CN114671943B - 一种鱼类摄食调控蛋白的制备和应用 - Google Patents
一种鱼类摄食调控蛋白的制备和应用 Download PDFInfo
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Abstract
本发明公开了一种鱼类摄食调控蛋白的制备,涉及基因工程技术领域,包括如下步骤:S1、罗非鱼肝脏总RNA的提取;S2、罗非鱼angptl8基因cDNA全序列的克隆;S3、罗非鱼angptl8的组织表达分布;S4、罗非鱼angptl8在进食过程的表达变化;S5、angptl8重组蛋白制备;S6、采用腹腔注射研究angptl8重组蛋白对罗非鱼摄食的影响。本发明鱼类angptl8基因在鱼类肝脏中大量表达,该基因产生的成熟蛋白具有调节鱼类摄食的功能,可以通过生物合成的方法进行开发利用,使用方便,效果显著,具有广泛的应用价值。本方案中采用原核表达制备重组蛋白,具有产量高,成本低,操作方便,易重复等优点。
Description
技术领域
本发明属于基因工程技术领域,具体涉及一种鱼类摄食调控蛋白的制备和应用。
背景技术
现有诱食剂活性低,用量大,生产成本较高并且有一定的毒副作用。本发明的目的在于提供一种血管生成素样8基因编码成熟蛋白。本发明另一目的在于提供上述鱼类angptl8神经蛋白基因的应用。
发明内容
本发明的目的是针对现有的问题,提供了一种鱼类摄食调控蛋白的制备和应用。
本发明是通过以下技术方案实现的:
一种鱼类摄食调控蛋白的制备,包括如下步骤:
S1、罗非鱼肝脏总RNA的提取:
取一条健康罗非鱼,解剖后分离肝脏组织,采用Trizol试剂法获得罗非鱼肝脏总RNA;
S2、罗非鱼angptl8基因cDNA全序列的克隆:
S201、以合成的第一链cDNA作为模板,设计特异性引物AN-F1、AN-R1,进行PCR扩增;
S202、将所得PCR产物上样至1.5%琼脂糖凝胶,以低电压电泳分离DNA片段,从凝胶中纯化回收目的产物;
S204、根据已得到的cDNA片段序列设计特异性引物,利用cDNA末端快速扩增技术对目的基因的3'末端和5'末端进行PCR扩增;
S205、按照RACE试剂盒GeneRacerTM Kit说明书对罗非鱼肝脏总RNA进行去磷酸,去mRNA5'帽子结构,与RNAOligo连接,最终通过反转录合成cDNA第一链;
S206、以罗非鱼angptl8cDNA的3'-RACE、5'-RACE特异引物AN-F2、AN-F3和AN-R2、AN-R3,和GeneRacerTM Kit的通用引物扩增罗非鱼angptl8cDNA 5'端片段和3'端片段;
S207、对所得到的PCR产物的回收纯化后,连接T载体、转化DH5α感受态,利用蓝白斑筛选阳性菌落,菌落PCR验证后进行DNA测序;
S3、罗非鱼angptl8的组织表达分布:
利用实时荧光定量PCR技术检测罗非鱼angptl8在各种组织中的表达;
S301、提取罗非鱼下丘脑、端脑、视顶盖、小脑、嗅球、延髓、脊髓、垂体、肝脏、脂肪、肠、肌肉等12个组织总RNA;
S302、经DNaseI处理后,按照iScriptTM说明书取1μg RNA进行反转录;
S304、通过分析qPCR溶解曲线,确定扩增产物特异性;
S4、罗非鱼angptl8在进食过程的表达变化:
S401、将体重2±0.5g的罗非鱼随机分配到四个玻璃缸中,分别为对照组和3个投喂组,平均每个缸6条罗非鱼;
S402、每天下午4点投喂1次,食物投喂量为体重的3%,驯养两周后,实验正式开始;
S403、按照下列时间点对正常喂养下罗非鱼的下丘脑取样:摄食前1h、摄食中(0hr)、摄食后1hr和摄食后3hr;
S404、罗非鱼用0.05%MS-222麻醉后处死收集下丘脑样品,液氮速冻处理,存放于-80℃超低温冰箱备用;
S405、通过qPCR技术检测罗非鱼下丘脑中angptl8基因表达量变化;
S5、angptl8重组蛋白制备:
S501、以罗非鱼肝脏组织cDNA为模板,通过Taq酶试剂盒扩增angptll8cDNA序列全长;
S502、使用1.5%琼脂糖凝胶对扩增后的产物进行电泳,并用胶回收试剂盒进行目的片段回收;
S503、将纯化片段双酶切后连接pET30a(+)表达载体,并转化BL21(DE3)感受态细胞;
