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Changing the conversation – polymers disrupt bacterial communication

Polymers disrupt bacterial communication - 12 November 2013. Nottingham University
News from: The University of Nottingham

New understanding of bacterial community behaviour will have implications for synthetic biology.

Artificial materials based on simple synthetic polymers can disrupt the way in which bacteria communicate with each other, a BBSRC-funded study led by scientists at The University of Nottingham has shown.

The findings, published in the journal Nature Chemistry, could further our knowledge on how better to control and exploit bacteria in the future and will have implications for work in the emerging field of synthetic biology.

Professor Cameron Alexander, in the University's School of Pharmacy, led the study. He said: "This is an exciting and unexpected finding for us and comes as a result of research which was very much curiosity driven.

"It gives us more information about how to design artificial cells and to produce materials that will interact with microorganisms and control their behaviour, with a whole host of potential applications including drug discovery and energy production."

As part of their research into the development of artificial cells and programmable bacterial coatings, the team found that polymers - long-chain molecules - that were able to arrange bacteria into clustered communities were, surprisingly, encouraging these bacteria to actively 'talk' to each other. This communication occurred by quorum sensing (QS), a way in which bacteria signal to each other, and coordinate response to environment. Quorum sensing also controls the way in which bacteria release certain types of molecules - for example as a defence mechanism or as tools for infection.

This finding opens up the possibility to influence microbial behaviour by controlling their ability to form productive communities. This can be exploited to prevent the release of toxins during the spread of infection or, alternatively, the production of useful molecules which can act as drugs, food source or biofuels.

Vibrio bacteria (blue) with graphical representations of polymers and bacterial signal molecules. Image: Professor Cameron Alexander
Vibrio bacteria (blue) with graphical representations of polymers and bacterial signal molecules.
Image: Professor Cameron Alexander

The researchers used the bioluminescent marine bacterium Vibrio harveyi, as it allows them to easily track the changes in the bacteria's behaviour by measuring the pattern and intensity of the natural light produced by the organism.

Building on some intriguing initial results, the team of pharmacists, microbiologists chemists and computer scientists were also able to produce computational models predicting and explaining the behaviour of the microbial communities, which were crucial to deduct simple design principles for the programmable interaction of bacteria and polymers.

Overall, this research offers new understanding of bacterial community behaviour and will have implications in the design of materials as antimicrobials, for bioprocessing, biocomputation and, more generally, synthetic biology.

The study also involved scientists from the universities of Birmingham and Newcastle, with additional funding from EPSRC.

ENDS

Notes to editors

The paper, Bacteria clustering by polymers induces the expression of quorum sense controlled phenotypes, is available online on the Nature Chemistry website.

More information is available from Professor Cameron Alexander on +44 (0)115 846 7678, cameron.alexander@nottingham.ac.uk or see external contacts below.

About the University of Nottingham

The University of Nottingham has 42,000 students and is 'the nearest Britain has to a truly global university, with campuses in China and Malaysia modelled on a headquarters that is among the most attractive in Britain' (Times Good University Guide 2014). It is also one of the most popular universities among graduate employers, one of the world's greenest universities, and winner of the Times Higher Education Award for 'Outstanding Contribution to Sustainable Development'. It is ranked in the World's Top 75 universities by the QS World University Rankings.

More than 90% of research at The University of Nottingham is of international quality, according to the most recent Research Assessment Exercise. The University aims to be recognised around the world for its signature contributions, especially in global food security, energy & sustainability, and health. The University won a Queen's Anniversary Prize for Higher and Further Education for its research into global food security.

External contact

Emma Thorne, Media Relations Manager, Communications Office, The University of Nottingham


Tel: 01159 515793