Difference between revisions of "Part:BBa K299811"

Revision as of 19:11, 26 October 2010

This part is licensed under
Creative BioCommons

Listeriolysin O is a member of a widespread cholesterol-dependent pore-forming cytolysins family (CDCs). It's natural role in Listeria monocytogenes is to provide endosomal escape. The first step of the process involves binding of monomeric listeriolysin molecules to lipid bilayer containing cholesterol. The binding induces conformational change that subsequently leads to the formation of a prepores' oligomeric structures (consisting of 33-50 monomers) converting into large (maximum 350A-diameter) pores. This severely disturbs the stability of endosomal membrane and causes it’s rupture.

LLO is a phagosome-specyfic lysin. The acidic pH is necessary for it’s full hemolytic activity. Neutral pH of cytosol causes premature unfolding of TMH domains responsible for aqueous pore formation. This mechanism prevents Listeria spp from killing the host cell and losing the intracellular environment. In case of any tranformed strain it guarantees the lowest possible level of cytotoxicity, incomparable to this involved with the use of any other protein from CDCs family.

model LLO
Structural model of the LLO monomer from: P. Schnupf , D.A. Portnoy Listeriolysin O: a phagosome-specific lysin, Microbes and infection (2007) 1176-1187

Authors:
Cloned by Marta Błaszkiewicz under supervision of Michał Lower.

Construct design
The part consists of B0032 RBS followed by synthetic listeriolysin gene originally from Listeria monocytogenes. The construct is a fragment of the Invasiveness Operon (Bba_K299813 and BBa_K299815) To find out more about it's background and design click here.

Safety
All safety precautions must be taken when manipulating with transformed strain. It involves obligatory use of laboratory gloves. Work under laminar is strongly advised. All waste should be autoclaved to avoid accidental gene transfer to other bacteria and potential rise of pathogenic organism.

Sequence and Features