鄭慧玲 崔紅晶 余磊等
[摘要]目的 構(gòu)建人kin17基因真核表達(dá)載體pEGFP-N1-kin17,將載體轉(zhuǎn)染至野生型及Zmpste24基因缺失的小鼠胚胎成纖維上皮細(xì)胞,熒光顯微鏡觀察kin17蛋白表達(dá)情況。 方法 用高保真DNA 聚合酶,從pCMV-kin17載體中擴(kuò)增獲取人kin17 cDNA編碼序列,將其克隆至pEGFP-N1載體中,經(jīng)酶切、連接、轉(zhuǎn)化后,挑取陽(yáng)性克隆進(jìn)行菌液進(jìn)行PCR、菌液質(zhì)粒雙酶切及測(cè)序鑒定;將成功構(gòu)建的GFP-kin17表達(dá)載體轉(zhuǎn)染Zmpste24-/- MEFs,熒光顯微鏡觀察kin17蛋白的核定位情況。 結(jié)果 pEGFP-N1-kin17轉(zhuǎn)化細(xì)菌克隆測(cè)序結(jié)果完全正確;將載體轉(zhuǎn)入MEFs后,可以通過(guò)熒光顯微鏡觀察到kin17蛋白的表達(dá)。 結(jié)論 成功構(gòu)建GFP融合的kin17真核表達(dá)載體,該載體為kin17蛋白的研究提供工具。本實(shí)驗(yàn)中載體pEGFP-N1-kin17在野生型和Zmpste24-/- MEFs中均成功表達(dá)。
[關(guān)鍵詞] kin17;GFP;Zmpste24;小鼠胚胎成纖維細(xì)胞
[中圖分類(lèi)號(hào)] R346 [文獻(xiàn)標(biāo)識(shí)碼] A [文章編號(hào)] 2095-0616(2014)13-34-05
[Abstract] Objective To construct the kin17 GFP fusion eukaryotic expression vector and explore the expression and location of kin17 in Zmpste24-/- mouse embryonic fibroblasts (MEFs). Methods cDNA fragment of kin17 was amplified from pCMV-kin17 by PCR and cloned into GFP fusion eukaryotic expression vector pEGFP-N1. The positive clone was confirmed by sequencing. Zmpste24-/- and wild type MEFs were obtained from 13.5 d pregnant Zmpste24+/- female mouse. The recombinant plasmid was transiently transfected into Zmpste24-/- MEFs with LipofectamineTM2000. The protein expression of kin17 was detected by fluorescence microscopy. Results Eukaryotic expression vector pEGFP-N1-kin17 containing coding region of human kin17 gene was successfully constructed. Zmpste24-/- and wild type MEFs were identified by PCR and western blotting genotyping. Zmpste24-/- and wild type MEFs transfected with the recombinant plasmid expressed high level of recombinant kin17 protein was detected by fluorescence microscopy. Conclusion The construction of pEGFP-N1-kin17 was successfully achieved and the expression of GFP-kin17 was located in the nucleus of Zmpste24-/- and wild type MEFs.
[Key words] kin17; GFP; Zmpste24; Mouse embryonic fibroblasts