S504、利用LB培养基(Kana抗生素:50mg/ml)筛选阳性表达菌落,菌液PCR验证后保种;
S505、按照1%LB培养基(Kana抗生素:50mg/ml)体积加入angptl8-pET30a(+)-BL21(DE3)菌液,37℃,200rpm摇床过夜后,将菌液倒入100倍体积的LB培养基(Kana抗生素:50mg/ml)中,37℃,200rpm培养至菌液浓度OD600≈0.5(约3hr),加入IPTG至终浓度为0.1mM,37℃,200rpm诱导表达6hr;
S506、菌液5000×g离心2min后弃上清,并用裂解液润洗2次;
S507、按照菌液体积10%加入裂解液,冰浴超声破碎;
S508、破碎液通过10,000×g4℃离心30min,使用0.45μm过滤器过滤上清液;
S509、利用His标签蛋白纯化试剂盒(碧云天生物技术公司)纯化蛋白,洗脱条件为:50mM咪唑和100mM咪唑裂解液清洗杂蛋白,500mM咪唑裂解液洗脱目的蛋白;
S5011、利用3K超滤管(Milipore)浓缩洗脱液,BCA法测目的蛋白终浓度;
S6、采用腹腔注射研究angptl8重组蛋白对罗非鱼摄食的影响:
S601、将体重2±0.5g的罗非鱼随机分配到2个玻璃缸中,平均每个缸6条罗非鱼;
S602、罗非鱼每天下午4点投喂一次,食物投喂量为体重的3%,驯养两周后开始正式实验;
S603、罗非鱼用MS-222麻醉后,称量每组中个体体重(body weight,BW),根据体重分别由腹腔注射0.7%鱼类生理盐水(对照组)、1μg/g BW angptl8;
S604、注射10分钟后,分别向每组罗非鱼投喂固定重量的食物,让每组罗非鱼自由摄食2小时;
S605、将各组剩余的食物分别收集并烘干,根据剩余的食物的重量计算各组中单位体重罗非鱼的摄食量。
进一步地,步骤S303中所述的qPCR所涉及的具体反应程序如下:95℃预变性2min,然后95℃变性30s,60℃退火30s,72℃延伸30s,共进行40个循环。
进一步地,步骤S303中qPCR反应时每个样品设置三个平行。
进一步地,步骤S507中所述的超声条件:6mm探头,40%功率,工作4s,休息9s,工作时间10min。
进一步地,所述的各特异引物AN-F1、AN-F2、AN-F3、AN-R1、AN-R2、AN-R3分别命名为:SEQ ID NO:1、SEQ ID NO:2、SEQ ID NO:3、SEQ ID NO:4、SEQ ID NO:5、SEQ ID NO:6,其序列分别为:
SEQ ID NO:1 5’to3’atgatctggagcctgtgcttgc;
SEQ ID NO:2 5’to3’gcaagcacaggctccagatcat;
SEQ ID NO:3 5’to3’tgccaccttgtattccgtcttgctgg;
SEQ ID NO:4 5’to3’ttacatatttccatgtcttctta;
SEQ ID NO:5 5’to3’caggtaagaagacatggaaata;
SEQ ID NO:6 5’to3’cactgagagaactctccaaaagctga。
本发明相比现有技术具有以下优点:
1、本发明鱼类angptl8基因在鱼类肝脏中大量表达,该基因产生的成熟蛋白具有调节鱼类摄食的功能,可以通过生物合成的方法进行开发利用,使用方便,效果显著,具有广泛的应用价值。本方案中采用原核表达制备重组蛋白,具有产量高,成本低,操作方便,易重复等优点。
2、本发明基于罗非鱼的理论研究,鉴定了鱼类血管生成素样8基因编码的成熟蛋白angptl8具有调节鱼类摄食的功能。这为开发出高活性、无毒和成本低廉的诱食剂,作为饲料添加剂,促进养殖鱼类等的发展具有广泛的应用价值。
附图说明
图1为本发明鱼类angptl8基因在各个组织的表达分析;
图2为本发明鱼类angptl8基因在进食过程的表达变化;
图3为本发明鱼类angptl8重组蛋白纯化图;
图4为本发明鱼类angptl8腹腔注射对罗非鱼摄食的影响;
具体实施方式
为了对本发明做更进一步的解释,下面结合附图和具体实施例进行阐述。
一种鱼类摄食调控蛋白的制备,包括如下步骤:
S1、罗非鱼肝脏总RNA的提取:
取一条健康罗非鱼,解剖后分离肝脏组织,采用Trizol试剂法获得罗非鱼肝脏总RNA,其OD260/280=1.95,OD260/230=2.0。电泳结果显示,28S rRNA,18S rRNA条带清晰,28S条带亮度为18S的两倍,表明所得总RNA未被蛋白质、酚和基因组DNA污染,纯度高;
