Abstract:
:The secreted pore-forming toxin listeriolysin O (LLO) is an essential virulence factor that allows the food-borne bacterial pathogen Listeria monocytogenes to escape from the phagocytic vacuole and reach the host cytosol. This protein belongs to the group of cholesterol-binding sulfhydryl-activated toxins, expressed by a large number of Gram-positive bacteria. A protocol for large-scale expression and purification of recombinant LLO was previously optimized. By a simple two-step purification method, we achieved a high-level LLO synthesis (4.5 mg l(-1) of cell culture) in a hemolytically active form (1.2 x 10(6) HU mg(-1) of protein). This procedure can solve the problem of LLO isolation from L. monocytogenes cultures which is a difficult task, mainly owing to the low levels of toxin released in the culture media. Here we report the characterization of toxin properties and its preliminary application in an ELISA diagnostic test for listeriosis.
journal_name
J Biotechnoljournal_title
Journal of biotechnologyauthors
Giammarini C,Andreoni F,Amagliani G,Casiere A,Barocci S,Magnani Mdoi
10.1016/j.jbiotec.2003.10.023subject
Has Abstractpub_date
2004-04-08 00:00:00pages
13-20issue
1-2eissn
0168-1656issn
1873-4863pii
S0168165604000215journal_volume
109pub_type
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