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Related Concept Videos

Antimicrobial Proteins01:23

Antimicrobial Proteins

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Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
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Methicillin-resistant Staphylococcus aureus (MRSA) presents a critical public health threat, arising from its capacity to resist β-lactam antibiotics due to acquisition of the mecA gene within the staphylococcal cassette chromosome mec (SCCmec). This gene encodes penicillin-binding protein 2a (PBP2a), which impairs binding efficacy of methicillin and other β-lactams. MRSA has evolved into distinct clonal lineages impacting humans and animals alike, reinforcing its significance within...
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Antibiotic resistance in bacteria arises when microorganisms evolve the ability to withstand drugs designed to kill them or inhibit their growth, rendering once-effective treatments useless. This phenomenon, driven by genetic change and selection under antibiotic exposure, poses a profound threat to modern medicine. Mechanisms include drug-inactivating enzymes (e.g., β-lactamases), efflux pumps that eject antibiotics, mutations altering antibiotic targets, decreased drug uptake, and...
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The skin and mucous membranes serve as the primary line of defense against pathogens by providing both physical and chemical protection. These barriers are essential in preventing the entry and establishment of microbes, thereby maintaining the integrity of the host.
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The effectiveness of antimicrobial agents depends on various factors influencing their ability to eliminate microbial populations. Larger microbial populations require more time for complete eradication, emphasizing the importance of population size analysis when evaluating antimicrobial efficacy.Microbial resistance to antimicrobial agents varies significantly. Highly resilient microorganisms include endospores, gram-negative bacteria, and non-enveloped viruses, while prions are exceptionally...
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Antibiotic resistance is a major public health concern that arises when bacteria evolve mechanisms to withstand the effects of antibiotic treatments. This resistance can be intrinsic, acquired through genetic mutations, or transferred between bacteria via horizontal gene transfer. The development of antibiotic resistance poses significant challenges in treating bacterial infections and necessitates ongoing research to develop new therapeutic strategies.Intrinsic resistance occurs when bacterial...
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Antimicrobial Peptides Produced by Selective Pressure Incorporation of Non-canonical Amino Acids
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Salt-resistant short antimicrobial peptides.

Harini Mohanram1, Surajit Bhattacharjya1

  • 1School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, Singapore, 637551.

Biopolymers
|February 7, 2016
PubMed
Summary

New antimicrobial peptides (AMPs) show potent activity against drug-resistant bacteria, even in salt and serum. These short, designed peptides offer a promising, cost-effective approach to developing novel antibiotics.

Keywords:
LPS-AMP interactionsantimicrobial peptideslipopolysaccharidemembranesalt resistant AMPs

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Area of Science:

  • Biochemistry
  • Microbiology
  • Medicinal Chemistry

Background:

  • Antimicrobial peptides (AMPs) are vital in combating drug-resistant bacteria.
  • In vivo applications of AMPs are limited by salt/serum inactivation and high synthesis costs.
  • Short, stable AMPs are needed for developing effective peptide antibiotics.

Purpose of the Study:

  • To design and evaluate short, salt- and serum-resistant antimicrobial peptides.
  • To investigate the mechanism of action and interactions with bacterial membranes.
  • To provide insights for creating next-generation antimicrobial peptide therapeutics.

Main Methods:

  • Design of a 12-residue peptide (RR12) and two analogs (RR12Wpolar, RR12Whydro).
  • Assessment of antibacterial activity in the presence of varying NaCl concentrations and human serum.
  • Evaluation of hemolytic activity and bacterial membrane permeabilization.
  • Investigation of peptide interactions with lipopolysaccharide (LPS) using biophysical methods.

Main Results:

  • Designed peptides exhibited potent antibacterial activity (MIC 2–8 μM) in 150–300 mM NaCl and human serum.
  • Peptides RR12 and RR12Whydro showed low hemolytic activity.
  • Mechanism involves bacterial membrane permeabilization and cell lysis.
  • Peptides adopted helical structures upon binding to LPS, disrupting LPS aggregates.

Conclusions:

  • Designed peptides demonstrate significant salt and serum resistance, crucial for in vivo efficacy.
  • These peptides effectively target bacterial membranes and LPS.
  • The study offers a rational design strategy for developing robust antimicrobial peptide antibiotics.