PAK3（p21 (RAC1) activated kinase 3），癌症关联基因，基因ID：5063，该基因编码的蛋白是一种丝氨酸苏氨酸激酶，与gtp结合的ras样蛋白（p21）、cdc2和rac1形成激活复合物。这种蛋白可能是树突状细胞发育和树突状棘内与突触可塑性相关的快速细胞骨架重组所必需的。这个基因的缺陷是导致非综合征性x连锁智力残疾的原因。另外，还发现了编码不同亚型的剪接转录变体。[由RefSeq提供，2017年7月]The protein encoded by this gene is a serine-threonine kinase and forms an activated complex with GTP-bound RAS-like (P21)， CDC2 and RAC1. This protein may be necessary for dendritic development and for the rapid cytoskeletal reorganization in dendritic spines associated with synaptic plasticity. Defects in this gene are the cause of a non-syndromic form of X-linked intellectual disability. Alternatively spliced transcript variants encoding different isoforms have been identified. [provided by RefSeq， Jul 2017]。