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C-terminal region of herpes simplex virus ICP8 protein needed for intranuclear localization.

Abstract：

:The herpes simplex virus single-stranded DNA-binding protein, ICP8, localizes initially to structures in the nucleus called prereplicative sites. As replication proceeds, these sites mature into large globular structures called replication compartments. The details of what signals or proteins are involved in the redistribution of viral and cellular proteins within the nucleus between prereplicative sites and replication compartments are poorly understood; however, we showed previously that the dominant-negative d105 ICP8 does not localize to prereplicative sites and prevents the localization of other viral proteins to prereplicative sites (J. Virol. 74 (2000) 10122). Within the residues deleted in d105 (1083 to 1168), we identified a region between amino acid residues 1080 and 1135 that was predicted by computer models to contain two alpha-helices, one with considerable amphipathic nature. We used site-specific and random mutagenesis techniques to identify residues or structures within this region that are required for proper ICP8 localization within the nucleus. Proline substitutions in the predicted helix generated ICP8 molecules that did not localize to prereplicative sites and acted as dominant-negative inhibitors. Other substitutions that altered the charged residues in the predicted alpha-helix to alanine or leucine residues had little or no effect on ICP8 intranuclear localization. The predicted alpha-helix was dispensable for the interaction of ICP8 with the U(L)9 origin-binding protein. We propose that this C-terminal alpha-helix is required for localization of ICP8 to prereplicative sites by binding viral or cellular factors that target or retain ICP8 at specific intranuclear sites.

journal_name

Virology

journal_title

Virology

authors

Taylor TJ,Knipe DM

doi

10.1016/s0042-6822(03)00108-9

subject

Has Abstract

pub_date

2003-05-10 00:00:00

pages

219-31

issue

2

eissn

0042-6822

issn

1096-0341

pii

S0042682203001089

journal_volume

309

pub_type

杂志文章

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