Bacterial infections are now a global threat demanding novel treatments due to the appearance of resistances against antibiotics at a high pace. The ESKAPE pathogens are those with highest importance in the EU and chronic infections due to biofilm formation are a particular task. Noninvasive pathogen-specific imaging of the infected tissue is not clinically available. Its successful implementation will enable the choice of appropriate therapy and boost efficacy. Furthermore, Gram-negative bacteria have a highly protective cellular envelope as an important resistance mechanism for drugs acting intracellularly, resulting in an alarmingly empty drug-pipeline.To overcome this gap, I will establish Lectin-directed Theranostics targeting pathogens via their extracellular carbohydrate-binding proteins at the site of infection for specific imaging and treatment. This will be implemented for the highly resistant ESKAPE pathogen Pseudomonas aeruginosa through 3 different work packages.WP1 Sweet Imaging: Design & conjugation of lectin-directed ligands to imaging probes, Optimization of ligand/linker, in vivo proof-of-concept imaging study.WP2 Sweet Targeting: Delivery of antibiotics to the infection through covalent linking of lectindirecting groups. Employing different antibiotics, assessment of bactericidal potency and targeting efficiency. Manufacturing of nano-carriers with surface exposed lectin-directed ligands, noncovalent charging with antibiotics. In vitro and in vivo targeting.WP3 Sweet SMART Targeting: Conjugates as SMART drugs: specific release of anti-biofilm lectin inhibitor and drug cargo upon contact with pathogen, development of linkers cleavable by pathogenic enzymes.SWEETBULLETS will establish fundamentally novel lectin-directed theranostics to fight these deleterious infections and provide relief to nosocomially infected and cystic fibrosis patients. It is rapidly extendable towards other ESKAPE pathogens, e.g. Klebsiella spp.