Polyamines accelerate codon recognition by transfer RNAs on the ribosome.
Polyamines accelerate codon recognition by transfer RNAs on the ribosome.
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DOI:
10.1021/bi1009776
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发表时间:
2010-08-24
期刊:
影响因子:
2.9
通讯作者:
Joseph, Simpson
中科院分区:
文献类型:
--
作者:
Hetrick, Byron;Khade, Prashant K.;Lee, Kristin;Stephen, Jenise;Thomas, Alex;Joseph, Simpson
The selection of aminoacyl-tRNAs by the ribosome is a fundamental step in the elongation cycle of protein synthesis. tRNA selection is a multistep process that ensures only correct aminoacyltRNAs are accepted, while incorrect aminoacyl-tRNAs are rejected. A key step in tRNA selection is the formation of base pairs between the anticodon of the aminoacyl-tRNA and the mRNA codon in the A site, called “codon recognition”. Here, we report the development of a new, fluorescence-based, kinetic assay to monitor codon recognition by the ribosome. Using this assay we show that codon recognition is a second-order binding step under optimal conditions. Additionally, we show that at low Mg2+ concentration, the polyamines spermine and spermidine stimulate codon recognition by the ribosome without loss of fidelity. Polyamines may accelerate codon recognition by altering the structure and dynamics of the anticodon arm of the aminoacyl-tRNA.
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