Detection of quorum sensing molecules in Burkholderia cepacia culture supernatants with enzyme-linked immunosorbent assays View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2010-11

AUTHORS

Xiao Chen, Katharina Buddrus-Schiemann, Michael Rothballer, Petra M. Krämer, Anton Hartmann

ABSTRACT

The Burkholderia cepacia complex (Bcc) employs a quorum sensing (QS) mechanism which is a cell density-dependent bacterial communication system to regulate certain gene expressions. As with many other Gram-negative bacteria, Burkholderia cepacia species use (N-acyl-)homoserine lactones (AHLs or HSLs) as signalling molecules. Because of the essential role of QS in bacterial behavior, the aim of this study was to demonstrate the applicability of our in-house-developed enzyme-linked immunosorbent assays (ELISAs) for the detection of bacterial activities via HSLs in B. cepacia strain LA3 culture supernatants. For this purpose the previously developed monoclonal antibodies (mAbs) HSL1/2-2C10 and HSL1/2-4H5 were exploited. N-3-Oxo-decanoyl-L-homoserine lactone (3-oxo-C10-HSL) was used as main analyte throughout all experiments. With the bacterial culture medium (named ABC medium) a matrix effect in both ELISAs was visible (slight increase in optical density, shift in test midpoints (IC(50)) and working ranges). For example, ELISA with mAb HSL1/2-2C10 and enzyme tracer HSL3-HRP (HSL derivative conjugated to horseradish peroxidase) had an IC(50) of 120 μg L(-1) for 3-oxo-C10-HSL in phosphate-buffered saline versus 372 μg L(-1) in ABC medium. A significant increase of HSLs in B. cepacia strain LA3 culture supernatants after 12 h to 48 h of growth was observed. Although the analytical result of these immunoassays cannot distinguish HSLs from homoserines (HSs), the appearance of these compounds can be easily followed. Hydrolysis and spiking experiments were carried out with these biological samples. According to our knowledge, these are the first immunoassays for the detection of quorum sensing molecules in biological culture supernatants. This study provides a cost-effective, fast, and sensitive analytical method for detection of HSLs/HSs in biological samples without complex sample preparation and will offer a quick idea about B. cepacia activities. The low sample amount requirement (less than 1 mL) constitutes a tremendous advantage for many analytical questions with biological samples. More... »

PAGES

2669-2676

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00216-010-4045-5

DOI

http://dx.doi.org/10.1007/s00216-010-4045-5

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1025235864

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/20694722


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