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Functional impact of cancer-associated mutations in the tumor suppressor protein ING4
Alberto Moreno1, Alicia Palacios, Jose Luis Orgaz
1Instituto de Investigaciones Biomédicas Alberto Sols, Consejo Superior de Investigaciones Científicas-Universidad Autónoma de Madrid, Arturo Duperier 4, Madrid, Spain.
Abstract:
Inhibitor of growth 4 (ING4) is a member of the ING family of tumor suppressor proteins. In this study, we have analyzed the impact of two mutations in ING4 associated with human tumors (Y121N and N214D), testing their behavior in a series of functional, biochemical and structural analyses. We report that the N214D mutation dramatically dampened the ability of ING4 to inhibit proliferation, anchorage-independent growth or cell migration or to sensitize to cell death. In turn, the Y121N mutant did not differ significantly from wild-type ING4 in our assays. Neither of the mutations altered the normal subcellular localization of ING4, showing predominantly nuclear accumulation. We investigated the molecular basis of the defect in the activity of the N214D mutant. The folding and ability to bind histone marks of ING4 was not significantly altered by this mutation. Instead, we found that the functional impairment of the N214D mutant correlates with reduced protein stability due to increased proteasome-mediated degradation. In summary, our data demonstrates that a point mutation of ING4 associated to human tumors leads to the loss of several essential functions of ING4 pertinent to tumor protection and highlight the importance of ING4 function to prevent tumorigenesis.
Insights
A tumor suppressor protein, Inhibitor of growth 4 (ING4), loses function when mutated (N214D) in human cancers. This ING4 mutation increases protein degradation, hindering its tumor-protective roles.
Area of Science:
- Molecular biology
- Cancer research
- Protein biochemistry
Background:
- Inhibitor of growth 4 (ING4) is a key tumor suppressor protein.
- Mutations in ING4 are linked to human tumor development.
- Understanding ING4's function is crucial for cancer prevention.
Purpose of the Study:
- To analyze the functional and biochemical impact of two ING4 mutations (Y121N and N214D) found in human tumors.
- To investigate the molecular mechanisms underlying any observed functional defects.
- To determine the role of ING4 mutations in tumorigenesis.
Main Methods:
- Functional assays measuring cell proliferation, anchorage-independent growth, and cell migration.
- Biochemical analyses including protein stability and histone mark binding.
- Structural analyses of wild-type and mutant ING4 proteins.
- Subcellular localization studies using predominant nuclear accumulation.
Main Results:
- The N214D mutation significantly impaired ING4's ability to inhibit proliferation, growth, migration, and induce cell death.
- The Y121N mutation showed no significant difference compared to wild-type ING4.
- Neither mutation affected ING4's nuclear localization.
- The N214D mutation's functional loss correlated with reduced protein stability and increased proteasome-mediated degradation, not altered folding or histone binding.
Conclusions:
- The N214D mutation in ING4 leads to loss of essential tumor-suppressive functions.
- This mutation results in decreased ING4 protein stability, promoting its degradation.
- These findings underscore the importance of functional ING4 in preventing tumor formation.
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