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And yet it moves: active site remodeling in the SUMO E1
Daniel Völler1, Hermann Schindelin
1Rudolf Virchow Center for Experimental Biomedicine, University of Würzburg, Josef-Schneider-Str. 2, 97080 Würzburg, Germany.
Structure (London, England : 1993)
|April 20, 2010
Summary
Enzyme E1 undergoes significant shape changes, bringing distant active sites together for ubiquitin-like protein activation. This movement, including a large shift of the active site cysteine, is crucial for protein modification.
Area of Science:
- Biochemistry
- Molecular Biology
- Enzymology
Background:
- Ubiquitin and ubiquitin-like proteins are essential for cellular regulation.
- Their activation is catalyzed by E1 enzymes through adenylation and thioesterification.
- These reactions traditionally involve two spatially separated active sites.
Discussion:
- Olsen et al. (2010) investigated the conformational dynamics of the SUMO E1 enzyme.
- The study revealed substantial structural rearrangements within the E1 enzyme.
- These changes effectively merge the adenylation and thioesterification active sites.
Key Insights:
- A dramatic conformational change spatially unites the adenylation and thioesterification sites in SUMO E1.
- The active site cysteine residue undergoes a significant displacement of over 30 Å.
- This dynamic mechanism is critical for the efficient activation of SUMO proteins.
Outlook:
- Understanding these conformational changes provides insights into E1 enzyme mechanism.
- This knowledge could be relevant for developing therapeutics targeting ubiquitination pathways.
- Further studies can explore similar dynamics in other E1 enzymes.
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