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. 1987 Nov;169(11):5167–5173. doi: 10.1128/jb.169.11.5167-5173.1987

Cloning of the saliva-interacting protein gene from Streptococcus mutans.

P Sommer 1, T Bruyère 1, J A Ogier 1, J M Garnier 1, J M Jeltsch 1, J P Klein 1
PMCID: PMC213922  PMID: 2959652

Abstract

Genomic libraries from Streptococcus mutans OMZ175 were constructed in bacteriophage vectors. DNA fragments 1 to 2 kilobases in length were cloned in expression vector lambda gt11. S. mutans DNA fragments 15 to 20 kilobases in length were inserted in the BamHI site of phage EMBL3. Rabbit antiserum raised against an S. mutans saliva-interacting protein with a molecular weight of 74,000, designated 74K SR, was used to screen the lambda gt11 library. A recombinant phage carrying an S. mutans DNA sequence of 1.45 kilobases, lambda SmAD2, was detected and isolated. This fragment, named SmAD2, was used to construct the recombinant expression plasmid pSAD2-4 which encoded for the expression of a 60,000-molecular-weight protein controlled by the beta-galactosidase promoter from plasmid pUC8. The SmAD2 fragment and polyclonal anti-74K SR antibodies were used to screen the EMBL3 library. A total coincidence between the screening with antibodies and the DNA probe was observed, and two phages, lambda SmAD9 and lambda SmAD10, were isolated. They contained a common S. mutans DNA sequence of about 11.8 kilobases and coded for a protein with a molecular weight of about 195,000, which comigrated with a protein of an S. mutans cell wall extract. The expressed protein was purified, and a very strong relationship with the S. mutans 74K SR protein was found by competitive enzyme-linked immunosorbent assay. Thus, cloning of the 74K SR gene allowed us to demonstrate that the saliva receptor appears to be a part of an S. mutans precursor molecule with a molecular mass of 195,000 daltons.

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Selected References

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