Kin17(from immunological kinship to Rec A Protein,clone17)蛋白是一種普遍表達(dá)的核蛋白,從酵母到人均可檢測(cè)到kin17蛋白的表達(dá)。Kin17蛋白與DNA直接結(jié)合,參與DNA合成;同時(shí)kin17也具有和RNA直接結(jié)合的結(jié)構(gòu),類(lèi)SH3(src homology 3)的結(jié)構(gòu)域,因此kin7可能是細(xì)胞核內(nèi)功能調(diào)節(jié)的重要蛋白質(zhì)。Kin17在細(xì)胞增殖期表達(dá)量最高[1-4]。在DNA損傷因素處理后,kin17蛋白的表達(dá)量明顯上調(diào),提示kin17蛋白可能參與DNA損傷修復(fù),因此它被稱(chēng)為應(yīng)激蛋白[5]。本研究小組前期通過(guò)酵母雙雜交方法,以lamin A為誘餌蛋白,從人骨骼肌文庫(kù)中釣取相互作用蛋白。Kin17為其中之一的陽(yáng)性克隆。通過(guò)內(nèi)源性免疫共沉淀,我們?cè)俅悟?yàn)證了kin17和lamin A是相互作用蛋白。 Zmpste24 [Zinc Metallopeptidase(STE24 Homolog,Yeast)],是lamin A蛋白成熟過(guò)程中必須的基質(zhì)金屬蛋白酶。Zmpste24敲除(Zmpste24-/-)模型小鼠因不能順利剪切l(wèi)amin A前體prelamin A蛋白,造成體內(nèi)大量prelamin A堆積,導(dǎo)致小鼠產(chǎn)生許多以早老表型為主的病理特征。在Zmpste24-/-細(xì)胞水平,則觀察到細(xì)胞核異常、基因組不穩(wěn)定性等病理現(xiàn)象[6-8]。本實(shí)驗(yàn)構(gòu)建pEGFP-N1-kin17,并將載體轉(zhuǎn)染Zmpste24-/-小鼠胚胎成纖維細(xì)胞(mouse embryonic fibroblasts, MEFs),為進(jìn)一步深入探討kin17和lamin A的相互關(guān)系建立了一個(gè)有效的細(xì)胞實(shí)驗(yàn)?zāi)P?。endprint
1 材料與方法
1.1 MEFs分離和傳代
孕13.5 Zmpste24+/-雌小鼠由香港大學(xué)周中軍教授饋贈(zèng)。實(shí)施斷頸法處死孕小鼠,無(wú)菌條件下取出小鼠胚囊,逐一分離,置于3.5cm的培養(yǎng)皿中。除去胚胎頭部及內(nèi)臟組織后(收取部分做基因型鑒定),每個(gè)胚胎加入1mL胰蛋白酶-EDTA后用眼科剪將組織剪碎,并在37℃孵育約15min。隨后將細(xì)胞組織懸液轉(zhuǎn)移至一個(gè)15cm培養(yǎng)皿中,加入20mL含10%胎牛血清的DMEM培養(yǎng)液,終止胰酶消化,在培養(yǎng)箱中過(guò)夜培養(yǎng),次日更換培養(yǎng)基。細(xì)胞長(zhǎng)到80%~90%匯合時(shí)并仍處于指數(shù)生長(zhǎng)期時(shí),凍存細(xì)胞或?qū)⒓?xì)胞傳代。傳代時(shí)棄去培養(yǎng)液,PBS緩沖液清洗細(xì)胞,1mL 5%胰酶-EDTA 37℃消化5min。隨后加入上述DMEM培養(yǎng)液5mL,輕輕吹打細(xì)胞,使細(xì)胞脫離培養(yǎng)皿表面,離心回收細(xì)胞后,可根據(jù)實(shí)驗(yàn)將細(xì)胞1︰3至1︰5稀釋移至新的培養(yǎng)皿中,或用血球計(jì)數(shù)板計(jì)數(shù),接種相應(yīng)的細(xì)胞數(shù)量至實(shí)驗(yàn)所需的不同的細(xì)胞培養(yǎng)皿中,加入適量培養(yǎng)液在37℃ 5%CO2培養(yǎng)箱培養(yǎng)。
1.2 MEFs基因型鑒定
1.2.1 基因水平鑒定方法 PBND法[50mM KCl,10mM Tris-HCL(pH8.3), 2.5mM MgCl2, 0.1mg/mL gelatin, 0.45%(v/v) Nonident P40,0.45%(v/v) Tween 20]溶解收取的部分小鼠胚胎組織,加入蛋白酶K(20mg/mL),55℃過(guò)夜。次日沸水煮樣本5min,離心取上清1~5?L作為PCR模板。PCR引物:共同上游引物GTCTCCTCGTGATGTCACAACTTTG,野生型下游引物GGAGCGGATCTCAAA CTCTCCTC,突變型下游GAATCCAAACATGACCTTCCCCT。反應(yīng)條件按照Taq DNA Polymerase(Takara)說(shuō)明書(shū)進(jìn)行,具體為:94℃ 10s,60℃15s,72℃ 30s,30 Cycles。
