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Mäkelä, P. Helena (University of Helsinki, Helsinki, Finland). Genetic determination of the O antigens ofSalmonella groups B (4,5,12) and C1 (6,7). J. Bacteriol.91: 1115–1125. 1966.—The genetic determination of the O antigens ofSalmonella was studied by Hfr or F′ crosses between strains of groups B (antigens 4,5,12) and C1 (antigens 6,7). The main genetic determinants of the specificities 4 of group B and 7 of group C1 behaved as alleles of one locus, calledO orO–4/7 . This is probably identical withO–4/9 , responsible for the serological difference between groups B and D, and with the “rough” locusrouB . At least parts of the antigens 12 of group B and 62 of group C are determined at the same locus. The geneO–5 is closely linked toO–4/7 , both mapping in the approximately 2 minutes distance betweenhis andmetG in the orderhis - O–4/7 - O–5 - metG . In crosses of group B donors with group C1 recipients, a serologically new type, called semirough (SR), appeared in most recombinants that had inherited theO-4 allele of the group B donor. These SR forms are serologically intermediate between smooth and rough forms, showing poor stability in saline but possessing the specificities 4 and 12 and (some of them) 5. On the basis of previous biochemical studies, the hypothesis has been put forward that the side chains of their lipopolysaccharide are much shorter than normal group B side chains, probably containing only one repeating unit per side chain. A geneSR-4 responsible for the elongation of group B side chains beyond the first repeating unit was mapped betweengal andtry , group B and D bacteria beingSr-4 + , and group C beingSR-4 − .

Genetic Determination of the O Antigens of Salmonella Groups B (4,5,12) and C 1 (6,7)

Genetic Determination of the O Antigens of Salmonella Groups B (4,5,12) and C ₁ (6,7)