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. 1986 Jun;166(3):1046–1054. doi: 10.1128/jb.166.3.1046-1054.1986

Ultrastructure of the cell envelope of the archaebacteria Thermoproteus tenax and Thermoproteus neutrophilus.

P Messner, D Pum, M Sára, K O Stetter, U B Sleytr
PMCID: PMC215230  PMID: 3086286

Abstract

The ultrastructures of the regular surface layers (S-layers) of the extremely thermophilic archaebacteria Thermoproteus tenax and Thermoproteus neutrophilus were examined by freeze-etching, freeze-drying, and negative staining methods combined with optical and digital image enhancement. In both strains, a monolayer of macromolecules arranged in hexagonal arrays with center-to-center spacings of approximately 30 nm was the only component of the cell wall. The gross morphologies of the S-layer lattices of the two organisms were similar and showed the same handedness in the arrangement of the protomers of the morphological units. Striking differences were found in the anionic charge distributions on the surfaces of the two S-layer proteins as determined by labeling with polycationic ferritin. Analysis of the lattice orientation, together with the number and distribution of lattice faults on intact cells, provided a strong indication that the S-layers of both organisms have a shape-determining function.

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