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Mapping the interactions between a RUN domain from DENND5/Rab6IP1 and sorting nexin 1
Humberto Fernandes1, Edward Franklin, Florence Jollivet
1School of Biochemistry and Immunology, Trinity College, Dublin, Ireland.
Plos One
|May 5, 2012
Summary
Researchers explored the function of Rab6 effector DENND5 in vesicle trafficking. They discovered that the RUN2 domain of DENND5 interacts with sorting nexin 1, shedding light on effector protein roles in cellular transport.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Rab GTPases are key regulators of eukaryotic vesicle trafficking.
- DENND5 (Rab6IP1) is a Rab6 effector protein with poorly understood functional domains.
- Previous studies elucidated the role of DENND5's RUN1 domain in Golgi recruitment.
Purpose of the Study:
- To investigate the functional role of the RUN2 domain of DENND5.
- To identify novel interaction partners of DENND5.
Main Methods:
- Surface plasmon resonance (SPR) analysis was used to study protein-protein interactions.
- Expression and purification of soluble DENND5 constructs.
Main Results:
- A soluble DENND5 construct containing the RUN2 domain was shown to bind to the N-terminal region of sorting nexin 1.
- This interaction was detected using surface plasmon resonance.
Conclusions:
- The RUN2 domain of DENND5 plays a role in protein-protein interactions within vesicle trafficking pathways.
- DENND5 interacts with sorting nexin 1, suggesting a novel regulatory mechanism in Golgi trafficking.
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