Characterization of Vibrio Cholerae O1 Antigen As the Bacteriophage K139 Receptor and Identification of IS1004 Insertions Aborting O1 Antigen Biosynthesis
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Bacteriophage K139 was recently characterized as a temperate phage of O1 Vibrio cholerae. In this study we have determined the phage adsorption site on the bacterial cell surface. Phage-binding studies with purified lipopolysaccharide (LPS) of different O1 serotypes and biotypes revealed that the O1 antigen serves as the phage receptor. In addition, phage-resistant O1 El Tor strains were screened by using a virulent isolate of phage K139. Analysis of the LPS of such spontaneous phage-resistant mutants revealed that most of them synthesize incomplete LPS molecules, composed of either defective O1 antigen or core oligosaccharide. By applying phage-binding studies, it was possible to distinguish between receptor mutants and mutations which probably caused abortion of later steps of phage infection. Furthermore, we investigated the genetic nature of O1-negative strains by Southern hybridization with probes specific for the O antigen biosynthesis cluster (rfb region). Two of the investigated O1 antigen-negative mutants revealed insertions of element IS1004 into the rfb gene cluster. Treating one wbeW::IS1004 serum-sensitive mutant with normal human serum, we found that several survivors showed precise excision of IS1004, restoring O antigen biosynthesis and serum resistance. Investigation of clinical isolates by screening for phage resistance and performing LPS analysis of nonlysogenic strains led to the identification of a strain with decreased O1 antigen presentation. This strain had a significant reduction in its ability to colonize the mouse small intestine.
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Knecht L, Born Y, Pelludat C, Pothier J, Smits T, Loessner M Front Microbiol. 2022; 13:908346.
PMID: 35979490 PMC: 9376448. DOI: 10.3389/fmicb.2022.908346.
Li N, Zeng Y, Hu B, Zhu T, Svenningsen S, Middelboe M Viruses. 2021; 13(12).
PMID: 34960610 PMC: 8706939. DOI: 10.3390/v13122342.
Clark M, Paxhia M, Young J, Manzella M, Reguera G Appl Environ Microbiol. 2021; 87(20):e0096421.
PMID: 34347518 PMC: 8478458. DOI: 10.1128/AEM.00964-21.
Cohan F, Zandi M, Turner P Virus Evol. 2020; 6(2):veaa060.
PMID: 33365149 PMC: 7744382. DOI: 10.1093/ve/veaa060.