本發(fā)明屬于基因工程領(lǐng)域,具體涉及一類耐熱型植酸酶突變體及其編碼基因和應(yīng)用。
背景技術(shù):
:植物性飼料中含有大量的植酸磷,但這些植酸磷不能被單胃畜禽動(dòng)物有效地利用,造成了無機(jī)磷的浪費(fèi),同時(shí)未被利用的磷源通過糞便排泄到環(huán)境中,導(dǎo)致了環(huán)境污染。此外,植酸磷還是一種抗?fàn)I養(yǎng)因子,它在動(dòng)物胃腸道中會(huì)與多種金屬離子如鈣、鎂、鋅、鐵等以及蛋白質(zhì)鰲合形成不溶性復(fù)合物,降低了動(dòng)物對(duì)這些營養(yǎng)物質(zhì)的有效利用。植酸酶是催化植酸及其鹽類水解為肌醇與磷酸鹽的一類酶的總稱,它可以催化肌醇六磷酸(鹽或醋)脫掉磷酸基團(tuán),從而分解動(dòng)物飼料中的天然有機(jī)磷。在飼料中添加植酸酶可以代替部分磷酸氫鈣,同時(shí)降低動(dòng)物糞便中的磷,減少了集約化畜牧場(chǎng)排除糞便中磷對(duì)環(huán)境的污染。目前,市場(chǎng)中的植酸酶多數(shù)有比較好的活性,但是很多耐熱性能一般。通常飼料生產(chǎn)中,酶制劑與飼料混勻后在80℃左右的高溫造粒,在此過程中酶易變性失活,解決這一問題的一種方法是利用包被劑和載體來提高酶的耐熱性,但這無疑會(huì)增加酶制劑的生產(chǎn)成本,而且采用包被處理酶制劑會(huì)嚴(yán)重影響其生物利用率;另一種經(jīng)濟(jì)有效的方法就是通過改良酶的基因提高其耐熱性。從酶的基因和結(jié)構(gòu)入手,篩選得到耐熱型植酸酶對(duì)降低目前飼用植酸酶的生產(chǎn)成本,提高其利用效率具有重要的意義。技術(shù)實(shí)現(xiàn)要素:本發(fā)明的發(fā)明目的是提供了一類耐熱型植酸酶突變體及其編碼基因和應(yīng)用,本發(fā)明通過人工基因突變和大量篩選的方法,對(duì)大腸桿菌來源的植酸酶ghph-1(氨基酸序列seqidno:2,編碼的核苷酸序列seqidno:1)進(jìn)行改良,優(yōu)選地,首先在ghph-1的第63位點(diǎn)進(jìn)行定點(diǎn)飽和突變,篩選得到熱穩(wěn)定性提高的突變體ghph-c,繼續(xù)以ghph-c為模板用易錯(cuò)pcr的方法對(duì)該基因進(jìn)行二輪隨機(jī)突變,經(jīng)過大批量篩選,得到熱穩(wěn)定性進(jìn)一步提高的突變體ghph-c1、ghph-c2、ghph-c3、ghph-c4、ghph-c5、ghph-c6和ghph-c7。為實(shí)現(xiàn)上述發(fā)明目的,本發(fā)明采用以下技術(shù)方案予以實(shí)現(xiàn):本發(fā)明提供了耐熱型單位點(diǎn)植酸酶突變體ghph-c,所述的植酸酶突變體ghph-c的氨基酸序列如seqidno:3所示,所述突變體ghph-c由氨基酸序列為seqidno:2的植酸酶的第63位氨基酸由arg變?yōu)閏ys獲得。本發(fā)明提供了耐熱型雙位點(diǎn)植酸酶突變體,所述雙位點(diǎn)植酸酶突變體包括:氨基酸序列如seqidno:4所示的ghph-c1、氨基酸序列如seqidno:5所示的ghph-c2、氨基酸序列如seqidno:6所示的ghph-c3和氨基酸序列如seqidno:7所示的ghph-c4。本發(fā)明提供了耐熱型三位點(diǎn)植酸酶突變體,所述三位點(diǎn)植酸酶突變體包括氨基酸序列如seqidno:8所示的ghph-c5和氨基酸序列如seqidno:9所示的ghph-c6。本發(fā)明提供了耐熱型五位點(diǎn)植酸酶突變體ghph-c7,其具有如seqidno:10所示的氨基酸序列。本發(fā)明提供了分別產(chǎn)生所述的植酸酶突變體的編碼基因。本發(fā)明提供了含有所述的植酸酶突變體的編碼基因的重組菌株。所述重組菌株為畢赤酵母gs115。本發(fā)明提供了所述的植酸酶突變體在用于制備水產(chǎn)類養(yǎng)殖飼料中的應(yīng)用。本發(fā)明提供了所述的植酸酶突變體在用于制備畜禽類養(yǎng)殖飼料中的應(yīng)用,所述畜禽類包括豬、肉雞、蛋雞和鴨。進(jìn)一步的:所述植酸酶突變體用于飼料中時(shí)以液體酶制劑或固體酶制劑形式混勻在飼料中使用,其使用量為每克飼料中包含1~10u植酸酶。與現(xiàn)有技術(shù)相比,本發(fā)明的優(yōu)點(diǎn)和技術(shù)效果是:本發(fā)明基于seqidno:1的植酸酶ghph-1,所述植酸酶突變體首先在第63位的氨基酸有改變,置換方式為r63c;其次可能在第10位、第29位、第138位、第172位、第207位、第243位、第287位、第297位、第307位和第397位中一個(gè)或多個(gè)位置的氨基酸有改變,相應(yīng)的置換方式為:s10n、m29f、a138l、f172w、l207e、w243p、q287s、v297m、l307p、g311k和t397e。本發(fā)明以植酸酶ghph-1為基礎(chǔ),提供了包含r63c的單點(diǎn)突變體ghph-c,包含r63c/s10n的雙位點(diǎn)突變體ghph-c1、包含r63c/f172w的雙位點(diǎn)突變體ghph-c2、包含r63c/l207e的雙位點(diǎn)突變體ghph-c3、包含r63c/q287s的雙位點(diǎn)突變體ghph-c4;包含r63c/a138l/v297m的三位點(diǎn)突變體ghph-c5、包含r63c/f172w/g311k的三位點(diǎn)突變體ghph-c6;以及包含r63c/m29f/a138l/w243p/l307p的五位點(diǎn)突變體ghph-c7。