Ribosome selectivity and nascent chain context in modulating the incorporation of fluorescent non-canonical amino acid into proteins

被引:3
|
作者
Thommen, Michael [1 ]
Draycheva, Albena [1 ]
Rodnina, Marina, V [1 ]
机构
[1] Max Planck Inst Multidisciplinary Sci, Dept Phys Biochem, Gottingen, Germany
基金
欧洲研究理事会;
关键词
SITE-SPECIFIC INCORPORATION; PEPTIDE-BOND FORMATION; ELONGATION-FACTOR TU; CELL-FREE TRANSLATION; TRANSFER-RNA; ESCHERICHIA-COLI; GENETIC-CODE; DELIVERY; BINDING; FRET;
D O I
10.1038/s41598-022-16932-7
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Fluorescence reporter groups are important tools to study the structure and dynamics of proteins. Genetic code reprogramming allows for cotranslational incorporation of non-canonical amino acids at any desired position. However, cotranslational incorporation of bulky fluorescence reporter groups is technically challenging and usually inefficient. Here we analyze the bottlenecks for the cotranslational incorporation of NBD-, BodipyFL- and Atto520-labeled Cys-tRNA(Cys) into a model protein using a reconstituted in-vitro translation system. We show that the modified Cys-tRNA(Cys) can be rejected during decoding due to the reduced ribosome selectivity for the modified aa-tRNA and the competition with native near-cognate aminoacyl-tRNAs. Accommodation of the modified Cys-tRNA(Cys) in the A site of the ribosome is also impaired, but can be rescued by one or several Gly residues at the positions -1 to -4 upstream of the incorporation site. The incorporation yield depends on the steric properties of the downstream residue and decreases with the distance from the protein N-terminus to the incorporation site. In addition to the full-length translation product, we find protein fragments corresponding to the truncated N-terminal peptide and the C-terminal fragment starting with a fluorescence-labeled Cys arising from a StopGo-like event due to a defect in peptide bond formation. The results are important for understanding the reasons for inefficient cotranslational protein labeling with bulky reporter groups and for designing new approaches to improve the yield of fluorescence-labeled protein.
引用
收藏
页数:14
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