GEF H1 Recombinant Rabbit mAb (S-6057)

GEF-H1 (Guanine nucleotide exchange factor H1), encoded by the gene ARHGEF2, is a functionally critical Rho guanine nucleotide exchange factor (RhoGEF) whose core function is to catalyze the conversion of the small GTPase RhoA from an inactive GDP-bound state to an active GTP-bound state, thereby activating downstream signaling pathways that regulate actin cytoskeleton reorganization and a variety of cellular functions. Its activity is subject to complex regulation: on one hand, its protein structure contains typical domains such as DH (Dbl homology) and PH (pleckstrin homology), conferring catalytic activity and membrane localization capabilities; on the other hand, it can bind to microtubules, and upon microtubule depolymerization, GEF-H1 is released from microtubules and activated, thereby tightly coupling dynamic changes in the cytoskeleton to the switching of RhoA signaling pathways. In terms of physiological functions, GEF-H1 participates in regulating cell morphology, cell division, immune responses, and synaptic plasticity in neurons—for example, in neurons, it serves as a component of the AMPA receptor complex and negatively regulates dendritic spine development through RhoA signaling cascades. However, its functional dysregulation is also closely associated with various pathological conditions, such as hyperactivation of the GEF-H1/RhoA pathway observed in kidney diseases, and its involvement in regulating NF-κB activity and the production of inflammatory cytokines (such as IL-6 and TNF) also suggests its potential role in inflammatory diseases.