2PX9

The intrinsic affinity between E2 and the Cys domain of E1 in Ubiquitin-like modifications

Summary for 2PX9

• Entry DOI: 10.2210/pdb2px9/pdb
• Descriptor: SUMO-activating enzyme subunit 2, SUMO-conjugating enzyme UBC9 (2 entities in total)
• Functional Keywords: ubiquitination, sumo, e1, e2, ubc9, sae2, protein-protein interaction, paramagnetic spin-labeling, protein binding
• Biological source: Homo sapiens (human); More
• Cellular location: Nucleus: Q9UBT2 P63279
• Total number of polymer chains: 2
• Total formula weight: 42864.67

Authors

Wang, J.H.,Hu, W.D.,Cai, S.,Lee, B.,Song, J.,Chen, Y. (deposition date: 2007-05-14, release date: 2007-07-24, Last modification date: 2024-05-22)

Primary citation

Wang, J.,Hu, W.,Cai, S.,Lee, B.,Song, J.,Chen, Y.
The intrinsic affinity between E2 and the Cys domain of E1 in ubiquitin-like modifications.
Mol.Cell, 27:228-237, 2007

PubMed Abstract: Ubiquitin-like modifications, which are carried out by similar biochemical mechanisms, regulate nearly every aspect of cellular function. Despite the recent advancements in characterizing their enzymology, our knowledge about the dynamic processes of these modifications is still fragmentary. In this study, we have uncovered an intrinsic affinity between the SUMO E2 and the Cys domain of SUMO E1. NMR studies in combination with paramagnetic spin labeling demonstrate that this interaction is mediated by previously unknown interfaces on both E1 and E2 and places the two catalytic Cys residues of the two enzymes in close proximity. Site-directed mutagenesis and enzymatic assays indicate that the interaction is fundamentally important for the transfer of SUMO from E1 to E2. Results from this study suggest that the interaction between E2 and the Cys domain of E1 participates in guiding the E2's translocation to E1's enzymatic active site in ubiquitin-like modifications.

PubMed: 17643372
DOI: 10.1016/j.molcel.2007.05.023

Experimental method

SOLUTION NMR