S2、罗非鱼angptl8基因cDNA全序列的克隆:
S201、以合成的第一链cDNA作为模板,设计特异性引物AN-F1(5'atgatctggagcctgtgcttgc 3')、AN-R1(ttacatatttccatgtcttctta 3'),进行PCR扩增;
S202、将所得PCR产物上样至1.5%琼脂糖凝胶,以低电压电泳分离DNA片段,从凝胶中纯化回收目的产物;
S204、根据已得到的cDNA片段序列设计特异性引物,利用cDNA末端快速扩增技术对目的基因的3'末端和5'末端进行PCR扩增;
S205、按照RACE试剂盒GeneRacerTM Kit说明书对罗非鱼肝脏总RNA进行去磷酸,去mRNA 5'帽子结构,与RNA Oligo连接,最终通过反转录合成cDNA第一链;
S206、以罗非鱼angptl8cDNA的3'-RACE、5'-RACE特异引物AN-F2(5'gcaagcacaggctccagatcat 3')、AN-F3(5'tgccaccttgtattccgtcttgctgg 3')和AN-R2(5'caggtaagaagacatggaaata 3')、AN-R3(5'cactgagagaactctccaaaagctga 3'),和GeneRacerTM Kit的通用引物扩增罗非鱼angptl8cDNA5'端片段和3'端片段;
S207、对所得到的PCR产物的回收纯化后,连接T载体、转化DH5α感受态,利用蓝白斑筛选阳性菌落,菌落PCR验证后进行DNA测序,通过分子克隆技术,在罗非鱼中克隆得到angptl8cDNA序列1059bp,其中开放阅读框(ORF)序列321bp,编码的angptl8蛋白为106个氨基酸,蛋白前体等电点为9.37,分子量为12.04千道尔顿,其中N-端信号蛋白由22个氨基酸组成(核酸序列表);
S3、罗非鱼angptl8的组织表达分布:
利用实时荧光定量PCR技术检测罗非鱼angptl8在各种组织中的表达;
S301、提取罗非鱼下丘脑、端脑、视顶盖、小脑、嗅球、延髓、脊髓、垂体、肝脏、脂肪、肠、肌肉等12个组织总RNA;
S302、经DNaseI处理后,按照iScriptTM说明书取1μg RNA进行反转录;
S303、将反转录产物稀释10倍作为cDNA模板,参照iQTM GreenSupermix说明书准备qPCR反应体系,qPCR所涉及的具体反应程序如下:95℃预变性2min,然后95℃变性30s,60℃退火30s,72℃延伸30s,共进行40个循环;
S304、通过分析qPCR溶解曲线,确定扩增产物特异性;
为保证结果的可信性,进行qPCR反应时每个样品设置三个平行;
采用实时荧光定量PCR检测罗非鱼angptl8基因在各种组织中的表达,结果显示在肝脏和肌肉中表达丰度最高;在其他组织表达量较低。显示出angptl8具有明显的组织表达特异性(图1);
S4、罗非鱼angptl8在进食过程的表达变化:
S401、将体重2±0.5g的罗非鱼随机分配到四个玻璃缸中,分别为对照组和3个投喂组,平均每个缸6条罗非鱼;
S402、每天下午4点投喂1次,食物投喂量为体重的3%,驯养两周后,实验正式开始;
S403、按照下列时间点对正常喂养下罗非鱼的下丘脑取样:摄食前1h、摄食中(0hr)、摄食后1hr和摄食后3hr;
S404、罗非鱼用0.05%MS-222麻醉后处死收集下丘脑样品,液氮速冻处理,存放于-80℃超低温冰箱备用;
S405、通过qPCR技术检测罗非鱼下丘脑中angptl8基因表达量变化;
用实时荧光定量PCR检测罗非鱼基因在进食状态下的变化,结果表明:下丘脑angptl8mRNA表达水平在进食1小时后被显著抑制,表明angptl8与摄食调控相关(图2);
S5、angptl8重组蛋白制备:
S501、以罗非鱼肝脏组织cDNA为模板,通过Taq酶试剂盒扩增angptll8cDNA序列全长;
S502、使用1.5%琼脂糖凝胶对扩增后的产物进行电泳,并用胶回收试剂盒进行目的片段回收;
S503、将纯化片段双酶切后连接pET30a(+)表达载体,并转化BL21(DE3)感受态细胞;
S504、利用LB培养基(Kana抗生素:50mg/ml)筛选阳性表达菌落,菌液PCR验证后保种;
