Enhanced phagocytosis and complement-mediated killing of
Mannheimia haemolytica serotype 1 following in-frame CMP-sialic acid synthetase (
neuA) gene deletion.
Microbiol Spectr 2023;
11:e0294423. [PMID:
37850751 PMCID:
PMC10714724 DOI:
10.1128/spectrum.02944-23]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Accepted: 09/06/2023] [Indexed: 10/19/2023] Open
Abstract
IMPORTANCE
The Gram-negative coccobacillus Mannheimia haemolytica is a natural inhabitant of the upper respiratory tract in ruminants and the most common bacterial agent involved in bovine respiratory disease complex development. Key virulence factors harbored by M. haemolytica are leukotoxin, lipopolysaccharide, capsule, adhesins, and neuraminidase which are involved in evading innate and adaptive immune responses. In this study, we have shown that CMP-sialic acid synthetase (neuA) is necessary for the incorporation of sialic acid onto the membrane, and inactivation of neuA results in increased phagocytosis and complement-mediated killing of M. haemolytica, thus demonstrating that sialylation contributes to the virulence of M. haemolytica.
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