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Updated: Apr 27, 2026

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Published on: December 31, 2014
Sin3b interacts with Myc and decreases Myc levels
Pablo Garcia-Sanz1, Andrea Quintanilla2, M Carmen Lafita2
1From the Instituto de Biomedicina y Biotecnología de Cantabria (IBBTEC), Consejo Superior de Investigaciones Científicas, Universidad de Cantabria, Sociedad para el Desarrollo de Cantabria and the Departamento de Biología Molecular, Universidad de Cantabria, Santander 39011, Spain, the Instituto de Investigaciones Biomédicas Alberto Sols, Consejo Superior de Investigaciones Científicas, Instituto de Investigación Hospital Universitario La Paz (IdiPaz), Facultad de Medicina, Universidad Autónoma de Madrid, 28046 Madrid, Spain, the Fundación M. D. Anderson Internacional, Madrid, Spain.
The transcriptional repressor Sin3b interacts with Myc protein, decreasing Myc levels through deacetylation and repression. Low Sin3b expression correlates with cancer progression, suggesting Sin3b limits Myc activity.
Area of Science:
- Molecular Biology
- Cancer Biology
- Epigenetics
Background:
- Myc expression is frequently altered in human cancers.
- Sin3b is a transcriptional repressor involved in gene regulation.
Purpose of the Study:
- To investigate the interaction between Sin3b and Myc.
- To elucidate the functional consequences of this interaction in cancer.
Main Methods:
- Yeast two-hybrid screening
- Co-immunoprecipitation
- Immunofluorescence
- Proximity ligation assay
- Chromatin immunoprecipitation
- Sin3b silencing and overexpression studies
Main Results:
- Sin3b directly interacts with Myc in a Max-independent manner.
- Histone deacetylase 1 (HDAC1) is recruited to Myc-Sin3b complexes, and its activity is crucial.
- Sin3b silencing increases Myc levels, while Sin3b overexpression leads to Myc deacetylation and degradation.
- Low Sin3b expression in breast tumors is associated with disease progression.
Conclusions:
- Sin3b limits Myc activity by promoting Myc deacetylation and degradation.
- Sin3b functions through both Mxd-dependent repression and direct reduction of Myc levels.
- Sin3b acts as a tumor suppressor by negatively regulating Myc.
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