CN112680476A - Klhl22-depdc5蛋白相互作用筛选系统 - Google Patents
Klhl22-depdc5蛋白相互作用筛选系统 Download PDFInfo
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- CN112680476A CN112680476A CN202011534849.9A CN202011534849A CN112680476A CN 112680476 A CN112680476 A CN 112680476A CN 202011534849 A CN202011534849 A CN 202011534849A CN 112680476 A CN112680476 A CN 112680476A
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- plasmid
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- protein
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Abstract
本发明公开了一种KLHL22蛋白和DEPDC5蛋白相互作用筛选系统。该系统包括pHTC‑KLHL22质粒和pNLF1‑N‑DEP质粒;所述pHTC‑KLHL22质粒是将编码KLHL22蛋白的基因插入pHTC质粒的多克隆位点得到的重组质粒;所述pNLF1‑N‑DEP质粒是将编码DEPDC5蛋白DEP结构域的DNA分子插入pNLF1‑N质粒的多克隆位点得到的重组质粒。
Description
技术领域
本发明属于药物筛选领域,具体涉及一种KLHL22-DEPDC5蛋白相互作用筛选系统。
背景技术
目前,在药物筛选领域,已经有多种用于蛋白-蛋白相互作用的检测系统,主要分为基于蛋白的药物筛选系统和基于细胞的药物筛选系统,其中蛋白层面的药物筛选系统包括ALPHA系统,HTRF系统等,其特点为最终检测时为裂解状态或蛋白纯化状态。而另外基于细胞的药物筛选系统即在细胞存活的状态下检测蛋白质的相互作用,主要包括FRET和BRET等技术。
KLHL22是一个重要的E3泛素化连接酶,其底物包括PLK1,DEPDC5和PD-1等,在细胞生长、增殖以及癌症形成方面具有重要调控作用。在此前的报道中,KLHL22通过泛素化DEPDC5激活了mTOR信号通路进而促进三阴性乳腺癌的增殖。基于此,发明人希望能够开发指示DEPDC5-KLHL22相互作用的系统,进而开发三阴性乳腺癌相关的药物。
发明内容
本发明的目的是提供一种KLHL22蛋白和DEPDC5蛋白相互作用筛选系统。
本发明所提供的KLHL22蛋白和DEPDC5蛋白相互作用筛选系统,包括pHTC-KLHL22质粒和pNLF1-N-DEP质粒;
所述pHTC-KLHL22质粒是将编码KLHL22蛋白的基因插入pHTC质粒的多克隆位点得到的重组质粒;
所述pNLF1-N-DEP质粒是将编码DEPDC5蛋白DEP结构域的DNA分子插入pNLF1-N质粒的多克隆位点得到的重组质粒。
进一步的,所述pHTC-KLHL22质粒是将编码KLHL22蛋白的基因插入pHTC质粒的SacII酶切识别位点与XbaI酶切识别位点间,得到的重组质粒;
进一步的,所述pNLF1-N-DEP质粒是将编码DEPDC5蛋白DEP结构域的DNA分子插入pNLF1-N质粒的SacII酶切识别位点与XbaI酶切识别位点间,得到的重组质粒。
其中,所述KLHL22的蛋白氨基酸序列如序列表中序列1所示;所述DEPDC5蛋白DEP结构域的氨基酸序列如序列表中序列2所示;
所述编码KLHL22蛋白的基因的核苷酸序列如序列表中序列3所示;所述编码DEP结构域的DNA分子的核苷酸序列如序列表中序列4所示。
进一步的,所述pHTC-KLHL22质粒和pNLF1-N-DEP质粒的质量配比可为1:(0.001-1),优选为1:(0.001-0.1),更优选为1:(0.001-0.01)。
进一步的,所述筛选系统还包括HEK-293T细胞。
进一步的,所述系统还包括配基和荧光素底物。
本发明还提供上述KLHL22蛋白和DEPDC5蛋白相互作用筛选系统的应用。
