BCL7 proteins, metazoan-specific subunits of the mammalian SWI/SNF complex, bind the nucleosome core particle
Diaz, D.; Kazrani, A. A.; Martin, F.; Lafouge, J.; Siebert, S.; Birck, C.; Blais, A.; Bergamin, E.
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BCL7 proteins are among the most recently identified subunits of the mammalian SWI/SNF (mSWI/SNF) chromatin remodeling complex and are absent from the unicellular version of the complex. Mutations in BCL7 proteins are associated with different kind of cancers including blood malignancies. The information on the molecular function and on the structure of BCL7 proteins is to date very limited. Here we report that BCL7 proteins directly bind the nucleosome core particle (NCP) and free DNA with high affinity. We demonstrate that BCL7 proteins form defined complexes with the NCP and we identify the conserved N-terminal part of BCL7 proteins as sufficient to nucleosome binding. We further characterize the impact of BCL7 protein mutations reported in cancer patients on NCP binding and show that the R11S driver mutation reduces the affinity for the nucleosome. Our findings clarify the molecular function of BCL7 proteins and help rationalize the impact of cancer-associated mutations.
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