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J Bacteriol, June 1998, p. 2950-2957, Vol. 180, No. 11
Institut für Biochemie, Medizinische
Fakultät, Universität Erlangen-Nürnberg, D-91054
Erlangen, Germany
Received 29 December 1997/Accepted 24 March 1998
Motile group N streptococci, classified as Vagococcus
fluvialis, have been isolated from cows' udders, human and
animal feces, river water, and seawater. They possess an unusual
membrane lipid and fatty acid pattern. We isolated and characterized 13 polar lipids, 8 of them also found in other gram-positive bacteria: mono- and dihexosyldiacylglycerol, an acylated and a
glycerophosphate-substituted derivative of the latter, cardiolipin,
phosphatidylglycerol, D-alanylphosphatidylglycerol, and
L-lysylphosphatidylglycerol. Besides them, we characterized two rare compounds, bis(acylglycero)phosphate and
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
D-Alanylcardiolipin, a Major Component
of the Unique Lipid Pattern of Vagococcus
fluvialis
-D-glucopyranosylcardiolipin, and two compounds so far
not detected in nature, D-alanylbis(acylglycero)phosphate and D-alanylcardiolipin. The concomitant occurrence of four
aminoacyl phospholipids in one organism is another unique finding.
Substituted cardiolipins represent a novel lipid class: in vagococci,
D-alanylcardiolipin is a major membrane lipid component,
contributing 11 and 26 mol% of total lipids in the exponential and
stationary phases of growth, respectively. The vagococcal lipids
contain even-numbered straight-chain saturated and
cis-monounsaturated fatty acids, but the
cis-monoenic acids belong to the
-9 series and not the
-7 series, found in enterococci, lactococci, and streptococci.
*
Corresponding author. Mailing address: Institut
Biochemie, Fahrstrasse 17, D-91054 Erlangen, Germany. Phone: 49 (0)
911-40 59 57. Fax: 49 (0) 9131-85 4605. E-mail:
w.fischer{at}biochem.uni-erlangen.de.
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