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. 1994 Feb;176(3):848–860. doi: 10.1128/jb.176.3.848-860.1994

Isolation of two physiologically induced variant strains of Bacillus stearothermophilus NRS 2004/3a and characterization of their S-layer lattices.

M Sára 1, D Pum 1, S Küpcü 1, P Messner 1, U B Sleytr 1
PMCID: PMC205123  PMID: 8300538

Abstract

During growth of Bacillus stearothermophilus NRS 2004/3a in continuous culture on complex medium, the chemical properties of the S-layer glycoprotein and the characteristic oblique lattice were maintained only if glucose was used as the sole carbon source. With increased aeration, amino acids were also metabolized, accompanied by liberation of ammonium and by changes in the S-layer protein. Depending on the stage of fermentation at which oxygen limitation was relieved, two different variants, one with a more delicate oblique S-layer lattice (variant 3a/V1) and one with a square S-layer lattice (variant 3a/V2), were isolated. During the switch from the wild-type strain to a variant or from variant 3a/V2 to variant 3a/V1, monolayers of two types of S-layer lattices could be demonstrated on the surfaces of single cells. S-layer proteins from variants had different molecular sizes and a significantly lower carbohydrate content than S-layer proteins from the wild-type strain did. Although the S-layer lattices from the wild-type and variant strains showed quite different protein mass distributions in two- and three-dimensional reconstructions, neither the amino acid composition nor the pore size, as determined by permeability studies, was significantly changed. Peptide mapping and N-terminal sequencing results strongly indicated that the three S-layer proteins are encoded by different genes and are not derived from a universal precursor form.

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Selected References

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