Tuffal G, Ponthus C, Picard C, Rivière M, Puzo G. Structural elucidation of novel methylglucose-containing polysaccharides from Mycobacterium xenopi.
EUROPEAN JOURNAL OF BIOCHEMISTRY 1995;
233:377-83. [PMID:
7588770 DOI:
10.1111/j.1432-1033.1995.377_1.x]
[Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The structures of methylglucose-containing polysaccharides (MeGlc PS) from Mycobacterium xenopi were investigated using high-pH anion-exchange chromatography and liquid secondary-ion mass spectrometry. We report the structure of two novel MeGlc PS, referred to as A and B. MeGlc PS A is composed of 16 D-glucopyranose residues, 11 of which are methylated, and MeGlc PS B contains 15 D-glucopyranose residues, 10 of which are methylated. The main structural feature of both MeGlc PS A and B, compared to the previously described structures, is the absence of the tetrasaccharide non-reducing end 3-O-Me-D-Glcp-[alpha(1-->4)-D-Glcp]3. The MeGlc PS A structure is similar to the synthetic polysaccharide [Saïer, M. H. & Ballou, C. E. (1968) J. Biol. Chem. 243, 992-1005], having a lower affinity for fatty acids than the MeGlc PS of Mycobacterium smegmatis [Kiho, T. & Ballou, C. E. (1988) Biochemistry 27, 5824-5828]. Thus, the occurrence of MeGlc PS A and the consequences on the regulation of fatty acid synthetase I activity involved in the biosynthesis of fatty acids, precursors of mycolic acid biosynthesis, is discussed.
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