– Forms pores that allow passive diffusion of small molecules across the outer membrane. In K.pneumoniae it has been shown to bind the C1Q component and activate the classical pathway of the complement system. OmpC Protein, Klebsiella pneumoniae, Recombinant (His & Myc) is expressed in E. coli expression system with N-10xHis and C-Myc tag. The predicted molecular weight is 45.0 kDa and the accession number is Q48473.