1.2.2 蛋白水平鑒定方法 1.1培養(yǎng)的MEFs中取部分細(xì)胞,胰酶消化收集細(xì)胞,1×PBS清洗細(xì)胞,離心回收細(xì)胞后加入含蛋白酶抑制劑(Merck)的RAPI 裂解緩沖液(0.5% Nonidet P-40,150 mM NaCl,100mM DTT and 50 mM Tris-HCl,pH 8.0)在冰上裂解細(xì)胞。細(xì)胞裂解液加入蛋白上樣緩沖液后在沸水中加熱樣品3min使蛋白變性。制備SDS-PAGE膠,每孔上樣10μL進(jìn)行電泳分離蛋白,將凝膠上的蛋白電轉(zhuǎn)移至PVDF膜(Millipore),5%脫脂牛奶封閉劑,室溫孵育1h;加入1︰5 000稀釋的laminA/C (H-110)多克隆抗體(Santa Cruz)室溫孵育2h;加入1︰5 000稀釋的HRP二抗(Bethyl),室溫孵育1h。最后加入ECL發(fā)光試劑于PVDF膜上,用X光片曝光及顯影定影,獲得結(jié)果。
1.3 人Kin17原核表達(dá)載體的構(gòu)建和鑒定
引物設(shè)計(jì)與PCR:擴(kuò)增人kin17 cDNA序列上游引物:上游 CGCGGATCCATGGGGAAGTCGGATT,酶切位點(diǎn)為BamHI;下游 CCGCTCGAGTCAGGCAAGTTTAG AAATG,酶切位點(diǎn)為XhoI。由上海生工合成。以法國(guó) Angulo F.教授饋贈(zèng)pCMV-kin17質(zhì)粒為模板。反應(yīng)條件按照PrimerSTARTM HS DNA Polymerase(Takara)說(shuō)明書(shū)進(jìn)行,具體為:98℃ 10s,55℃ 15s,72℃ 1min,30 Cycles。按PCR片段純化試劑盒(上海生工)說(shuō)明書(shū)將PCR擴(kuò)增片段進(jìn)行純化,取純化的Kin17 PCR擴(kuò)增產(chǎn)物和pEGFP-N1質(zhì)粒DNA進(jìn)行BamHI和XhoI限制性?xún)?nèi)切酶酶切反應(yīng)。再次純化酶切產(chǎn)物,利用T4 DNA連接酶進(jìn)行DNA連接,16℃反應(yīng)16h。將連接產(chǎn)物的轉(zhuǎn)化入感受態(tài)大腸桿菌DH10B。含氨芐青霉素(50mg/mL)的LB瓊脂平板上涂布菌液,37℃倒置培養(yǎng)12~16h,觀察到單菌落形成。挑取小部分菌落作為模板,再次進(jìn)行相同PCR,將PCR反應(yīng)電泳確證后的重組子克隆寄到上海生工測(cè)序。
1.4 質(zhì)粒轉(zhuǎn)染MEFs
將18mm×18mm無(wú)菌蓋玻片置于6孔板中,接種1×106 MEFs細(xì)胞在蓋玻片上,過(guò)夜培養(yǎng),次日轉(zhuǎn)染pEGFP-N1-kin17入MEFs。轉(zhuǎn)染試劑為L(zhǎng)ipofectamine2000(Life),參考試劑說(shuō)明書(shū)進(jìn)行操作。配制A液:500?L OPTI Medium(Life)加入4?g質(zhì)粒,B液為500?L OPTI Medium加入10?L Lipofatemine 2000。指尖輕彈管壁混勻,室溫靜置 5min。將 A 液和B液 相加并混勻,室溫靜置20min后,使用移液器輕輕滴加到培養(yǎng)MEFs的6孔板中,輕輕搖動(dòng) 6孔板,混勻轉(zhuǎn)染混合液,將6孔板放回培養(yǎng)箱。轉(zhuǎn)染4~6h后更換新鮮培養(yǎng)基。
1.5 熒光顯微鏡觀察GFP-Kin17表達(dá)情況
轉(zhuǎn)染24h后PBS緩沖液洗MEFs 2次,4%PFA固定細(xì)胞10min,PBS緩沖液洗Hela細(xì)胞3次,10min/次。每個(gè)蓋玻片的細(xì)胞加約10?L SlowFade? Gold antifade reagent with DAPI 的封片劑,小心將蓋玻片放在載玻片上,四周封上少許透明指甲油。待樣品風(fēng)干片刻,即可進(jìn)行熒光顯微鏡觀測(cè)。也可將玻片暫存于-20℃或-80℃冰箱,觀測(cè)前取出即可。
2 結(jié)果
2.1 pEGFP-N1-kin17質(zhì)粒的構(gòu)建
