Zwitterionic polymers-armored amyloid-like protein surface combats thrombosis and biofouling

Proteins,cells and bacteria adhering to the surface of medical devices can lead to thrombosis and infection,resulting in significant clinical mortality.Here,we report a zwitterionic polymers-armored amyloid-like protein surface engineering strategy we called as“armored-tank”strategy for dual functionalization of medical devices.The“armored-tank”strategy is realized by decoration of partially conformational transformed LZM(PCTL)assembly through oxidant-mediated process,followed by armoring with super-hydrophilic poly-2-methacryloyloxyethyl phosphorylcholine(pMPC).The outer armor of the“armored-tank”shows potent and durable zone defense against fibrinogen,platelet and bacteria adhesion,leading to long-term antithrombogenic properties over 14 days in vivo without anticoagulation.Additionally,the“fired”PCTL from“armored-tank”actively and effectively kills both Gram-positive and Gram-negative bacterial over 30 days as a supplement to the lacking bactericidal functions of passive outer armor.Overall,this“armored-tank”surface engineering strategy serves as a promising solution for preventing biofouling and thrombotic occlusion of medical devices.