The C Terminus of the Ribosomal-Associated Protein LrtA Is an Intrinsically Disordered Oligomer
Fecha
2018-12-05Autor
Neira Faleiro, José Luis
Giudici Besseghini, Ana Marcela
Hornos Adán, Felipe
Arbe Méndez, María Aranzazu
Rizzuti, Bruno
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International Journal Of Molecular Sciences 13(5) : (2018) // Article ID 3902
Resumen
The 191-residue-long LrtA protein of Synechocystis sp. PCC 6803 is involved in post-stress survival and in stabilizing 70S ribosomal particles. It belongs to the hibernating promoting factor (HPF) family, intervening in protein synthesis. The protein consists of two domains: The N-terminal region (N-LrtA, residues 1-101), which is common to all the members of the HPF, and seems to be well-folded; and the C-terminal region (C-LrtA, residues 102-191), which is hypothesized to be disordered. In this work, we studied the conformational preferences of isolated C-LrtA in solution. The protein was disordered, as shown by computational modelling, 1D-H-1 NMR, steady-state far-UV circular dichroism (CD) and chemical and thermal denaturations followed by fluorescence and far-UV CD. Moreover, at physiological conditions, as indicated by several biochemical and hydrodynamic techniques, isolated C-LrtA intervened in a self-association equilibrium, involving several oligomerization reactions. Thus, C-LrtA was an oligomeric disordered protein.