NCOA3 식별자 별칭 NCOA3 , ACTR, AIB-1, AIB1, CAGH16, CTG26, KAT13B, RAC3, SRC-3, SRC3, TNRC14, TNRC16, TRAM-1, bHLHe42, pCIP, nuclear receptor coactivator 3외부 ID OMIM : 601937 MGI : 1276535 HomoloGene : 4764 GeneCard : NCOA3 직교체 종 인간 마우스 엔트레스 앙상블 유니프로트 RefSeq(mRNA) RefSeq(단백질) 위치(UCSC) Chr 20: 47.5 – 47.66Mb Chr 2: 165.99 – 166.07Mb PubMed 검색[3] [4] 위키다타
NCOA3 라고도 알려진 핵수용체 공동활성화기 3은 인간에서 NCOA3 유전자 에 의해 암호화된 단백질 이다.[5] [6] NCOA3는 '유방 1에서 증폭'(AIB1)이나 스테로이드 수용체 공동활성화제-3(SRC-3 ) 또는 갑상선 호르몬 수용체 활성제 1(TRAM-1)이라고도 불린다.
함수 NCOA3는 여러 개의 핵수용체 상호 작용 영역과 내인 히스톤 아세틸전달효소 활동을 포함하는 전사적 공동활성제 단백질이다. NCOA3는 리간드 활성 핵 수용체에 의해 DNA 촉진 현장에 채용된다. 다시, NCOA3는 히스톤 을 아틸레이트하여 다운스트림 DNA를 전사하기 쉽게 만든다. 따라서, NCOA3는 유전자 발현의 상향 조절에서 핵 수용체 를 지원한다.[7] [8]
임상적 유의성 PAX2 대 AIB-1 단백질 표현 비율은 유방암 치료 에서 타목시펜 의 효과를 예측할 수 있다.[9] [10]
몇 가지 분자 메커니즘은 내분비 치료 저항(그림에서 제외됨)에 NCOA3(AIB1)을 포함한다. 신호 경로 또는 돌연변이(즉, HER2/neu 과다압박, PIK3CA (PI3K)에서 돌연변이를 활성화하고, ERK 및/또는 PIK3의 지속적인 활성화를 유도하는 원종 제3종 tyrosine-단백질 kinase Src 등)의 돌연변이를 활성화하는 것. CA/AKT 키나제 경로는 한 손으로는 향상된 AIB1 전사적 공동 활성화 용량을, [11] 다른 한 손으로는 프로테아솜 의존적 AIB1 턴오버를 억제하여 AIB1 과다 억제를 초래한다.[12] 두 조건 모두에서 에스트로겐 수용체(ER) 복합형성의 평형은 전사적으로 활성하는 복합체 쪽으로 대체되어 타목시펜 이나 풀베스트런트 (선택적 에스트로겐 수용체 조절기 )와 같은 항에스트로겐성 약물에 의한 억제에 대항한다. 그 결과는 에스트로겐에 민감한 유전자 전사의 복원과 암의 진행 및/또는 재발 촉진이다.
특히 AIB1과 HER2/neu 의 동반성 과다압박으로 진단된 종양은 타목시펜요법으로 다른 모든 환자를 합친 것보다 결과가 더 나쁘다.[13] 또한 내분비 치료로 치료된 발진 유방암의 휴면 종양 세포는 키나제 신호 전달 경로를 변경하고 궁극적으로 AIB1 종양 기능을 강화하는 돌연변이를 시간이 지남에 따라 획득할 수 있다. 또한 에스트로겐 수용체-PAX2 복합체는 HER2/neu 발현을 억제하지만, PAX2 발현 상실로 인해 de novo HER2/neu 발현이 발생하여 내분비 치료 저항성이 생기고 재발할 수 있다.[14]
AIB1 의존적 항에스트로겐 치료 저항성 메커니즘
상호작용 핵수용체 공동활성화기 3은 다음과 상호작용 하는 것으로 나타났다.
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PDB 갤러리
1kbh : 핵수용체 공동활성화기 CBP와 ACTR의 상호작용에서의 상호 시너지 폴딩