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. 1988 Mar;62(3):732–743. doi: 10.1128/jvi.62.3.732-743.1988

Physical and functional domains of the herpes simplex virus transcriptional regulatory protein ICP4.

N A DeLuca 1, P A Schaffer 1
PMCID: PMC253626  PMID: 2828668

Abstract

A characteristic common to DNA animal viruses is the expression early in infection of viral proteins that act in trans to regulate subsequent RNA polymerase II-dependent transcription of the remainder of the viral genome. The predominant transcriptional regulatory protein specified by herpes simplex virus type 1 is the immediate-early protein ICP4. ICP4 is a complex multifunctional protein required for the activation of many herpes simplex virus type 1 transcriptional units and for repression of its own transcription. In the present study we have introduced nonsense and deletion mutations into both genome copies of the ICP4 gene such that the resulting mutants express only defined subsets of the primary ICP4 amino acid sequence. The partial peptides retain activities and physical properties of the intact ICP4 molecule, permitting one to attribute individual activities and properties to defined amino acid sequences.

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