S505、按照1%LB培养基(Kana抗生素:50mg/ml)体积加入angptl8-pET30a(+)-BL21(DE3)菌液,37℃,200rpm摇床过夜后,将菌液倒入100倍体积的LB培养基(Kana抗生素:50mg/ml)中,37℃,200rpm培养至菌液浓度OD600≈0.5(约3hr),加入IPTG至终浓度为0.1mM,37℃,200rpm诱导表达6hr;
S506、菌液5000×g离心2min后弃上清,并用裂解液润洗2次;
S507、按照菌液体积10%加入裂解液,冰浴超声破碎,超声条件:6mm探头,40%功率,工作4s,休息9s,工作时间10min;
S508、破碎液通过10,000×g4℃离心30min,使用0.45μm过滤器过滤上清液;
S509、利用His标签蛋白纯化试剂盒(碧云天生物技术公司)纯化蛋白,洗脱条件为:50mM咪唑和100mM咪唑裂解液清洗杂蛋白,500mM咪唑裂解液洗脱目的蛋白;
S5011、利用3K超滤管(Milipore)浓缩洗脱液,BCA法测目的蛋白终浓度为1.2g/L(图3);
通过体外重组蛋白angptl8原核表达后大量纯化获得活性蛋白(图3);
S6、采用腹腔注射研究angptl8重组蛋白对罗非鱼摄食的影响:
S601、将体重2±0.5g的罗非鱼随机分配到2个玻璃缸中,平均每个缸6条罗非鱼;
S602、罗非鱼每天下午4点投喂一次,食物投喂量为体重的3%,驯养两周后开始正式实验;
S603、罗非鱼用MS-222麻醉后,称量每组中个体体重(body weight,BW),根据体重分别由腹腔注射0.7%鱼类生理盐水(对照组)、1μg/g BW angptl8;
S604、注射10分钟后,分别向每组罗非鱼投喂固定重量的食物,让每组罗非鱼自由摄食2小时;
S605、将各组剩余的食物分别收集并烘干,根据剩余的食物的重量计算各组中单位体重罗非鱼的摄食量;
采用腹腔注射化学原核表达的angptl8成熟蛋白,实际应用表明,angptl8能够显著性增加罗非鱼的摄食量(图4)。
因此,本发明鱼类angptl8基因编码的成熟蛋白angptl8可以用于诱导鱼类摄食。
序列表
<110> 四川大学
<120> 一种鱼类摄食调控肽的制备和应用
<160> 7
<170> SIPOSequenceListing 1.0
<210> 1
<211> 22
<212> DNA
<213> 人工序列(Artificial Sequence)
<400> 1
atgatctgga gcctgtgctt gc 22
<210> 2
<211> 22
<212> DNA
<213> 人工序列(Artificial Sequence)
<400> 2
gcaagcacag gctccagatc at 22
<210> 3
<211> 26
<212> DNA
<213> 人工序列(Artificial Sequence)
<400> 3
tgccaccttg tattccgtct tgctgg 26
<210> 4
<211> 23
<212> DNA
<213> 人工序列(Artificial Sequence)
<400> 4
ttacatattt ccatgtcttc tta 23
<210> 5
<211> 22
<212> DNA
<213> 人工序列(Artificial Sequence)
<400> 5
caggtaagaa gacatggaaa ta 22
<210> 6
<211> 26
<212> DNA
<213> 人工序列(Artificial Sequence)
<400> 6
cactgagaga actctccaaa agctga 26
<210> 7
<211> 1059
<212> DNA
<213> 人工序列(Artificial Sequence)
<400> 7
gctgaggggc tgatgacact gctatgacag acaagtgcct gtttatggct ttcatttttg 60
tctcatacat aaaaaaaaag ctttattttg cacaggcgct attgctgaaa gataaatcag 120
aaatatcttt tgaacatttg aaagaactga ggaaacaaca tttattatcg caatgatctg 180