本发明所提供的KLHL22蛋白和DEPDC5蛋白相互作用筛选系统的应用是其在制备药物筛选试剂盒中的应用。
所述药物可为预防和/或治疗乳腺癌(如三阴性乳腺癌)相关的药物。
本发明还提供了一种预防和/或治疗乳腺癌相关药物的体外筛选方法。
本发明所提供的预防和/或治疗乳腺癌相关的药物的体外筛选方法,包括下述步骤:
1)将所述筛选系统中的pHTC-KLHL22质粒和pNLF1-N-DEP质粒转染细胞系并表达;
2)向所述转染后的细胞中加入配基,并同时加入待筛选化合物,8小时后再加入荧光素酶底物混合均匀,利用酶标仪对450nm及620nm的生物发光信号进行检测,并将620nm信号/450nm信号*1000作为最终的蛋白相互作用强度。
3)将加入待筛选化合物体系中蛋白相互作用强度与未加入待筛选化合物的体系中的蛋白相互作用强度进行比较,若蛋白相互作用强度下降具有显著性差异(P<0.05),则判定该化合物对乳腺癌癌细胞的增殖具有抑制作用,即该化合物样品具有作为预防和/或治疗乳腺癌相关的药物的潜力;否则不具有作为预防和/或治疗乳腺癌相关的药物的潜力。
其中,所述细胞系为HEK-293T细胞。
所述乳腺癌具体可为三阴性乳腺癌。
为了构建KLHL22-DEPDC5相互作用的模型,发明人曾尝试了ALPHA,NanoBit等系统。发现在原核表达的KLHL22-DEPDC5无法在ALPHA系统下工作。由此推测原核表达的KLHL22及DEPDC5难以进行相互作用。同样,发明人利用了NanoBit系统进行KLHL22-DEPDC5系统的构建,同样无法工作。最终选择了NanoBRET筛选系统,在该系统中,我们选择了KLHL22与DEP结构域的相互作用,其中DEP是DEPDC5与KLHL22相互作用的结构域。
在构建KLHL22-DEP相互作用系统时,发明人将KLHL22和DEP构建到了NanoBRET的pHTC,pHTN,pNLF1-N和pNLF1-C上,由此得到了8个质粒。并且对不同的蛋白N,C端连接进行了测试,最终发现pHTC-KLHL22与pNLF1-N-DEP具有最好的相互作用效果(图2)。除了蛋白不同的连接方式,发明人同样测试了质粒的转染比例,发现当pHTC-KLHL22的质粒量为2ug,pNLF1-N-DEP的质粒量为0.02ug时具有较高的相互作用,该条件更适合用于药物筛选(图3)。除此之外,发明人还在pHTC-KLHL22和pNLF1-N-DEP过表达的同时,过表达了ha-DEP质粒。发现ha-DEP的过表达抑制了KLHL22-DEP的NanoBRET信号,说明本发明的系统真实反映了KLHL22-DEP的相互作用。
附图说明
图1为NanoBRET的方法检测蛋白相互作用原理图;NanoLuc产生460nm荧光,激活618ligand 600nm以上的荧光,600nm/460nm的强度即两个蛋白相互作用强度。
图2为对不同的KLHL22及DEP连接方式进行检测。
图3为对不同转染比例的KLHL-HT,NL-DEP进行相互作用的强度检测;KLHL-HT:NL-DEP:A 1μg+1μg,B 2μg+0.2μg,C 2μg+0.02μg,D 2μg+0.002μg,negative 2μg+0μg;positive 2μg P53-HT+0.2μg NL-MDM2。
图4为在过表达NanoBRET相关质粒的基础上再过表达空载体或ha-DEP,检测NanoBRET系统的信号强度,两者之间有显著性差异,p=0.0062。
图5为化合物1A8对KLHL22-DEP蛋白相互作用的抑制。
图6为化合物1A8对MD A-MB-231的抑制作用。
具体实施方式
下面结合具体实施例对本发明作进一步阐述,但本发明并不限于以下实施例。所述方法如无特别说明均为常规方法。所述原材料如无特别说明均能从公开商业途径获得。
下述实施例中:人类KLHL22(uniprot:Q53GT1),DEP(DEPDC5 DEP结构域)
KLHL-HT代表pHTC-KLHL22;HT-KLHL代表pHTN-KLHL22;
KLHL-NL代表pNLF1-C-KLHL22;NL-KLHL代表pNLF1-N-KLHL22;
DEP-NL代表pNLF1-C-DEP;NL-DEP代表pNLF1-N-DEP;
DEP-HT代表pHTC-DEP;HT-DEP代表pHTN-DEP.
