Abstract
An acidic non-histone chromosomal protein of low mobility group (LMG) with pI of 5-5.5 and molecular weight of 160 kDa (named LMG160), has been isolated from rat liver nuclei and its inhibitory effect on transcription of DNA in vitro has been detected in a heterologous prokaryotic in vitro transcription system (T7 RNA polymerase) and also confirmed in the homologous cell-free system of rat liver nuclear extract. The results indicate that in the presence of non-histone protein LMG160, in vitro RNA synthesis represses in the both systems, which can suggest a functional role for this non-histone chromosomal protein.
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