噬菌体T4 DNA注入过程中对膜电位的要求。
Requirement for membrane potential in injection of phage T4 DNA.
作者信息
Labedan B, Goldberg E B
出版信息
Proc Natl Acad Sci U S A. 1979 Sep;76(9):4669-73. doi: 10.1073/pnas.76.9.4669.
Abstract
The first stages of infection by phage T4 may be divided into energy-dependent and energy-independent processes. Irreversible adsorption, unplugging, and initial exposure of the DNA terminus may occur at 4 degrees C, or at 37 degrees C in bacteria whose energy-yielding metabolism has been poisoned. DNA injection into the cytoplasm needs higher temperatures and energy from the host cell. The nature of this energy requirements was deduced from the use of metabolic inhibitors. Our results show that T4 DNA injection specifically requires the presence of a protonmotive force across the cytoplasmic membrane of the host. Moreover, the chemical gradient (delta pH) does not appear to be essential, but the membrane potential (delta psi) is required.
摘要
噬菌体T4感染的最初阶段可分为能量依赖和非能量依赖过程。不可逆吸附、脱塞以及DNA末端的初始暴露可能在4℃时发生，或者在产能代谢已被毒害的细菌中于37℃时发生。DNA注入细胞质需要更高的温度以及宿主细胞提供的能量。这种能量需求的性质是通过使用代谢抑制剂推断出来的。我们的结果表明，T4 DNA注入特别需要宿主细胞质膜上存在质子动力势。此外，化学梯度（ΔpH）似乎并非必不可少，但膜电位（Δψ）是必需的。
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