Tompkins R K, Scolnick E M, Caskey C T
Proc Natl Acad Sci U S A. 1970 Mar;65(3):702-8. doi: 10.1073/pnas.65.3.702.
Release factors participate in release of fMet from fMet-tRNA . AUG . ribosome intermediates upon binding to ribosomes. This release requires R factor and occurs in the absence of terminator codon in reactions containing 20 per cent ethanol. Release occurs only when both 30S and 50S ribosomal subunits are present and when fMet-tRNA is located in the ribosomal P site. Release factor-dependent deacylation of fMet-tRNA is inhibited by sparsomycin, amicetin, lincocin, and chloramphenicol, antibiotics which have little effect on binding of R factor to ribosomes. The possible role of peptidyl transferase in the release reaction is discussed.
释放因子参与从甲酰甲硫氨酰 - tRNA·AUG·核糖体中间体上释放甲酰甲硫氨酸,该过程发生在其与核糖体结合后。这种释放需要R因子,并且在含有20%乙醇的反应中,即使没有终止密码子也会发生。释放仅在30S和50S核糖体亚基都存在且甲酰甲硫氨酰 - tRNA位于核糖体P位点时才会发生。甲酰甲硫氨酰 - tRNA的释放因子依赖性去酰化作用受到稀疏霉素、友菌素、林可霉素和氯霉素的抑制,这些抗生素对R因子与核糖体的结合几乎没有影响。文中还讨论了肽基转移酶在释放反应中可能发挥的作用。