Able to form a pore in lipid bilayers. May form trimers. Outer membrane location shown for Nine Mile phase I, but not that it actually spans the membrane. Found in the large cell variant (LCV) stage, very little is present in the small cell variant (SCV) stage (at protein level). LCVs are more metabolically active than SCVs. Might be used for vaccine production. Belongs to the Coxiella porin P1 (CPP1) (TC 1.B.43) family.