下述实施例采用的方法:nanoBRET(promega,https://www.promega.com.cn/Products/Protein-Interactions/Live-Cell-Protein-Interactions/NanoBRET-PPI-Starter-Systems/)
下述实施例中使用的化合物1A8,其SMILE编码:
OC=1/C=C(/O)C(=CC=1[C@]3([H])NC=2C=CC=CC=2C4=CC(C)=NN34)C(C)(C)C其结构式如式I所示:
化合物1A8购自ChemDiv化合物库,尚无CAS号,ChenDiv化合物库编号为:7210-1961。
实施例1、构建KLHL22-DEPDC5蛋白相互作用筛选系统
实验方法:
首先我们利用传统的质粒构建方法构建了KLHL22及DEP过表达的相关质粒(promega,N1811),具体为将KLHL22和DEP构建到了NanoBRET的pHTC,pHTN,pNLF1-N和pNLF1-C上,由此得到了8个质粒。在获得质粒后,利用PEI试剂(1mg/mL,polysciences,24765)对质粒进行转染。
KLHL22的蛋白氨基酸序列如序列表中序列1所示;DEPDC5蛋白DEP结构域的氨基酸序列如序列表中序列2所示;
编码KLHL22蛋白的基因的核苷酸序列如序列表中序列3所示;所述编码DEP结构域的DNA分子的核苷酸序列如序列表中序列4所示。
在构建上述8个重组质粒时,所采用的酶切位点均为SacII与XbaI。
pCDNA3.1-HA:购自addgene,128034。
pCDNA3.1-HA-DEP:利用传统方法将编码DEP结构域的DNA序列(如序列表中序列4所示)用BamHI和XhoI连接进入到pCDNA3.1-HA质粒中。
首先,将HEK-293T细胞养到了合适的生长状态,并按照30%细胞密度铺到6孔板中。一天后,对0.8-1.2*106个细胞数量进行了质粒转染1ug(KLHL22过表达的相关质粒)+1ug(DEP过表达的相关质粒)。转染后一天,将细胞消化后用计数仪(Thermofisher)计数,并用含有4%血清(Gibco)的Opti-MEM(Gibco)将细胞密度调整为2*106个/mL,并加入NanoBRETTM 618Ligand(1000倍稀释,promega,N1662)。24小时后,给细胞加入25uL荧光素底物(萤光素酶底物)(100倍稀释,promega,N1662),混合均匀后加入到96孔板的孔中。并利用酶标仪(perkin elmer Envision)对450nm及620nm的生物发光信号进行检测。并将620nm信号/450nm信号*1000作为最终的蛋白相互作用强度。结果见图2。由图2可知,相比于其他7组条件,pHTC-KLHL22与pNLF1-N-DEP组(KLHL-HT+NL-DEP)具有最强的生物发光信号。
除了蛋白不同的连接方式,发明人进一步对质粒的转染比例进行了考察。将pHTC-KLHL22与pNFL1-N-DEP组按照A:1μg+1μg,B:2μg+0.2μg,C:2μg+0.02μg,D:2μg+0.002μg,negative 2μg+0μg,或者positive 2μg pHTC-TP53+0.2μg pNLF1-N-MDM2进行转染。首先,将HEK-293T细胞养到了合适的生长状态,并按照30%细胞密度铺到6孔板中。一天后,对细胞按照上述分组进行质粒转染。转染后一天,将细胞消化后用计数仪(Thermofisher)计数,并用含有4%血清(Gibco)的Opti-MEM(Gibco)将细胞密度调整为2*106个/mL,并加入NanoBRETTM 618Ligand(1000倍稀释,promega,N1662)。24小时后,给细胞加入25uL荧光素底物(萤光素酶底物)(100倍稀释,promega,N1662),混合均匀后加入到96孔板的孔中。并利用酶标仪(perkin elmer Envision)对450nm及620nm的生物发光信号进行检测。并将620nm信号/450nm信号*1000作为最终的蛋白相互作用强度。并将A组的强度均一化调整为1,对其他实验组进行相应调整。结果见图3。在A-D四组中,2μg:0.02μg组(C组)以及2μg:0.002μg组(D组)具有较高的相互作用强度,且高于试剂盒给出的阳性对照组(positive)。
