Published online 19 October 2005
Methods Online |
Proximity ligation assays with peptide conjugate burrs for the sensitive detection of spores
Section of Molecular Genetics and Microbiology, School of Biological Sciences, University of Texas at Austin Austin, TX 78712, USA 1Institute for Cell and Molecular Biology, University of Texas at Austin Austin, TX 78712, USA
*To whom correspondence should be addressed. Tel: + 1 512 471 6445; Fax: +1 512 471 7014; Email: mattlevy{at}mail.utexas.edu
Received April 15, 2005. Revised September 5, 2005. Accepted September 18, 2005.
The proximity ligation assay (PLA) has previously been used for the sensitive and specific detection of single proteins. In order to adapt PLA methods for the detection of cell surfaces, we have generated multivalent peptideoligonucleotidephycoerythrin conjugates (burrs) that can bind adjacent to one another on a cell surface and be ligated together to form unique amplicons. Real-time PCR detection of burr ligation events specifically identified as few as 100 Bacillus anthracis, 10 Bacillus subtilis and 1 Bacillus cereus spore. Burrs should prove to be generally useful for detecting and mapping interactions and distances between cell surface proteins.
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