěn)定性提高的脂肪氧合酶突變體中PCR反應(yīng)的簡(jiǎn)并引物,其特征在于,該簡(jiǎn)并引物具體如下:N130-f:TTACTCACNNKCTGGCAAAATATGACATCAAG;N130-r:TTTGCCAGMNNGTGAGTAAGCTCATGTG;S437-f:GGAAAAATCANNKATATTGGAACCAGGACTTC;S437-r:TCCAATATMNNTGATTTTTCCCGAATGAGCG;G260-f:GCTAACGCAGNNKTCTATTGTTGATGTAA;G260-r:AACAATAGAMNNCTGCGTTAGCATG。一種以上所述的熱穩(wěn)定性提高的脂肪氧合酶突變體的構(gòu)建方法,包括以下步驟:(1)魚腥藻脂肪氧合酶突變位點(diǎn)確定:將魚腥藻脂肪氧合酶自N端起第130位天冬酰胺、260位甘氨酸和437位絲氨酸作為飽和突變位點(diǎn);(2)魚腥藻脂肪氧合酶突變體庫(kù)的建立及突變體篩選:以重組質(zhì)粒為模板,在第130位天冬酰胺、260位甘氨酸和437位絲氨酸相對(duì)應(yīng)的核苷酸處利用NNK代替原有密碼子設(shè)計(jì)簡(jiǎn)并引物,該簡(jiǎn)并引物如以上所述,進(jìn)行全質(zhì)粒PCR反應(yīng),構(gòu)建3個(gè)定點(diǎn)飽和突變庫(kù),DpnI消化模板,純化后產(chǎn)物直接轉(zhuǎn)化大腸桿菌,將轉(zhuǎn)化后的大腸桿菌涂布于含有100μg/ml氨芐抗性LB平板上,37℃下培養(yǎng)16-24小時(shí),得到3個(gè)飽和突變庫(kù);(3)取3個(gè)飽和突變庫(kù)的菌落接種于含有氨芐LB培養(yǎng)基的96孔板中,于37℃過(guò)夜培養(yǎng),得到3個(gè)突變體庫(kù)的母版,取母版接種于含有氨芐LB培養(yǎng)基的96孔板中,37℃下培養(yǎng)3h,再加入IPTG低溫誘導(dǎo)16h;然后裂解菌體,得到粗酶液,將粗酶液在50℃條件下孵育5min,冷卻,測(cè)定殘余活力,得到陽(yáng)性突變體;;(4)將步驟(3)得到的陽(yáng)性突變體接種于含有氨芐青霉素的LB液體培養(yǎng)基中,37℃,180rpm培養(yǎng)至OD600為0.6-0.8時(shí),加IPTG低溫誘導(dǎo),離心收集菌體,用磷酸鹽緩沖液重懸菌體,超聲波破碎菌體,將上清液過(guò)Ni-NTA親和柱純化,透析去除咪唑即得到純的脂肪氧合酶突變體。進(jìn)一步地,所述的熱穩(wěn)定性提高的脂肪氧合酶突變體的構(gòu)建方法,步驟(2)中大腸桿菌為大腸桿菌E.coliBL21(DE3)。進(jìn)一步地,所述的熱穩(wěn)定性提高的脂肪氧合酶突變體的構(gòu)建方法,其特征在于,步驟(2)中重組質(zhì)粒為重組質(zhì)粒pET32a-Ana-LOX。進(jìn)一步地,所述的熱穩(wěn)定性提高的脂肪氧合酶突變體的構(gòu)建方法,步驟(2)中全質(zhì)粒PCR反應(yīng)的反應(yīng)條件為:96℃5min;然后98℃10s,55℃5s,72℃90s,共25個(gè)循環(huán);最后72℃5min。進(jìn)一步地,所述的熱穩(wěn)定性提高的脂肪氧合酶突變體的構(gòu)建方法,步驟(3)中裂解菌體采用凍融破碎的方法進(jìn)行,具體為-70℃冷凍2小時(shí),室溫融化1小時(shí),反復(fù)凍融。以上所述的熱穩(wěn)定性提高的脂肪氧合酶突變體在食品、制藥、造紙或污水處理中的應(yīng)用。與野生型魚腥藻脂肪氧合酶相比,本發(fā)明的脂肪氧合酶突變體的熱穩(wěn)定性獲得了提高,以各自的比活力及半衰期t1/2來(lái)表示酶活與熱穩(wěn)定性的提高,本發(fā)明的脂肪氧合酶突變體熱穩(wěn)定性提高如表1所示。表1本發(fā)明首先利用已知的結(jié)構(gòu)與生物信息學(xué)信息,找出可能的突變位點(diǎn),在對(duì)這些位點(diǎn)進(jìn)行飽和突變,構(gòu)建突變文庫(kù);然后在96孔板上進(jìn)行誘導(dǎo)表達(dá);最后對(duì)文庫(kù)進(jìn)行篩選得到性質(zhì)改良的突變體。再以此突變株作為模板,組合其余位點(diǎn)的突變,重復(fù)上述過(guò)程。本發(fā)明運(yùn)用半理性設(shè)計(jì)的方法,對(duì)魚腥藻脂肪氧合酶基因進(jìn)行多輪定點(diǎn)飽和突變,獲取脂肪氧合酶突變體,這些突變體包含氨基酸突變G260A、S437T、N130D及組合突變體N130D/S437Y、N130D/G260Q。以各自的比活力與半衰期t1/2來(lái)表示,脂肪氧合酶突變體的活力與熱穩(wěn)定性得到了提高,具有較高的實(shí)際應(yīng)用價(jià)值和廣闊的市場(chǎng)前景。