Comparison of expressed and purified recombinant PtPEPCase 1 derivatives. (a) SDS-PAGE analysis of three types of PtPEPCase 1 expressed in E. coli BL21-CodonPlus (DE3)-RIPL. Protein samples were separated using 8% SDS-PAGE and stained with Bio-Safe Coomassie G-250 Stain solution. The arrow indicates the band corresponding to PtPEPCase 1 derivatives in the soluble fraction lane. M: protein marker; Total: total crude extract of uninduced and induced cells; Ins: Insoluble fraction; Sol: soluble fraction. (b) SDS-PAGE analysis of partially purified PtPEPCase 1 derivatives after His-affinity chromatography. The purified proteins were separated by electrophoresis on 10% SDS-PAGE gels, followed by staining with Coomassie Brilliant Blue solution. lane 1: PtPEPCase 1; lane 2: mPtPEPCase 1; lane 3: cPtPEPCase 1. (c) Immunoblotting analysis of the purified recombinant PtPEPCase 1 s of different types with anti-PEPCase antibody. Proteins of approximately 114, 111, and 107 kDa were detected in each lane through Western blotting. lane 1: PtPEPCase 1; lane 2: mPtPEPCase 1; lane 3: cPtPEPCase 1.