1994
DOI: 10.1007/bf00939039
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Temperature dependence of growth, enzyme secretion and activity of psychrophilic Antarctic bacteria

Abstract: Five psychrophilic Antarctic bacteria have been selected for their capacity to secrete exoenzymes into culture medium. These strains are able to grow from 0 to about 25 ° C. However, production of lipase from Moraxella, a-amylase from Alteromonas haloplanctis, /3-1actamase from Psychrobacter immobilis and protease from Bacillus is maximal at temperatures close to that of their environment @2 to 4 ° C) and is strongly inhibited at higher temperatures. This thermal effect involves alterations in the secretory pa… Show more

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Cited by 86 publications
(34 citation statements)
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“…Therefore, the activity of a mesophilic enzyme can be reduced as much as 80-fold when the growth temperature is shifted from 37°C to 0°C. Despite the severe reduction of enzymatic activity, the doubling time of a psychrophilic bacteria at 4°C can be comparable to that of mesophilic bacteria grown at 37°C (57).…”
Section: Cold-adapted Enzymesmentioning
confidence: 95%
“…Therefore, the activity of a mesophilic enzyme can be reduced as much as 80-fold when the growth temperature is shifted from 37°C to 0°C. Despite the severe reduction of enzymatic activity, the doubling time of a psychrophilic bacteria at 4°C can be comparable to that of mesophilic bacteria grown at 37°C (57).…”
Section: Cold-adapted Enzymesmentioning
confidence: 95%
“…1). Some of these bacteria grow faster at 20 to 25°C but their physiological state is drastically impaired at this temperature, as judged by the reduced viable counts and the low (sometimes abolished) exoenzyme production [26]. In addition, substrate requirement, in terms of type and quantity of organic nutrients, strongly influences bacterial growth in the cold [27,28], which makes comparison of generation times somewhat difficult.…”
Section: Psychrophily: An Evolving Conceptmentioning
confidence: 99%
“…As a consequence, the activity of a mesophilic enzyme is between 16 and 80 times lower when the reaction temperature is shifted from 37°C to 0°C ( : 2 4 -3 4 ). Thus, it is surprising that metabolic rates of Antarctic fish are only slighly lower than those of temperate water species [36] and that the generation time of psychrophilic bacteria near 0°C are of the same order as those of mesophilic microorganisms at 37°C [21,26,37]. Clearly, psychrophilic organisms have found mechanisms of temperature compensation in order to cope with the reduction of chemical reaction rates inherent to low temperatures.…”
Section: Catalysis At Low Temperatures: a Thermodynamic Challengementioning
confidence: 99%
“…Psychrophiles have developed mechanisms of adaptation to temperature including a huge range of structural and physiological adjustments in order to cope with the deleterious effect of low temperatures. Indeed, they display metabolic fluxes at low temperatures that are more or less comparable to those exhibited by closely related mesophiles living at moderate temperatures (4)(5)(6). This is explained by the capability of these psychrophilic organisms to produce "cold-adapted" enzymes which are able to cope with the reduction of chemical reaction rates induced by low temperatures.…”
mentioning
confidence: 97%