Abstract
A 1020-bp open reading frame (ORF) was found immediately downstream of the ompH gene of Salmonella typhimurium. This ORF (ORF-36) encodes a moderately hydrophobic protein with 341 amino acid residues (calculated molecular mass, 35,928 Da). The ORF-36 product was detected in minicells. Downstream of ORF-36, another ORF was found. It is highly homologous to the E. coli ORF (ORF-17.4) which precedes the lpx-genes involved in lipid A biosynthesis. ORF-36 is probably analogous to the firA gene of E. coli, the sequence of which has not yet been published. Thus it appears that the enterobacterial ompH and lpx genes are separated only by the ORF-36 and ORF-17.4 genes. We also discuss the data on the function of the ORF-36 protein. On this basis, we suggest that the protein could be called the Ssc protein.
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