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Inhibition of transcription elongation by the VHL tumor suppressor protein
D R Duan1, A Pause, W H Burgess
1Urologic Oncology Section, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA.
Abstract:
Germline mutations in the von Hippel-Lindau tumor suppressor gene (VHL) predispose individuals to a variety of tumors, including renal carcinoma, hemangioblastoma of the central nervous system, and pheochromocytoma. Here, a cellular transcription factor, Elongin (SIII), is identified as a functional target of the VHL protein. Elongin (SIII) is a heterotrimer consisting of a transcriptionally active subunit (A) and two regulatory subunits (B and C) that activate transcription elongation by RNA polymerase II. The VHL protein was shown to bind tightly and specifically to the Elongin B and C subunits and to inhibit Elongin (SIII) transcriptional activity in vitro. These findings reveal a potentially important transcriptional regulatory network in which the VHL protein may play a key role.
Insights
The von Hippel-Lindau (VHL) protein targets the Elongin (SIII) transcription factor. VHL binds Elongin B and C subunits, inhibiting its activity and revealing a key transcriptional regulatory network.
Area of Science:
- Molecular Biology
- Cancer Genetics
- Gene Regulation
Background:
- Germline mutations in the von Hippel-Lindau tumor suppressor gene (VHL) are linked to various cancers.
- The VHL protein's role in tumor suppression is not fully understood.
- Understanding VHL's molecular interactions is crucial for cancer research.
Purpose of the Study:
- To identify functional targets of the VHL protein.
- To investigate the interaction between VHL and cellular transcription factors.
- To elucidate the role of VHL in transcriptional regulation.
Main Methods:
- In vitro binding assays to study protein interactions.
- Functional assays to assess transcriptional activity.
- Identification of Elongin (SIII) as a VHL target.
Main Results:
- The VHL protein specifically binds to the Elongin B and C subunits of Elongin (SIII).
- VHL binding inhibits the transcriptional elongation activity of Elongin (SIII).
- Elongin (SIII) is a functional target of the VHL protein.
Conclusions:
- The VHL protein plays a role in regulating transcription through its interaction with Elongin (SIII).
- This interaction reveals a novel transcriptional regulatory network involving VHL.
- Findings suggest VHL's broader involvement in cellular processes beyond tumor suppression.