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. 1985 May;162(2):728–737. doi: 10.1128/jb.162.2.728-737.1985

Unusual stability of the Methanospirillum hungatei sheath.

T J Beveridge, M Stewart, R J Doyle, G D Sprott
PMCID: PMC218911  PMID: 3988711

Abstract

The proteinaceous sheath of Methanospirillum hungatei was isolated by lysing cells in 50 mM dithiothreitol, separating the sheath from other cellular material by discontinuous sucrose density centrifugation, and removing the "cell spacers" with dilute NaOH. The isolated sheath material consisted of hollow tubes which had a highly ordered surface array. The stability of the sheath to treatment with denaturants and to enzymatic digestion was examined by a turbidimetric assay in conjunction with electron microscopy and optical or electron diffraction. The sheath was resistant to a range of proteases and also was not digested by peptidoglycan-degrading enzymes, a lipase, a cellulase, a glucosidase, or Rhozyme (a mixture of galactosidases, acetylglucosaminidase, acetylgalactosaminidase, fucosidase, and mannosidases). In addition to being unaffected by common salts, thiol-reducing agents, and EDTA, the layer was resistant to powerful denaturants such as 6 M urea, 6 M guanidinium hydrochloride, 10 M LiSCN, cyanogen bromide, sodium periodate, and 1% sodium dodecyl sulfate. Strong bases, boiling 3 N HCl, and performic acid did attack the sheath; in these cases, the array was systematically disassembled in a progressive manner, which was followed by electron microscopy. The layer was slightly modified by N-bromosuccinimide in urea, but the array remained intact. The stability of the sheath was remarkable, not only as compared to other bacterial surface arrays, but also as compared to proteins generally, and possibly indicated the presence of covalent cross-links between protein subunits.

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