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Bacterial Signaling01:30

Bacterial Signaling

Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...
Physical Methods for Controlling Microbial Growth: Radiation and Filtration01:26

Physical Methods for Controlling Microbial Growth: Radiation and Filtration

Radiation and filtration are essential tools for microbial control, targeting microorganisms through distinct mechanisms. Radiation eliminates microbes by damaging their DNA, either killing them or inhibiting their growth. Based on wavelength, radiation is classified into two types: nonionizing and ionizing radiation.Non-ionizing radiation, such as UV radiation (200–400 nm), is absorbed by DNA, causing defects that effectively disinfect surfaces, air, and water, including safety cabinets.

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Related Experiment Video

Updated: May 14, 2026

High-throughput Identification of Bacteria Repellent Polymers for Medical Devices
10:43

High-throughput Identification of Bacteria Repellent Polymers for Medical Devices

Published on: November 5, 2016

A technology for developing synbodies with antibacterial activity.

Valeriy Domenyuk1, Andrey Loskutov, Stephen Albert Johnston

  • 1The Biodesign Institute of Arizona State University, Tempe, Arizona, United States of America.

Plos One
|February 2, 2013
PubMed
Summary

Researchers developed a novel synbody system to discover new antibacterial agents. This method identifies specific peptides targeting bacteria, offering a promising alternative to broad-spectrum antibiotics for combating resistance.

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Area of Science:

  • Microbiology
  • Biotechnology
  • Drug Discovery

Background:

  • Antibiotic resistance is a growing global health threat, necessitating the development of novel antibacterial strategies.
  • Broad-spectrum antibiotics contribute to resistance, highlighting the need for targeted therapeutic approaches.
  • Protein affinity agents, termed synbodies, offer high specificity for target molecules.

Purpose of the Study:

  • To adapt the synbody production system for the discovery of new antibacterial candidates.
  • To identify peptides with specific binding or killing functions against target bacteria.
  • To evaluate the efficacy of engineered synbodies as antibacterial agents.

Main Methods:

  • Screening of 10,000 random sequence peptides against target bacteria.
  • Utilizing membrane labeling and intracellular dyes to identify functional peptides.
  • In vitro testing of identified peptides and engineered synbodies for antibacterial activity.

Main Results:

  • Identification of both binding and lytic peptides against target bacteria.
  • Confirmation of antibacterial activity in lead peptides through in vitro assays.
  • Development of a synbody with enhanced antibacterial activity against Staphylococcus aureus by linking functional peptides.
  • Demonstration that the engineered synbody can protect cells from S. aureus-induced killing in co-culture experiments.

Conclusions:

  • The synbody system is a feasible platform for discovering novel antibacterial agents.
  • Targeted antibacterial agents can be developed using specific peptide identification and engineering.
  • Synbodies show potential for combating antibiotic resistance by providing specific therapeutic options.