CD91 plays an important role in the scavenging of apoptotic material, pos-sibly through binding to soluble pattern-recognition molecules. In this study, we investigated the interaction of CD91 with mannan-binding lectin (MBL), ficolins and lung surfactant proteins. Both MBL and L-ficolin were found to bind CD91. The MBL–CD91 interaction was time- and concentra-tion-dependent and could be inhibited by known ligands of CD91.