pEGFP-N1載體全長(zhǎng)為4700bp,人kin17全長(zhǎng)為1182bp。人kin17的PCR產(chǎn)物兩端分別加上酶切位點(diǎn)和保護(hù)堿基,長(zhǎng)度為1200bp。1%的瓊脂糖電泳可以看到pEGFP-N1-kin17 BamHI /XhoI雙酶切后的小片段DNA與PCR的DNA片段大小相同與預(yù)期片段大小一致,而pEGFP-N1-kin17單酶切的載體比單酶切空載體pEGFP-N1片段略長(zhǎng),同樣與預(yù)期片段一致。因此,瓊脂糖凝膠電泳證實(shí)pEGFP-N1-kin17成功構(gòu)建,見(jiàn)圖1A。挑取經(jīng)BamHI/XhoI雙酶切反應(yīng),凝膠電泳分離,證實(shí)成功構(gòu)建的載體克隆,在1mL的LB培養(yǎng)液中過(guò)夜培養(yǎng),送菌液樣品到上海生工生物有限公司測(cè)序。通過(guò)互聯(lián)網(wǎng) www.ncbi.nlm.nih.gov,打開(kāi)BLAST,輸入測(cè)序獲得的序列信息,進(jìn)行序列比對(duì)分析,正向測(cè)序部分結(jié)果見(jiàn)圖1B。endprint
2.2 熒光顯微鏡觀察 kin17在MEFs中定位
MEFs是原代細(xì)胞,pEGFP-N1和pEGFP-N1-kin17分別轉(zhuǎn)染野生型和Zmpste24-/- MEFs,熒光顯微鏡觀察細(xì)胞,見(jiàn)圖2。其中,第1列為檢測(cè)綠色熒光獲得的圖像。在野生型和突變型兩種細(xì)胞中GFP空載體轉(zhuǎn)染均可見(jiàn)GFP蛋的表達(dá)。無(wú)論是在野生型還是突變型,GFP單獨(dú)轉(zhuǎn)染對(duì)照細(xì)胞中均可見(jiàn)GFP分布于整個(gè)細(xì)胞中,包括細(xì)胞核與細(xì)胞漿。而GFP偶聯(lián)Kin17的轉(zhuǎn)染的細(xì)胞中,GFP熒光信號(hào)則絕大部分在細(xì)胞核內(nèi)呈均勻分散態(tài),并在細(xì)胞核中出現(xiàn)較多密度較高的聚集。第2列為UV通道檢測(cè)DAPI染細(xì)胞核圖像,細(xì)胞核清晰可見(jiàn),形態(tài)正常,均勻分布。第3列為第1和第2列圖像的疊加。
3 討論
Lmna基因通過(guò)不同的剪接過(guò)程表達(dá)lamin A/C蛋白(A型核纖層蛋白)。A型核纖層蛋白Lamin A/C與DNA的復(fù)制,轉(zhuǎn)錄,翻譯以及表觀遺傳學(xué)修飾等事件密切關(guān)聯(lián)[6]。關(guān)于kin17的研究發(fā)現(xiàn)并不多,目前認(rèn)為,kin17與DNA復(fù)制起始點(diǎn)密切結(jié)合;與非復(fù)制起始點(diǎn)比較,kin17與復(fù)制起始點(diǎn)DNA的結(jié)合力強(qiáng)10倍。kin17通過(guò)與T抗原相互作用,結(jié)合于SV40的DNA復(fù)制起點(diǎn)。由此可見(jiàn),kin17在DNA復(fù)制過(guò)程中與DNA復(fù)制起始關(guān)系更為密切。免疫電鏡也證實(shí)kin17與DNA復(fù)制相關(guān)蛋白質(zhì)RPA,PCNA,和DNA聚合酶 α 等共定位[9-10]。可見(jiàn),kin7與lamin A的關(guān)聯(lián)值得深入研究探討。我們通過(guò)Zmpste24-/-小鼠小鼠模型獲得Zmpste24基因缺失的MEFs,以此作為lamin A相關(guān)機(jī)制及早老癥相關(guān)機(jī)制研究的優(yōu)先細(xì)胞模型。我們希望能在Zmpste24-/-小鼠中表達(dá)GFP-kin17以建立一個(gè)新的便于研究kin17和lamin A關(guān)系的細(xì)胞模型。
本實(shí)驗(yàn)通過(guò)運(yùn)用PCR法,從質(zhì)粒中將人kin17 cDNA擴(kuò)增,并將其成功插入pEGFP-N1載體中,經(jīng)測(cè)序驗(yàn)證,成功構(gòu)建pEGFP-N1-kin17載體。同時(shí),我們成功從孕13.5d Zmpste24+/-雌小鼠中獲得MEFs。并通過(guò)抽提基因組DNA進(jìn)行運(yùn)用PCR法進(jìn)行基因型鑒定,其中E1,2,3,5為雜合子,E4為突變純合子,E6為野生型,見(jiàn)圖2A。隨后運(yùn)用免疫印跡方法將E6和E4的MEFs在蛋白水平進(jìn)行基因型鑒定,圖2B可見(jiàn)E4 中l(wèi)amin A的蛋白條帶明顯比E6的高,表明分子量變大,提示該MEFs克隆的lamin A前體蛋白無(wú)Zmpste24剪切,仍以prelamin A形式存在,該結(jié)果與PCR法獲得的基因型鑒定結(jié)果是一致的。將MEFs種于6孔板后,通過(guò)脂質(zhì)體轉(zhuǎn)染的方法,將pEGFP-N1空載體和pEGFP-N1-kin17載體導(dǎo)入野生型和Zmpste-/- MEFs活細(xì)胞內(nèi)。熒光顯微鏡觀察到,GFP蛋白在野生型和Zmpste24-/- MEFs中均為遍在表達(dá),包括細(xì)胞漿和細(xì)胞核,提示GFP在MEFs中成功表達(dá)[11]。