In:
Journal of General Virology, Microbiology Society, Vol. 88, No. 9 ( 2007-09-01), p. 2488-2494
Kurzfassung:
The delayed-early DNA polymerase promoter of Chilo iridescent virus (CIV), officially known as Invertebrate iridescent virus , was fine mapped by constructing a series of increasing deletions and by introducing point mutations. The effects of these mutations were examined in a luciferase reporter gene system using Bombyx mori cells transfected with promoter constructs and infected with CIV. When the size of the upstream element was reduced from position −19 to −15, relative to the transcriptional start site, the luciferase activity was reduced to almost zero. Point mutations showed that each of the 5 nt (AAAAT) located between –19 and –15 were equally essential for promoter activity. Mutations at individual bases around the transcription initiation site showed that the promoter extended until position −2 upstream of the transcription start site. South-Western analysis showed that a protein of approximately 100 kDa interacted with the −19 nt promoter fragment in CIV-infected cells. This binding did not occur with a point mutant that lacked promoter activity. The AAAAT motif was also found in the DNA polymerase promoter region of other iridoviruses and in other putative CIV delayed-early genes.
Materialart:
Online-Ressource
ISSN:
0022-1317
,
1465-2099
DOI:
10.1099/vir.0.82947-0
Sprache:
Englisch
Verlag:
Microbiology Society
Publikationsdatum:
2007
ZDB Id:
2007065-2
SSG:
12
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