附圖說(shuō)明圖1為本發(fā)明實(shí)施例1中脂肪氧合酶家族蛋白的系統(tǒng)發(fā)育樹圖;圖2為本發(fā)明實(shí)施例1中多重序列比對(duì)選擇突變位點(diǎn)圖;圖3為本發(fā)明實(shí)施例1中脂肪氧合酶突變體熱失活動(dòng)力學(xué)圖;圖4為本發(fā)明實(shí)施例1中脂肪氧合酶突變體最適反應(yīng)溫度圖。具體實(shí)施方式實(shí)施例11.飽和突變位點(diǎn)的確定:對(duì)脂肪氧合酶家族進(jìn)行系統(tǒng)發(fā)育分析,選擇與魚腥藻脂肪氧合酶進(jìn)化關(guān)系緊密的同一家族的氨基酸序列進(jìn)行多重序列比對(duì),結(jié)合結(jié)構(gòu)信息確定下列位點(diǎn)為飽和突變位點(diǎn):自N端起第130位天冬酰胺、260位甘氨酸、437位絲氨酸。其中魚腥藻脂肪氧合酶氨基酸序列如SEQIDNO.1所示。突變位點(diǎn)選擇過(guò)程具體為在pfam數(shù)據(jù)庫(kù)中選擇脂肪氧合酶家族序列,將其通道blastp與Ana-LOX進(jìn)行比對(duì),篩選出相似度30%-90%的序列,并構(gòu)建系統(tǒng)發(fā)育樹,最終選擇與Ana-LOX親緣關(guān)系最近的序列(圖1)。將這些序列進(jìn)行多重序列比對(duì),比對(duì)結(jié)果與Ana-LOX進(jìn)行比較,篩選出潛在的突變位點(diǎn)(圖2)。Ana-LOX序列提交phyre2網(wǎng)站構(gòu)建三維模型,將潛在的突變位點(diǎn)放在模型中結(jié)合作用力分析,最終確定自N端起第130位天冬酰胺、260位甘氨酸、437位絲氨酸為突變位點(diǎn)。其中圖1為脂肪氧合酶家族蛋白的系統(tǒng)發(fā)育樹圖,通過(guò)構(gòu)建Ana-LOX與其蛋白質(zhì)家族的系統(tǒng)發(fā)育樹篩選出8條序列與其進(jìn)化關(guān)系緊密,選擇這些序列進(jìn)行多重序列比對(duì)。圖2為多重序列比對(duì)選擇突變位點(diǎn)圖,可以發(fā)現(xiàn)Ana-LOX氨基酸序列與其多重序列比對(duì)存在大量的位點(diǎn)不一致,例如130號(hào)位Ana-LOX為天冬酰胺而該處頻率最高的氨基酸為天冬氨酸,可以將其視為潛在的突變位點(diǎn),可以做為進(jìn)一步分析的候選。2.魚腥藻脂肪氧合酶突變體庫(kù)的建立及突變體篩選用下述方法篩選具有較好熱穩(wěn)定性的魚腥藻脂肪氧合酶的突變體,具體過(guò)程包括以下步驟:1)根據(jù)突變位點(diǎn)構(gòu)建飽和突變庫(kù)并導(dǎo)入宿主細(xì)胞以重組質(zhì)粒pET32a-Ana-LOX為模板,根據(jù)以上確定的突變位點(diǎn),分別在第130位天冬酰胺、260位甘氨酸、437位絲氨酸相對(duì)應(yīng)的核苷酸處利用NNK代替原有密碼子,設(shè)計(jì)簡(jiǎn)并引物:N130-fTTACTCACNNKCTGGCAAAATATGACATCAAG(SEQIDNO.7)N130-rTTTGCCAGMNNGTGAGTAAGCTCATGTG(SEQIDNO.8)S437-fGGAAAAATCANNKATATTGGAACCAGGACTTC(SEQIDNO.9)S437-rTCCAATATMNNTGATTTTTCCCGAATGAGCG(SEQIDNO.10)G260-fGCTAACGCAGNNKTCTATTGTTGATGTAA(SEQIDNO.11)G260-rAACAATAGAMNNCTGCGTTAGCATG(SEQIDNO.12)以上簡(jiǎn)并引物中,N代表ATCG中的任一種;M代表A和C中的任一種;K代表G和T中的任一種。然后進(jìn)行全質(zhì)粒PCR反應(yīng),使用TaKaRa公司的PrimeSTARDNA聚合酶,PCR反應(yīng)條件為:96℃5min;然后98℃10s,55℃5s,72℃90s,共25個(gè)循環(huán);最后72℃5min。構(gòu)建3個(gè)定點(diǎn)飽和突變庫(kù),DpnI消化模板,純化后產(chǎn)物直接轉(zhuǎn)化大腸桿菌E.coliBL21(DE3),將轉(zhuǎn)化后的大腸桿菌涂布于含有100μg/ml氨芐抗性LB平板上,37℃下培養(yǎng)16-24小時(shí),得到3個(gè)飽和突變庫(kù);2)從飽和突變體庫(kù)中篩選熱穩(wěn)定性提高的突變體取飽和突變庫(kù)中的菌落接種于含有100μg/ml氨芐LB培養(yǎng)基的96孔板中,于37℃過(guò)夜培養(yǎng),得到3個(gè)突變體庫(kù)的母版;從培養(yǎng)好的母版中取20μl接種至含有100μg/ml氨芐LB培養(yǎng)基的96孔板中,37℃下培養(yǎng)3h,在加入終濃度為100μg/ml的IPTG,16℃誘導(dǎo)16h;利用凍融破碎的方法裂解菌體,得到粗酶液;將所得到的粗酶液在50℃下孵育5min,在冰上冷卻,測(cè)定每孔的殘余活力;以野生型為對(duì)照,將殘余活力高于野生型的作為陽(yáng)性突變體。