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. 1991 Jul;65(7):3681–3692. doi: 10.1128/jvi.65.7.3681-3692.1991

An Epstein-Barr virus protein associated with cell growth transformation interacts with a tyrosine kinase.

R Longnecker 1, B Druker 1, T M Roberts 1, E Kieff 1
PMCID: PMC241385  PMID: 1710288

Abstract

Epstein-Barr virus (EBV) encodes two integral membrane proteins in latently infected growth-transformed cells. One of these, LMP1, can transform rodent fibroblasts and induce markers of B-lymphocyte activation. The second, LMP2, colocalizes with LMP1 in a constitutive patch in the EBV-transformed B-lymphocyte plasma membrane. The experiments reported here demonstrate that LMP2 may biochemically interact with LMP1 and that LMP2 closely associates with and is an important substrate for a B-lymphocyte tyrosine kinase in EBV-transformed B lymphocytes or in B-lymphoma cells in which LMP2 is expressed by gene transfer. LMP2 is also serine and threonine phosphorylated. LMP2 localizes to a peripheral membrane (presumably plasma membrane) patch in transfected B-lymphoma cells and colocalizes with much of the cellular tyrosine-phosphorylated proteins. LMP2 undergoes tyrosine phosphorylation in anti-LMP2 or antiphosphotyrosine immunoprecipitates from transfected B-lymphoma cells or EBV-transformed B lymphocytes. The first 167 of the 497 amino acids of LMP2 retain full ability to associate with and act as a substrate for a tyrosine kinase. A 70-kDa phosphotyrosine cell protein associates with LMP2 in transfected cells or in EBV-transformed B lymphocytes and could be a mediator of the effects of LMP2.

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Selected References

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