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The NEXT-A (N-terminal EXtension with Transferase and ARS) reaction.

Nucleic Acids Symp Ser (Oxf). 2009(53):37-8
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摘要


L/F-transferase is known to catalyze transfer of hydrophobic amino acids from aminoacyl tRNA to the N-terminus of a protein possessing lysine or arginine as the N-terminus. Combining L/F-transferase with E. coli phenylalanyl-tRNA synthetase (ARS), we achieved non-ribosomal N-terminal-specific introduction of various kinds of nonnatural amino acids to a protein. A nonnatural amino acid is once charged onto an E. coli tRNA(Phe) by a mutant ARS in situ, and successively transferred from the tRNA to a target protein, namely the NEXT-A reaction. Besides alphaA294G mutation on the ARS, alphaT251A, betaG318W, or betaA356W double-mutation were effective to increase the introduction efficiency through the NEXT-A reaction. Protein specific fluorescence labelling via the NEXT-A reaction followed by Huisgen cycloaddition was also demonstrated.

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