Novartis Ag

Glaxosmithkline Biologicals Sa

J. Craig Venter Institute

Novartis Vaccines and Diagnostics Srl

Davide Serruto

Mariagrazia Pizza

Rino Rappuoli

Maria Scarselli

Claire M Fraser

Isabel Delany

Hervé Tettelin

Maria Aricò

Isobel Delany

A first aspect of the invention provides meningococcal outer membrane vesicles in which NHBA is over-expressed. A second aspect of the invention provides meningococcal outer membrane vesicles in which NadA is over-expressed. A third aspect of the invention provides a panel of bacterial strains, each member of which is isogenic except for a single gene which in each strain encodes a different variant antigen of interest.

Developments in meningococcal outer membrane vesicles

A first aspect of the invention provides meningococcal outer membrane vesicles in which NHBA is over-expressed. A second aspect of the invention provides meningococcal outer membrane vesicles in which NadA is over-expressed. A third aspect of the invention provides a panel of bacterial strains, each member of which is isogenic except for a single gene which in each strain encodes a different variant of an antigen of interest.

Various specific meningococcal proteins are disclosed. The invention provides related polypeptides, nucleic acids, antibodies and methods. These can all be used in medicine for treating or preventing disease and/or infection caused by meningococcus, such as bacterial meningitis.

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Meningococcal antigens are cleaved by human lactoferrin. The invention is based on the identification of the cleavage products of this reaction, and provides a method for cleaving a neisserial polypeptide, comprising the step of mixing the polypeptide with a lactoferrin enzyme. The invention also provides polypeptides obtainable by this process (i.e. the cleavage products of the lactoferrin digestion). Proteins of particular interest are meningococcal proteins 287 and App.

Lactoferrin cleavage of neisserial proteins

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Siena, Italy

Davide Serruto