1198
This novel enzyme is distinct from E6-AP , the p53 -conjugating ligase , and from E3 alpha , the "N-end rule" ligase .
 protein: "N-end rule" ligase; protein: E3; protein: E6-AP; protein: p53; protein: E3 alpha; protein: p53 -conjugating ligase
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: "N-end rule" ligase; protein: E3; protein: E6-AP; protein: p53; protein: E3 alpha; protein: p53 -conjugating ligase