Sialic acid uptake is necessary for virulence of Pasteurella multocida in turkeys.
Many pathogenic bacteria employ systems to incorporate sialic acid into their membranes as a means of protection against host defense mechanisms. In Pasteurella multocida, an opportunistic pathogen which causes diseases of economic importance in a wide range of animal species, sialic acid uptake plays a role in a mouse model of systemic pasteurellosis. To further investigate the importance of sialic acid uptake in pathogenesis, sialic acid uptake mutants of an avian strain of P. multocida P-1059 (A:3) were constructed, characterized, and an in-frame sialic acid uptake deletion mutant was assessed for virulence in turkeys. Inactivation of sialic acid uptake resulted in a high degree of attenuation when turkeys were challenged either intranasally or intravenously. Resistance of the sialic acid uptake mutant to killing by turkey serum complement was similar to that of the parent, suggesting other mechanisms are responsible for attenuation of virulence in turkeys.
US Department of Agriculture, Respiratory Diseases of Livestock Unit, National Animal Disease Center, Agricultural Research Service, Ames, IA 50010, USA.
Fred M
FM
Tatum
Louisa B
LB
Tabatabai
Robert E
RE
Briggs
D000818:Animals; D019158:N-Acetylneuraminic Acid / Q000276:immunology*; D010326:Pasteurella Infections / Q000276:immunology / Q000382:microbiology / Q000662:veterinary*; D016979:Pasteurella multocida / Q000235:genetics / Q000276:immunology / Q000472:pathogenicity*; D011201:Poultry Diseases / Q000276:immunology / Q000382:microbiology*; D014422:Turkeys; D014774:Virulence
D019158:N-Acetylneuraminic Acid