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Applied and Environmental Microbiology, May 2000, p. 1911-1916, Vol. 66, No. 5
Department of Biology, The University,
D-78457 Konstanz,1 and Institute of
Biochemical Engineering, Saarland University, D-66041
Saarbrücken,2 Germany
Received 16 November 1999/Accepted 22 February 2000
The surfactant linear alkylbenzenesulfonate (LAS; 0.5 mM) or linear
monoalkyldiphenyletherdisulfonate (LADPEDS; 0.5 mM) in salts medium was
easily degraded in laboratory trickling filters, whereas
carbon-limited, aerobic enrichment cultures in suspended culture with
the same inocula did not grow. We took portions of the
trickling filters which degraded LADPEDS, shook the organisms from the
solid support (polyester), and found that growth in suspended culture
in LADPEDS-salts medium occurred only in the presence of some solid
support (polyester fleece or glass wool), though little biomass was
immobilized on the support. The end products in suspended culture were
identical with those from the trickling filters. There was low
plating efficiency of LADPEDS-grown cultures on complex
medium, and no picked colony or mixture of colonies grew in
LADPEDS-salts-glass wool medium. However, selective plates containing
LADPEDS-salts medium solidified with agarose yielded LADPEDS-dependent,
pinpoint colonies which could be picked singly and subcultured in
selective liquid medium. Isolate DS-1 was a bacterium which showed 93%
sequence homology (16S ribosomal DNA) to its nearest phylogenetic
neighbor, an
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
An
-Proteobacterium Converts Linear
Alkylbenzenesulfonate Surfactants into Sulfophenylcarboxylates and
Linear Alkyldiphenyletherdisulfonate Surfactants into
Sulfodiphenylethercarboxylates

-proteobacterium. Strain DS-1 grew heterotrophically in
LADPEDS-salts-glass wool medium and converted the set of
aryl-substituted alkanes to the corresponding aryl-substituted
carboxylic acids of shorter chain length. Similarly, strain DS-1
grew heterotrophically with commercial LAS, converting it to a
set of sulfophenylcarboxylates. Growth with a single isomer of LAS
[3-(4-sulfophenyl)dodecane] was concomitant with excretion of
4-(4-sulfophenyl)hexanoate, which was identified by matrix-assisted laser desorption ionization mass spectrometry. The growth yield (6.4 g
of protein/mol of C) indicated mass balance, which, with the specific
growth rate (0.05 h
1), indicated a specific utilization
rate of LAS of 2.2 mkat/kg of protein.
*
Corresponding author. Mailing address: Department of
Biology, University of Konstanz, Universitätstr. 10, D-78457
Konstanz, Germany. Phone: 0049 7531 88 42 47. Fax: 0049 7531 88 29 66. E-mail: Alasdair.Cook{at}uni-konstanz.de.
Present address: Department of Environmental Science and
Engineering, Fudan University, Shanghai, China.
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