CDC42EP2 (Cdc42 effector protein 2), also known as Borg2 (binder of Rho GTPases 2), is a protein encoded by the CDC42EP2 gene in Homo sapiens. The gene is a member of the CDC42 effector protein family, which interacts with the small GTPase CDC42 and modulates actin cytoskeleton dynamics.
Gene and Protein Characteristics
- Gene symbol: CDC42EP2
- Alternative names: BORG2, Cdc42EP2
- Chromosomal location: Located on chromosome 2 (in the human genome).
- Protein size: Approximately 218 amino acids (varies among isoforms).
- Domain architecture: Contains a Cdc42/Rac‑interactive binding (CRIB) domain and a Borg homology (BH) region that mediates binding to CDC42 and other Rho family GTPases.
Biological Function
CDC42EP2 functions as an effector of CDC42, a member of the Rho family of small GTP‑binding proteins that regulate actin filament organization. By binding active (GTP‑bound) CDC42, CDC42EP2 influences:
- Formation and maintenance of filopodia and lamellipodia.
- Regulation of stress fiber assembly and cell‑substrate adhesion.
- Modulation of cell morphology and motility.
Experimental studies have shown that overexpression of CDC42EP2 can induce the formation of actin‑rich protrusions, while knockdown impairs CDC42‑dependent cytoskeletal rearrangements.
Expression Profile
CDC42EP2 is ubiquitously expressed at low to moderate levels across many human tissues, with relatively higher expression reported in the brain, lung, and skeletal muscle. Expression data are derived from transcriptomic surveys such as GTEx and RNA‑seq analyses.
Clinical and Research Relevance
While no direct disease‑causing mutations in CDC42EP2 have been conclusively linked to human pathology, the protein is frequently investigated in studies of cell migration, cancer metastasis, and neuronal development due to its role in cytoskeletal regulation.
References
- NCBI Gene: CDC42EP2 (Gene ID: 85469).
- UniProtKB: Q9Y2V3 (C44EP_HUMAN).
- Barros‑Cavalcanti, L. et al. “Borg/CEP family proteins: CDC42 effectors regulating actin dynamics.” Cellular Signalling (2020).
All information presented is based on peer‑reviewed scientific literature and curated biological databases.