在图4中,将pHTC-KLHL22与pNFL1-N-DEP组按照1μg+0.01μg+1ug pCDNA3.1-HA或1μg+0.01μg+1ug pCDNA3.1-HA-DEP进行转染。转染后一天,将细胞消化后用计数仪(Thermofisher)计数,并用含有4%血清(Gibco)的Opti-MEM(Gibco)将细胞密度调整为2*106个/mL,并加入618ligand(1000倍稀释,promega,N1662)。24小时后,给细胞加入25uL荧光素底物(100倍稀释,promega,N1662),混合均匀后加入到96孔板的孔中。并利用酶标仪(perkin elmer)对450nm及620nm的生物发光信号进行检测。并将620nm信号/450nm信号*1000作为最终的蛋白相互作用强度。并将对照(control)的强度均一化调整为1,对其他实验组进行相应调整。图4结果表明,过表达ha-DEP组(o.v.ha-DEP)能够竞争性抑制KLHL22与DEP的相互作用。
实施例2、化合物1A8对KLHL22-DEP蛋白相互作用的抑制
将HEK-293T细胞培养到合适的生长状态,并按照30%细胞密度铺到6孔板中。采用pHTC-KLHL22与pNFL1-N-DEP质粒按照2μg+0.02μg进行转染(1*106个细胞)。转染后一天,将细胞消化后用计数仪(Thermofisher)计数,并用含有4%血清(Gibco)的Opti-MEM(Gibco)将细胞密度调整为2*106个/mL,并加入NanoBRETTM 618Ligand(1000倍稀释,promega,N1662)。16小时后,对细胞加入10μM浓度的化合物1A8化合物(compound)或者DMSO溶剂(ctrl)。8小时后,给细胞加入25uL荧光素底物(萤光素酶底物)(100倍稀释,promega,N1662),混合均匀后加入到96孔板的孔中。并利用酶标仪(perkin elmerEnvision)对450nm及620nm的生物发光信号进行检测。并将620nm信号/450nm信号*1000作为最终的蛋白相互作用强度。并将对照(ctrl)的强度均一化调整为1,对其他实验组进行相应调整。结果见图5。由图5可知,加入化合物组(compound)的细胞中,KLHL22-DEP的相互作用强度要明显低于对照组(ctrl)强度。说明化合物具有抑制KLHL22-DEP相互作用的功能。
实施例3、化合物1A8对三阴性乳腺癌细胞MD A-MB-231的抑制作用
将典型的三阴性乳腺癌细胞MD A-MB-231以每个孔100μL,5000个细胞的数量接种到96孔板中,待细胞贴壁后,每孔加入1uL 10mM(终浓度为100μM)的化合物(compound)或DMSO溶剂(ctrl)。48小时后,对细胞的数量进行计数,加入药物组的细胞数量(compound)远低于对照组(ctrl)数量,说明化合物具有抑制癌细胞生长的作用。
以上对本发明进行了详述。对于本领域技术人员来说,在不脱离本发明的宗旨和范围,以及无需进行不必要的实验情况下,可在等同参数、浓度和条件下,在较宽范围内实施本发明。虽然本发明给出了特殊的实施例,应该理解为,可以对本发明作进一步的改进。总之,按本发明的原理,本申请欲包括任何变更、用途或对本发明的改进,包括脱离了本申请中已公开范围,而用本领域已知的常规技术进行的改变。按以下附带的权利要求的范围,可以进行一些基本特征的应用。
SEQUENCE LISTING
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cttgagacag tgcggtttcc gctgatggaa gctgaggtcc tgcagcggct gcatgacaag 780
ctggacccca gccctttgag ggacacagtg gccagcgccc tcatgtacca ccggaacgag 840
agcctacagc ccagcctgca gagcccgcaa acggagctgc ggtcggactt ccagtgcgtt 900
gtgggcttcg ggggcattca ctccacgccg tccactgtcc tcagcgacca ggccaagtat 960
ctaaacccct tactgggaga gtggaagcac ttcactgcct ccctggcccc ccgcatgtcc 1020
aaccagggca tcgcggtgct caacaacttc gtatacttga ttggagggga caacaatgtc 1080
caaggatttc gagcagagtc ccgatgctgg aggtatgacc cacggcacaa ccgctggttc 1140
