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submitted on 27.12.2019 and posted on 31.12.2019by Matthew T Olson, Alfred L Yergey, Kamalika Mukherjee, melissa Pergande, susan Bane, Stephanie Cologna, Dan Sackett
We use various methods of high resolution mass spectrometry to demonstrate that taurine is covalently attached to the carboxyl terminus of alpha Tubulin from avian erythrocytes. The alpha Tubulin terminal residue, a tyrosine, must already be removed before covalent addition of taurine, via a known cycle of de-tyrosination and re-tyrosination. Taurination appears to stop this cycle. Taurine is the most abundant free amino acid in the body but this is the first time that it has been shown to be covalently incorporated into any protein.