Exploring the limits of codon and anticodon size
- PMID: 11880038
- DOI: 10.1016/s1074-5521(02)00094-7
Exploring the limits of codon and anticodon size
Abstract
We previously employed a combinatorial approach to identify the most efficient suppressors of four-base codons in E. coli. We have now examined the suppression of two-, three-, four-, five-, and six-base codons with tRNAs containing 6-10 nt in their anticodon loops. We found that the E. coli translational machinery tolerates codons of 3-5 bases and that tRNAs with 6-10 nt anticodon loops can suppress these codons. However, N-length codons were found to prefer N + 4-length anticodon loops. Additionally, sequence preferences, including the requirement of Watson-Crick complementarity to the codon, were evident in the loops. These selections have yielded efficient suppressors of four-base and five-base codons for our ongoing efforts to expand the genetic code. They also highlight some of the parameters that underlie the fidelity of frame maintenance.
Comment in
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Custom codons come in threes, fours, and fives.Chem Biol. 2002 Feb;9(2):143. doi: 10.1016/s1074-5521(02)00107-2. Chem Biol. 2002. PMID: 11880028
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