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Molecular Characterization of the von Hippel-Lindau Ubiquitin Ligase

저자: Ohh, Michael; Sufan, Roxana Ioana
출판사: 2009-11 2011-03-08T17:23:04Z WITHHELD_ONE_YEAR 2011-03-08T17:23:04Z 2011-03-08T17:23:04Z
논문: Thesis / Dissertation ETD
판/형식:   주제/주장 : 눈문/학위논문 : 전자도서
데이터베이스:WorldCat
요약:
Marking proteins for degradation by the proteasome is a classical function of ubiquitination. This process of covalent attachment of a chain of ubiquitin molecules to target proteins is governed by the ubiquitin-activating enzyme (E1), the ubiquitin-conjugating enzyme (E2) and the ubiquitin ligase (E3). The von Hippel-Lindau (VHL) tumour suppressor protein forms an E3 ubiquitin ligase, ECV (Elongins BC/Cul2/VHL),  더 읽기…
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장르/형태: Thesis
자료 유형: 눈문/학위논문, 인터넷 자료
문서 형식: 인터넷 자원
모든 저자 / 참여자: Ohh, Michael; Sufan, Roxana Ioana
OCLC 번호: 721252520
언어 메모: en_ca

초록:

Marking proteins for degradation by the proteasome is a classical function of ubiquitination. This process of covalent attachment of a chain of ubiquitin molecules to target proteins is governed by the ubiquitin-activating enzyme (E1), the ubiquitin-conjugating enzyme (E2) and the ubiquitin ligase (E3). The von Hippel-Lindau (VHL) tumour suppressor protein forms an E3 ubiquitin ligase, ECV (Elongins BC/Cul2/VHL), which targets the alpha subunit of hypoxia-inducible factor (HIF) for ubiquitin-mediated destruction under normal oxygen tension. Tumour hypoxia promotes accumulation of HIFalpha, whose expression is associated with cancer progression, poor prognosis and resistance to conventional therapies, thus establishing HIF as a therapeutic target. Notably, VHL is functionally inactivated in VHL disease, a hereditary cancer syndrome characterized by the formation of tumours in multiple organs, as well as in the majority of sporadic clear-cell renal cell carcinomas (CCRCC) and haemangioblastomas. Recently, certain VHL mutations have been shown to cause the congenital disorder Chuvash polycythemia. Work contained in this thesis describes the temporally coordinated activation of the ECV, whereby oxygen-dependent recognition of HIFalpha by VHL triggers Cul2 modification by the ubiquitin-like molecule NEDD8, which enhances ECV ubiquitin ligase activity by recruiting the E2. In addition, the feasibility of 'bio-tailored' enzymes in the treatment of cancer is introduced by creating a bioengineered VHL capable of targeting HIFalpha for degradation irrespective of oxygen tension, which leads to the dramatic inhibition of CCRCC tumour growth and angiogenesis in a xenograft model. Furthermore, a ubiquitin ligase composed of two F-box proteins, VHL and suppressor of cytokine signalling 1 (SOCS1), was identified and shown to be paramount for the negative regulation of erythropoiesis by targeting phosphorylated Janus kinase 2 (JAK2) for ubiquitin-mediated destruction. The malfuncti

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