PF3D7_0202000 knob-associated histidine-rich protein

Expression of truncated KAHRP. Immunofluorescence assay of K119 compared to K(re) probed with 2 antibodies against different regions of KAHRP. The anti-K1A antibody recognizes the His-rich repeat region, whereas the anti-KAHRP (repeats) antibody was raised against the 5’ and 3’ repeat regions. The first panel of each row shows a phase-contrast image of an infected erythrocyte, the second panel shows nuclear DNA of the parasite stained with DAPI, the third panel shows the reaction with the KAHRP-specific antibody, and the fourth panel represents an overlay of the 3 previous panels. The anti-K1A antibody shows no cross-reaction with uninfected erythrocytes as shown by lack of reactivity in contrast to strong rim fluorescence observed in all P. falciparum–infected red blood cells.

Rug M, Prescott SW, Fernandez KM, Cooke BM, Cowman AF. The role of KAHRP domains in knob formation and cytoadherence of P falciparum-infected human erythrocytes. Blood. 2006 108(1):370-8. PMID:16507777