將篩選到的陽(yáng)性突變體工程菌接種于含有100μg/mL氨芐青霉素的LB液體培養(yǎng)基中,37℃,180rpm培養(yǎng)至OD600為0.6-0.8時(shí),加IPTG至100μg/mL,低溫16℃誘導(dǎo)16h,離心收集菌體,用磷酸鹽緩沖液重懸菌體,超聲波破碎菌體,并將上清液過(guò)Ni-NTA親和柱純化,透析去除咪唑即可得到純的脂肪氧合酶突變體;純酶液測(cè)定50℃下的半衰期,確定每個(gè)突變體庫(kù)中熱穩(wěn)定性最高的突變體,進(jìn)行測(cè)序,至此完成了第一輪篩選,得到三個(gè)熱穩(wěn)定性與酶活提高的突變體,分別為N130D,G260A和S437T,分別對(duì)應(yīng)SEQIDNO.2,3和4。以N130D的基因作為模板,進(jìn)行突變體組合:針對(duì)260位甘氨酸、437位絲氨酸位點(diǎn)設(shè)計(jì)飽和突變庫(kù),并參考上述步驟進(jìn)行新一輪的篩選;經(jīng)過(guò)組合突變,獲得了兩株熱穩(wěn)定性與酶活力顯著提高的突變株,經(jīng)測(cè)序確定兩株組合突變體分別為:N130D/G260Q,N130D/S437Y,分別對(duì)應(yīng)SEQIDNO.5和6。為了測(cè)定脂肪氧合酶突變體的比活力與半衰期,對(duì)酶進(jìn)行分離純化。將超聲破碎得到的粗酶液通過(guò)Ni2+離子親和柱進(jìn)行純化,透析過(guò)夜即可得到純的脂肪氧合酶突變體純酶。脂肪氧合酶在50℃下半衰期的測(cè)定方法為:50℃下孵育酶液,在不同處理時(shí)間取樣,測(cè)定殘余活力百分比。以殘余活力百分比的ln值對(duì)時(shí)間t(min)作圖,直線的斜率為失活常數(shù)kd,由t1/2=ln2/kd得到脂肪氧合酶在該溫度下的半衰期。圖3為脂肪氧合酶突變體熱失活動(dòng)力學(xué)圖在單點(diǎn)突變中N130D突變對(duì)酶熱穩(wěn)定性的改良最為顯著。在N130D的基礎(chǔ)上,組合突變體N130D/S437Y、N130D/G260Q的熱穩(wěn)定性也有了進(jìn)一步提升。圖4為脂肪氧合酶突變體最適反應(yīng)溫度圖,突變體對(duì)溫度的適應(yīng)范圍相比野生型變得更寬,在常溫下25℃野生型活力低于50%,而突變體均超過(guò)60%,可以推測(cè)突變體活化能降低。野生型對(duì)穩(wěn)定較為敏感,當(dāng)溫度超過(guò)最適反應(yīng)溫度35℃,酶活急劇下降,而突變體S437T與N130D/S437Y的最適反應(yīng)溫度可以達(dá)到45℃。組合突變體N130D/S437Y、N130D/G260Q即使達(dá)到55℃的高溫依然可以保持70%以上的活力,而此時(shí)野生型已經(jīng)失活。具有Ser437位置的突變體S437T與N130D/S437Y最適反應(yīng)溫度均提高了10℃,表明Ser437位置時(shí)影響最適反應(yīng)溫度的關(guān)鍵氨基酸。脂肪氧合酶目前在多個(gè)領(lǐng)域都有著廣泛的應(yīng)用,如在食品領(lǐng)域可使面粉增白,在造紙、染料、涂料、洗滌劑、污水處理、聚氯乙烯增塑劑的工業(yè)化生產(chǎn),還可作為藥物合成的中間體,所以脂肪氧合酶也被用于其他工業(yè)催化用途,如利用脂肪氧合酶對(duì)脂肪酸或脂肪酸酯進(jìn)行選擇性催化,形成特定的氫過(guò)氧化脂肪酸及其酯的衍生物,再將之環(huán)氧化,生成環(huán)氧化油,則可減小石油用量;氫過(guò)氧化油脂經(jīng)還原得到羥基油脂,經(jīng)過(guò)氧化物酶裂解得到不飽和酸及醛,再進(jìn)一步反應(yīng)可以得到二元酸,這些物質(zhì)在食品、化工、生物技術(shù)等領(lǐng)域都有重要用途。因此,本發(fā)明提供的脂肪氧合酶突變體能夠在以上領(lǐng)域進(jìn)行更好的應(yīng)用。