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GABAA receptor-associated protein (GABARAP) induces apoptosis by interacting with DEAD (Asp-Glu-Ala-Asp/His) box polypeptide 47 (DDX 47)

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Abstract

GABAA receptor-associated protein (GABARAP) is a 14-kDa cytoplasmic protein initially identified as a molecular chaperone for GABAA receptor in cortical neurons. However, evidence indicates that the function of GABARAP is much broader than a specific role in neuronal cells. As an initial step to define the biological role of GABARAP, we searched for binding partners of GABARAP using co-immunoprecipitation coupled with LC-MS/MS analysis. As a result, DEAD (Asp-Glu-Ala-Asp/His) box polypeptide 47 (DDX 47), recently identified as RNA helicase, is identified as a binding partner of GABARAP. An interaction between GABARAP and DDX 47 was further confirmed by yeast two-hybrid systems. Further, co-transfection of GABARAP and DDX47 cDNA into a tumor cell line induces apoptosis. This result may be the first evidence showing that GABARAP and DDX 47 are involved in the apoptotic process.

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Acknowledgement

This work was supported by the research fund of Hanyang University (HY-2004-S).

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Correspondence to Taehoon Chun.

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Lee, J.H., Rho, S.B. & Chun, T. GABAA receptor-associated protein (GABARAP) induces apoptosis by interacting with DEAD (Asp-Glu-Ala-Asp/His) box polypeptide 47 (DDX 47). Biotechnol Lett 27, 623–628 (2005). https://doi.org/10.1007/s10529-005-3628-2

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  • DOI: https://doi.org/10.1007/s10529-005-3628-2

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