X-연결 아포토시스 억제제(XIAP; MIM 300079)는 IAP 계열의 유력한 구성원이다.이 패밀리의 모든 구성원은 카스파아제(예: CASP3; MIM 600636)와 결합하고 억제하는 약 80개의 아미노산의 시스테인이 풍부한 바쿨로바이러스 IAP(BIR) 반복 도메인을 가지고 있다.XIAP에는 3개의 BIR 도메인과 E3 유비퀴틴 리가아제(MIM 601623 참조) 활성을 가진 C-말단 RING 아연 핑거가 있습니다.XAF1은 XIAP의 항아스피아제 활성을 길들이고 암세포에서 아포토시스 내성을 매개하는 데 중요할 수 있다(Liston 등, 2001).[OMIM [7]제공]
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