本發(fā)明根據(jù)所取代的位置和氨基酸,與原始植酸酶ghph-1相比,改造后的突變體ghph-c以及ghph-c1、ghph-c2、ghph-c3、ghph-c4、ghph-c5、ghph-c6、ghph-c7在80℃處理3分鐘時(shí)的熱穩(wěn)定性是原來的1.9~3.3倍;同時(shí)得到的植酸酶突變體ghph-c6適應(yīng)的ph范圍更廣泛,在ph3~4的酸性環(huán)境中其相對(duì)酶活較未突變的ghph-1約提高了35%~60%,而ghph-c2和ghph-c6抵抗蛋白酶的降解能力有所提高,約為未突變的2倍。通過本發(fā)明技術(shù)方案得到的植酸酶可以有利于植酸酶在飼料中的廣泛應(yīng)用。附圖說明圖1表明本發(fā)明所述植酸酶突變體的熱穩(wěn)定性;圖2是本發(fā)明所述植酸酶突變體ghph-c6溫度曲線;圖3表明本發(fā)明所述植酸酶突變體對(duì)胃蛋白酶的耐受性。具體實(shí)施方式為了便于理解本發(fā)明,以下將結(jié)合較佳的實(shí)施例對(duì)本文發(fā)明做更全面、細(xì)致地描述,但本發(fā)明的保護(hù)范圍并不限于以下具體實(shí)施例。以下實(shí)施例中未作具體說明的分子生物學(xué)實(shí)驗(yàn)方法,可以參照《分子克隆實(shí)驗(yàn)指南》(第三版)j.薩姆布魯克一書中所列的具體方法進(jìn)行,或者按照試劑盒和產(chǎn)品說明書進(jìn)行。具體實(shí)施例中使用的試劑和生物材料如無特殊說明均可從商業(yè)途徑獲得。1.菌株和載體畢赤酵母gs115,質(zhì)粒ppic9k,大腸桿菌dh5α,大腸桿菌origamib,大腸桿菌bl21,質(zhì)粒pet21a(+)購自invitrogen公司。2.試劑與培養(yǎng)基質(zhì)粒提取試劑盒,片段純化回收試劑盒,限制性內(nèi)切酶等購自寶生物工程(大連)有限公司;genemorphii隨機(jī)突變pcr試劑盒購自stratagene公司;氨芐青霉素,iptg等購自生工生物工程(上海)股份有限公司。lb培養(yǎng)基:1%胰蛋白胨,0.5%酵母提取物,1%nacl;md培養(yǎng)基:1.34%ynb,0.4mg/l生物素,2%葡萄糖;ypd培養(yǎng)基:1%酵母提取物,2%蛋白胨,2%葡萄糖;bmgy培養(yǎng)基:1%酵母提取物,2%蛋白胨,100mmol/l磷酸鉀緩沖液(ph6.0),1.34%ynb,0.4mg/l生物素,1%甘油;bmmy培養(yǎng)基:1%酵母提取物,2%蛋白胨,100mmol/l磷酸鉀緩沖液(ph6.0),1.34%ynb,0.4mg/l生物素,1%甲醇;bsm培養(yǎng)基:26.7ml85%的磷酸,0.93g二水硫酸鈣,14.9g二水硫酸鎂,4.13g氫氧化鉀,18.2g硫酸鉀,40g甘油,4.0mllpmt1。以上培養(yǎng)基為固體時(shí)加入2%的瓊脂粉。3.實(shí)驗(yàn)方法菌株培養(yǎng)條件:大腸桿菌37℃培養(yǎng),酵母30℃培養(yǎng)。液體培養(yǎng)時(shí)搖床轉(zhuǎn)速為200rpm。畢赤酵母gs115轉(zhuǎn)化方法:將活化的畢赤酵母gs115接種到含有20mlypd液體培養(yǎng)基中,30℃搖瓶培養(yǎng)至od600為1.2~1.5后低溫離心收集菌體,依次用20ml冰冷無菌水和5ml濃度為1mol/l的冰冷山梨醇溶液清洗菌體,最后用1ml山梨醇溶液重懸菌體制得酵母感受態(tài)懸液。將100μl酵母感受態(tài)與10μl線性化載體混勻后轉(zhuǎn)移到預(yù)冷的電轉(zhuǎn)杯中電擊轉(zhuǎn)化,電轉(zhuǎn)化的條件為1.5kv,6msec。電擊后加入1ml山梨醇溶液,轉(zhuǎn)移至1.5ml離心管中30℃溫育1h。5000rpm離心5min,收集菌體涂布于md篩選平板上倒置培養(yǎng),直至長(zhǎng)出陽性單克隆。植酸酶活性檢測(cè)根據(jù)中華人民共和國國家標(biāo)準(zhǔn)《gb/t18634一2009》進(jìn)行;植酸酶活性定義是指樣品在溫度37℃、ph值5.5的條件下,每分鐘從5.0mmol/l植酸鈉中釋放1μmol無機(jī)磷,即為一個(gè)植酸酶活性單位,以u(píng)表示。實(shí)施例1:植酸酶基因的合成參考ghph-1的氨基酸序列(氨基酸序列如seqidno:2所示),人工合成該基因(核苷酸序列如seqidno:1所示),根據(jù)基因5’端設(shè)計(jì)ecorⅰ的引物,根據(jù)3’端設(shè)計(jì)notⅰ的引物引物序列如下:f-ghph-ecorⅰ:5’-agaattccaatccgaaccagaattaaa-3’(seqidno:11);r-ghph-not?。?’-agcggccgctcaaagagaacaggcaggaat-3’(seqidno:12)。以合成基因ghph-1為模板,用上述引物進(jìn)行pcr擴(kuò)增,將擴(kuò)增得到的片段切膠回收,用ecorⅰ和notⅰ雙酶切,連接到pet-21a(+)載體上,轉(zhuǎn)化大腸桿菌dh5α,氨芐青霉素抗性lb平板篩選陽性克隆,測(cè)序驗(yàn)證得到pet-ghph。實(shí)施例2:植酸酶定點(diǎn)突變體篩選確定大腸桿菌植酸酶ghph-1的第63位的arg為待突變位點(diǎn),針對(duì)性的設(shè)計(jì)飽和突變引物。ghph-63f:5’-gggacattactggnnncaacgtcttgttgct-3’(seqidno:13);ghph-63r:5’-caacaagacgttgnnnccagtaatgtcccaa-3’(seqidno:14)。