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1. (Article ID: 4122)
 
Tul'skaya EM, Shashkov AS, Streshinskaia GM, Senchenkova SN, Potekhina NV, Kozlova YI, Evtushenko LI
Teichuronic and teichulosonic acids of actinomycetes
Biochemistry (Moscow) 76(7) (2011) 736-744
 

The subject of the present review is the structural diversity and abundance of cell wall teichuronic and teichulosonic acids of representatives of the order Actinomycetales. Recently found teichulosonic acids are a new class of natural glycopolymers with ald-2-ulosonic acid residues: Kdn (3-deoxy-D-glycero-D-galacto-non-2-ulosonic acid) or di-N-acyl derivatives of Pse (5,7-diamino-3,5,7,9-tetradeoxy-L-glycero-L-manno-non-2-ulosonic or pseudaminic acid) as the obligatory component. The structures of teichuronic and teichulosonic acids are presented. Data are summarized on the occurrence of the glycopolymers of different nature in the cell wall of the studied actinomycetes. The biological role of the glycopolymers and their possible taxonomic implication are discussed. The comprehensive tables given in the Supplement show (13)C NMR spectroscopic data of teichuronic and teichulosonic acids obtained by the authors.

NMR spectroscopy, cell wall, teichuronic acid, actinomycetes, teichulosonic acid

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2. (Article ID: 4392)
 
Shashkov AS, Streshinskaia GM, Kozlova YI, Tul'skaya EM, Senchenkova SN, Arbatsky NP, Evtushenko LI
Teichulosonic acid, an anionic polymer of a new class from the cell wall of Actinoplanes utahensis VKM Ac-674T
Biochemistry (Moscow) 77(5) (2012) 511-517
 

The cell wall of Actinoplanes utahensis VKM Ac-674T contains two anionic polymers: teichoic acid 1,3-poly(glycerol phosphate) that is widespread in cell walls of Gram-positive bacteria; and a unique teichulosonic acid belonging to a new class of bioglycans described only in microorganisms of the Actinomycetales order. The latter polymer contains residues of di-N-acyl derivative of sialic acid-like monosaccharide - 5,7-diamino-3,5,7,9-tetradeoxy-L-glycero-b-L-manno-non-2-ulosonic or pseudaminic acid (Pse) which bears the N-(3,4-dihydroxybutanoyl) group (Dhb) at C7. This polymer has irregular structure and consists of fragments of two types, which differ in substitution of the Dhb residues at O4 either with b-D-glucopyranose or with b-Pse residues. Most of the b-Pse residues (~80%) are glycosylated at position 4 with a-D-galactopyranose residues in both types of fragments. The glucose, galactose, and Dhb residues are partly O-acetylated. The structures of the polymers were established by chemical and NMR spectroscopy methods.

NMR spectroscopy, cell wall, teichoic acids, anionic polysaccharides, Actinoplanes utahensis, teichulosonic acids

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