序列表<110>南京農(nóng)業(yè)大學(xué)<120>一種熱穩(wěn)定性提高的脂肪氧合酶突變體及其構(gòu)建方法<130>1<160>12<170>PatentInversion3.3<210>1<211>455<212>PRT<213>魚腥藻脂肪氧合酶野生型氨基酸序列<400>1GlyValSerGlyAlaLeuValHisTyrPheGlySerIleValArgAla151015GluArgThrGlnTyrLeuTyrGlySerLysAspAspLeuProGlyLys202530ProValTyrPheProLeuProValThrGluIleProSerLysArgPhe354045LeuPheLeuLeuGluLysTyrAsnPheLeuThrAspAsnSerTyrPro505560SerAspGlyGluHisAspLysIleGluAlaLeuValSerAlaMetPro65707580ThrThrAlaLeuAspLeuAlaValGlyThrThrAspProThrAspIle859095ProAspSerTyrPheLeuGluArgArgLeuAsnGlyTyrAsnProGly100105110AlaIleArgGluSerSerGlyGlnGluGlyTrpThrHisGluLeuThr115120125HisAsnLeuAlaLysTyrAspIleLysProGlyLeuHisPheProAsp130135140PheValGlnCysArgLeuPheValAspLysGlnAsnGlyValLysLeu145150155160HisSerIleLysIleAspAspHisGluIleThrProCysGlnGluGln165170175TrpGlnTyrAlaLysArgThrTyrLeuGlnAlaGluPheLeuSerGln180185190GluLeuLysLeuHisLeuAlaArgCysHisPheAsnIleGluGlnTyr195200205ValMetAlaIleLysArgArgLeuAlaProThrHisProValArgAla210215220PheIleAsnProHisLeuGluGlyLeuIlePheIleAsnSerSerAla225230235240ValProLysIleIleGlySerThrGlyPheIleProIleAlaSerMet245250255LeuThrGlnGlySerIleValAspValMetLysAsnGluLeuSerLys260265270LeuSerTyrMetTrpAsnProIleAlaAspLeuProArgAspIlePro275280285GlyAspLeuPheThrProAlaAlaThrAlaTyrTrpGluLeuLeuAsn290295300AsnTyrValGluGlnGlyLeuLeuGlnProPheGluAspGluLeuArg305310315320ThrGluValAsnAlaIleGlnValAspGluLeuPheAlaGluLeuLys325330335GluArgSerLeuTyrSerGlyAspGlnProProLysTyrAspSerSer340345350GluLeuLysSerLeuLeuMetTyrIleIleTyrHisSerSerPheLeu355360365HisSerTrpAlaAsnPheLysGlnTyrAspAspAlaGlyAsnProAsn370375380HisValSerMetGlyAspTyrSerGlnTyrAspGlnGlnThrGlnAsp385390395400LysIleArgPheSerGlnArgSerLeuThrTrpValLeuSerSerIle405410415ArgTyrAsnSerValAlaValTyrGlySerAspLeuLeuLysGlnLeu420425430IleArgGluLysSerSerIleLeuGluProGlyLeuProLeuGluAsp435440445LeuMetMetSerIleAsnIle450455<210>2<211>455<212>PRT<213>魚腥藻脂肪氧合酶N130D突變體氨基酸序列<400>2GlyValSerGlyAlaLeuValHisTyrPheGlySerIleValArgAla151015GluArgThrGlnTyrLeuTyrGlySerLysAspAspLeuProGlyLys202530ProValTyrPheProLeuProValThrGluIleProSerLysArgPhe354045LeuPheLeuLeuGluLysTyrAsnPheLeuThrAspAsnSerTyrPro505560SerAspGlyGluHisAspLysIleGluAlaLeuValSerAlaMetPro65707580ThrThrAlaLeuAspLeuAlaValGlyThrThrAspProThrAspIle859095ProAspSerTyrPheLeuGluArgArgLeuAsnGlyTyrAsnProGly100105110AlaIleArgGluSerSerGlyGlnGluGlyTrpThrHisGluLeuThr115120125HisAspLeuAlaLysTyrAspIleLysProGlyLeuHisPheProAsp130135140PheValGlnCysArgLeuPheValAspLysGlnAsnGlyValLysLeu145150155160HisSerIleLysIleAspAspHisGluIleThrProCysGlnGluGln165170175TrpGlnTyrAlaLysArgThrTyrLeuGlnAlaGluPheLeuSerGln180185190GluLeuLysLeuHisLeuAlaArgCysHisPheAsnIleGluGlnTyr195200205ValMetAlaIleLysArgArgLeuAlaProThrHisProValArgAla210215220PheIleAsnProHisLeuGluGlyLeuIlePheIleAsnSerSerAla225230235240ValProLysIleIleGlySerThrGlyPheIleProIleAlaSerMet245250255LeuThrGlnGlySerIleValAspValMetLysAsnGluLeuSerLys260265270 LeuSerTyrMetTrpAsnProIleAlaAspLeuProArgAspIlePro275280285GlyAspLeuPheThrProAlaAlaThrAlaTyrTrpGluLeuLeuAsn290295300AsnTyrValGluGlnGlyLeuLeuGlnProPheGluAspGluLeuArg305310315320ThrGluValAsnAlaIleGlnValAspGluLeuPheAlaGluLeuLys325330335GluArgSerLeuTyrSerGlyAspGlnProProLysTyrAspSerSer340345350GluLeuLysSerLeuLeuMetTyrIleIleTyrHisSerSerPheLeu355360365HisSerTrpAlaAsnPheLysGlnTyrAspAspAlaGlyAsnProAsn370375380HisValSerMetGlyAspTyrSerGlnTyrAspGlnGlnThrGlnAsp385390395400LysIleArgPheSerGlnArgSerLeuThrTrpValLeuSerSerIle405410415ArgTyrAsnSerValAlaValTyrGlySerAspLeuLeuLysGlnLeu420425430IleArgGluLysSerSerIleLeuGluProGlyLeuProLeuGluAsp435440445LeuMetMetSerIleAsnIle450455<210>3<211>455<212>PRT<213>魚腥藻脂肪氧合酶G260A突變體氨基酸序列<400>3GlyValSerGlyAlaLeuValHisTyrPheGlySerIleValArgAla151015GluArgThrGlnTyrLeuTyrGlySerLysAspAspLeuProGlyLys202530ProValTyrPheProLeuProValThrGluIleProSerLysArgPhe354045LeuPheLeuLeuGluLysTyrAsnPheLeuThrAspAsnSerTyrPro505560SerAspGlyGluHisAspLysIleGluAlaLeuValSerAlaMetPro65707580ThrThrAlaLeuAspLeuAlaValGlyThrThrAspProThrAspIle859095ProAspSerTyrPheLeuGluArgArgLeuAsnGlyTyrAsnProGly100105110AlaIleArgGluSerSerGlyGlnGluGlyTrpThrHisGluLeuThr115120125HisAsnLeuAlaLysTyrAspIleLysProGlyLeuHisPheProAsp130135140PheValGlnCysArgLeuPheValAspLysGlnAsnGlyValLysLeu145150155160HisSerIleLysIleAspAspHisGluIleThrProCysGlnGluGln165170175TrpGlnTyrAlaLysArgThrTyrLeuGlnAlaGluPheLeuSerGln180185190GluLeuLysLeuHisLeuAlaArgCysHisPheAsnIleGluGlnTyr195200205ValMetAlaIleLysArgArgLeuAlaProThrHisProValArgAla210215220PheIleAsnProHisLeuGluGlyLeuIlePheIleAsnSerSerAla225230235240ValProLysIleIleGlySerThrGlyPheIleProIleAlaSerMet245250255LeuThrGlnAlaSerIleValAspValMetLysAsnGluLeuSerLys260265270LeuSerTyrMetTrpAsnProIleAlaAspLeuProArgAspIlePro275280285GlyAspLeuPheThrProAlaAlaThrAlaTyrTrpGluLeuLeuAsn290295300AsnTyrValGluGlnGlyLeuLeuGlnProPheGluAspGluLeuArg305310315320ThrGluValAsnAlaIleGlnValAspGluLeuPheAlaGluLeuLys325330335GluArgSerLeuTyrSerGlyAspGlnProProLysTyrAspSerSer340345350GluLeuLysSerLeuLeuMetTyrIleIleTyrHisSerSerPheLeu355360365HisSerTrpAlaAsnPheLysGlnTyrAspAspAlaGlyAsnProAsn370375380HisValSerMetGlyAspTyrSerGlnTyrAspGlnGlnThrGlnAsp385390395400LysIleArgPheSerGlnArgSerLeuThrTrpValLeuSerSerIle405410415ArgTyrAsnSerValAlaValTyrGlySerAspLeuLeuLysGlnLeu420425430IleArgGluLysSerSerIleLeuGluProGlyLeuProLeuGluAsp435440445LeuMetMetSerIleAsnIle450455<210>4<211>455<212>PRT<213>魚腥藻脂肪氧合酶S437T突變體氨基酸序列<400>4GlyValSerGlyAlaLeuValHisTyrPheGlySerIleValArgAla151015GluArgThrGlnTyrLeuTyrGlySerLysAspAspLeuProGlyLys202530ProValTyrPheProLeuProValThrGluIleProSerLysArgPhe354045LeuPheLeuLeuGluLysTyrAsnPheLeuThrAspAsnSerTyrPro505560SerAspGlyGluHisAspLysIleGluAlaLeuValSerAlaMetPro65707580ThrThrAlaLeuAspLeuAlaValGlyThrThrAspProThrAspIle859095ProAspSerTyrPheLeuGluArgArgLeuAsnGlyTyrAsnProGly100105110AlaIleArgGluSerSerGlyGlnGluGlyTrpThrHisGluLeuThr115120125HisAsnLeuAlaLysTyrAspIleLysProGlyLeuHisPheProAsp130135140PheValGlnCysArgLeuPheValAspLysGlnAsnGlyValLysLeu145150155160HisSerIleLysIleAspAspHisGluIleThrProCysGlnGluGln165170175TrpGlnTyrAlaLysArgThrTyrLeuGlnAlaGluPheLeuSerGln180185190GluLeuLysLeuHisLeuAlaArgCysHisPheAsnIleGluGlnTyr195200205ValMetAlaIleLysArgArgLeuAlaProThrHisProValArgAla210215220PheIleAsnProHisLeuGluGlyLeuIlePheIleAsnSerSerAla225230235240ValProLysIleIleGlySerThrGlyPheIleProIleAlaSerMet245250255LeuThrGlnGlySerIleValAspValMetLysAsnGluLeuSerLys260265270LeuSerTyrMetTrpAsnProIleAlaAspLeuProArgAspIlePro275280285GlyAspLeuPheThrProAlaAlaThrAlaTyrTrpGluLeuLeuAsn290295300AsnTyrValGluGlnGlyLeuLeuGlnProPheGluAspGluLeuArg305310315320ThrGluValAsnAlaIleGlnValAspGluLeuPheAlaGluLeuLys325330335GluArgSerLeuTyrSerGlyAspGlnProProLysTyrAspSerSer340345350GluLeuLysSerLeuLeuMetTyrIleIleTyrHisSerSerPheLeu355360365HisSerTrpAlaAsnPheLysGlnTyrAspAspAlaGlyAsnProAsn370375380HisValSerMetGlyAspTyrSerGlnTyrAspGlnGlnThrGlnAsp385390395400LysIleArgPheSerGlnArgSerLeuThrTrpValLeuSerSerIle405410415ArgTyrAsnSerValAlaValTyrGlySerAspLeuLeuLysGlnLeu420425