Related Experiment Videos
Verprolin cytokinesis function mediated by the Hof one trap domain
Gang Ren1, Juan Wang, Ross Brinkworth
1Laboratory of Yeast Cell Biology, Institute of Molecular and Cell Biology, A*STAR Biomedical Sciences Institutes, Singapore, 138673, Republic of Singapore.
Traffic (Copenhagen, Denmark)
|June 9, 2005
Summary
Verprolin (Vrp1) binding to Hof1 via its HOT domain is essential for yeast cytokinesis. This interaction counteracts Hof1
Area of Science:
- Cell biology
- Molecular biology
- Biochemistry
Background:
- Cytokinesis, the process of cell division, involves cytoplasm partitioning.
- Budding yeast utilizes actomyosin ring-dependent or septum deposition pathways for cytokinesis.
- Hof1 (yeast PSTPIP1 ortholog) is an SH3 domain protein crucial for septum deposition-mediated cytokinesis.
Purpose of the Study:
- To investigate the role of verprolin (Vrp1) in Hof1-mediated cytokinesis.
- To elucidate the specific domains and interactions of Vrp1 critical for cytokinesis.
- To understand the regulatory mechanism of Hof1 in the septum deposition pathway.
Main Methods:
- Analysis of Vrp1 fragments with mutations in specific domains.
- Assessing Hof1 recruitment to the bud neck in yeast mutants.
- Investigating the functional requirement of the Vrp1 Hof one trap (HOT) domain and Hof1 SH3 domain in cytokinesis.
Main Results:
- A Vrp1 fragment's ability to bind the Hof1 SH3 domain via its HOT domain is critical for cytokinesis.
- The Vrp1 HOT domain directly interacts with the Hof1 SH3 domain.
- The Hof1 SH3 domain is not required for cytokinesis and negatively regulates the process; Vrp1 binding counteracts this inhibition.
Conclusions:
- The Vrp1 HOT domain plays a critical role in promoting cytokinesis by modulating Hof1 activity.
- Vrp1 facilitates cytokinesis by antagonizing the inhibitory effect of the Hof1 SH3 domain.
- This study reveals a novel regulatory mechanism in yeast cytokinesis involving Vrp1-Hof1 interaction.