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J. Bacteriol., 09 1995, 4947-4962, Vol 177, No. 17
Copyright © 1995, American Society for Microbiology

Structure of peptidoglycan from Thermus thermophilus HB8

JC Quintela, E Pittenauer, G Allmaier, V Aran and MA de Pedro
Centro de Biologia Molecular Severo Ochoa Consejo Superior de Investigaciones Cientificas-Universidad Autonoma de Madrid, Facultad de Ciencias, Campus de Cantoblanco, Madrid, Spain.

The composition and structure of peptidoglycan (murein) extracted from the extreme thermophilic eubacterium Thermus thermophilus HB8 are presented. The structure of 29 muropeptides, accounting for more than 85% of total murein, is reported. The basic monomeric subunit consists of N-acetylglucosamine-N-acetylmuramic acid-L-Ala-D-Glu-L-Orn-D-Ala-D- Ala, acylated at the delta-NH2 group of Orn by a Gly-Gly dipeptide. In a significant proportion (about 23%) of total muropeptides, the N- terminal Gly is substituted by a residue of phenylacetic acid. This is the first time phenylacetic acid is described as a component of bacterial murein. Possible implications for murein physiology and biosynthesis are discussed. Murein cross-linking is mediated by D-Ala- Gly-Gly peptide cross-bridges. Glycan chains are apparently terminated by (1-->6) anhydro N-acetylmuramic acid residues. Neither reducing sugars nor murein-bound macromolecules were detected. Murein from T. thermophilus presents an intermediate complexity between those of gram- positive and gram-negative organisms. The murein composition and peptide cross-bridges of T. thermophilus are typical for a gram- positive bacterium. However, the murein content, degree of cross- linkage, and glycan chain length for T. thermophilus are closer to those for gram-negative organisms and could explain the gram-negative character of Thermus spp.


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