Fc (silent) InVivoKine(TM) human IgG1 Control

Negative control in experiments with recombinant proteins fused to human IgG1 Fc (LALA-PG)-KIH (Knobs-into-Holes) (e.g. Prod. No. AG-40B-0248). This protein is not an appropriate negative control for other standard Fc protein constructs. The protein Fc (LALA-PG)-KIH (human) IgG1 Control (rec.) is produced by using two different vectors, one encoding for the Fc (LALA-PG) Knobs sequence with a small linker (synthesizing a protein of 29kDa) and one encoding for the Fc (LALA-PG) Holes sequence (synthesizing a protein of 28kDa). Both vectors transfected into HEK293 cells produce both Fc molecules (Knobs-into-Holes technology, J.B. Ridgway, et al., Protein Eng. 9, 617 (1996)) required for dimerization and for secretion of the final protein Fc (LALA-PG)-KIH (human) IgG1 Control (rec.). The Fc contains the mutations LALA-PG that abolish the interaction between the Fc and FcgammaRs and therefore Fc undesirable effects.