Simplified low-cost production of O-antigen from Salmonella Typhimurium Generalized Modules for Membrane Antigens (GMMA).

Abstract

The Novartis Vaccines Institute for Global Health is developing vaccines using outer membrane particles, known as Generalized Modules for Membrane Antigens (GMMA). These are blebs of outer membrane and periplasm, shed from the surface of living Gram-negative bacteria following the targeted deletion of proteins involved in maintaining the integrity of the inner and outer membranes. The current study investigates the use of GMMA as starting material for extraction of membrane components, focusing on the O-antigen polysaccharide portion of lipopolysaccharide from Salmonella Typhimurium. We show that the amount of O-antigen extracted from GMMA by acid hydrolysis is comparable to the quantity extracted from whole wild type bacteria, but with less protein and DNA contaminants. Compared to conventional purification, GMMA enabled a reduction in the number of purification steps required to obtain the O-antigen polysaccharide with the same purity. Purification processes from GMMA and bacteria were characterised by similar final yields. Use of GMMA as starting material provides the possibility to simplify the purification process of O-antigen, with a consequent decrease in manufacturing costs of O-antigen-based glyconjugate vaccines against Salmonella strains and potentially other Gram-negative bacteria.

• Authors: Eleonora Meloni, Anna Maria Colucci, Francesca Micoli, Luigi Sollai, Massimiliano Gavini, Allan Saul, Vito Di Cioccio, Calman A MacLennan
• Journal: Journal of biotechnology (J Biotechnol) Vol. 198 Pg. 46-52 (Mar 20 2015) ISSN: 1873-4863 [Electronic] Netherlands
• PMID: 25659926 (Publication Type: Journal Article)
• Copyright: Copyright © 2015 The Authors. Published by Elsevier B.V. All rights reserved.

Chemical References

• Lipopolysaccharides
• O Antigens
• Vaccines

Topics

• Hydrolysis
• Lipopolysaccharides (chemistry, metabolism)
• Membranes (chemistry, metabolism)
• O Antigens (chemistry, isolation & purification, metabolism)
• Salmonella typhimurium (chemistry, metabolism)
• Vaccines (chemistry)