Ultrastructural organization of Alicyclobacillus tolerans strain K1T cells |
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Authors: | Vitalii I Duda Natalya E Suzina Lyudmila O Severina Tatyana I Bogdanova Iraida A Tsaplina Gregorii I Karavaiko |
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Institution: | (1) Laboratory for structural and functional adaptation of microorganisms, G. K. Skryabin Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Sciences, Prospect Nauki 5, 142290 Pushchino, Moscow Region, Russia;(2) Laboratory of chemolithotrophic microorganisms, S. N. Winogradsky Institute of Microbiology, Russian Academy of Sciences, Prospect 60-let. Oktyabrya 7/2, 117312 Moscow, Russia |
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Abstract: | Electron microscopy examinations of thin sections and freeze-fracture replicas revealed the specific ultrastructural features of Alicyclobacillus tolerans strain K1(T). In particular, the cell wall displayed an ultrastructure typical of gram-positive bacteria and consisted of a thin murein layer (50-60 A in thickness); cells exhibited a surface S-layer constituted by large hexagonally packed (p6-symmetry) rod-shaped subunits of 150-160 A in diameter and 200 A in height. In the cytoplasmic membrane, there were intramembrane vesicular structures that sometimes appeared as large leaflets in the central part. The cytoplasm contained numerous vesicular inclusions covered with a monolayered wall, dissimilar to bilamellar lipid membranes. Endospore coats displayed an intricate structure and consisted of three thick layers; the outer layer had an unusual fine structure; the exosporium was also found. |
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Keywords: | Ultrastructure Cell wall S-layer Membrane Endospore coats |
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