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2013 ; 85
(12
): 5827-34
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Using glycinylation, a chemical derivatization technique, for the quantitation of
ubiquitinated proteins
#MMPMID23682733
Fiedler KL
; Cotter RJ
Anal Chem
2013[Jun]; 85
(12
): 5827-34
PMID23682733
show ga
The quantitation of lysine post-translational modifications (PTMs) by bottom-up
mass spectrometry is convoluted by the need for analogous derivatives and the
production of different tryptic peptides from the unmodified and modified
versions of a protein. Chemical derivatization of lysines prior to enzymatic
digestion circumvents these problems and has proven to be a successful method for
lysine PTM quantitation. The most notable example is the use of
deuteroacetylation to quantitate lysine acetylation. In this work, levels of
lysine ubiquitination were quantitated using a structurally homologous label that
is chemically similar to the diglycine (GlyGly) tag, which is left at the
ubiquitination site upon trypsinolysis. The LC-MS analysis of a chemically
equivalent monoglycine (Gly) tag that is analogous to the corresponding GlyGly
tag proved that the monoglycine tag can be used for the quantitation of
ubiquitination. A glycinylation protocol was then established for the
derivatization of proteins to label unmodified lysine residues with a single
glycine tag. Ubiquitin multimers were used to show that after glycinylation and
tryptic digestion, the mass spectrometric response from the corresponding
analogous tagged peptides could be compared for relative quantitation. For a
proof of principle regarding the applicability of this technique to the analysis
of ubiquitination in biological samples, the glycinylation technique was used to
quantitate the increase in monoubiquitinated histone H2B that is observed in
yeast which lacks the enzyme responsible for deubiquitinating H2B-K123, compared
to wild-type yeast.