Core histone-binding subunit that may target chromatin assembly factors, chromatin remodeling factors and histone deacetylases to their histone substrates in a manner that is regulated by nucleosomal DNA. Required for hcp-3 and his-1 stabilization, localization of hcp-3 to centromeres and for proper chromosome segregation. Synthetic multivulva class B (synMuvB) protein. SynMuvB proteins are required to repress the induction of vulval development by Ras signaling and probably act by forming the multiprotein DRM complex that represses transcription. Binds directly to helix 1 of the histone fold of histone H4, a region that is not accessible when H4 is in chromatin. Probable component of a NuRD-like complex, composed of at least lin-53 and hda-1. Interacts with lin-35. Interacts with hda-1; the interaction is direct. Component of the DRM complex, at least composed of lin-9, lin-35, lin-37, lin-52, lin-53, lin-54- dpl-1 and efl-1. Interacts with hcp-3. Localizes to centromeres during metaphase. Requires hcp-3 and knl-2 for nuclear and centromere localization. Belongs to the WD repeat RBAP46/RBAP48/MSI1 family.