Catalytic Cleavage of Disulfide Bonds in Small Molecules and Linkers of Antibody–Drug Conjugates
作者:Donglu Zhang、Aimee Fourie-O’Donohue、Peter S. Dragovich、Thomas H. Pillow、Jack D. Sadowsky、Katherine R. Kozak、Robert T. Cass、Liling Liu、Yuzhong Deng、Yichin Liu、Cornelis E.C.A. Hop、S. Cyrus Khojasteh
DOI:10.1124/dmd.118.086132
日期:2019.10
catalytic disulfide cleavage is an essential mechanism in protein folding and synthesis. However, detailed enzymatic catalytic mechanism relating cleavage of disulfide bonds in xenobiotics is not well understood. This study reports an enzymatic mechanism of cleavage of disulfide bonds in xenobiotic small molecules and antibody conjugate (ADC) linkers. The chemically stable disulfide bonds in substituted
在细胞中,催化性二硫键裂解是蛋白质折叠和合成中必不可少的机制。然而,关于异源生物中二硫键断裂的详细酶催化机理尚不清楚。这项研究报告了异源小分子和抗体偶联物(ADC)接头中二硫键断裂的酶促机制。发现在存在谷胱甘肽或半胱氨酸的情况下,取代的含二硫吡咯并苯并二氮杂pine(PBD,吡咯并[2,1-c] [1,4]苯并二氮杂)单体前药中的化学稳定二硫键在人类全血中孵育不稳定,并且大鼠。结果表明所涉及的酶是硫氧还蛋白(TRX)和戊二醛(GRX)。对于各种药物连接物偶联物,我们确定在TRX-还原酶和NADPH存在下TRX产生的裂解产物与催化二硫键裂解和连接基团的化合相一致。对GRX的研究不够严格。在所研究的化合物中,还证实了其在催化裂解中的作用。总的来说,这些体外实验表明,TRX和GRX可以催化小分子和ADC接头中二硫键的裂解。