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Biochem J. Nov 1975; 151(2): 377–386.
PMCID: PMC1172368

Isoaccepting lysine transfer ribonucleic acid species of Pseudomonas aeruginosa.

Abstract

Pseudomonas aeruginosa tRNA was treated with iodine, CNBr and N-ethylmaleimide, three thionucleotide-specific reagents. Reaction with iodine resulted in extensive loss of acceptor activity by lysine tRNA, glutamic acid tRNA, glutamine tRNA, serine tRNA and tyrosine tRNA. CNBr treatment resulted in high loss of acceptor ability by lysine tRNA, glutamic acid tRNA and glutamine tRNA. Only the acceptor ability of tyrosine tRNA was inhibited up to 66% by N-ethylmaleimide treatment, a reagent specific for 4-thiouridine. By the combined use of benzoylated DEAE-cellulose and DEAE-Sephadex columns, lysine tRNA of Ps. aeruginosa was resolved into two isoaccepting species, a major, tRNA Lys1 and a minor, tRNALys1. Co-chromatography of 14C-labelled tRNALys1 and 3H-labelled tRNALys2 on benzoylated DEAE-cellulose at pH 4.5 gave two distinct, non-superimposable profiles for the two activity peaks, suggesting that they were separate species. The acceptor activity of these two species was inhibited by about 95% by iodine and CNBr. Both the species showed equal response to codons AAA and AAG and also for poly(A) and poly(A1,G1) suggesting that the anticodon of these species was UUU. Chemical modification of these two species by iodine did not inhibit the coding response. The two species of lysine of Ps. aeruginosa are truly redundant in that they are indistinguishable either by chemical modification or by their coding response.

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Selected References

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