Epstein-Barr virus latent membrane protein 1 mediates serine 25 phosphorylation and nuclear entry of annexin A2 via PI-PLC-PKCalpha/PKCbeta pathway

Molecular Carcinogenesis
Wei LuoYa Cao

Abstract

We have previously elucidated that Epstein-Barr-virus-encoded latent membrane protein 1 (LMP1) can increase the serine phosphorylation level of annexin A2 by activating the protein kinase C (PKC) signaling pathway and that LMP1 induces the nuclear entry of annexin A2 in an energy- and temperature-dependent manner. Here, we further confirm that LMP1 increases the serine phosphorylation level of annexin A2 by activating the phosphoinositide-specific phospholipase C (PI-PLC)-PKC alpha/PKC beta pathway, mainly through the activation of the PKCbeta pathway. Additionally, active recombinant PKC alpha, PKC beta I, and PKC beta II kinases are able to phosphorylate annexin A2 in vitro. Annexin A2 in the nucleus plays an important role in DNA synthesis and cell proliferation. By site-specific substitution of glutamic acid in the place of serine 11 and 25 in the N-terminus, we show that serine 25 phosphorylation of annexin A2 was associated with the nuclear entry of annexin A2, DNA synthesis and cell proliferation, whereas serine 11 has no obvious influence. We demonstrate for the first time that the PI-PLC-PKCalpha/PKCbeta pathway plays an important role in serine phosphorylation and in the nuclear entry of annexin A2 mediated by LMP1. I...Continue Reading

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