Protein sequences and three-dimensional structures of HUB1
(homologous to ubiquitin 1), ubiquitin and ubiquitin-like modifiers. (A)
Sequence alignment of HUB1 with ubiquitin, RUB1 and SUMO from Saccharomyces
cerevisiae. The scissors symbol indicates the processing site after the
di-glycine motif in ubiquitin, RUB1 and SUMO. (B) Structural ribbon
(top) and molecular surface representations (bottom) of HUB1 (S.
cerevisiae; Ramelot et al., 2003),
ubiquitin (Homo sapiens; Vijay-Kumar et al.,
1987), RUB1/NEDD8 (H. sapiens; Whitby et
al., 1998) and SUMO-1 (H. sapiens; Bayer
et al., 1998).