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The SUMO-specific protease SENP5 is required for cell division.
Alessandra Di Bacco1, Jian Ouyang, Hsiang-Ying Lee
1Department of Pathology, Harvard Medical School, 77 Ave. Louis Pasteur, Boston, MA 02115, USA.
Molecular and Cellular Biology
|June 2, 2006
Summary
SENP5 is a novel SUMO-specific protease crucial for cell division. It regulates SUMOylation levels, impacting mitosis and nuclear morphology, highlighting its essential role in cell proliferation.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Posttranslational modification by SUMOylation regulates key cellular processes.
- SUMOylation is reversible, mediated by SUMO-specific proteases (SENPs).
- SENP5 is a newly identified mammalian homolog of yeast Ulp1.
Purpose of the Study:
- To characterize the enzymatic activity and cellular function of SENP5.
- To investigate SENP5's substrate specificity and localization.
- To determine SENP5's role in cell division.
Main Methods:
- In vitro assays for SUMO C-terminal hydrolase and isopeptidase activity.
- Cotransfection assays to assess de-SUMOylation in vivo.
- RNA interference (RNAi) for SENP5 knockdown.
- Immunofluorescence microscopy for protein localization.
Main Results:
- SENP5 exhibits SUMO C-terminal hydrolase and SUMO isopeptidase activities.
- SENP5 preferentially processes SUMO-3 and removes SUMO-2/3 from RanGAP1.
- SENP5 localizes to the nucleolus; N-terminal deletion affects localization and activity.
- SENP5 knockdown causes increased SUMO conjugates, impaired proliferation, and cell division defects.
Conclusions:
- SENP5 is a SUMO-specific protease essential for cell division (mitosis/cytokinesis).
- Distinct substrate specificities of SENPs are determined by both catalytic and noncatalytic domains.
- SENP5 plays a critical role in regulating SUMOylation dynamics during the cell cycle.