T-cell lymphoma invasion and metastasis-inducing protein 1–Ras-related C3 botulinum toxin substrate 1 interaction (Tiam1–Rac1 interaction)

The T-cell lymphoma invasion and metastasis-inducing protein 1–Ras-related C3 botulinum toxin substrate 1 (Tiam1–Rac1) interaction is a critical regulatory node in cellular signaling, where Tiam1 acts as a guanine nucleotide exchange factor (GEF) to activate the small GTPase Rac1 (Habets et al., 1994; Michiels et al., 1995). By facilitating the exchange of GDP for GTP, Tiam1 triggers Rac1-mediated actin cytoskeleton remodeling, which governs essential processes such as cell migration, adhesion, and polarity (Sander et al., 1998). In various malignancies, including breast, lung, and colorectal cancers, the Tiam1–Rac1 axis is frequently upregulated, driving tumor invasion, metastasis, and resistance to chemotherapy (Marei and Malliri, 2017). Beyond oncology, this interaction plays significant roles in neuronal development, immune cell trafficking, and vascular integrity (Arimura and Kaibuchi, 2007). Therapeutic targeting of this protein-protein interaction aims to disrupt the binding interface using small molecules like NSC23766 or inhibitory peptides to prevent aberrant Rac1 activation (Gao et al., 2004). However, achieving high specificity remains a challenge due to the structural similarity among Rho-family GTPases and the diverse physiological roles of Rac1 in normal tissue homeostasis.

Other names

Tiam1-Rac1 complexTiam1-Rac1 signaling moduleTiam1-Rac1 protein-protein interactionTiam1-Rac1 PPI

Inhibition of protein-protein interaction (PPI) to prevent the guanine nucleotide exchange factor (GEF) Tiam1 from activating the small GTPase Rac1.