호모 사피엔스 종의 단백질 코드 유전자
소형 헤테로디머 파트너(SHP)는 NR0B2(핵수용체 서브패밀리 0, 그룹 B, 멤버 2)라고도 알려져 있으며, NR0B2 [5] 유전자에 의해 인체 내에서 암호화되는 단백질 이다.SHP는 세포내 전사인자 의 [6] 핵수용체 패밀리의 구성원이다. SHP는 DNA 결합 도메인이 없다는 점에서 핵 수용체로는 이례적이다. 따라서 기술적으로 전사인자도 핵수용체도 아니지만 다른 핵수용체 패밀리와의 배열 상동성이 상대적 으로 높기 때문에 여전히 전사인자로 분류된다.
기능. SHP의 주요 역할은 비생산적 헤테로디머를 [7] 생성하기 위한 결합을 통한 다른 핵 수용체의 억제인 것으로 보인다. 단백질은 또한 대사 주기 시계의 매개 인자로 확인되었습니다. 연구 결과 단백질은 레티노이드 및 갑상선 호르몬 수용체와 상호작용하여 그들의 배위자 의존적 전사 활성화를 억제하는 것으로 나타났습니다. 또한 에스트로겐 수용체와의 상호작용이 증명되어 기능저해로 이어지고 있다. 연구에 따르면 단백질은 두 가지 단계를 통해 핵호르몬 수용체 매개 트랜스 활성화 를 억제한다. 즉, 공동활성화제와의 경쟁과 전사억제제 기능의 [5] 직접적인 영향이다.
구조 및 배위자 EID1과의 공결정화에 의해 생성된 LBD 전용 SHP의 결정구조를 얻을 수 있다. 일반적인 AF-2 부위에 결합하는 대신, EID1은 LBD의 보통 나선형 α1 대신 채워져 SHP를 더 용해시킨다. 전체적인 구조는 다른 LBD의 apo (리간드리스) 형태와 유사합니다. 일부 합성 레티노이드 배위자는 SHP의 LBD에 결합할 수 있으며 AF-2 [9] 부위를 사용하여 LXLL 함유 코어프레서와의 상호작용을 촉진할 수 있다.
상호 작용 NR 문헌의 텍스트 마이닝뿐만 아니라 대규모 및 중규모 Y2H 실험은 핵 수용체 이량화 네트워크에서 SHP의 중요한 역할과 다른 NR에 비해 상대적으로 높은 연결 상태를 부각시켰다. [10]
소규모 헤테로다이머 파트너는 다음과 상호작용하는 것 으로 나타났습니다.
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(1) 기본 도메인
(1.1 ) 베이직 류신 지퍼(bZIP )(1.2) 기본나선-루프-나선 (bHLH )
그룹 A 그룹 B 그룹 C bHLH-PAS 그룹 D 그룹 E 그룹 F bHLH-COE
(1.3) bHLH-ZIP (1.4) NF-1 (1.5) RF-X (1.6) 기본나선경간나선(bHSH)
(2.1) 핵수용체 (CYS4 )
서브패밀리 1 서브패밀리 2 서브 패밀리 3 서브패밀리 4 서브패밀리 5 서브패밀리 6 서브패밀리 0
(2.2) 기타 CY4 (2.3) Cys2 His2 (2.4) Cys6 (2.5) 교대 조성 (2.6) WRKY