ヒトのSTK3の単量体は56,301 Daで、N末端のキナーゼドメイン、阻害ドメイン、そしてSARAHドメインの3つのドメインから構成される。C末端のSARAHドメインは長いαヘリックスから構成され、二量体化した際には逆平行型コイルドコイルを形成する。SARAHドメインはSTK3とRASSF(Ras association domain family)タンパク質やSAV1(英語版)との相互作用を媒介することが示されている。RASSFはアポトーシスの活性化に重要な役割を果たしているがん抑制因子であり、SAV1はSTK3をアポトーシス経路と関連づけている。STK3が活性化状態となった際には、180番のスレオニン残基が自己リン酸化される。
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