Transient electrostatic interactions dominate the conformational equilibrium sampled by multidomain splicing factor U2AF65: a combined NMR and SAXS study.

Abstract : Multidomain proteins containing intrinsically disordered linkers exhibit large-scale dynamic modes that play key roles in a multitude of molecular recognition and signaling processes. Here, we determine the conformational space sampled by the multidomain splicing factor U2AF65 using complementary nuclear magnetic resonance spectroscopy and small-angle scattering data. Available degrees of conformational freedom are initially stochastically sampled and experimental data then used to delineate the potential energy landscape in terms of statistical probability. The spatial distribution of U2AF65 conformations is found to be highly anisotropic, comprising significantly populated interdomain contacts that appear to be electrostatic in origin. This hypothesis is supported by the reduction of signature PREs reporting on expected interfaces with increasing salt concentration. The described spatial distribution reveals the complete spectrum of the unbound forms of U2AF65 that coexist with the small percentage of a preformed RNA-bound domain arrangement required for polypyrimidine-tract recognition by conformational selection. More generally, the proposed approach to describing conformational equilibria of multidomain proteins can be further combined with other experimental data that are sensitive to domain dynamics.
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Article dans une revue
Journal of the American Chemical Society, American Chemical Society, 2014, 136 (19), pp.7068-76
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http://hal.univ-grenoble-alpes.fr/hal-01131131
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Soumis le : vendredi 13 mars 2015 - 08:27:16
Dernière modification le : vendredi 13 avril 2018 - 20:12:01

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  • HAL Id : hal-01131131, version 1
  • PUBMED : 24734879

Citation

Jie-Rong Huang, Lisa R Warner, Carolina Sanchez, Frank Gabel, Tobias Madl, et al.. Transient electrostatic interactions dominate the conformational equilibrium sampled by multidomain splicing factor U2AF65: a combined NMR and SAXS study.. Journal of the American Chemical Society, American Chemical Society, 2014, 136 (19), pp.7068-76. 〈hal-01131131〉

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