CG3066 encodes a prophenoloxidase‐activating enzyme.

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Presentation transcript:

CG3066 encodes a prophenoloxidase‐activating enzyme. CG3066 encodes a prophenoloxidase‐activating enzyme. (A) Prophenoloxidase (proPO), which is absent from the haemolymph of Black cell (Bc) flies, is cleaved after immune challenge in wild‐type (WT) flies but not in flies homozygous for the CG3066KG02818 insertion (CG3066KG02818). The blot, incubated with anti‐proPO antibodies (anti‐PPO), was stripped and re‐probed with anti‐Serpin27A antibodies (anti‐Serpin27A, arrow, the lowest band is unspecific; Ligoxygakis et al, 2002b). Serpin27A is depleted after immune challenge in the haemolymph of WT and Bc mutant flies, but not in the haemolymph of flies homozygous for CG3066KG02818. (B) Phenoloxidase activity is detected (as absorbance at an optical density of 492 nm (OD492 nm) after conversion of l‐3,4‐dihydroxyphenylalanine) in the haemolymph of immune‐challenged WT flies, but not in the haemolymph of CG3066KG02818 immune‐challenged flies (PAE1) or WT non‐challenged flies (ni). (C) proPO fails to be cleaved when CG3066KG02818 homozygous flies are infected (i) with the yeast Candida albicans, as is the case after bacterial infection. (D) Immunoblotting experiments with anti‐proPO antibodies on the haemolymph of control (c) or infected (i) flies show that the proPO cleavage, which is absent in CG3066KG02818 (PAE1) mutant flies, is restored when the KG02818 insertion is excised (Ex) or when a WT copy of the CG3066 gene (UAS‐CG3066), but not a version mutated in the catalytic domain of the protein (UAS‐CG3066*), is expressed in the CG3066KG02818 background. (E) In the absence of any challenge (c), the expression of an activated form of the CG3066‐encoded protein (UAS‐ΔPAE1) leads to the constitutive cleavage of proPO. Vincent Leclerc et al. EMBO Rep. 2006;7:231-235 © as stated in the article, figure or figure legend