Crystal structure of murine/human Ubc9 provides insight into the variability of the ubiquitin-conjugating system - PubMed (original) (raw)
Comparative Study
. 1997 Aug 22;272(34):21381-7.
doi: 10.1074/jbc.272.34.21381.
Affiliations
- PMID: 9261152
- DOI: 10.1074/jbc.272.34.21381
Free article
Comparative Study
Crystal structure of murine/human Ubc9 provides insight into the variability of the ubiquitin-conjugating system
H Tong et al. J Biol Chem. 1997.
Free article
Abstract
Murine/human ubiquitin-conjugating enzyme Ubc9 is a functional homolog of Saccharomyces cerevisiae Ubc9 that is essential for the viability of yeast cells with a specific role in the G2-M transition of the cell cycle. The structure of recombinant mammalian Ubc9 has been determined from two crystal forms at 2.0 A resolution. Like Arabidopsis thaliana Ubc1 and S. cerevisiae Ubc4, murine/human Ubc9 was crystallized as a monomer, suggesting that previously reported hetero- and homo-interactions among Ubcs may be relatively weak or indirect. Compared with the known crystal structures of Ubc1 and Ubc4, which regulate different cellular processes, Ubc9 has a 5-residue insertion that forms a very exposed tight beta-hairpin and a 2-residue insertion that forms a bulge in a loop close to the active site. Mammalian Ubc9 also possesses a distinct electrostatic potential distribution that may provide possible clues to its remarkable ability to interact with other proteins. The 2-residue insertion and other sequence and structural heterogeneity observed at the catalytic site suggest that different Ubcs may utilize catalytic mechanisms of varying efficiency and substrate specificity.
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