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. 1991 Sep;173(17):5346–5351. doi: 10.1128/jb.173.17.5346-5351.1991

Cloning and expression in Escherichia coli of the structural gene coding for the monomeric protein of the S layer of Thermus thermophilus HB8.

M L Faraldo 1, M A de Pedro 1, J Berenguer 1
PMCID: PMC208244  PMID: 1885515

Abstract

The gene coding for the 100 kDa monomeric protein (P100) of the S layer of Thermus thermophilus HB8 has been cloned in the Escherichia coli plasmid vector pUC9. Recombinant plasmids were selected by colony screening with anti-P100 rabbit antiserum. The gene, named slpA (for surface layer protein A), was identified in a bacterial clone harboring a hybrid plasmid, pMF4, with a 5.8-kbp insert. This plasmid consistently expressed a protein specifically recognized by anti-P100 antiserum. Expression was apparently independent of Plac, indicating that the promoter for P100 is functional in E. coli. Most E. coli strains transformed with plasmids containing the 5.8-kbp insert cloned in pMF4 expressed two proteins with apparent masses of 52 and 50 kDa, which were strongly recognized by anti-P100 antiserum in Western immunoblots. The 52-kDa fragment could be overproduced, and the sequence of the N-terminal undecapeptide, determined by microsequencing, indicated that it could correspond to the N-terminal domain of P100. Expression of slpA in lon mutants of E. coli led to accumulation of a protein indistinguishable from native P100, indicating that the complete gene was cloned and that the product of lon, protease La, was involved in proteolytic degradation of P100 synthesized in E. coli.

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Selected References

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