| Popis: |
A nuclear power source in the cell DNA is packaged onto nucleosomes, the principal component of chromatin. This chromatin must be remodeled to allow gene transcription, DNA replication, and DNA repair machineries access to the enclosed DNA. Chromatin-remodeling complexes require high levels of cellular energy to do their job. Wright et al. show that the energy needed to remodel chromatin can be derived from a source, poly-ADP-ribose, in the cell nucleus, rather than by diffusion of ATP from mitochondria in the cytoplasm, the usual powerhouse of the cell. Poly-ADP-ribose is converted to ADP-ribose and then to ATP, which can be used to fuel chromatin remodeling within the nucleus. Science , this issue p. 1221 |
