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. 1990 Jun;58(6):1614–1619. doi: 10.1128/iai.58.6.1614-1619.1990

Identification of a bacteriophage containing a silent staphylococcal variant enterotoxin gene (sezA+).

M T Soltis 1, J J Mekalanos 1, M J Betley 1
PMCID: PMC258687  PMID: 2140340

Abstract

A variant enterotoxin gene, referred to as sezA+, has been identified. Staphylococcus aureus FRI1106, a staphylococcal enterotoxin type D producer (Sed+), contained HindIII fragments of 3.8 and 9.4 kilobase pairs (kbp) that hybridized in Southern blot analysis to a probe containing only staphylococcal enterotoxin type A structural gene sequences. Presumably, probe A-624 hybridized to the 9.4-kbp HindIII fragment because of the sequence homology between sea+ and sed+. This 9.4-kbp HindIII fragment, which was part of a staphylococcal plasmid, was isolated and ligated into an Escherichia coli plasmid vector; Sed+ E. coli recombinant clones were isolated. The 3.8-kbp HindIII fragment was shown to be part of a viable lysogenic bacteriophage, and it contained sezA+. This sezA(+)-containing fragment was cloned into E. coli, and its DNA sequence was determined. Examination of the nucleotide sequence revealed a 771-bp region that contained an open reading frame with 85 and 77% nucleotide and derived amino acid sequence identifies with sea+ and staphylococcal enterotoxin type A, respectively. This open reading frame has 83 to 50% nucleotide sequence identities with the other types of staphylococcal enterotoxin genes. sezA+ was shown to be transcribed into stable mRNA. However, the sezA+ mRNA was not translated into an enterotoxinlike protein because it lacks an appropriate translation initiation codon.

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Selected References

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