A Rhizobium leguminosarum AcpXL Mutant Produces Lipopolysaccharide Lacking 27-Hydroxyoctacosanoic Acid
A Rhizobium leguminosarum AcpXL Mutant Produces Lipopolysaccharide Lacking 27-Hydroxyoctacosanoic Acid
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豆根瘤菌 AcpXL 突变体产生缺乏 27-羟基二十八烷酸的脂多糖
作者:
Vinata Vedam;E. Kannenberg;E. Kannenberg;J. G. Haynes;D. Sherrier;A. Datta;R. Carlson
ABSTRACT The structure of the lipid A from Rhizobium etli and Rhizobium leguminosarum lipopolysaccharides (LPSs) lacks phosphate and contains a galacturonosyl residue at its 4′ position, an acylated 2-aminogluconate in place of the proximal glucosamine, and a very long chain ω-1 hydroxy fatty acid, 27-hydroxyoctacosanoic acid (27OHC28:0). The 27OHC28:0 moiety is common in lipid A's among members of the Rhizobiaceae and also among a number of the facultative intracellular pathogens that form chronic infections, e.g., Brucella abortus, Bartonella henselae, and Legionella pneumophila. In this paper, a mutant of R. leguminosarum was created by placing a kanamycin resistance cassette within acpXL, the gene which encodes the acyl carrier protein for 27OHC28:0. The result was an LPS containing a tetraacylated lipid A lacking 27OHC28:0. A small amount of the mutant lipid A may contain an added palmitic acid residue. The mutant is sensitive to changes in osmolarity and an increase in acidity, growth conditions that likely occur in the nodule microenvironment. In spite of the probably hostile microenvironment of the nodule, the acpXL mutant is still able to form nitrogen-fixing root nodules even though the appearance and development of nodules are delayed. Therefore, it is possible that the acpXL mutant has a host-inducible mechanism which enables it to adapt to these physiological changes.
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影响因子:
4.3
作者:
Ridley,BL;Jeyaretnam,BS;Carlson,RW
通讯作者:
Carlson,RW
DOI:
10.1099/00207713-41-2-213
发表时间:
1991
期刊:
International journal of systematic bacteriology
影响因子:
--
作者:
Bhat,UR;Carlson,RW;Busch,M;Mayer,H
通讯作者:
Mayer,H
DOI:
10.1074/jbc.m004009200
发表时间:
2000
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Que,NL;Ribeiro,AA;Raetz,CR
通讯作者:
Raetz,CR
影响因子:
2.7
作者:
Michael E. Kovach;R. Phillips;P. Elzer;R. Roop;K. Peterson
通讯作者:
Michael E. Kovach;R. Phillips;P. Elzer;R. Roop;K. Peterson
DOI:
--
发表时间:
1994-05
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
U. R. Bhat;L. S. Forsberg;R. W. Carlson
通讯作者:
U. R. Bhat;L. S. Forsberg;R. W. Carlson