passages.id: split_4_test_2734_passage
passages.type: progene_text
passages.text: We report the cloning of the arginine repressor gene from the psychropiezophilic Gram - negative bacterium Moritella profunda , the purification of its product ( ArgR ( Mp ) ) , the identification of the operator in the bipolar argECBFGH ( A ) operon , in vivo repressibility studies , and an in vitro analysis of the repressor - operator interaction , including binding to mutant and heterologous arginine operators .