430IleArgGluLysThrSerIleLeuGluProGlyLeuProLeuGluAsp435440445LeuMetMetSerIleAsnIle450455<210>5<211>455<212>PRT<213>魚腥藻脂肪氧合酶N130D/G260Q突變體氨基酸序列<400>5GlyValSerGlyAlaLeuValHisTyrPheGlySerIleValArgAla151015GluArgThrGlnTyrLeuTyrGlySerLysAspAspLeuProGlyLys202530ProValTyrPheProLeuProValThrGluIleProSerLysArgPhe354045LeuPheLeuLeuGluLysTyrAsnPheLeuThrAspAsnSerTyrPro505560SerAspGlyGluHisAspLysIleGluAlaLeuValSerAlaMetPro65707580ThrThrAlaLeuAspLeuAlaValGlyThrThrAspProThrAspIle859095ProAspSerTyrPheLeuGluArgArgLeuAsnGlyTyrAsnProGly100105110AlaIleArgGluSerSerGlyGlnGluGlyTrpThrHisGluLeuThr115120125HisAspLeuAlaLysTyrAspIleLysProGlyLeuHisPheProAsp130135140PheValGlnCysArgLeuPheValAspLysGlnAsnGlyValLysLeu145150155160HisSerIleLysIleAspAspHisGluIleThrProCysGlnGluGln165170175TrpGlnTyrAlaLysArgThrTyrLeuGlnAlaGluPheLeuSerGln180185190GluLeuLysLeuHisLeuAlaArgCysHisPheAsnIleGluGlnTyr195200205ValMetAlaIleLysArgArgLeuAlaProThrHisProValArgAla210215220PheIleAsnProHisLeuGluGlyLeuIlePheIleAsnSerSerAla225230235240ValProLysIleIleGlySerThrGlyPheIleProIleAlaSerMet245250255LeuThrGlnGlnSerIleValAspValMetLysAsnGluLeuSerLys260265270LeuSerTyrMetTrpAsnProIleAlaAspLeuProArgAspIlePro275280285GlyAspLeuPheThrProAlaAlaThrAlaTyrTrpGluLeuLeuAsn290295300AsnTyrValGluGlnGlyLeuLeuGlnProPheGluAspGluLeuArg305310315320ThrGluValAsnAlaIleGlnValAspGluLeuPheAlaGluLeuLys325330335GluArgSerLeuTyrSerGlyAspGlnProProLysTyrAspSerSer340345350GluLeuLysSerLeuLeuMetTyrIleIleTyrHisSerSerPheLeu355360365 HisSerTrpAlaAsnPheLysGlnTyrAspAspAlaGlyAsnProAsn370375380HisValSerMetGlyAspTyrSerGlnTyrAspGlnGlnThrGlnAsp385390395400LysIleArgPheSerGlnArgSerLeuThrTrpValLeuSerSerIle405410415ArgTyrAsnSerValAlaValTyrGlySerAspLeuLeuLysGlnLeu420425430IleArgGluLysSerSerIleLeuGluProGlyLeuProLeuGluAsp435440445LeuMetMetSerIleAsnIle450455<210>6<211>455<212>PRT<213>魚腥藻脂肪氧合酶N130D/S437Y突變體氨基酸序列<400>6GlyValSerGlyAlaLeuValHisTyrPheGlySerIleValArgAla151015GluArgThrGlnTyrLeuTyrGlySerLysAspAspLeuProGlyLys202530ProValTyrPheProLeuProValThrGluIleProSerLysArgPhe354045LeuPheLeuLeuGluLysTyrAsnPheLeuThrAspAsnSerTyrPro505560SerAspGlyGluHisAspLysIleGluAlaLeuValSerAlaMetPro65707580ThrThrAlaLeuAspLeuAlaValGlyThrThrAspProThrAspIle