Specific activity (nmol·s⁻¹·mg⁻¹) of DadB and comparison with other HLDs.

Group A, chlorinated or brominated alkanes longer than C3; Group B, chlorinated or brominated C2 and C3 alkanes; Group C, iodinated alkanes and halogenated cycloalkanes, alkenes, ethers, nitriles; Group D, other substrates used in activity assay of DadB. ND, no detectable activity. NA, no available activity. 2-Iodobutane is unstable and its spontaneous dehalogenation interferes the detection of iodine ion concentration seriously, so accurate activity to 2-iodobutane was not obtained. aThe activity data of these five HLDs were collected from the paper of Koudelakova et al. [18].组别A：碳链长度大于C3的氯代烷烃与溴代烷烃；组别B：C2及C3的氯代烷烃与溴代烷烃；组别C：碘代烷烃以及卤代环烷烃、烯烃、醚类与腈类；组别D：用于DadB活性测定的其余底物。 ND：未检测到活性（no detectable activity）；NA：无可用活性数据（no available activity）。 2-碘丁烷（2-Iodobutane）性质不稳定，其自发脱卤反应会严重干扰碘离子浓度的检测，因此无法获得针对2-碘丁烷的准确活性测定结果。 注：该五种卤代烷烃脱卤酶（HLD）的活性数据取自Koudelakova等人发表于文献[18]的研究。