The flexible loop of Bcl-2 is required for molecular interaction with immunosuppressant FK-506 binding protein 38 (FKBP38)
Kang, Cong Bao
Yoon, Ho Sup
Date of Issue2005
School of Biological Sciences
Bcl-2 contains an unusually long loop between the first and the second helices. This loop has been shown to be highly flexible based on NMR and X-ray crystallographic analyses of this region. Bcl-2 is regulated at the posttranslational level through phosphorylation of specific residues within the flexible loop. The biological role and posttranslational modifications of the loop of Bcl-2 is currently unclear. FK-506 binding protein 38 (FKBP38) has been reported to interact with Bcl-2, suggesting that FKBP38 could act as a docking molecule to localize Bcl-2 at the mitochondrial membrane [Shirane, M. and Nakayama, K.I. (2003) Inherent calcineurin inhibitor FKBP38 targets Bcl-2 to mitochondria and inhibits apoptosis. Nat. Cell Biol. 5, 28-37]. Here, we investigated the molecular interaction between FKBP38 and Bcl-2, and demonstrated that Bcl-2 interacts with FKBP38 through the unstructured loop, and the interaction appears to regulate phosphorylation in the loop of Bcl-2.
© 2005 Federation of Europian Biochemical Societies. This is the author created version of a work that has been peer reviewed and accepted for publication in FEBS Letters, published by Elsevier B.V. on behalf of Federation of Europian Biochemical Societies. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1016/j.febslet.2005.01.053].