Proteolysis targeting chimeras (PROTACs) technology is a novel and promising therapeutic strategy using small molecules to induce ubiquitin-dependent degradation of proteins.
Teixobactin represents a new class of antibiotics with novel structure and excellent activity against Gram-positive pathogens and
Mycobacterium tuberculosis
. Herein, we report a one-pot reaction to conveniently construct the key building block
l
-allo-Enduracidine in 30-gram scale in just one hour and a convergent strategy (3 + 2 + 6) to accomplish a gram-scale total synthesis of teixobactin. Several analogs are described, with
20
and
26
identified as the most efficacious analogs with 3~8-fold and 2~4-fold greater potency against vancomycin resistant
Enterococcus faecalis
and methicillin-resistant
Staphylococcus aureus
respectively in comparison with teixobactin. In addition, they show high efficiency in
Streptococcus pneumoniae
septicemia mouse model and neutropenic mouse thigh infection model using methicillin-resistant
Staphylococcus aureus
. We also propose that the antiparallel β-sheet of teixobactin is important for its bioactivity and an antiparallel dimer of teixobactin is the minimal binding unit for lipid II via key amino acids variations and molecular docking.
In this work, a series of prodrugs of grifolin with much improved solubility and stability were designed and synthesis, which potently downregulated DNMT1 and inhibited tumor proliferation in vitro and in vivo.
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