同時(shí)轉(zhuǎn)染了pEGFP-N1-kin17載體的野生型和Zmpste-/- MEFs細(xì)胞中,GFP標(biāo)記的kin17只在細(xì)胞核內(nèi)表達(dá),這與其他實(shí)驗(yàn)室在不同細(xì)胞株中的實(shí)驗(yàn)結(jié)果一致[5],提示本實(shí)驗(yàn)成功構(gòu)建pEGFP-N1-kin17載體,并能在野生型和Zmpste-/- MEFs細(xì)胞中成功表達(dá)GFP-kin17。此時(shí)Zmpste24-/- MEFs中GFP-kin17的定位并無(wú)異常??梢?jiàn)異常prelamin A堆積,對(duì)kin17 的核內(nèi)定位未造成顯著影響,我們?cè)阽R下未見(jiàn)kin17有定位異常或出現(xiàn)明顯聚集體。是否這是因?yàn)楸緦?shí)驗(yàn)選用的是第二代的年輕態(tài)的MEFs細(xì)胞,此時(shí)基因缺失MEFs和野生型MEFs表型差異不夠大 ?或者提示lamin A與kin17相互作用的功能關(guān)系,有可能是存在于某些信號(hào)傳導(dǎo)通路(或電離輻射或UV照射)產(chǎn)生的DNA損傷等其他特定應(yīng)激事件中??jī)烧唛g的表達(dá)相互作用機(jī)制,還有待進(jìn)一步借助Zmpste24-/-? MEFs模型開(kāi)展深入研究。
[參考文獻(xiàn)]
[1] Kannouche P,Mauffrey P,Pinon-Lataillade G,et al. Molecular cloning and characterization of the human kin17 cDNA encoding a component of the uvc response that is conserved among metazoans[J]. Carcinogenesis,2000,21:1701-1710.
[2] Kannouche P,Pinon-Lataillade G,Tissier A,et al.The nuclear concentration of kin17, a mouse protein that binds to curved DNA, increases during cell proliferation and after uv irradiation[J]. Carcinogenesis,1998,19:781-789.
[3] Carlier L,le Maire A,Braud S,et al. Nmr assignment of region 51-160 of human kin17, a DNA and rna-binding protein[J].J Biomol NMR,2006,36(Suppl 1):29.
[4] Pinon-Lataillade G,Masson C,Bernardino-Sgherri J,et al. KIN17 encodes an RNA- binding protein and is expressed during mouse spermatogenesis[J].J Cell Sci,2004,117:3691-3702.endprint
[5]Masson C,Menaa F,Pinon-Lataillade G,et al.Identification of kin (kin17),a human gene encoding a nuclear DNA-binding protein,as a novel component of the tp53-independent response to ionizing radiation[J].Radiat Res,2001,156:535-544.
[6] Shimi T,Pfleghaar K,Kojima S,et al.The A- and B- type nuclear lamin networks: Microdomains involved in chromatin organization and transcription[J].Genes Dev,2008,22:3409-3421.
[7] Pendás A,Zhou Z,Cadinanos J,et al.Defective prelamin A processing and muscular and adipocyte alterations in Zmpste24 metalloproteinase–deficient mice[J].Nat Genet,2002,31(1):94-99.
