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Rap guanine nucleotide exchange factor 6 (RAPGEF6)
- Target
- RAPGEF6
- Molecular classification
- Enzyme, Guanine nucleotide exchange factor (GEF), Ras/Rap-associating domain-containing protein, PDZ domain-containing protein
01
Overview
Rap guanine nucleotide exchange factor 6 (RAPGEF6) is an enzyme belonging to the family of guanine nucleotide exchange factors (GEFs) that specifically activate small GTPases in the Rap1A, Rap2A, and M-Ras families[2][3]. It contains PDZ and Ras/Rap-associating domains, and is primarily responsible for activating Rap1 GTPases by facilitating the exchange of GDP for GTP on these proteins[1][2]. RAPGEF6 is crucial for regulating cell adhesion, migration, and polarity through its downstream signaling on Rap1, and it plays a vital role in neural progenitor development, maintenance of adherens junctions, and proper formation of the cerebral cortex in mammals[1]. Disruption of RAPGEF6 function leads to abnormalities in neocortical development, including defective cell adhesion structures and impaired neural progenitor organization[1].
- Other names
- PDZGEF2PDZ-GEF2RA-GEF-2KIA001LBRAGEF2PDZ domain-containing guanine nucleotide exchange factor 2PDZ domain containing guanine nucleotide exchange factor (GEF) 2PDZ domain-containing guanine nucleotide exchange factor I
02
Biological functions
Regulation of small GTPase-mediated signal transductionActivation of Rap1A, Rap2A, and M-Ras GTPasesMicrovillus assemblyPositive regulation of GTPase activityProtein localization to plasma membraneMaintenance of apical surface adherens junctions in neural progenitorsNeural progenitor development
03
Disease associations
Neurodevelopmental disorders (e.g., disruption of Rapgef6 related to neural progenitor disorganization and ectopic cortical mass formation)Potential roles in cancer (as GEFs can be involved in oncogenic signaling, but direct links to cancer are not strongly established in current literature)
04
Safety considerations
Disruption of RAPGEF6 function—genetic knockout—leads to neural development abnormalities, notably impaired migration and organization of neural progenitors[1].Safety concerns for therapeutic targeting are undetermined; loss-of-function animal models suggest developmental neurotoxicity risk[1].
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