Binding of polyubiquitin chains to ubiquitin-associated (UBA) domains of HHR23A - PubMed (original) (raw)
Binding of polyubiquitin chains to ubiquitin-associated (UBA) domains of HHR23A
Shahri Raasi et al. J Mol Biol. 2004.
Abstract
Ubiquitin-associated (UBA) domains are small protein domains that occur in the context of larger proteins and are likely to function as inter- and intramolecular communication elements in ubiquitin/polyubiquitin signaling. Although monoubiquitin/UBA complexes are well characterized, much less is known about UBA/polyubiquitin complexes, even though polyubiquitin chains are believed to be biologically relevant ligands of many UBA domain proteins. Here, we report the results of a quantitative study of the interaction of K48-linked polyubiquitin chains with UBA domains of the DNA repair/proteolysis protein HHR23A, using surface plasmon resonance and other approaches. We present evidence that the UBL domain of HHR23A negatively regulates polyubiquitin/UBA interactions and identify leucine 8 of ubiquitin as an important determinant of chain recognition. A striking relationship between binding affinity and chain length suggests that maximum affinity is associated with a conformational feature that is fully formed in chains of n = 4-6 and can be recognized by a single UBA domain of HHR23A. Our findings provide new insights into polyubiquitin chain recognition and set the stage for future structural investigations of UBA/polyubiquitin complexes.
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