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What's in the 'BAG'?--A functional domain analysis of the BAG-family proteins.

Bcl-2-associated athanogene (BAG)-family proteins are BAG domain-containing proteins that interact with the heat shock proteins 70, both constitutive Hsc70 and inducible Hsp70. BAG-family proteins bind through the BAG domain to the ATPase domain of Hsc70/Hsp70. The BAG domain, approximately 110 amino acids in length, is a conserved region at the carboxyl terminus and consists of three anti-parallel alpha helices based on X-ray crystallography and NMR studies. The second and third alpha-helices of the BAG domain interact with the ATP-binding pocket of Hsc70/Hsp70. Currently, six human BAG proteins have been reported, four of which have been shown to functionally bind Hsc70/Hsp70. BAG-family proteins regulate chaperone protein activities through their interaction with Hsc70/Hsp70. Over-expression of BAG-family proteins is found in several cancers and has been demonstrated in the laboratory to enhance cell survival and proliferation. The anti-apoptotic activities of BAG-family proteins may be dependent on their interactions with Hsc70/Hsp70 and/or binding to Bcl-2. Both BAG-1 and BAG-3/CAIR-1 interact with Bcl-2 and have been shown to have a supra-additive anti-apoptotic effect with Bcl-2. Several N-terminal domains or motifs have been identified in BAG-family proteins as well. These domains enable BAG-family proteins to partner with other proteins and potentially alter the activity of those target proteins by recruiting Hsc70/Hsp70. BAG-family proteins participate in a wide variety of cellular processes including cell survival (stress response), proliferation, migration and apoptosis.[1]

References

  1. What's in the 'BAG'?--A functional domain analysis of the BAG-family proteins. Doong, H., Vrailas, A., Kohn, E.C. Cancer Lett. (2002) [Pubmed]
 
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