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- W2020415062 abstract "Polyglycylation is a posttranslational modification specific to tubulin. This modification was originally identified in highly stable microtubules from Paramecium cilia. As many as 34 posttranslationally added glycine residues have been located in the C-terminal domains of Paramecium α- and β-tubulin. In this study, post source decay matrix-assisted laser desorption/ionization mass spectrometry (PSD MALDI MS) and electrospray ionization on a hybrid quadrupole orthogonal time-of-flight tandem mass spectrometer (ESI Q-TOF MS/MS) were both used to demonstrate that a single molecule of β-tubulin, from either dynamic cytoplasmic microtubules or stable axonemal microtubules, can be glycylated on each of the last four C-terminal glutamate residues Glu437, Glu438, Glu439, and Glu441 in the sequence 427DATAEEEGEFEEEGEQ442. In both dynamic and stable microtubules the most abundant β-tubulin isoform contains six posttranslationally added glycine residues: two glycine residues on both Glu437 and Glu438 and one glycine residue on both Glu439 and Glu441. The number and relative abundance of glycylated isoforms of β-tubulin in both cytoplasmic and axonemal microtubules were compared by MALDI MS.1 The abundance of the major glycylated isoforms in axonemal tubulin decreases regularly with glycylation levels from 6 to 19 whereas it drops abruptly in cytoplasmic tubulin with glycylation levels from 6 to 9. However, the polyglycine chains are similarly distributed on the four C-terminal glutamate residues of cytoplasmic and axonemal tubulin. The polyglycylation results in bulky C-terminal domains with negatively charged surfaces, all surrounding the microtubular structure." @default.
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- W2020415062 date "1999-02-17" @default.
- W2020415062 modified "2023-10-18" @default.
- W2020415062 title "Structural Characterization by Tandem Mass Spectrometry of the Posttranslational Polyglycylation of Tubulin" @default.
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- W2020415062 doi "https://doi.org/10.1021/bi982304s" @default.
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