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The Inhibitory Effect of Apolipoprotein B mRNA-Editing Enzyme Catalytic Polypeptide-Like 3G (APOBEC3G) and Its Family Members on the Activity of Cellular MicroRNAs

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miRNA Regulation of the Translational Machinery

Part of the book series: Progress in Molecular and Subcellular Biology ((PMSB,volume 50))

Abstract

The apolipoprotein B mRNA-editing enzyme catalytic polypeptide-like 3G (APOBEC3G or APOBEC3G) and its fellow cytidine deaminase family members are potent restrictive factors for human immunodeficiency virus type 1 (HIV-1) and many other retroviruses. However, the cellular function of APOBEC3G remains to be further clarified. It has been reported that APOBEC3s can restrict the mobility of endogenous retroviruses and LTR-retrotransposons, suggesting that they can maintain stability in host genomes. However, APOBEC3G is normally cytoplasmic. Further studies have demonstrated that it is associated with an RNase-sensitive high molecular mass (HMM) and located in processing bodies (P-bodies) of replicating T-cells, indicating that the major cellular function of APOBEC3G seems to be related to P-body-related RNA processing and metabolism. As the function of P-body is closely related to miRNA activity, APOBEC3G could affect the miRNA function. Recent studies have demonstrated that APOBEC3G and its family members counteract miRNA-mediated repression of protein translation. Further, APOBEC3G enhances the association of miRNA-targeted mRNA with polysomes, and facilitates the dissociation of miRNA-targeted mRNA from P-bodies. As such, APOBEC3G regulate the activity of cellular miRNAs. Whether this function is related to its potent antiviral activity remains to be further determined.

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Acknowledgments

This work was supported in part by NIH grants AI058798 and AI052732 to H.Z.

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  1. Center for Human Virology, Thomas Jefferson University, 809 Curtis Building, 1015 Walnut Street, Philadelphia, PA, 19107, USA

    Hui Zhang

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  1. Health Science Center, Dept. Biochemistry & Molecular Biology, Louisiana State University, Kings Highway 1501, Shreveport, 71130-3932, Louisiana, USA

    Robert E. Rhoads

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Zhang, H. (2010). The Inhibitory Effect of Apolipoprotein B mRNA-Editing Enzyme Catalytic Polypeptide-Like 3G (APOBEC3G) and Its Family Members on the Activity of Cellular MicroRNAs. In: Rhoads, R. (eds) miRNA Regulation of the Translational Machinery. Progress in Molecular and Subcellular Biology(), vol 50. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-03103-8_5

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