Conformational alteration of DOCK5•ELMO1 signalosome on lipid membrane
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View abstract on PubMed
Summary
This summary is machine-generated.The DOCK5•ELMO1 complex adopts a flattened conformation on lipid membranes, regulated by acidic lipids. This membrane interaction is crucial for controlling guanine nucleotide exchange factor (GEF) activity and downstream signaling.
Area Of Science
- Molecular Biology
- Cell Signaling
- Structural Biology
Background
- The DOCK protein family acts as guanine nucleotide exchange factors (GEFs) for Rho small GTPases.
- DOCK proteins are believed to function at the plasma membrane, but regulatory mechanisms remain elusive.
Purpose Of The Study
- To elucidate the regulatory mechanism of DOCK protein activity on the plasma membrane.
- To determine the structural basis for DOCK-mediated GEF activity at the membrane interface.
Main Methods
- Cryo-electron microscopy (cryo-EM) on a lipid membrane-coated grid.
- Biochemical assays to assess GEF activity.
- Cellular experiments to evaluate downstream signaling.
Main Results
- A novel, flattened conformation of the DOCK5•ELMO1 complex interacting with a lipid membrane was revealed.
- Membrane interactions, particularly with acidic lipids, induce conformational changes in DOCK5•ELMO1.
- These conformational changes are critical for regulating GEF activity and downstream signaling pathways.
Conclusions
- Acidic lipids play a key role in regulating DOCK5•ELMO1 GEF activity via membrane-induced conformational changes.
- The study provides insights into membrane-dependent regulation of DOCK proteins and signalosome assembly.
- The methodology can be applied to study other large, membrane-associated signaling complexes.
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