859095ProAspSerTyrPheLeuGluArgArgLeuAsnGlyTyrAsnProGly100105110AlaIleArgGluSerSerGlyGlnGluGlyTrpThrHisGluLeuThr115120125HisAspLeuAlaLysTyrAspIleLysProGlyLeuHisPheProAsp130135140PheValGlnCysArgLeuPheValAspLysGlnAsnGlyValLysLeu145150155160HisSerIleLysIleAspAspHisGluIleThrProCysGlnGluGln165170175TrpGlnTyrAlaLysArgThrTyrLeuGlnAlaGluPheLeuSerGln180185190GluLeuLysLeuHisLeuAlaArgCysHisPheAsnIleGluGlnTyr195200205ValMetAlaIleLysArgArgLeuAlaProThrHisProValArgAla210215220PheIleAsnProHisLeuGluGlyLeuIlePheIleAsnSerSerAla225230235240ValProLysIleIleGlySerThrGlyPheIleProIleAlaSerMet245250255LeuThrGlnGlySerIleValAspValMetLysAsnGluLeuSerLys260265270LeuSerTyrMetTrpAsnProIleAlaAspLeuProArgAspIlePro275280285GlyAspLeuPheThrProAlaAlaThrAlaTyrTrpGluLeuLeuAsn290295300AsnTyrValGluGlnGlyLeuLeuGlnProPheGluAspGluLeuArg305310315320ThrGluValAsnAlaIleGlnValAspGluLeuPheAlaGluLeuLys325330335GluArgSerLeuTyrSerGlyAspGlnProProLysTyrAspSerSer340345350GluLeuLysSerLeuLeuMetTyrIleIleTyrHisSerSerPheLeu355360365HisSerTrpAlaAsnPheLysGlnTyrAspAspAlaGlyAsnProAsn370375380HisValSerMetGlyAspTyrSerGlnTyrAspGlnGlnThrGlnAsp385390395400LysIleArgPheSerGlnArgSerLeuThrTrpValLeuSerSerIle405410415ArgTyrAsnSerValAlaValTyrGlySerAspLeuLeuLysGlnLeu420425430IleArgGluLysTyrSerIleLeuGluProGlyLeuProLeuGluAsp435440445LeuMetMetSerIleAsnIle450455<210>7<211>32<212>DNA<213>人工序列N130-f<220><221>misc_feature<222>(9)..(10)<223>nisa,c,g,ort<400>7ttactcacnnkctggcaaaatatgacatcaag32<210>8<211>28<212>DNA<213>人工序列N130-r<220><221>misc_feature<222>(10)..(11)<223>nisa,c,g,ort<400>8tttgccagmnngtgagtaagctcatgtg28<210>9<211>32<212>DNA<213>人工序列S437-f<220><221>misc_feature<222>(11)..(12)<223>nisa,c,g,ort<400>9ggaaaaatcannkatattggaaccaggacttc32<210>10<211>31<212>DNA<213>人工序列S437-r<220><221>misc_feature<222>(10)..(11)<223>nisa,c,g,ort<400>10tccaatatmnntgatttttcccgaatgagcg31<210>11<211>29<212>DNA<213>人工序列G260-f<220><221>misc_feature<222>(11)..(12)<223>nisa,c,g,ort<400>11gctaacgcagnnktctattgttgatgtaa29<210>12<211>25<212>DNA<213>人工序列G260-r<220><221>misc_feature<222>(11)..(12)<223>nisa,c,g,ort<400>12aacaatagamnnctgcgttagcatg25當(dāng)前第1頁(yè)1 2 3 
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