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Quantitative study of stereospecific binding of monoclonal antibody to anti-benzo(a)pyrene diol epoxide-N-2-dG adducts by capillary electrophoresis immunoassay

机译:单克隆抗体与抗苯并(a)py二醇环氧-N-2-dG加合物立体定向结合的定量研究

摘要

The stereospecific binding of monoclonal antibody (mAb) 8E11 to anti-benzo(a)pyrene diol epoxide (BPDE)-dG adducts in single nucleoside, long oligonucleotide, and genomic DNA were quantitatively evaluated using noncompetitive and competitive capillary electrophoresis (CE) immunoassays. Two single-stranded TMR-BPDE-90mers containing a single anti-BPDE-dG adduct with defined stereochemistry and a fluorescent label at 5'-end were used as fluorescent probes for competitive CE immunoassay. To quantitatively evaluate the binding affinity through competitive CE immunoassays, a series of equations were derived according to the binding stoichiometry. The binding of mAb 8E11 to trans-(+)-anti-BPDE-dG displays strongest affinity (K-b: 3.57 x 10(8) M-1)among all four investigated anti-BPDE-dG mononucleoside adducts, and the cis-(-)-anti-BPDE-dG displays lowest affinity (K-b: 1.14 x 10(7) M-1). The binding of monoclonal antibody (mAb) 8E11 to BPDE-dG adducts in long DNA (90mer) preferentially forms the complex with a stoichiometry of 1:1, and that mAb 8E11 displays a slightly higher affinity with trans-(+)-anti-BPDE-90mers (K-b: 6.36 +/- 0.54 x 10(8) M-1) than trans-(-)-anti-BPDE-90mers (K-b: 4.52 +/- 0.52 x 10(8) M-1). The mAb 8E11 also displays high affinity with BPDE-dG adducts in genomic DNA (K-b: 3.74 x 10(8) M-1), indicating its promising applications for sensitive immuno-detection of BPDE-DNA adducts in genomic DNA. (C) 2010 Elsevier B.V. All rights reserved.
机译:使用非竞争性和竞争性毛细管电泳(CE)免疫分析定量评估了单核苷,长寡核苷酸和基因组DNA中单克隆抗体(mAb)8E11与抗苯并(a)py二醇环氧化合物(BPDE)-dG加合物的立体特异性结合。含有一个具有确定的立体化学的单一抗BPDE-dG加合物和5'末端的荧光标记的两个单链TMR-BPDE-90mer用作竞争性CE免疫测定的荧光探针。为了通过竞争性CE免疫测定定量评估结合亲和力,根据结合化学计量法推导出了一系列方程。 mAb 8E11与反-(+)-抗BPDE-dG的结合显示出在所有四个研究的抗BPDE-dG单核苷加合物和顺式-(-中最强的亲和力(Kb:3.57 x 10(8)M-1) -)-抗BPDE-dG显示出最低的亲和力(Kb:1.14 x 10(7)M-1)。长DNA(90mer)中的单克隆抗体(mAb)8E11与BPDE-dG加合物的结合优先形成化学计量比为1:1的复合物,并且mAb 8E11与反式(+)-抗-抗体显示出更高的亲和力BPDE-90mers(Kb:6.36 +/- 0.54 x 10(8)M-1)比反式(-)-抗BPDE-90mers(Kb:4.52 +/- 0.52 x 10(8)M-1)。 mAb 8E11还显示了与基因组DNA中的BPDE-dG加合物的高亲和力(K-b:3.74 x 10(8)M-1),表明其在基因组DNA中的BPDE-DNA加合物的灵敏免疫检测中很有希望的应用。 (C)2010 Elsevier B.V.保留所有权利。

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