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VHL type 2B mutations retain VBC complex form and function.

Kathryn E Hacker1, Caroline Martz Lee, W Kimryn Rathmell

  • 1Department of Medicine, Curriculum in Genetics and Molecular Biology, Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Durham, North Carolina, United States of America.

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von Hippel-Lindau (VHL) disease mutations partially regulate hypoxia-inducible factors (HIF) through a remnant VBC complex. This explains varying cancer predisposition in VHL disease.

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Area of Science:

  • Oncology
  • Genetics
  • Molecular Biology

Background:

  • von Hippel-Lindau (VHL) disease is a genetic disorder associated with various hypervascular tumors.
  • VHL loss leads to the dysregulation of hypoxia-inducible factors (HIFs), crucial in VHL disease-associated renal tumorigenesis.
  • Gradations in HIF dysregulation correlate with disease predisposition and severity.

Purpose of the Study:

  • To investigate how specific VHL missense mutations affect VBC complex assembly.
  • To determine the impact of these mutations on HIF ubiquitylation and regulation.
  • To elucidate the mechanism behind varying cancer risks in VHL disease.

Main Methods:

  • Examined VHL missense mutations' ability to form the VBC complex.
  • Analyzed the ubiquitylation of HIF-1alpha by mutant VHL proteins.
  • Assessed interactions between pVHL, Elongin C, ROC1, and Cullin-2.

Main Results:

  • VHL Type 2B mutations partially disrupt pVHL and Elongin C interaction but maintain partial HIF regulation.
  • Mutant pVHL in Type 2B forms a remnant VBC complex with ROC1 and Cullin-2.
  • This remnant complex retains the capacity to ubiquitylate HIF-1alpha.

Conclusions:

  • VHL mutation subtypes facilitate intermediate HIF regulation via a remnant VBC complex.
  • This provides a molecular mechanism for graded HIF dysregulation in VHL disease.
  • Findings explain the varying genetic predisposition to cancer observed in VHL disease patients.