BAG-1--a nucleotide exchange factor of Hsc70 with multiple cellular functions.
BAG-1 (Bcl-2-associated athanogene) is a multifaceted protein implicated in the modulation of a large variety of cellular processes. Elucidating the molecular mechanisms that underlie the cellular functions of BAG-1 becomes an increasingly important task, particularly in light of the growing evidence connecting aberrant BAG-1 expression to certain human cancers. A common element of the remarkable functional diversity of BAG-1 appears to be the interaction with molecular chaperones of the Hsp70 family. In fact, BAG-1 functions as a nucleotide exchange factor of mammalian cytosolic Hsc70, thereby triggering substrate unloading from the chaperone. In addition, recent findings reveal an association of BAG-1 with the proteasome, which suggests a role in coordinating chaperone and degradation pathways.
Institut für Zellbiologie und Bonner Forum Biomedizin, Rheinische Friedrich-Wilhelms-Universität Bonn, Ulrich-Haberland-Str. 61a, D-53121 Bonn, Germany.
Simon
S
Alberti
Claudia
C
Esser
Jörg
J
Höhfeld
D000818:Animals; D003546:Cysteine Endopeptidases / Q000378:metabolism; D004268:DNA-Binding Proteins; D050883:HSC70 Heat-Shock Proteins; D018840:HSP70 Heat-Shock Proteins / Q000378:metabolism*; D006801:Humans; D008565:Membrane Proteins / Q000378:metabolism / Q000502:physiology*; D009097:Multienzyme Complexes / Q000378:metabolism; D046988:Proteasome Endopeptidase Complex; D011487:Protein Conformation; D014157:Transcription Factors; D025801:Ubiquitin / Q000378:metabolism
C091732:BCL2-associated athanogene 1 protein; D004268:DNA-Binding Proteins; D050883:HSC70 Heat-Shock Proteins; D018840:HSP70 Heat-Shock Proteins; C494371:HSPA8 protein, human; D008565:Membrane Proteins; D009097:Multienzyme Complexes; D014157:Transcription Factors; D025801:Ubiquitin; D003546:Cysteine Endopeptidases; D046988:Proteasome Endopeptidase Complex