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Biosynthesis in bacteria is a fundamental anabolic process that generates essential macromolecules, including proteins, nucleic acids, lipids, and polysaccharides. These macromolecules are critical for cellular growth, replication, and function. The process is tightly regulated and energetically linked to catabolic pathways to ensure optimal resource utilization.Biosynthetic pathways begin with precursor metabolites such as pyruvate, acetyl-CoA, and glucose-6-phosphate derived from glycolysis,...
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Structure of PeptidoglycanPeptidoglycan is a vital structural component of the bacterial cell wall, providing mechanical strength and shape to the cell. It consists of repeating units of two sugars—N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM)—linked by β-1,4 glycosidic bonds. These sugar chains are cross-linked by short peptide chains, forming a mesh-like polymer that surrounds the bacterial plasma membrane.Cytoplasmic Phase – Precursor SynthesisPeptidoglycan...
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The Logic, Experimental Steps, and Potential of Heterologous Natural Product Biosynthesis Featuring the Complex Antibiotic Erythromycin A Produced Through E. coli
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Next-Generation Total Synthesis of Vancomycin.

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A new 19-step total synthesis of vancomycin provides a scalable route to modified analogues. This method overcomes resistance mechanisms by enabling the creation of novel vancomycin derivatives.

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Area of Science:

  • Organic Chemistry
  • Medicinal Chemistry
  • Synthetic Chemistry

Background:

  • Vancomycin is a critical antibiotic for treating serious Gram-positive bacterial infections.
  • Emergence of vancomycin-resistant bacteria necessitates development of novel therapeutic agents.
  • Total synthesis of vancomycin and its analogues is crucial for structure-activity relationship studies and drug discovery.

Purpose of the Study:

  • To develop a next-generation, highly efficient total synthesis of vancomycin aglycon.
  • To establish a scalable synthetic route for generating pocket-modified vancomycin analogues.
  • To facilitate the creation of new antibiotics targeting vancomycin resistance.

Main Methods:

  • A 17-step synthesis of vancomycin aglycon from amino acid subunits.
  • Kinetically controlled diastereoselective introduction of atropisomerism.
  • Ligand-controlled atroposelective Miyaura borylation-Suzuki coupling for biaryl axis formation.
  • Scalable macrolactamization and room-temperature SNAr cyclizations for ring closures.
  • Protecting group-free enzymatic glycosylation.

Main Results:

  • Achieved a 17-step synthesis of vancomycin aglycon with high diastereoselectivity (>20:1 dr for AB axis, >30:1 dr for macrolactamization).
  • Efficient sequential CD (8:1 dr) and DE (14:1 dr) ring closures using SNAr cyclizations.
  • A 19-step total synthesis of vancomycin, including a two-step enzymatic glycosylation.
  • Demonstrated a viable strategy for large-scale synthesis of vancomycin analogues.

Conclusions:

  • The developed synthetic route is efficient and scalable for producing vancomycin and its analogues.
  • This approach enables the synthesis of modified vancomycin derivatives to combat antibiotic resistance.
  • The strategy opens avenues for developing next-generation antibiotics targeting resistant pathogens.