Posttranslational modifications of alpha- and beta-tubulin in Giardia lamblia, an ancient eukaryote

FEBS Letters
K WeberUwe Plessmann

Abstract

Tubulin of Giardia lamblia, a representative of the oldest eukaryotes, was screened for posttranslational modifications. Mass spectrometry of the carboxy-terminal peptides documents a large number of variants. Both alpha- and beta-tubulin show polyglycylation with up to 20 and 15 extra glycyl residues respectively. Minor variants show a low level of glutamylation without or with glycylation. The glutamylation-specific antibody GT335 detects alpha- and beta-tubulin in immunoblots. The terminal tyrosine is fully retained in alpha-tubulin, which is completely acetylated at Lys-40. Thus except for the detyrosination/tyrosination cycle all posttranslational modifications known for higher eukaryotes are already present in Giardia.

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