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链霉素对在大肠杆菌核糖体上形成的起始复合物的分解作用。

Breakdown by streptomycin of initiation complexes formed on ribosomes of Escherichia coli.

作者信息

Modolell J, Davis B D

出版信息

Proc Natl Acad Sci U S A. 1970 Nov;67(3):1148-55. doi: 10.1073/pnas.67.3.1148.

Abstract

Streptomycin induces breakdown of the completed 70S initiation complex on ribosomes of Escherichia coli, but it does not interfere with any step in the formation of the complex. Moreover, it does not appear to interact with the ribosome in any special way during initiation, since the kinetics of breakdown are the same whether streptomycin is added before formation of the initiation complex, or after its completion, or (as previously observed) after formation of a polypeptide. fMet-tRNA is released as such, without chain elongation; it is released from a puromycin-reactive ("P") site. Streptomycin thus appears to distort not only the A site of the ribosome (as suggested earlier) but also the P site.

摘要

链霉素可诱导大肠杆菌核糖体上已完成的70S起始复合物分解,但它不干扰该复合物形成过程中的任何步骤。此外,在起始过程中,链霉素似乎并未以任何特殊方式与核糖体相互作用,因为无论在起始复合物形成之前、形成之后添加链霉素,还是(如先前观察到的)在多肽形成之后添加链霉素,分解动力学都是相同的。甲酰甲硫氨酰 - tRNA原样释放,没有链的延伸;它从一个对嘌呤霉素有反应的(“P”)位点释放。因此,链霉素似乎不仅会扭曲核糖体的A位点(如先前所述),还会扭曲P位点。

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