[8] Liu B,Wang J,Chan KM,et al.Genomic instability in laminopathy-based premature aging[J].Nat Med, 2005,11 (7):780-785.
[9] Miccoli L,Biard DS,F(xiàn)rouin I,et al. Selective interactions of human kin17 and rpa proteins with chromatin and the nuclear matrix in a DNA damage- and cell cycle-regulated manner[J].Nucleic Acids Res,2003,31:4162-4175.
[10] Miccoli L,F(xiàn)rouin I,Novac O,et al.The human stress-activated protein kin17 belongs to the multiprotein DNA replication complex and associates in vivo with mammalian replication origins[J].Mol Cell Biol,2005,25:3814-3830.
[11] 梁桑華,石嶸,周暉,等.重組質(zhì)粒pDsRed1-C1-PinX1的建立及其在乳腺癌MCF-7細(xì)胞中的表達(dá)[J].廣東醫(yī)學(xué)院學(xué)報(bào),2013,31 (3):245-252.
(收稿日期:2014-05-15)endprint
[5]Masson C,Menaa F,Pinon-Lataillade G,et al.Identification of kin (kin17),a human gene encoding a nuclear DNA-binding protein,as a novel component of the tp53-independent response to ionizing radiation[J].Radiat Res,2001,156:535-544.
[6] Shimi T,Pfleghaar K,Kojima S,et al.The A- and B- type nuclear lamin networks: Microdomains involved in chromatin organization and transcription[J].Genes Dev,2008,22:3409-3421.
[7] Pendás A,Zhou Z,Cadinanos J,et al.Defective prelamin A processing and muscular and adipocyte alterations in Zmpste24 metalloproteinase–deficient mice[J].Nat Genet,2002,31(1):94-99.
[8] Liu B,Wang J,Chan KM,et al.Genomic instability in laminopathy-based premature aging[J].Nat Med, 2005,11 (7):780-785.
[9] Miccoli L,Biard DS,F(xiàn)rouin I,et al. Selective interactions of human kin17 and rpa proteins with chromatin and the nuclear matrix in a DNA damage- and cell cycle-regulated manner[J].Nucleic Acids Res,2003,31:4162-4175.
[10] Miccoli L,F(xiàn)rouin I,Novac O,et al.The human stress-activated protein kin17 belongs to the multiprotein DNA replication complex and associates in vivo with mammalian replication origins[J].Mol Cell Biol,2005,25:3814-3830.
[11] 梁桑華,石嶸,周暉,等.重組質(zhì)粒pDsRed1-C1-PinX1的建立及其在乳腺癌MCF-7細(xì)胞中的表達(dá)[J].廣東醫(yī)學(xué)院學(xué)報(bào),2013,31 (3):245-252.
(收稿日期:2014-05-15)endprint
[5]Masson C,Menaa F,Pinon-Lataillade G,et al.Identification of kin (kin17),a human gene encoding a nuclear DNA-binding protein,as a novel component of the tp53-independent response to ionizing radiation[J].Radiat Res,2001,156:535-544.
[6] Shimi T,Pfleghaar K,Kojima S,et al.The A- and B- type nuclear lamin networks: Microdomains involved in chromatin organization and transcription[J].Genes Dev,2008,22:3409-3421.
[7] Pendás A,Zhou Z,Cadinanos J,et al.Defective prelamin A processing and muscular and adipocyte alterations in Zmpste24 metalloproteinase–deficient mice[J].Nat Genet,2002,31(1):94-99.
[8] Liu B,Wang J,Chan KM,et al.Genomic instability in laminopathy-based premature aging[J].Nat Med, 2005,11 (7):780-785.
[9] Miccoli L,Biard DS,F(xiàn)rouin I,et al. Selective interactions of human kin17 and rpa proteins with chromatin and the nuclear matrix in a DNA damage- and cell cycle-regulated manner[J].Nucleic Acids Res,2003,31:4162-4175.
[10] Miccoli L,F(xiàn)rouin I,Novac O,et al.The human stress-activated protein kin17 belongs to the multiprotein DNA replication complex and associates in vivo with mammalian replication origins[J].Mol Cell Biol,2005,25:3814-3830.
[11] 梁桑華,石嶸,周暉,等.重組質(zhì)粒pDsRed1-C1-PinX1的建立及其在乳腺癌MCF-7細(xì)胞中的表達(dá)[J].廣東醫(yī)學(xué)院學(xué)報(bào),2013,31 (3):245-252.
(收稿日期:2014-05-15)endprint