其中n代表a、t、c、g四種堿基。以重組載體pet-ghph為模板,加入突變位點(diǎn)的引物,用高保真酶進(jìn)行pcr擴(kuò)增,產(chǎn)物經(jīng)dpnⅰ酶切處理后電擊轉(zhuǎn)化origamib大腸桿菌感受態(tài)細(xì)胞,在含amp的lb平板上篩選陽性克隆。將單克隆接種到96孔深孔板。每個(gè)平板接入2個(gè)原始克隆為對(duì)照。每孔裝入300ullb液體培養(yǎng)基(含有100μg/ml氨芐青霉素),37℃200rpm震蕩培養(yǎng)4小時(shí)后,轉(zhuǎn)移50ul菌液到新的96孔平板保種,在平板剩余菌液中添加200ul含有iptg的lb-amp培養(yǎng)基,使iptg終濃度為1mm,氨芐青霉素終濃度為100μg/ml,37℃200rpm搖床培養(yǎng)10h誘導(dǎo)表達(dá)植酸酶。將誘導(dǎo)完成的菌液在80℃水浴3min破碎后,檢測(cè)植酸酶的剩余活性。將剩余酶活高于對(duì)照的突變體基因進(jìn)行測(cè)序。最終篩選到以ghph-1為出發(fā)模板的耐熱性提高的突變體r63c(第63位氨基酸由arg突變?yōu)閏ys),命名為ghph-c(氨基酸序列如seqidno:3所示)。實(shí)施例3:植酸酶隨機(jī)突變體篩選用genemorphii隨機(jī)突變pcr試劑盒(stratagene)將上述篩選到的ghph-c進(jìn)行隨機(jī)突變,同時(shí)用高保真酶擴(kuò)增ghph-1的基因序列構(gòu)建對(duì)照,使用的引物序列如下:f-ghph-ecor?。?’-agaattccaatccgaaccagaattaaa-3’;r-ghph-not?。?’-agcggccgctcaaagagaacaggcaggaat-3’。將切膠回收后的上述pcr產(chǎn)物和pet21a(+)載體用限制性內(nèi)切酶ecorⅰ和notⅰ進(jìn)行雙酶切,純化后的片段和pet21a(+)連接構(gòu)建表達(dá)載體pet-phym,轉(zhuǎn)化至大腸桿菌bl21中,在含有100μg/ml氨芐青霉素的lb平板篩選陽性轉(zhuǎn)化子。得到ghph-1及隨機(jī)突變體的大腸桿菌表達(dá)菌株。將單克隆接種到96孔深孔板。每個(gè)平板接入2個(gè)原始克隆為對(duì)照。每孔裝入300ullb液體培養(yǎng)基(含有100μg/ml氨芐青霉素),37℃200rpm震蕩培養(yǎng)4h后,轉(zhuǎn)移50ul菌液到新的96孔平板保種,在平板剩余菌液中添加200ul含有iptg的lb-amp培養(yǎng)基,使iptg終濃度為1mm,氨芐青霉素終濃度為100μg/ml,37℃200rpm搖床培養(yǎng)10h誘導(dǎo)表達(dá)植酸酶。將誘導(dǎo)完成的菌液在80℃水浴3min破碎后,檢測(cè)植酸酶的剩余活性。將剩余酶活高于對(duì)照的突變體基因進(jìn)行測(cè)序。結(jié)果獲得以下突變體:ghph-c第10位的突變體r63c/s10n(命名為ghph-c1),氨基酸序列如seqidno:4所示。ghph-c第172位的突變體r63c/f172w(命名為ghph-c2),氨基酸序列如seqidno:5所示。ghph-c第207位的突變體r63c/l207e(命名為ghph-c3),氨基酸序列如seqidno:6所示。ghph-c第287位的突變體r63c/q287s(命名為ghph-c4),氨基酸序列如seqidno:7所示。ghph-c第138位和第297位同時(shí)突變的突變體r63c/a138l/v297m(命名為ghph-c5),氨基酸序列如seqidno:8所示。ghph-c第172位和第311位同時(shí)突變的突變體r63c/f172w/g311k(命名為ghph-c6),氨基酸序列如seqidno:9所示。ghph-c第29位,第138位,第243位,第307位同時(shí)突變的突變體r63c/m29f/a138l/w243p/l307p(命名為ghph-c7),熱穩(wěn)定性較隨機(jī)突變前有明顯提高,氨基酸序列如seqidno:10所示。實(shí)施例4:耐熱型植酸酶在畢赤酵母中的表達(dá)驗(yàn)證人工合成上述篩選到的植酸酶突變體基因,并構(gòu)建到ppic9k質(zhì)粒上,得到各突變體在畢赤酵母中的表達(dá)載體ppic-phym;將各突變體的表達(dá)載體用salⅰ酶切線性化后電轉(zhuǎn)入畢赤酵母gs115中,md平板篩選得到各突變體表達(dá)菌株的轉(zhuǎn)化子并轉(zhuǎn)接到y(tǒng)pd平板中活化。挑取活化后的轉(zhuǎn)化子接于bmgy培養(yǎng)基中,30℃振蕩培養(yǎng)18h后,離心獲得菌體。將適量菌體轉(zhuǎn)入bmmy培養(yǎng)基中,使菌體濃度達(dá)到od600=1,繼續(xù)振蕩培養(yǎng),每24h添加培養(yǎng)體積1%的甲醇。誘導(dǎo)表達(dá)96h后,將培養(yǎng)液離心獲得上清,測(cè)定發(fā)酵液上清中植酸酶活力和熱穩(wěn)定性,結(jié)果顯示突變后得到的植酸酶ghph-c、ghph-c1、ghph-c2、ghph-c3、ghph-c4、ghph-c5、ghph-c6、ghph-c7在80℃處理3min后耐熱性較ghph-1分別提高了0.95倍、1.53倍、2.01倍、1.98倍、1.87倍、1.61倍、2.26倍和2.10倍。