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Poultry probiotic's coat clues to ability to battle bugs
Date:11/18/2013

IFR researchers have characterised the coat of a potential poultry probiotic, giving the first clues of how it may be used to exclude pathogenic bacteria from chickens.

Lactobacillus johnsonii has previously been shown to exclude Clostridium perfringens from the guts of poultry, opening the door to it being developed as a way of reducing necrotic enteritis in poultry and food poisoning in humans. Recently, researchers at the Institute of Food Research, which is strategically supported by the Biotechnology and Biological Sciences Research Council, found that the bacteria make coats for themselves that play important roles in colonisation in this strain.

Now, in a study published in The Journal of Biological Chemistry, the researchers present the first characterisation of what makes up this coat. This will give us a better idea of the role of the coat and help in the development of these bacteria as a way of combatting C. perfringens.

Using NMR spectroscopy, the researchers discovered that the coat is made up of two types of exopolysaccharides (EPS), which are long sugar-containing molecules that many bacteria use to encapsulate themselves. This capsule may help the bacteria to cope with environmental stress, or aid colonisation and adhesion. Different bacterial strains have different EPS structures, and understanding this is important as they represent a key way bacteria interact with the world around them.

'Characterising the EPS structures in the L. johnsonii strain is the first step to explaining how it might outcompete C. perfringens.' said Dr Arjan Narbad.

Previous studies had identified potential genes in L. johnsonii for producing EPS, giving the researchers tools to probe how the bacteria synthesise these molecules. Knocking out the whole cluster of EPS genes meant the bacteria produced no capsule. Further analysis of the genes by IFR PhD student Enes Dertli uncovered their poten
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Contact: Andrew Chapple
andrew.chapple@ifr.ac.uk
44-016-032-514-590
Norwich BioScience Institutes
Source:Eurekalert  

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