passages.id: split_4_validation_1661_passage
passages.type: progene_text
passages.text: Our results show that the sequence ( 32 ) LGVKDDWLLV ( 41 ) in the 3C protease serves as a protein destruction signal recognized by the ubiquitin - protein ligase E3alpha and that the destruction signal for the RNA polymerase does not require the carboxyl - terminal 137 amino acids .