title: Solution structure of the N-terminal domain of DC-UbP/UBTD2 and its interaction with ubiquitin.
abstract: DC-UbP/UBTD2 is a ubiquitin (Ub) domain-containing protein first identified from dendritic cells, and is implicated in ubiquitination pathway. The solution structure and backbone dynamics of the C-terminal Ub-like (UbL) domain were elucidated in our previous work. To further understand the biological function of DC-UbP, we then solved the solution structure of the N-terminal domain of DC-UbP (DC-UbP_N) and studied its Ub binding properties by NMR techniques. The results show that DC-UbP_N holds a novel structural fold and acts as a Ub-binding domain (UBD) but with low affinity. This implies that the DC-UbP protein, composing of a combination of both UbL and UBD domains, might play an important role in regulating protein ubiquitination and delivery of ubiquitinated substrates in eukaryotic cells.
authors.affiliation: State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China.
authors.forename: Ai-Xin
authors.initials: AX
authors.lastname: Song
authors.forename: Chen-Jie
authors.initials: CJ
authors.lastname: Zhou
authors.forename: Xiao
authors.initials: X
authors.lastname: Guan
authors.forename: Kong-Hung
authors.initials: KH
authors.lastname: Sze
authors.forename: Hong-Yu
authors.initials: HY
authors.lastname: Hu
mesh_terms: D003713:Dendritic Cells / Q000737:chemistry; D004926:Escherichia coli / Q000235:genetics; D006801:Humans; D008958:Models, Molecular; D015233:Models, Statistical; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods*; D017434:Protein Structure, Tertiary / Q000235:genetics; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D025801:Ubiquitin / Q000737:chemistry* / Q000378:metabolism; D014452:Ubiquitins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism
chemical_list: D011994:Recombinant Proteins; C471042:UBTD2 protein, human; D025801:Ubiquitin; D014452:Ubiquitins