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. 1977 Jul;4(7):2161–2167. doi: 10.1093/nar/4.7.2161

Covalent attachment of fluorescent probes to the X-base of Escherichia coli phenylalanine transfer ribonucleic acid.

P W Schiller, A N Schechter
PMCID: PMC342555  PMID: 333386

Abstract

tRNA PheE, coli was labeled with the N-hydroxysuccinimide esters of 1-dimethylaminonaphthalene-5-sulfonyl glycine and N-methylanthranilic acid through reaction with the amino acid moiety of its X-base, whereby yields of 66% and 24%, respectively, were obtained. The purified dimethylaminonaphthalene-sulfonate derivative could not be aminoacylated and was found to be a strong competitive inhibitor of phenylalanine-tRNA synthetase [Ki=8X10(-7) M]. The N-methylanthraniloyl derivative could be charged to an extent of 5% as compared to native tRNA Phe. The fluorescence emission spectra of the derivatives are indicative of a slightly hydrophobic environment for both fluorophores. The results suggest that the integrity of the polar amino acid group of the X-base is required for the maintenance of the biologically active conformation.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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