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Computer simulations aid understanding of bacterial resistance against commonly used antibiotics

Date:
July 22, 2011
Source:
Public Library of Science
Summary:
A recent study into the interactions between aminoglycoside antibiotics and their target site in bacteria used computer simulations to elucidate this mechanism and thereby suggest drug modifications.

A recent study into the interactions between aminoglycoside antibiotics and their target site in bacteria used computer simulations to elucidate this mechanism and thereby suggest drug modifications.

In the article, which will be published on July 21st in the open-access journal PLoS Computational Biology, researchers from University of Warsaw, Poland, and University of California San Diego, USA, describe their study of the physical basis of one bacterial resistance mechanism -- mutations of the antibiotic target site, namely RNA of the bacterial ribosome. They performed simulations and observed changes in the interaction between the antibiotic and the target site when different mutations were introduced.

In hospitals throughout the world, aminoglycosidic antibiotics are used to combat even the most severe bacterial infections, being very successful especially against tuberculosis and plague. However, the continuous emergence of resistant bacteria has created an urgent need to improve these antibiotics. Previous experiments on bacteria have shown that specific point mutations in the bacterial ribosomal RNA confer high resistance against aminoglycosides. However, the physico-chemical mechanism underlying this effect has not been known. Using computer simulations the researchers explained how various mutations in this specific RNA fragment influence its dynamics and lead to resistance.

Bacteria have developed other ways of gaining resistance, not just through mutations, and further studies are underway. The authors are now investigating the resistance mechanism by which bacterial enzymes actively modify and neutralize aminoglycosidic antibiotics. These molecular modeling studies together with experiments could help to design even better aminoglycoside derivatives in the future.


Story Source:

The above story is based on materials provided by Public Library of Science. Note: Materials may be edited for content and length.


Journal Reference:

  1. Julia Romanowska, J. Andrew McCammon, Joanna Trylska. Understanding the Origins of Bacterial Resistance to Aminoglycosides through Molecular Dynamics Mutational Study of the Ribosomal A-Site. PLoS Computational Biology, 2011; 7 (7): e1002099 DOI: 10.1371/journal.pcbi.1002099

Cite This Page:

Public Library of Science. "Computer simulations aid understanding of bacterial resistance against commonly used antibiotics." ScienceDaily. ScienceDaily, 22 July 2011. <www.sciencedaily.com/releases/2011/07/110721172330.htm>.
Public Library of Science. (2011, July 22). Computer simulations aid understanding of bacterial resistance against commonly used antibiotics. ScienceDaily. Retrieved July 29, 2014 from www.sciencedaily.com/releases/2011/07/110721172330.htm
Public Library of Science. "Computer simulations aid understanding of bacterial resistance against commonly used antibiotics." ScienceDaily. www.sciencedaily.com/releases/2011/07/110721172330.htm (accessed July 29, 2014).

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