以上結(jié)果表明將ghph-c第10位的ser突變?yōu)閍sn得到的突變體;或?qū)⑵涞?72位的phe突變?yōu)閠rp得到的突變體;或?qū)⑵涞?07位的leu突變?yōu)間lu得到的突變體;或?qū)⑵涞?87位的gln突變?yōu)閟er得到的突變體;或?qū)⑵涞?38位的ala突變?yōu)閘eu,同時(shí)第297位的val突變?yōu)閙et得到的突變體;或?qū)⑵涞?72位的phe突變?yōu)閠rp,同時(shí)第311位的gly突變?yōu)閘ys得到的突變體;或?qū)⑵涞?9位的met突變?yōu)閜he,同時(shí)第138位的ala突變?yōu)閘eu,第243位的trp突變?yōu)閜ro,第307位的leu突變?yōu)閜ro得到的突變體,其耐熱性有進(jìn)一步提高。實(shí)施例5:植酸酶突變體在10l發(fā)酵罐中制備將保種于甘油管中的畢赤酵母劃線于ypd平板上,30℃倒置培養(yǎng)3天長(zhǎng)出單菌落,挑取長(zhǎng)勢(shì)良好的單菌落繼續(xù)在ypd平板上劃線培養(yǎng),如此活化三代得到的畢赤酵母單菌落接種于20mlbmgy培養(yǎng)基中,30℃、200rpm培養(yǎng)24h。以2%的接種量接種到300mlbmgy培養(yǎng)基中,30℃、200rpm培養(yǎng)至od600為5,用作種子液接種發(fā)酵罐。發(fā)酵生產(chǎn)工藝:bsm培養(yǎng)基,ph4.8、溫度30℃、攪拌速率500rpm、通風(fēng)量1.5(v/v),溶氧控制在20%以上發(fā)酵過程分為三個(gè)階段:(1)菌體培養(yǎng)階段:按8%比例接入種子液,30℃培養(yǎng)20~24h,使發(fā)酵液中甘油耗盡;(2)饑餓階段:當(dāng)碳源甘油耗盡后,暫不補(bǔ)加任何碳源,待溶氧上升至80%饑餓階段結(jié)束;(3)誘導(dǎo)表達(dá)階段:用氨水或磷酸調(diào)節(jié)ph至所需值,流加甲醇誘導(dǎo),并且保持溶氧在20%以上,誘導(dǎo)時(shí)間為160~200h;待發(fā)酵結(jié)束后,發(fā)酵液通過板框過濾機(jī)處理得到粗酶液,用于酶學(xué)性質(zhì)和應(yīng)用測(cè)試。實(shí)施例6:植酸酶突變體的其它酶學(xué)性質(zhì)分析按照常規(guī)方法對(duì)實(shí)施例5中得到粗酶液的ph曲線及胃蛋白酶耐受性進(jìn)行測(cè)定。對(duì)各突變體的ph曲線測(cè)定(ph3.0~8.0),ghph-c、ghph-c1、ghph-c2、ghph-c3、ghph-c4、ghph-c5和ghph-c7與未突變的植酸酶ghph-1比較,其反應(yīng)ph曲線基本無差異,最適ph均為5.0;ghph-c6的最適ph仍為5.0,但是在ph3~4條件下,其相對(duì)酶活明顯高于ghph-1(圖2),說明改造后的ghph-c6適應(yīng)的ph范圍更廣泛,尤其是在酸性環(huán)境中,能更好的發(fā)揮作用。用胃蛋白酶對(duì)植酸酶突變體進(jìn)行處理(蛋白酶:植酸酶=1:200,ph3.0,37℃處理1h),結(jié)果如圖3所示。與ghph-1相比,ghph-c、ghph-c1、ghph-c2、ghph-c3、ghph-c4、ghph-c5、ghph-c6、ghph-c7對(duì)抵抗胃蛋白酶降解的能力基本無差異,但ghph-c2和ghph-c6抗胃蛋白的能力有所提高,剩余的相對(duì)酶活力由39.86%分別提高到68.55%和72.36%。實(shí)施例7:植酸酶突變體在水產(chǎn)養(yǎng)殖中的應(yīng)用試驗(yàn)產(chǎn)品:20000u/ml的液體植酸酶ghph-c6。將液體植酸酶按照每千克飼料2000u植酸酶的比例噴涂到沉水魚糧中,對(duì)水產(chǎn)養(yǎng)殖場(chǎng)中進(jìn)行試驗(yàn);其中對(duì)照1是普通沉水魚糧喂養(yǎng)草魚(添加10kg/t磷酸二氫鈣),對(duì)照2為沉水魚糧(添加2kg/t磷酸二氫鈣)喂養(yǎng)草魚;試驗(yàn)組為沉水魚糧(添加2kg/t磷酸二氫鈣,同時(shí)添加2000u/kg的本實(shí)施例中制備的植酸酶ghph-c6),試驗(yàn)結(jié)果如表1所示。表1植酸酶突變體ghph-c6在草魚養(yǎng)殖中使用效果對(duì)照1對(duì)照2試驗(yàn)組增重率(%)298.34±12.43236.54±8.92310.67±10.63肥滿度1.961±0.0922.040±0.0731.981±0.065飼料系數(shù)1.753±0.0682.116±0.0531.672±0.091實(shí)施例8:植酸酶突變體在畜禽類養(yǎng)殖中的應(yīng)用試驗(yàn)材料:5000u/g植酸酶成品ghph-c6選取體重相近和產(chǎn)蛋性能相似的30周齡產(chǎn)蛋高峰期羅曼蛋雞1200只,隨機(jī)分為4個(gè)處理,每處理組5重復(fù),每一重復(fù)60只雞。試驗(yàn)共進(jìn)行10周,在正式試驗(yàn)進(jìn)行前預(yù)試一周,試驗(yàn)期間每天添料2次(7:00/14:00),每天光照時(shí)長(zhǎng)16h,前5周溫度為10°c,后5周溫度為15°c,每天下午16:00撿蛋并稱重。對(duì)照組基礎(chǔ)日糧(i組)參照中華人民共和國農(nóng)業(yè)行業(yè)標(biāo)準(zhǔn)中褐殼蛋雞(產(chǎn)蛋率>85%)營養(yǎng)需要推薦值配制(有效磷0.36%),處理ii組在基礎(chǔ)日糧中降低有效磷至0.22%,處理iii組及處理iv組分別在處理ii組基礎(chǔ)上添加100g和300g植酸酶。每周以重復(fù)為單位觀察記錄雞的產(chǎn)蛋枚數(shù)、破蛋數(shù)、蛋重、死亡情況等,計(jì)算日平均產(chǎn)蛋率、平均蛋重、破蛋率和死亡率,結(jié)果如表2。