Transport of N-acetyl-D-mannosamine and N-acetyl-D-glucosamine in Escherichia coli K1:: effect on capsular polysialic acid production

被引:15
作者
Revilla-Nuin, B [1 ]
Reglero, A [1 ]
Martínez-Blanco, H [1 ]
Bravo, IG [1 ]
Ferrero, MA [1 ]
Rodríguez-Aparicio, LB [1 ]
机构
[1] Univ Leon, Dept Bioquim & Biol Mol, E-24007 Leon, Spain
关键词
N-acetylmannosamine; N-acetylglucosamine; phosphotransferase system; sialic acid;
D O I
10.1016/S0014-5793(01)03318-X
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
N-Acetyl-D-mannosamine (ManNAc) and N-acetyl-D-glucosamine (GlcNAc) are the essential precursors of N-acetylneuraminic acid (NeuAc), the specific monomer of polysialic acid (PA), a bacterial pathogenic determinant. Escherichia coli K1 uses both amino sugars as carbon sources and uptake takes place through the mannose phosphotransferase system transporter, a phosphoenolpyruvate-dependent phosphotransferase system that shows a broad range of specificity. Glucose, mannose, fructose, and glucosamine strongly inhibited the transport of these amino-acetylated sugars and GlcNAc and ManNAc strongly affected ManNAc and GlcNAc uptake, respectively. The ManNAc and the GlcNAc phosphorylation that occurs during uptake affected NeuAc synthesis in vitro. These findings account for the low in vivo PA production observed when E. coli K1 uses ManNAc or GlcNAc as a carbon source for growth. (C) 2002 Federation of European Biochemical Societies. Published by Elsevier Science B.V. All rights reserved.
引用
收藏
页码:97 / 101
页数:5
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