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M94A0249.TXT
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1994-10-08
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Document 0249
DOCN M94A0249
TI Human cytomegalovirus late protein encoded by ie2: a trans-activator as
well as a repressor of gene expression.
DT 9412
AU Jenkins DE; Martens CL; Mocarski ES; Department of Microbiology and
Immunology, Stanford University; School of Medicine, California
94305-5402.
SO J Gen Virol. 1994 Sep;75 ( Pt 9):2337-48. Unique Identifier : AIDSLINE
MED/94358733
AB In order to study the function of human cytomegalovirus (HCMV) immediate
early gene 2 (ie2) (UL122) gene products made at late times during
infection, cDNA clones were isolated from an expression library made
with 74 h post-infection mRNA. Based on screening of the library, 1% of
transcripts in infected cells at this time were ie2 region-specific, and
transcripts encoding gamma IE2(338aa), a 40K late gene product, were
more abundant than those encoding IE2(579aa), an alpha gene product made
throughout infection. As expected, the cDNA capable of directing the
expression of gamma IE2(338aa) was derived from a contiguous genomic
region within exon 5 of the ie1/ie2 region. The cDNA clones encoding
gamma IE2(338aa) and IE2(579aa) were compared for their ability to
trans-activate viral and cellular promoters and to repress expression
from the ie1/ie2 promoter via the ie2 cis-repression signal.
Unexpectedly, gamma IE2(338aa) trans-activated a variety of test
promoters when cotransfected with the major alpha gene product,
IE1(491aa). Promoters derived from the cellular beta-actin gene, the
simian virus 40 early region and the human immunodeficiency virus were
all responsive to gamma IE2(338aa) plus IE1(491aa), although several
beta promoters derived from the HCMV genome were unresponsive. Thus,
this abundant late product from the ie2 region may play a role in
trans-activation in addition to its role as a repressor of alpha gene
expression.
DE Animal Base Sequence Cell Line Cells, Cultured Cercopithecus
aethiops Chloramphenicol Acetyltransferase/BIOSYNTHESIS Cloning,
Molecular Cytomegalovirus/GENETICS/*METABOLISM DNA Primers DNA,
Complementary/METABOLISM Fibroblasts *Gene Expression Regulation,
Viral Gene Library *Genes, Immediate-Early *Genes, Viral Human
Immediate-Early Proteins/GENETICS/*METABOLISM Male Molecular Sequence
Data Plasmids Polymerase Chain Reaction Restriction Mapping RNA,
Messenger/BIOSYNTHESIS Skin Support, U.S. Gov't, P.H.S.
*Trans-Activation (Genetics) Trans-Activators/GENETICS/*METABOLISM
Transfection JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).