表2植酸酶突變體ghph-c6蛋雞養(yǎng)殖中的使用效果處理產(chǎn)蛋率(%)平均蛋重(g)料蛋比破蛋率(%)死亡率(%)i96.6±0.6260.4±0.222.24±0.051.6±0.192.27±0.12ii95.7±0.4860.0±0.272.26±0.042.4±0.173.05±0.27iii96.5±0.4960.4±0.192.25±0.042.0±0.133.01±0.19iv96.8±0.5660.9±0.112.25±0.061.7±0.142.19±0.13注:同列上標(biāo)小寫字母不同者表示差異顯著(p<0.05)與未添加植酸酶的ii組相比,添加植酸酶的iii和iv組,其產(chǎn)蛋率、平均蛋重、和平均增重都有所提高,而料蛋比、破蛋率和死亡率有所降低,這說明本發(fā)明的植酸酶突變體有利于ghph-c6蛋雞的生長(zhǎng)和產(chǎn)蛋,且在實(shí)驗(yàn)范圍內(nèi)增加植酸酶ghph-c6的添加量使蛋雞的生長(zhǎng)和產(chǎn)蛋狀況有進(jìn)一步改善。改良后植酸酶突變體的熱穩(wěn)定性有顯著提高,同時(shí)能改善草魚的增重狀況以及蛋雞的生長(zhǎng)產(chǎn)蛋狀況,由此推測(cè)在飼料行業(yè)中會(huì)有很好的應(yīng)用前景。以上實(shí)施例僅用以說明本發(fā)明的技術(shù)方案,而非對(duì)其進(jìn)行限制;盡管參照前述實(shí)施例對(duì)本發(fā)明進(jìn)行了詳細(xì)的說明,對(duì)于本領(lǐng)域的普通技術(shù)人員來說,依然可以對(duì)前述實(shí)施例所記載的技術(shù)方案進(jìn)行修改,或者對(duì)其中部分技術(shù)特征進(jìn)行等同替換;而這些修改或替換,并不使相應(yīng)技術(shù)方案的本質(zhì)脫離本發(fā)明所要求保護(hù)的技術(shù)方案的精神和范圍。sequencelisting<110>青島紅櫻桃生物技術(shù)有限公司<120>一類耐熱型植酸酶突變體及其編碼基因和應(yīng)用<130><160>14<170>patentinversion3.3<210>1<211>1233<212>dna<213>人工序列<400>1caatccgaaccagaattaaagcttgaatccgttgttattgtttctagacatggtgttcgt60gcccctactaagtttacccaacttatgcaagatgttactccagatgcctggccaacctgg120ccagttaagttaggagaattgacccctagaggtggtgaattgattgcctacttgggacat180tactggcgtcaacgtcttgttgctgatgaacttttgcctaagtgtggatgtcctcaatca240ggacaagttgctattattgccgatgttgatgaacgtacccgtaagactggagaagccttt300gctgccggtttagcccctgattgtgctattaccgttcatcatcaagccgatacctcatca360cctgatccactcttcaacccattaaagaccggagtttgtcaattagatgttgccaacgtt420actagagccattttggaaagagccggaggatctattgctgattttactggtcattaccaa480accgcctttcgtgaattggaaagagttcttaactttccacaatctaacttgtgtcttaag540cgtgaaaagcaagatgaatcatgttccttgactcaagctcttccatccgaacttaaggtt600tccgccgataacgtttccttgactggtgctgtttcattagcctctatgcttaccgaaatt660tttcttttacaacaagctcaaggtatgccagaaccaggatggggtcgtattaccgattca720catcagtggaacactcttttgtcacttcataacgcccaatttgatcttcttcaacgtacc780cctgaagttgctcgatctcgtgctactccacttctggatcttattaagaccgctttgact840cctcatccaccacaaaagcaagcctacggtgttactcttcctacctccgttttattcatt900gccggacatgatactaacttagctaacttgggaggagctttggaattaaactggaccctt960ccaggtcaaccagataacactccaccaggtggagaattggtttttgaaagatggcgtcgt1020ctttcagataactcacagtggattcaagtttcattggtttttcaaaccttgcaacaaatg1080cgtgataagactccattgtccttaaacaccccaccaggagaagttaagttgaccttggcc1140ggttgtgaagaacgtaacgcccaaggtatgtgttccttagccgggtttacccaaattgtt1200aacgaagctcgtattcctgcctgttctctttga1233<210>2<211>410<212>prt<213>人工序列<400>2glnsergluprogluleulysleugluservalvalilevalserarg151015hisglyvalargalaprothrlysphethrglnleumetglnaspval202530thrproaspalatrpprothrtrpprovallysleuglygluleuthr354045proargglyglygluleuilealatyrleuglyhistyrtrparggln505560argleuvalalaaspgluleuleuprolyscysglycysproglnser65707580glyglnvalalaileilealaaspvalaspgluargthrarglysthr859095glyglualaphealaalaglyleualaproaspcysalailethrval100105110hishisglnalaaspthrserserproaspproleupheasnproleu115120125lysthrglyvalcysglnleuaspvalalaasnvalthrargalaile130135140leugluargalaglyglyserilealaaspphethrglyhistyrgln145150155160thralaphearggluleugluargvalleuasnpheproglnserasn165170175leucysleulysargglulysglnaspglusercysserleuthrgln180185190alaleuprosergluleulysvalseralaaspasnvalserleuthr195200205glyalavalserleualasermetleuthrgluilepheleuleugln210215220glnalaglnglymetprogluproglytrpglyargilethraspser225230235240hisglntrpasnthrleuleuserleuhisasnalaglnpheaspleu245250255leuglnargthrprogluvalalaargserargalathrproleuleu260265270aspleuilelysthralaleuthrprohisproproglnlysglnala275280285tyrglyvalthrleuprothrservalleupheilealaglyhisasp290295300thrasnleualaasnleuglyglyalaleugluleuasntrpthrleu305310315320proglyglnproaspasnthrproproglyglygluleuvalpheglu325330335argtrpargargleuseraspasnserglntrpileglnvalserleu340345350valpheglnthrleuglnglnmetargasplysthrproleuserleu355360365asnthrproproglygluvallysleuthrleualaglycysgluglu370375380argasnalaglnglymetcysserleualaglyphethrglnileval385390395400asnglualaargileproalacysserleu405410<210>3<211>410<212>prt<213>人工序列<400>3glnsergluprogluleulysleugluservalvalilevalserarg151015hisglyvalargalaprothrlysphethrglnleumetglnaspval202530thrproaspalatrpprothrtrpprovallysleuglygluleuthr354045proargglyglygluleuilealatyrleuglyhistyrtrpcysgln505560argleuvalalaaspgluleuleuprolyscysglycysproglnser65707580glyglnvalalaileilealaaspvalaspgluargthrarglysthr859095glyglualaphealaalaglyleualaproaspcysalailethrval100105110hishisglnalaaspthrserserproaspproleupheasnproleu115120125lysthrglyvalcysglnleuaspvalalaasnvalthrargalaile130135140leugluargalaglyglyserilealaaspphethrglyhistyrgln145150155160thralaphearggluleugluargvalleuasnpheproglnserasn165170175leucysleulysargglulysglnaspglusercysserleuthrgln180185190alaleuprosergluleulysvalseralaaspasnvalserleuthr195200205glyalavalserleualasermetleuthrgluilepheleuleugln210215220glnalaglnglymetprogluproglytrpglyargilethraspser225230235240hisglntrpasnthrleuleuserleuhisasnalaglnpheaspleu245250255leuglnargthrprogluvalalaargserargalathrproleuleu260265270aspleuilelysthralaleuthrprohisproproglnlysglnala275280285tyrglyvalthrleuprothrservalleupheilealaglyhisasp290295300thrasnleualaasnleuglyglyalaleugluleuasntrpthrleu30531031532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354045proargglyglygluleuilealatyrleuglyhistyrtrpcysgln505560argleuvalalaaspgluleuleuprolyscysglycysproglnser65707580glyglnvalalaileilealaaspvalaspgluargthrarglysthr859095glyglualaphealaalaglyleualaproaspcysalailethrval100105110hishisglnalaaspthrserserproaspproleupheasnproleu115120125lysthrglyvalcysglnleuaspvalalaasnvalthrargalaile130135140leugluargalaglyglyserilealaaspphethrglyhistyrgln145150155160thralaphearggluleugluargvalleuasnpheproglnserasn165170175leucysleulysargglulysglnaspglusercysserleuthrgln180185190alaleuprosergluleulysvalseralaaspasnvalserleuthr195200205glyalavalserleualasermetleuthrgluilepheleuleugln210215220glnalaglnglymetprogluproglytrpglyargilethraspser225230235240hisglntrpasnthrleuleuserleuhisasnalaglnpheaspleu245250255leuglnargthrprogluvalalaargserargalathrproleuleu260265270aspleuilelysthralaleuthrprohisproproglnlysserala275280285tyrglyvalthrleuprothrservalleupheilealaglyhisasp290295300thrasnleualaasnleuglyglyalaleugluleuasntrpthrleu305310315320proglyglnproaspasnthrproproglyglygluleuvalpheglu325330335argtrpargargleuseraspasnserglntrpileglnvalserleu340345350valpheglnthrleuglnglnmetargasplysthrproleuserleu355360365asnthrproproglygluvallysleuthrleualaglycysgluglu370375380argasnalaglnglymetcysserleualaglyphethrglnileval385390395400asnglualaargileproalacysserleu405410<210>8<211>410<212>prt<213>人工序列<400>8glnsergluprogluleulysleugluservalvalilevalserarg151015hisglyvalargalaprothrlysphethrglnleumetglnaspval202530thrproaspalatrpprothrtrpprovallysleuglygluleuthr354045proargglyglygluleuilealatyrleuglyhistyrtrpcysgln505560argleuvalalaaspgluleuleuprolyscysglycysproglnser65707580glyglnvalalaileilealaaspvalaspgluargthrarglysthr859095glyglualaphealaalaglyleualaproaspcysalailethrval100105110hishisglnalaaspthrserserproaspproleupheasnproleu115120125lysthrglyvalcysglnleuaspvalleuasnvalthrargalaile130135140leugluargalaglyglyserilealaaspphethrglyhistyrgln145150155160thralaphearggluleugluargvalleuasnpheproglnserasn165170175leucysleulysargglulysglnaspglusercysserleuthrgln180185190alaleuprosergluleulysvalseralaaspasnvalserleuthr195200205glyalavalserleualasermetleuthrgluilepheleuleugln210215220glnalaglnglymetprogluproglytrpglyargilethraspser225230235240hisglntrpasnthrleuleuserleuhisasnalaglnpheaspleu245250255leuglnargthrprogluvalalaargserargalathrproleuleu260265270aspleuilelysthralaleuthrprohisproproglnlysglnala275280285tyrglyvalthrleuprothrsermetleupheilealaglyhisasp290295300thrasnleualaasnleuglyglyalaleugluleuasntrpthrleu305310315320proglyglnproaspasnthrproproglyglygluleuvalpheglu325330335argtrpargargleuseraspasnserglntrpileglnvalserleu340345350valpheglnthrleuglnglnmetargasplysthrproleuserleu355360365asnthrproproglygluvallysleuthrleualaglycysgluglu370375380argasnalaglnglymetcysserleualaglyphethrglnileval385390395400asnglualaargileproalacysserleu405410<210>9<211>410<212>prt<213>人工序列<400>9glnsergluprogluleulysleugluservalvalilevalserarg151015hisglyvalargalaprothrlysphethrglnleumetglnaspval202530thrproaspalatrpprothrtrpprovallysleuglygluleuthr354045proargglyglygluleuilealatyrleuglyhistyrtrpcysgln505560argleuvalalaaspgluleuleuprolyscysglycysproglnser65707580glyglnvalalaileilealaaspvalaspgluargthrarglysthr859095glyglualaphealaalaglyleualaproaspcysalailethrval100105110hishisglnalaaspthrserserproaspproleupheasnproleu115120125lysthrglyvalcysglnleuaspvalalaasnvalthrargalaile130135140leugluargalaglyglyserilealaaspphethrglyhistyrgln145150155160thralaphearggluleugluargvalleuasntrpproglnserasn165170175leucysleulysargglulysglnaspglusercysserleuthrgln180185190alaleuprosergluleulysvalseralaaspasnvalserleuthr195200205glyalavalserleualasermetleuthrgluilepheleuleugln210215220glnalaglnglymetprogluproglytrpglyargilethraspser225230235240hisglntrpasnthrleuleuserleuhisasnalaglnpheaspleu245250255leuglnargthrprogluvalalaargserargalathrproleuleu260265270aspleuilelysthralaleuthrprohisproproglnlysglnala275280285tyrglyvalthrleuprothrservalleupheilealaglyhisasp290295300thrasnleualaasnleulysglyalaleugluleuasntrpthrleu305310315320proglyglnproaspasnthrproproglyglygluleuvalpheglu325330335argtrpargargleuseraspasnserglntrpileglnvalserleu340345350valpheglnthrleuglnglnmetargasplysthrproleuserleu355360365asnthrproproglygluvallysleuthrleualaglycysgluglu370375380argasnalaglnglymetcysserleualaglyphethrglnileval385390395400asnglualaargileproalacysserleu405410<210>10<211>410<212>prt<213>人工序列<400>10glnsergluprogluleulysleugluservalvalilevalserarg151015hisglyvalargalaprothrlysphethrglnleupheglnaspval202530thrproaspalatrpprothrtrpprovallysleuglygluleuthr354045proargglyglygluleuilealatyrleuglyhistyrtrpcysgln505560argleuvalalaaspgluleuleuprolyscysglycysproglnser65707580glyglnvalalaileilealaaspvalaspgluargthrarglysthr859095glyglualaphealaalaglyleualaproaspcysalailethrval100105110hishisglnalaaspthrserserproaspproleupheasnproleu115120125lysthrglyvalcysglnleuaspvalleuasnvalthrargalaile130135140leugluargalaglyglyserilealaaspphethrglyhistyrgln145150155160thralaphearggluleugluargvalleuasnpheproglnserasn165170175leucysleulysargglulysglnaspglusercysserleuthrgln180185190a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