Difference between revisions of "Part:BBa K1689012"

Revision as of 14:34, 17 November 2015

dCas9-Nlact

N-terminal fragment of β-lactamase fused with dCas9

β-Lactamase (AmpR) is produced by some bacteria, providing resistance against penicilins and so on. The β-Lactamase hydrolyzes β-lactam's conservative ring region, deactivating the antibiotic, and it can be used for the treatment of bacterial infection.
In our project, β-Lactamase is used to catalyze the hydrolysis of penicillin to penicillinoic acid. This redox reaction leads to current changes, which can be detected using A3 electrode system [1]. We dissected β-Lactamase between Gly196 and Leu198 [2], for they are on the opposite side of the active site. Moreover, we can enhance the activity and metabolically stability of β-Lactamase by introducing M182T mutation [2], which disrupts an inactive molten-globule intermediate of β-Lactamase.




Reference:
1. do Prado, T. M., Foguel, M. V., Gonçalves, L. M., & Maria del Pilar, T. S. (2015). β-Lactamase-based biosensor for the electrochemical determination of benzylpenicillin in milk. Sensors and Actuators B: Chemical, 210, 254-258.
2. Galarneau, A., Primeau, M., Trudeau, L. E., & Michnick, S. W. (2002). β-Lactamase protein fragment complementation assays as in vivo and in vitro sensors of protein–protein interactions. Nature biotechnology, 20(6), 619-622.

Sequence and Features