PMID: 15987890 , Related PDB id: 1TTN

Authors:

Gao YG, Song AX, Shi YH, Chang YG, Liu SX, Yu YZ, Cao XT, Lin DH, Hu HY

Title:

Solution structure of the ubiquitin-like domain of human DC-UbP from dendritic cells.

Journal:

Protein Sci. 2005 Aug;14(8):2044-50. Epub 2005 Jun 29.

Abstract:

The previously identified dendritic cell-derived ubiquitin-like protein (DC-UbP) was implicated in cellular differentiation and apoptosis. Sequence alignment suggested that it contains a ubiquitin-like (UbL) domain in the C terminus. Here, we present the solution NMR structure and backbone dynamics of the UbL domain of DC-UbP. The overall structure of the domain is very similar to that of Ub despite low similarity (<30%) in amino-acid sequence. One distinct feature of the domain structure is its highly positively charged surface that is different from the corresponding surfaces of the well-known UbL modifiers, Ub, NEDD8, and SUMO-1. The key amino-acid residues responsible for guiding polyubiquitinated proteins to proteasome degradation in Ub are not conserved in the UbL domain. This implies that the UbL domain of DC-UbP may have its own specific interaction partners with other yet unknown cellular functions related to the Ub pathway.