Table 2.
Expression vectors used in this study
| Vector | Platform | Cloning | Antibiotica | Promotor/ Repressor | Encoded Fusion Proteinb | Tag Cleavagec |
|---|---|---|---|---|---|---|
| pVP16 | E. coli | Gateway | Amp | T5/lacIq | His8-MBP-TEV-S-target | TEV |
| pVP56K | E. coli | Flexi Vector | Kan | T5/lacI | His8-MBP-TEV-AIA-target | TEV |
| pVP68K | E. coli | Flexi Vector | Kan | T5/lacI | His8-MBP-AIA-TEV-S-target | TEV |
| pVP65K | E. coli | Flexi Vector | Kan | T5/lacI | MBP-TVMV-His8-AIA-TEV-S-target | TVMV/TEV |
| pVP91A | E. coli | Flexi Vector | Amp | T5/lacI | His8-TEV-S-target | TEV |
| pEU-His | cell-free | Restriction | Amp | SP6 | His6-X2-4-target | None |
| pEU-His-FV | cell-free | Flexi Vector | Amp | SP6 | His6-AIA-TEV-S-target | TEV |
Selection marker. Amp, ampicillin; Kan: kanamycin.
His6 or His8, N-terminal histidine tag; MBP, maltose binding protein; TVMV, tobacco vein mottling virus protease recognition sequence ETVRFQ/S; TEV, tobacco etch virus protease recognition sequence ENLYFQ; AIA, protein sequence corresponding to the SgfI nucleotide sequence used for Flexi Vector cloning; S, PCR-derived substitution of the N-terminal Met with Ser to promote TEV protease action; X2-4, 2 to 4 non-native residues whose identity varies depending on restriction enzymes used for cloning.
TEV protease is used for in vitro cleavage of fusion proteins; TVMV protease is used for in vivo cleavage of fusion proteins.