Probable helicase-like transcription factor involved in transcriptional gene silencing. Associates with SUVR2 and contributes to transcriptional gene silencing at RNA-directed DNA methylation (RdDM) target loci but also at RdDM-independent target loci. May be involved in nucleosome positioning to form ordered nucleosome arrays on chromatin (PubMed:25420628). Associates with SUVR2 and functions redundantly with FRG1. Required for the efficient methylation of a broad range of RdDM target loci (PubMed:25425661). Interacts with SUVR2. Belongs to the SNF2/RAD54 helicase family. RAD16 subfamily.