Guanine Nucleotide Exchange Factors in Membrane Dynamics

Guanine nucleotide exchange factors (GEFs) orchestrate the activation of small GTPases by catalysing the exchange of GDP for GTP, thereby triggering membrane remodelling events essential for vesicle formation, trafficking and organelle maintenance. Central to eukaryotic secretion and endocytic pathways are the Arf family of small GTPases, whose engagement with specific GEFs ensures spatial and temporal precision in membrane budding, coat recruitment and lipid‐modifying enzyme activation. GEFs are characterised by a conserved Sec7 catalytic domain often accompanied by modular regions that direct their localisation and regulate their activity in response to phosphorylation, lipid composition or protein–protein interactions. Through these mechanisms, GEFs integrate signalling inputs to control cell polarity, migration and division, with dysregulation linked to developmental disorders, immune dysfunction and cancer metastasis.

Research from Nature Portfolio

Recent studies have refined our understanding of how GEFs and their GTPase substrates interact at membranes. Nuclear magnetic resonance, neutron reflectometry and molecular dynamics simulations reveal that myristoylated Arf1 adopts a dynamic equilibrium between membrane‐proximal and distal conformations. This flexibility exposes distinct surfaces for effector engagement, explaining how a single GTPase can coordinate diverse trafficking steps. In parallel, detailed analysis of site-specific phosphorylation events in the N-terminal regions of the major Sec7 GEF GBF1 shows that distinct phospho-forms selectively influence its roles in Golgi homeostasis, secretion and cytokinesis. Differential regulation of GBF1 by phosphorylation underscores how post-translational modification of GEFs can partition their functions between secretory and cell division programmes.

Guanine Nucleotide Exchange Factors in Membrane Dynamics publication trend

The graph below shows the total number of articles in guanine nucleotide exchange factors in membrane dynamics across all publications each year (not limited to Nature Index journals).

Technical terms

Guanine nucleotide exchange factor (GEF): an enzyme that activates small GTPases by promoting exchange of GDP for GTP.

Sec7 domain: the conserved catalytic module within Arf GEFs responsible for nucleotide exchange.

Small GTPase: a molecular switch that cycles between inactive GDP-bound and active GTP-bound states to regulate membrane and trafficking events.

Pleckstrin homology (PH) domain: a lipid-binding region that targets proteins to specific membrane surfaces.

References

1. Myr-Arf1 conformational flexibility at the membrane surface sheds light on the interactions with ArfGAP ASAP1. Nature Communications (2023).
2. The small GTPase ARF3 controls invasion modality and metastasis by regulating N-cadherin levels. Journal of Cell Biology (2023).
3. Mapping the global interactome of the ARF family reveals spatial organization in cellular signaling pathways. Journal of Cell Science (2024).
4. The Arf-GEF GBF1 undergoes multi-domain structural shifts to activate Arf at the Golgi. Frontiers in Cell and Developmental Biology (2023).
5. Site-specific phosphorylations of the Arf activator GBF1 differentially regulate GBF1 function in Golgi homeostasis and secretion versus cytokinesis. Scientific Reports (2023).