Disordered TPPP/p25 binds GTP and displays Mg2+-dependent GTPase activity

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21 Citations (Scopus)


The disordered Tubulin Polymerization Promoting Protein/p25 (TPPP/p25) modulates the dynamics and stability of the microtubule system and plays a crucial role in differentiation of oligodendrocytes. Here we first demonstrated by multinuclear NMR that the extended disordered segments are localized at the N- and C-terminals straddling a flexible region. We showed by affinity chromatography, fluorescence spectroscopy and circular dichroism that GTP binds to TPPP/p25 likely within the flexible region; neither positions nor intensities of the peaks in the assigned terminals were affected by GTP. In addition, we demonstrated that TPPP/p25 specifically hydrolyses GTP in an Mg 2+-dependent manner. The GTPase activity is comparable with the intrinsic activities of small G proteins suggesting its potential role in multiple physiological processes.

Original languageEnglish
Pages (from-to)803-808
Number of pages6
JournalFEBS letters
Issue number5
Publication statusPublished - márc. 9 2011

ASJC Scopus subject areas

  • Biophysics
  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Genetics
  • Cell Biology

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