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J. Biol. Chem., Vol. 277, Issue 13, 11423-11431, March 29, 2002

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An N-terminal Arginine-rich Cluster and a Proline-Alanine-Threonine Repeat Region Determine the Cellular Localization of the Herpes Simplex Virus Type 1 ICP34.5 Protein and Its Ligand, Protein Phosphatase 1^*

Hanwen Mao and Kenneth S. Rosenthal

From the Northeastern Ohio Universities College of Medicine, Rootstown, Ohio 44272

The ICP34.5 protein facilitates herpes simplex virus replication by binding and activating protein phosphatase 1 (PP1) by means of a very conserved C-terminal GADD34-like region. Natural variants of the ICP34.5 differing in the number of arginines in an Arg-rich cluster at the N terminus and the number of Pro-Ala-Thr repeats in the central bridge region of the protein were cloned as fusion proteins with a reporter peptide (c-Myc or hrGFP) at the C terminus. The natural variants were obtained from strains differing in passage history, tissue culture behavior, and neuroinvasive disease potential. In transfected cells, these variants localized to different subcellular compartments. The N-terminal Arg-rich cluster acted as a cellular localization signal for discrete regions of the nucleus and cytoplasm, but the ultimate location of ICP34.5 was determined by the number of Pro-Ala-Thr repeats in the central bridge region. PP1 colocalized with the ICP34.5 variant in cells expressing the ICP34.5. The ICP34.5-mediated, herpes simplex virus strain-dependent differences in the modulation of PP1 location and function may be responsible for the strain-associated differences in tissue culture behavior and virulence of the virus.

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