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A protein of unusual composition from Enterococcus faecium.

In screening a genomic bank of Enterococcus faecium for an ATPase (1), we inadvertently cloned the gene for a protein, P54, that crossreacted with our antibody. The DNA sequence and, below it, the protein sequence derived from the gene are shown. A putative promotor (276-282), ribosome binding site (296-301) and TATA-box (316-321) have been assigned. The open reading frame extends from position 330 to 1850. The resultant protein product has a calculated molecular mass of 53,572 and possesses a highly unusual sequence. It is expressed in Escherichia coli as well as in E. faecium. In the latter organism, it can be detected immunologically in cell wall preparations. P54 exhibits low homology to M-proteins of group A streptococci (2). Common to the M-proteins and P54 are multiple direct repeats in the DNA and protein sequences.