gagcctgtgc ttgctttttg tggctggagc agtgcacgca agcccggtca ggaagaccag 240
caagacggaa tacaaggtgg caccgcaaga agaagtcaat gtgctcatgt ttggtgtctt 300
acagtttggc gaatccctaa actatgctta tgaaaccact gaggcaaaga tagcgagaat 360
cagccggtct ttgaagaaca ctgagagaac tctccaaaag ctggggaaac agactgagca 420
ggctgcagag gtggagaaac agatcaaaga agtgatacag ctgctacagg taagaagaca 480
tggaaatatg taaagaccac aaagactaaa gaatggctga ccagcctgga gaaggaagag 540
caggagctga ggacaaaagt gaaccggttg gagatgcacc tcagcaactc tgtacctcca 600
agcatcaagg agctgcagga gagagcagag gagcacgaca aagtcttgcg aggcttacag 660
cttttgactc agttccaaaa agaggatatt gagagtcaga atgagcagct tgccaaactg 720
cagaagatga gtgaagtgct gacatgatcc agatctcaac tccataaact cactgcactc 780
ccttccaacc ttgctatgga tgctatagat caactgtact ggcagaaaat atatattttg 840
ggtccttcat aattacatcc ttgttattgt gcctgtaatt tatattttgt gcattgtttt 900
tgtgtcttta catcagtttg ctttgtaaat ttgcttttta aaataagctg ttaaattatt 960
aaagattgtg tttggtgaac tagtattata tgtacacgct gtacatagaa taaaaacaat 1020
ttgtttgttt tttgtaaaaa aaaaaaaaaa aaaaaaaaa 1059
Claims (2)
1.一种鱼类摄食调控蛋白的制备方法,其特征在于,包括如下步骤:
(1)以罗非鱼肝脏组织cDNA 为模板,通过 Taq 酶试剂盒扩增 angptll8 cDNA 序列全长,其中,angptl8cDNA 序列如序列 7 所示;
(2) 使用 1.5%琼脂糖凝胶对扩增后的产物进行电泳,并用胶回收试剂盒进 行目的片段回收;
(3) 将纯化片段双酶切后连接 pET30a(+)表达载体,并转化 BL21(DE3) 感受态细胞;
(4) 利用LB 培养基筛选阳性表达菌落,菌液 PCR 验证后保种;
(5)按照 1% LB 培养基体积加入 angptl8-pET30a(+)-BL21(DE3)菌液,37℃, 200rpm摇床过夜后,将菌液倒入 100 倍体积的 LB 培养基中,37℃ ,200rpm 培 养至菌液浓度OD600≈0.5 ,加入 IPTG 至终浓度为 0. 1mM ,37℃ ,200rpm 诱导 表达 6hr;
(6) 菌液 5000×g 离心 2min 后弃上清,并用裂解液润洗 2 次;
(7) 按照菌液体积 10%加入裂解液,冰浴超声破碎;
(8) 破碎液通过 10,000×g4℃离心 30min,使用 0.45μm 过滤器过滤上清液;
(9) 利用 His 标签蛋白纯化试剂盒纯化蛋白,洗脱条件为:50mM 咪唑和 100mM 咪唑裂解液清洗杂蛋白,500mM 咪唑裂解液洗脱目的蛋白;
(10) 利用3K 超滤管浓缩洗脱液,BCA 法测目的蛋白终浓度。
2.根据权利要求 1 所述一种鱼类摄食调控蛋白的制备方法,其特征在于, 步骤 (7)中所述的超声条件:6mm 探头,40%功率,工作 4s ,休息 9s ,工作时 间 10min。
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