Solution Structure of the C-terminal X Domain of the Measles Virus Phosphoprotein and Interaction with the Intrinsically Disordered C-terminal Domain of the Nucleoprotein

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In this report, the solution structure of the nucleocapsid-binding domain of the measles virus phosphoprotein (XD, aa 459–507) is described. A dynamic description of the interaction between XD and the disordered C-terminal domain of the nucleocapsid protein, (NTAIL, aa 401–525), is also presented. XD is an all α protein consisting of a three-helix bundle with an up-down-up arrangement of the helices. The solution structure of XD is very similar to the crystal structures of both the free and bound form of XD. One exception is the presence of a highly dynamic loop encompassing XD residues 489–491, which is involved in the embedding of the α-helical XD-binding region of NTAIL. Secondary chemical shift values for full-length NTAIL were used to define the precise boundaries of a transient helical segment that coincides with the XD-binding domain, thus shedding light on the pre-recognition state of NTAIL. Titration experiments with unlabeled XD showed that the transient α-helical conformation of NTAIL is stabilized upon binding. Lineshape analysis of NMR resonances revealed that residues 483–506 of NTAIL are in intermediate exchange with XD, while the 475–482 and 507–525 regions are in fast exchange. The NTAIL resonance behavior in the titration experiments is consistent with a complex binding model with more than two states. Copyright © 2010 John Wiley & Sons, Ltd.

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Journal of Molecular Recognition, v. 23, issue 5, p. 435-447