Transcription activator–mediated chromatin remodeling. Transcription activators can remodel chromatin structure by mobilizing nucleosomes; nucleosome repositioning is influenced by histone modifications. Some transcription activators have HAT activity or recruit enzyme complexes such as SWI/SNF, accelerating the remodeling of chromatin by relocating nucleosomes near a promoter. This leads to recruitment of the transcription machinery to newly exposed promoters, stimulating transcription.