ENHANCER ELEMENTS IN PROKARYOTIC SYSTEM

摘要

＜正＞ Since Banerji et al.first discovered transcription enhancer elements in SV40 genomesin 1981,a series of similar enhancer sequences have been found in eukaryotic cells as well asin some animal viral genomes.Enhancer sequence is now considered as an importantand essential element for the control of gene transcription in eukaryotic cells.It is uncertain,however,whether similar DNA elements are also present in the prokaryotic system.In 1984we found that a DNA fragment from the SV40 genome,which was located about 1 kb up-