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  Dimethylsulfoniopropionate production in phototrophic organisms and its physiological function as a cryoprotectant
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Karsten_1996.pdf (Publisher version), 2MB
 
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 Creators:
Karsten, Ulf1, Author           
Kuck, K, Author
Vogt, C, Author
Kirst, GO, Author
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1Permanent Research Group Microsensor, Max Planck Institute for Marine Microbiology, Max Planck Society, Celsiusstraße 1, 28359 Bremen, DE, ou_2481711              

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 Abstract: Dimethylsulfoniopropionate (DMSP) was detected in many strains of prototrophic bacteria and cyanobacteria. These data, together with results from earlier studies and the literature, clearly indicate that mainly photosynthetic micro- and macroorganisms have the metabolic capability to synthesize this compound. A relationship with temperature has also been identified. Polar macroalgae contain significantly higher DMSP contents compared to temperate or tropical species (5, 17). In this study, the cryoprotective function of DMSP was investigated on the activity of the model enzyme lactate dehydrogenase (LDH) as well as on that of malate dehydrogenase (MDH), extracted from the polar alga Acrosiphonia arcta (Chlorophyta). LDH activity was stabilized during freezing and thawing by the presence of DMSP concentrations up to 230 mM. The addition of higher amounts of DMSP to the enzyme assay even led to a 1.5 fold stimulation in the activity. DMSP stabilized MDH activity at the extremely low temperature of -2°C. In the presence of high solute concentrations, up to 300 mM, the enzyme activity rose to 165% of the control.

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Language(s): eng - English
 Dates: 1996
 Publication Status: Issued
 Pages: 11
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 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: A1996BF97H00013
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Title: 1st International Symposium on DMSP and Related Sulfonium Compounds
Place of Event: Mobile, AL
Start-/End Date: 1995-06-05 - 1995-06-08

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Title: Biological and environmental chemistry of DMSP and related sulfonium compounds
Source Genre: Proceedings
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Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 143 - 153 Identifier: ISBN: 0-306-45306-1