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Ag43 Autotransporter Bilkent-UNAMBG 2019 iGEM Team

Introduction:

Antigen 43 (Ag43) is found in E. coli and functions as a autotransporters under the family of self associating autotransporters. Expressed Ag43 in E. coli result in the Ag43-Ag43 interactions which mediate the autoaggregation of the cell. Ag43 is cell surface exposed protein which can carry and display the cargo protein on the outer membrane. Autoaggregation of the cell is conferred by the a passenger domain. We aimed to improve this part by changing, deleting, the first 160 amino acids of the a passenger domain. With the deletion of first 160 amino acids which is responsible for the cell aggregation mediation, Ag43 structure become truncated and does not confer the cell to cell aggregation.

Materials and Methods :

By using primers specifically designed for amplifying the region that excludes first 160 amino acids of the alpha subunit. We have obtained the Ag43 from the E. coli genome by Colony PCR. Gene size was demonstrated in the agarose gel image which was prepared in concentration of %1.

Result: Ag43 containing plasmid was induced with the aTc after OD has reached to 0.4. Cells were monitored for 4 hours in a every hour period. At the end of 4 hours, we demonstrated that 160N deletion in alpha subunit did not confer to any cell to cell aggregation, on the other hand native Ag43 has depicted cell to cell aggregation.

Figure 1: Native Ag43 alpha subunit (Uninduced-Induced)

Figure 2: 160N deletion in alpha subunit confers to no aggregation (Uninduced-Induced)

Sequence and Features