Biphasic Extracellular Proteolytic Enzyme Activity in Benthic Water and Sediment in the Northwestern Mediterranean Sea

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Published in:Applied and Environmental Microbiology Vol. 65; no. 4; pp. 1619 - 1626
Main Authors: THOLOSAN, O, LAMY, F, GARCIN, J, POLYCHRONAKI, T, BIANCHI, A
Format: Journal Article
Language:English
Published: Washington, DC American Society for Microbiology 01-04-1999
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AbstractList In this study, we used the fact that bacteria are able to cleave a fluorogenic substrate analog (L-leucine-7-amido-4-methylcoumarin) to determine the maximal ectoproteolytic activities (V sub(m)) and affinities (K sub(m)) of natural benthic microbial communities by the multiconcentration kinetic method. This investigation was performed during the winter and summer of 1997 with a set of 36 samples of near-bottom water and sediment collected from a coastal area and an offshore area in the western part of the Gulf of Lions. The existence of biphasic microbial ectoproteolysis was statistically confirmed for both the near-bottom water and the sediment, regardless of the spatial and seasonal conditions. Globally, 72.2% of the entire set of bacterial consortia collected at the water-sediment boundary layer showed biphasic microbial kinetics. A specific estimator of the biphasicity indicated that deep benthic bacterial consortia responded better with episodic nutrient supplies than shallower benthic bacterial consortia responded.
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In this study, we used the fact that bacteria are able to cleave a fluorogenic substrate analog ( l -leucine-7-amido-4-methylcoumarin) to determine the maximal ectoproteolytic activities ( V m ) and affinities ( K m ) of natural benthic microbial communities by the multiconcentration kinetic method. This investigation was performed during the winter and summer of 1997 with a set of 36 samples of near-bottom water and sediment collected from a coastal area and an offshore area in the western part of the Gulf of Lions. The existence of biphasic microbial ectoproteolysis was statistically confirmed for both the near-bottom water and the sediment, regardless of the spatial and seasonal conditions. Globally, 72.2% of the entire set of bacterial consortia collected at the water-sediment boundary layer showed biphasic microbial kinetics. A specific estimator of the biphasicity indicated that deep benthic bacterial consortia responded better with episodic nutrient supplies than shallower benthic bacterial consortia responded.
In this study, we used the fact that bacteria are able to cleave a fluorogenic substrate analog (L-leucine-7-amido-4-methylcoumarin) to determine the maximal ectoproteolytic activities (Vm) and affinities (Km) of natural benthic microbial communities by the multiconcentration kinetic method.
In this study, we used the fact that bacteria are able to cleave a fluorogenic substrate analog (L-leucine-7-amido-4-methylcoumarin) to determine the maximal ectoproteolytic activities (Vm) and affinities (Km) of natural benthic microbial communities by the multiconcentration kinetic method. This investigation was performed during the winter and summer of 1997 with a set of 36 samples of near-bottom water and sediment collected from a coastal area and an offshore area in the western part of the Gulf of Lions. The existence of biphasic microbial ectoproteolysis was statistically confirmed for both the near-bottom water and the sediment, regardless of the spatial and seasonal conditions. Globally, 72.2% of the entire set of bacterial consortia collected at the water-sediment boundary layer showed biphasic microbial kinetics. A specific estimator of the biphasicity indicated that deep benthic bacterial consortia responded better with episodic nutrient supplies than shallower benthic bacterial consortia responded.
Author Jean Garcin
Thalia Polychronaki
Olivier Tholosan
François Lamy
Armand Bianchi
AuthorAffiliation Microbiologie Marine, Centre National de la Recherche Scientifique-Institut National des Sciences de l’Univers, Université de la Méditerranée, F-13288 Marseille Cedex 9, France, 1 and Institute of Marine Biology of Crete, GR71003, Iraklion, Crete, Greece 2
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Issue 4
Keywords Marine environment
Peptidases
Enzymatic activity
Enzyme
Hydrolases
Kinetics
Kinetic parameter
Sediments
Microbial community
Benthic zone
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Corresponding author. Mailing address: Microbiologie Marine, Centre National de la Recherche Scientifique-Institut National des Sciences de l’Univers-EP 2032, Université de la Méditerranée, F-13288 Marseille Cedex 9, France. Phone: 33 4 91 82 90 49. Fax: 33 4 91 82 90 51. E-mail: a-bianchi@luminy.univ-mrs.fr.
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In this study, we used the fact that bacteria are able to cleave a fluorogenic substrate analog (L-leucine-7-amido-4-methylcoumarin) to determine the maximal...
In this study, we used the fact that bacteria are able to cleave a fluorogenic substrate analog ( l -leucine-7-amido-4-methylcoumarin) to determine the maximal...
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proquest
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SourceType Open Access Repository
Aggregation Database
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StartPage 1619
SubjectTerms Animal, plant and microbial ecology
Bacteria
Biological and medical sciences
Enzymes
Fundamental and applied biological sciences. Psychology
General Microbial Ecology
Greece
L-Leucine-7-amido-4 methylcoumarin
Mediterranean Sea
Mediterranean Sea, Lions Gulf
Microbial ecology
Microbiology
Oceans
Sediments
Various environments (extraatmospheric space, air, water)
Water
Title Biphasic Extracellular Proteolytic Enzyme Activity in Benthic Water and Sediment in the Northwestern Mediterranean Sea
URI http://aem.asm.org/content/65/4/1619.abstract
https://www.ncbi.nlm.nih.gov/pubmed/10103259
https://www.proquest.com/docview/205940415
https://search.proquest.com/docview/17361208
https://search.proquest.com/docview/1859301601
https://search.proquest.com/docview/26870355
https://pubmed.ncbi.nlm.nih.gov/PMC91229
Volume 65
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