title: Proteasomes: machines for all reasons.
abstract: Emerging data reveal that besides degrading proteins tagged with ubiquitin, the proteasome plays a more varied and decisive role in cellular regulation than previously imagined. In this issue, Hanna et al. (2007) expand our view of the proteasome by showing that under certain conditions, proteasome composition can be altered to control ubiquitin homeostasis.
authors.affiliation: Department of Physiology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390, USA. george.demartino@utsouthwestern.edu
authors.forename: George N
authors.initials: GN
authors.lastname: Demartino
authors.forename: Thomas G
authors.initials: TG
authors.lastname: Gillette
mesh_terms: D000818:Animals; D006706:Homeostasis / Q000502:physiology*; D006801:Humans; D046911:Macromolecular Substances / Q000378:metabolism; D046988:Proteasome Endopeptidase Complex / Q000378:metabolism* / Q000648:ultrastructure; D011485:Protein Binding / Q000502:physiology; D011506:Proteins / Q000378:metabolism*; D025801:Ubiquitin / Q000378:metabolism*; D043743:Ubiquitin-Protein Ligase Complexes / Q000378:metabolism
chemical_list: D046911:Macromolecular Substances; C085834:PA700 proteasome activator; D011506:Proteins; D025801:Ubiquitin; D043743:Ubiquitin-Protein Ligase Complexes; D046988:Proteasome Endopeptidase Complex