cagatccagt ccctgcagca ggagcacgcc gacctgtccg tgtgtgttgt aggcaggtac 1200
atctacgctg tggcgggccg tgactaccac aatgacctga atgctgtgga gcgctacgac 1260
cctgccacca actcctgggc atacgtggcc ccactcaaga gggaggtgta tgcccacgca 1320
ggcgcgacgc tggaggggaa gatgtatatc acctgcggcc gcagagggga ggattacctg 1380
aaagagacac actgctacga tccaggcagc aacacttggc acacactggc tgatgggcct 1440
gtgcggcgcg cctggcacgg catggcaacc ctcctcaaca agctgtatgt gatcgggggc 1500
agcaacaacg atgccggata caggagggac gtgcaccagg tggcctgcta cagctgcacg 1560
tctggacagt ggtcatctgt ctgcccactc cctgctgggc acggtgagcc tggcattgct 1620
gtgctggaca acaggatcta tgtgttaggt ggccgctcac acaaccgcgg cagccgcaca 1680
ggctacgtgc acatttacga tgtggagaag gactgctggg aggaagggcc ccagctggac 1740
aactccatct caggcctggc ggcctgtgtg ctcaccctgc cccgctccct gctccttgag 1800
ccgccccgcg ggacccctga ccgcagccag gccgacccgg actttgcctc tgaggtgatg 1860
agtgtgtctg actgggagga gtttgacaac tccagtgagg actag 1905
<210> 4
<211> 225
<212> DNA
<213> Artificial sequence
<400> 4
tcgacaggag tccagctgct ctctgaacag aagggcctct caccgtactg cttcatcagc 60
gcggaggtgg tacactggtt ggtgaaccac gtggagggga tccagacaca ggcgatggcc 120
attgacatca tgcagaaaat gctggaagag cagctcatca cacatgcatc tggcgaagcc 180
tggcggacct tcatctacgg cttctatttc tacaagatag taacg 225
Claims (10)
1.一种KLHL22蛋白和DEPDC5蛋白相互作用筛选系统,包括pHTC-KLHL22质粒和pNLF1-N-DEP质粒;
所述pHTC-KLHL22质粒是将编码KLHL22蛋白的基因插入pHTC质粒的多克隆位点得到的重组质粒;
所述pNLF1-N-DEP质粒是将编码DEPDC5蛋白DEP结构域的DNA分子插入pNLF1-N质粒的多克隆位点得到的重组质粒。
2.如权利要求1所述的系统,其特征在于:所述KLHL22的蛋白氨基酸序列如序列表中序列1所示;所述DEPDC5蛋白DEP结构域的氨基酸序列如序列表中序列2所示。
3.如权利要求2所述的系统,其特征在于:所述编码KLHL22蛋白的基因的核苷酸序列如序列表中序列3所示;所述编码DEP结构域的DNA分子的核苷酸序列如序列表中序列4所示。
4.如权利要求1至3中任一所述的系统,其特征在于:所述pHTC-KLHL22质粒和pNLF1-N-DEP质粒的质量配比为1:(0.001-1),优选为1:(0.001-0.1),更优选为1:(0.001-0.01)。
5.如权利要求4所述的系统,其特征在于:所述pHTC-KLHL22质粒和pNLF1-N-DEP质粒的质量配比为1:0.01或1:0.001。
6.如权利要求1至5中任一所述的系统,其特征在于:所述系统还包括HEK-293T细胞。
7.如权利要求1至6中任一所述的系统,其特征在于:所述系统还包括配基和荧光素底物。
9.权利要求1-8中任一项所述的系统在制备药物筛选试剂盒中的应用。
10.根据权利要求9所述的应用,其特征在于:所述药物为预防和/或治疗三阴性乳腺癌相关的药物。
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