This invention discloses BacPROTACs targeting dihydropteranoic acid synthase, their preparation method, and their applications, belonging to the fields of
medicinal chemistry and anti-infective
drug technology. The BacPROTACs have the structure shown in Formula I, II, or III, and are composed of a DHPS inhibitor fragment, a
linker group, and a phosphorylated
arginine (pArg) fragment. The pArg fragment, as a functional group capable of interacting with the bacterial ClpCP
protease system, is coupled to a DHPS inhibitor through linkers of different types and chain lengths, resulting in
bifunctional molecules possessing both DHPS binding and ClpCP recruitment capabilities. These compounds can recruit the ClpCP
protease system while binding to DHPS, thereby inducing or promoting DHPS degradation, reducing
target protein levels, and expanding the pharmacodynamic mechanism of DHPS-targeted drugs. Compared with existing DHPS inhibitors that mainly rely on
reversible inhibition, this invention provides a new technical solution for the development of antibacterial drugs through a
design strategy combining inhibition and targeted degradation. These compounds can be used to prepare antibacterial drugs.