Difference between revisions of "Part:BBa K3332026"

Revision as of 18:30, 27 October 2020

phnJ_mut40&16

The mutant of C-P lyase, which can degrade the glyphosate, from Enterobacterales. This subunit is essential to the activity of the whole enzyme.Use K823004 to construct a new part that can improve the capability of chassis bacteria to degrade glyphosate.

Biology

Phn system is a gene cluster for organophosphorus transport and degradation in many microorganisms. Enterobacterales use phnHIJK genes to encode C-P lyase, PhnJ protein is an essential subunit that can crack C-P bond. The 16th threonine was mutated to serine，and the 40th arginine was mutated tyrosine.

Usage

We ligased the strong promoter (BBa_J23100) and the parts (RBS-phnJ_mut16&40-Terminator, RBS-phnE1-RBS-phnE2) on the expression vector pSB1C3 by standard assembly. Then the ligation mixture was transformed into E. coli DH5α & E. coli BL21 (DE3), enabled the E. coli to degrade glyphosate at higher efficiency and improved the binding ability with the endogenous PhnHIK.

Characterization

Enzyme activity

        We use Negative Control, experiment groups phnEE and Mut16&40_phnJ-phnEE to verify that Mut16&40_phnJ can enhance the degradation of glyphosate by the chassis bacteria by our detection system. The Mut16&40_phnJ-phnEE gene cluster enhances the degration of glyphosate by the chassis bacteria compared to the blank control, but it has no difference with the phnE1E2 group, indicating that exogenous phnJ can’t bind to the endogenous PhnHIK well.

        The result is shown in Fig.2(Experiment groups in Fig.2

       Negative Control: J23100-B0034_pSB1C3

       phnE1E2: J23100-B0034-phnE1-B0034-phnE2_pSB1C3,

       phnJ-phnE1E2: J23100-B0034-phnJ-B0015-J23100-B0034-phnE1-B0034-phnE2_pSB1C3,

       Mut21-phnJ-phnE1E2: J23100-B0034-phnJ_mutR21M-B0015- J23100-B0034-phnE1-B0034-phnE2_pSB1C3

       Mut1640-phnJ-phnE1E2: J23100-B0034-phnJ_mutT16S&R40Y-B0015-J23100-B0034-phnE1-B0034-phnE2_pSB1C3

       RNAi system-phnJ-phnO-phnE1E2: J23101-OmpA 5'UTR-phnF 0.97-Hfq binding sequence-J23101- OmpA 5'UTR-phnJ 0.69-Hfq binding sequence- BBa_J61048-J23100-B0034-phnJ-B0015-J23100-phnO-B0015-J23100-B0034-phnE1-B0034-phnE2_pSB1C3).

Fig.2 Relationship between concentration of glyphosate and culture time.

Sequence and Features