The Pluripotency Rheostat Nanog Functions as a Dimer

Adam Yates, Nicholas P. Mullin, Arthur J. Rowe, Bianca Nijmeijer, Douglas Colby, Paul N. Barlow, Malcolm D. Walkinshaw, Ian Chambers

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66 Citations (Scopus)

Abstract

The defining activity of the homeodomain protein Nanog is the ability to confer cytokine-independent self-renewal upon ES (embryonic stem) cells in which it is overexpressed. However, the biochemical basis by which Nanog achieves this function remains unknown. In the present study, we show that Nanog dimerizes through a functionally critical domain. Co-immunoprecipitation of Nanog molecules tagged with distinct epitopes demonstrates that Nanog self-associates through a region in which every fifth residue is tryptophan. In vitro binding experiments establish that this region participates directly in self-association. Moreover, analytical ultracentrifugation indicates that, in solution, Nanog is in equilibrium between monomeric and dimeric forms with a Kd of 3 μM. The functional importance of Nanog dimerization is established by ES cell colony-forming assays in which deletion of the tryptophan-repeat region eliminates the capacity of Nanog to direct LIF (leukaemia inhibitory factor)-independent self-renewal.

Original languageEnglish
Pages (from-to)227-231
Number of pages5
JournalBiochemical Journal
Volume411
Issue number2
DOIs
Publication statusPublished - 15 Apr 2008
Externally publishedYes

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    Yates, A., Mullin, N. P., Rowe, A. J., Nijmeijer, B., Colby, D., Barlow, P. N., Walkinshaw, M. D., & Chambers, I. (2008). The Pluripotency Rheostat Nanog Functions as a Dimer. Biochemical Journal, 411(2), 227-231. https://doi.org/10.1042/BJ20080134