Affiliation:
1. Department of Entomology, Texas A&M University, and Texas Agricultural Experiment Station, College Station, Texas 77843-2475
Abstract
The five regions of homologous DNA which are interspersed in the genome of the baculovirus
Autographa californica
nuclear polyhedrosis virus increased the expression of a delayed-early gene of this virus. Although this activity was first observed as a 10-fold
trans
effect, the homologous region 5 (
hr
5) enhanced the expression of linked genes 1,000-fold. The
hr
5 enhancer also exhibited the other characteristics associated with viral enhancer elements, including orientation independence and the abilities to function at a distance from the linked promoter, to regulate heterologous promoters, and to increase the number of RNA polymerase molecules transcribing the linked genes. The expression of the immediate-early regulatory gene was not enhanced by
cis
-linked
hr
5, although the enhancer function may require the immediate-early regulatory gene product. The
hr
5 enhancer was relatively insensitive to competition by an excess of enhancer molecules. The nucleotide sequence of
hr
5 revealed two different conserved repeats separated by nonhomologous DNA. Deletion analysis of the
hr
5 enhancer indicated that a 30-base-pair inverted repeat was essential for enhancer function.
Publisher
American Society for Microbiology
Subject
Virology,Insect Science,Immunology,Microbiology
Cited by
216 articles.
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