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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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The lac operon in Escherichia coli is a model for understanding inducible gene regulation and metabolic flexibility. It integrates local control by lactose and global regulation through catabolite repression, enabling E. coli to preferentially metabolize glucose when available and switch to lactose utilization when glucose is scarce.Structure and Function of the lac OperonThe lac operon contains three structural genes: lacZ (β-galactosidase), lacY (lactose permease), and lacA...
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Lipopolysaccharides (LPS) are crucial components of the outer membrane of Gram-negative bacteria, serving both structural and functional roles. It contributes to membrane stability and protects bacteria from host immune responses. LPS is composed of three major regions—lipid A, a core oligosaccharide, and an O antigen. The biosynthesis and assembly of LPS involve a highly coordinated set of enzymatic reactions and transport mechanisms. Additionally, LPS is recognized as an endotoxin,...
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Prokaryotes can control gene expression through operons—DNA sequences consisting of regulatory elements and clustered, functionally related protein-coding genes. Operons use a single promoter sequence to initiate transcription of a gene cluster (i.e., a group of structural genes) into a single mRNA molecule. The terminator sequence ends transcription. An operator sequence, located between the promoter and structural genes, prohibits the operon’s transcriptional activity if bound by...
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Microbial membranes exhibit remarkable diversity in lipid composition, reflecting evolutionary adaptations to various environmental conditions. The three domains of life—Bacteria, Archaea, and Eukarya—synthesize membrane lipids through distinct biosynthetic pathways, leading to fundamental structural differences that impact membrane stability, function, and adaptability.Fatty Acid-Based Lipids in Bacteria and EukaryaBacteria and eukaryotes share a common fatty acid biosynthesis...
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Biological agents offer an effective means of controlling microbial growth by leveraging natural processes like predation, competition, and the secretion of antimicrobial substances.Predatory bacteria such as Bdellovibrio species target and kill pathogens like Salmonella and E. coli. They are widely used in poultry farms to control infections. Myxococcus species help combat plant-pathogenic fungi. These naturally occurring predators serve as eco-friendly alternatives to chemical pesticides and...
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Macrolactins: biological activity and biosynthesis.

Ting Wu1, Fei Xiao1, Wenli Li1,2

  • 1Key Laboratory of Marine Drugs, Ministry of Education of China, School of Medicine and Pharmacy, Ocean University of China, Qingdao, 266003 China.

Marine Life Science & Technology
|April 19, 2023
PubMed
Summary
This summary is machine-generated.

Marine microorganisms yield novel macrolactins (MLNs) with diverse biological activities, including anticancer and antiviral properties. Recent research explores their biosynthesis and potential for drug development.

Keywords:
Biological activitiesBiosynthesisMacrolactinsStructural diversity

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Area of Science:

  • Marine natural products chemistry
  • Microbial biosynthesis
  • Drug discovery

Background:

  • Marine microorganisms are prolific sources of unique natural products.
  • Macrolactins (MLNs) are 24-membered lactones with broad bioactivities (antibacterial, antifungal, antiviral, anticancer, anti-inflammatory, anti-angiogenic).
  • MLNs are biosynthesized through a type I polyketide synthase (PKS) pathway with subsequent tailoring modifications.

Purpose of the Study:

  • To review newly discovered macrolactins (MLNs) from the past five years.
  • To summarize the biological activities of these MLNs.
  • To discuss relevant biosynthetic studies and structural diversification strategies.

Main Methods:

  • Literature review of scientific publications from the last five years.
  • Analysis of reported structures, biological activities, and biosynthetic pathways of MLNs.
  • Focus on combinatorial biosynthesis strategies for MLN structural diversification.

Main Results:

  • Identification and characterization of newly discovered MLNs.
  • Detailed description of their diverse pharmacological activities.
  • Insights into the biosynthetic mechanisms and tailoring steps involved in MLN production.

Conclusions:

  • Newly discovered MLNs continue to exhibit significant and diverse biological activities.
  • Understanding MLN biosynthesis opens avenues for structural modification and drug development.
  • Marine-derived MLNs represent a promising class of compounds for future therapeutic applications.