The structure of TAX1BP1 UBZ1+2 provides insight into target specificity and adaptability.

TitleThe structure of TAX1BP1 UBZ1+2 provides insight into target specificity and adaptability.
Publication TypeJournal Article
Year of Publication2014
AuthorsM Ceregido, A., Amilibia M. SpĂ­nola, Buts L., Rivera-Torres J., Garcia-Pino A., Bravo J., and van Nuland N. A. J.
JournalJ Mol Biol
Volume426
Issue3
Pagination674-90
Date Published2014 Feb 06
Type of Articlenmr
ISSN1089-8638
KeywordsAmino Acid Motifs, Amino Acid Sequence, Crystallography, X-Ray, Humans, Intracellular Signaling Peptides and Proteins, Magnetic Resonance Spectroscopy, Molecular Sequence Data, Neoplasm Proteins, Protein Binding, Protein Structure, Tertiary, Scattering, Small Angle, Sequence Homology, Amino Acid, Signal Transduction, Ubiquitin
Abstract

TAX1BP1 is a novel ubiquitin-binding adaptor protein involved in the negative regulation of the NF-kappaB transcription factor, which is a key player in inflammatory responses, immunity and tumorigenesis. TAX1BP1 recruits A20 to the ubiquitinated signaling proteins TRAF6 and RIP1, leading to their A20-mediated deubiquitination and the disruption of IL-1-induced and TNF-induced NF-kappaB signaling, respectively. The two zinc fingers localized at its C-terminus function as novel ubiquitin-binding domains (UBZ, ubiquitin-binding zinc finger). Here we present for the first time both the solution and crystal structures of two classical UBZ domains in tandem within the human TAX1BP1. The relative orientation of the two domains is slightly different in the X-ray structure with respect to the NMR structure, indicating some degree of conformational flexibility, which is rationalized by NMR relaxation data. The observed degree of flexibility and stability between the two UBZ domains might have consequences on the recognition mechanism of interacting partners.

DOI10.1016/j.jmb.2013.11.006
Alternate JournalJ. Mol. Biol.
PubMed ID24239949
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