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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Identification of the N-tosyl-L-phenylalanyl chloromethylketone modification site in Thermus thermophilus elongation factor Tu.

EF-Tu from Thermus thermophilus was first labelled with N-[14C]tosyl-L-phenylalaninechloromethylketone and then cleaved by the combined action of CNBr and trypsin. The resulting peptides were separated by reversed-phase HPLC. Analysis of the isolated, labelled peptide led to the identification of a sequence which was identical to residues 76-88 in T. thermophilus EF-Tu. The TPCK reactive site is at Cys-82. Kinetic measurements of the incorporation of TPCK into native EF-Tu and EF-Tu nicked at position Arg-59 were performed. The results provide evidence that the cleavage of the peptide bond between Arg-59 and Gly-60 does not lead to a dramatic conformational change of EF-Tu at the aa-tRNA binding site.[1]


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