PAK1 Protein, Human (His-SUMO)

PAK1, a dynamic protein kinase, intricately participates in diverse intracellular signaling pathways downstream of integrins and receptor-type kinases. Its multifaceted roles encompass crucial involvement in cytoskeleton dynamics, cell adhesion, migration, proliferation, apoptosis, mitosis, and vesicle-mediated transport processes. Demonstrating versatility, PAK1 directly phosphorylates BAD, providing cellular protection against apoptosis. Activation is achieved through interaction with CDC42 and RAC1, establishing its position as a GTPase effector that bridges Rho-related GTPases to the JNK MAP kinase pathway. PAK1's reach extends to the phosphorylation and activation of MAP2K1, orchestrating downstream MAP kinase activation. In addition to steering the reorganization of the actin cytoskeleton, actin stress fibers, and focal adhesion complexes, PAK1 also influences tubulin chaperone TBCB, impacting microtubule biogenesis and organization. Noteworthy roles include regulation of insulin secretion in response to elevated glucose levels, participation in the neuromuscular junction formation, and inhibition of activity during apoptosis. PAK1's vast repertoire extends to phosphorylating RAF1, SNAI1, MYL9/MLC2, and contributing to various cellular functions, such as chemokine uptake, synaptic stability, dendritic spine formation, and microtubule nucleation. Its involvement in mediating gastric cancer cell migration, response to DNA damage, and facilitation of stress granules underscore the complexity of PAK1's cellular impact.