TAK1-binding protein 2 (TAB2) has generally been considered to bind specifically to K63-linked polyubiquitin chains via its C-terminal Npl4 zinc-finger (NZF) domain. However, a recent study showed that the NZF domain of TAB2 (TAB2-NZF) could also interact with K6-linked polyubiquitin chains ...
TAK1-binding protein 2 (TAB2) has generally been considered to bind specifically to K63-linked polyubiquitin chains via its C-terminal Npl4 zinc-finger (NZF) domain. However, a recent study showed that the NZF domain of TAB2 (TAB2-NZF) could also interact with K6-linked polyubiquitin chains. Here, we report the crystal structure of TAB2-NZF in complex with K6-linked diubiquitin (K6-Ub 2 ) at 1.99-Å resolution. TAB2-NZF simultaneously interacts with the distal and proximal ubiquitin moieties of K6-Ub 2 . By comparing the structures of TAB2-NZF in complex with K6-Ub 2 and with K63-linked diubiquitin (K63-Ub 2 ), we reveal that the binding mechanism of TAB2-NZF with K6-Ub 2 is similar to that with K63-Ub 2 , except for the flexible C-terminal region of the distal ubiquitin. Therefore, we conclude that the C-terminal flexibility of the distal ubiquitin contributes to the dual specificity of TAB2-NZF toward K6- and K63-linked ubiquitin chains. This study provides important insights into the functions of K6-linked ubiquitin chains, which are currently unclear.
Organizational Affiliation:
Center for Research on Green Sustainable Chemistry, Tottori, Japan; Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University, Tottori, Japan. Electronic address: yusato@tottori-u.ac.jp.
Download Mendeley
