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. 1975 Aug;123(2):642–650. doi: 10.1128/jb.123.2.642-650.1975

Physical and chemical studies of Thiobacillus ferroxidans lipopolysaccharides.

W E Hirt, J R Vestal
PMCID: PMC235771  PMID: 238956

Abstract

The lipopolysaccharides (LPS) of the obligate acidophile Thiobacillus ferroxidans grown on iron, sulfur, and glucose as energy sources were examined for various physical and chemical properties. Both qualitative and quantitative variation were found among the three preparations. The LPS extracted from iron-grown cells (Fe-LPS) contained less than 3% protein compared to 18 to 25% in LPS extracted from either sulfur-grown cells (S-LPS) or glucose-grown cells (G-LPS). S-LPS showed two distinct sedimentable species, 61S and 9.3S, which could be fractionated on a column of Sepharose 4B. The relative densities of both S-LPS and G-LPS were found to be significantly greater than that of Fe-LPS. Spectral differences were noted when each LPS was reacted with a carbocyanine dye. Fe-LPS showed a single absorbance maximum at 472 nm, S-LPS displayed its maximum at 650 nm, and G-LPS showed two maxima, the first at 468 nm and the other at 655 nm. Analysis of the methyl ester derivatives of the LPS fatty aicds using gas chromatography-mass spectrometry revealed the presence of a very stable species, tentatively identified as a methoxy methyl ester with a formula of CH3-3-C10H10-COOCH3, as the major component from each LPS. beta-Hydroxymyristic acid was found only in Fe-LPS.

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Selected References

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