passages.id: split_1_test_1442_passage
passages.type: progene_text
passages.text: The predicted 142 kDa protein product possesses the three domains that are typical of SPATE autotransporters : an unusually long signal sequence of 49 amino acids ; a 107 kDa passenger domain containing a consensus serine protease active site ( GDSGSG ) ; and a C - terminal autotransporter domain of 30 kDa .