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Beta-methylthio-aspartic acid: identification of a novel posttranslational modification in ribosomal protein S12 from Escherichia coli.

Kowalak J.A., Walsh K.A.

Utilizing microscale chemical derivatization reactions and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry, we have identified a novel posttranslational modification of aspartic acid, beta-methylthio-aspartic acid. The modified residue is located at position 88 in ribosomal protein S12 from Escherichia coli, a phylogenetically conserved protein that has been implicated in maintaining translational accuracy of the ribosome.

Protein Sci. 5:1625-1632(1996) [PubMed] [Europe PMC]

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