BAG family molecular chaperone regulator 5 (BAG5)

BAG family molecular chaperone regulator 5 (BAG5) is a unique co-chaperone protein of the BAG family, characterized by five tandem BAG domains. BAG5 interacts with the ATPase domain of HSP70/HSC70, acting as a nucleotide exchange factor that enhances protein folding and quality control in cells[2][4][5]. It is especially crucial for proteostasis within junctional membrane complexes (JMCs) in cardiomyocytes, where it ensures proper calcium handling and structural stability[1]. Loss-of-function BAG5 mutations have been shown to cause inherited dilated cardiomyopathy, with disruptions in calcium homeostasis, T-tubule architecture, and increased susceptibility to arrhythmias[1]. BAG5 also interacts with other proteins involved in neuroprotection and mitophagy, making it relevant to neurodegenerative disease mechanisms[4]. There are experimental indications that BAG5 may be a viable target for gene therapy in DCM and possibly other diseases associated with cell stress and protein misfolding[1][4][5].

Other names

BAG5BAG cochaperone 5KIAA0873BAG-5Bcl-2-associated athanogene 5CMD2FBCL2 associated athanogene 5bcl-2-associated athanogene 5

Gene replacement therapy; Modulation of chaperone activity