Studies on metabolic properties in the Northern Krill, Meganyctiphanes norvegica (Crustacea, Euphausiacea): influence of nutrition and season on pyruvate kinase
International audience The specific activity and the kinetic properties of partly purified pyruvate kinase (PK) (EC 2.7.1.40) from the Northern Krill, Meganyctiphanes norvegica, were investigated in relation to varying food resources. In order to evaluate the effect of starvation on the total energy...
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ftsorbonneuniv:oai:HAL:hal-03483074v1 2024-09-15T18:18:24+00:00 Studies on metabolic properties in the Northern Krill, Meganyctiphanes norvegica (Crustacea, Euphausiacea): influence of nutrition and season on pyruvate kinase Salomon, M Mayzaud, P Buchholz, F Station Zoologique de Villefranche Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) 2000 https://hal.science/hal-03483074 https://doi.org/10.1016/S1095-6433(00)00281-6 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.1016/S1095-6433(00)00281-6 hal-03483074 https://hal.science/hal-03483074 doi:10.1016/S1095-6433(00)00281-6 COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY https://hal.science/hal-03483074 COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY, 2000, 127 (4), pp.505-514. ⟨10.1016/S1095-6433(00)00281-6⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2000 ftsorbonneuniv https://doi.org/10.1016/S1095-6433(00)00281-6 2024-07-25T23:47:52Z International audience The specific activity and the kinetic properties of partly purified pyruvate kinase (PK) (EC 2.7.1.40) from the Northern Krill, Meganyctiphanes norvegica, were investigated in relation to varying food resources. In order to evaluate the effect of starvation on the total energy metabolism, the respiration rates of fed and unfed krill were determined. The FPLC-elution profile of PK displayed two distinct peaks - PK I and II. The first isoform represented 80% of the total PK activity in the organism, and 20% was contributed by the second isoform. PK I was inhibited by ATP but was not influenced by fructose-1,6-bisphosphate (FBP). In contrast, PK II showed ATP inhibition and up to 2.5-fold increased activity by addition of 17 mu mol.l(-1) FBP. The Michaelis-Menten constants of both isoforms were 2-10-fold higher for ADP than for phosphoenolpyruvate (PEP). Alanine showed no regulatory effect on PK I and II. In specimens starved for 7 days oxygen consumption decreased by 20%. Neither the feeding experiments nor the animals captured in the field during low and high productive seasons indicate that PK properties of M. norvegica are modified in relation to food supply. Accordingly, alternative mechanisms are involved in the depression of the metabolic rate in terms of oxygen consumption. (C) 2000 Elsevier Science Inc. All rights reserved. Article in Journal/Newspaper Meganyctiphanes norvegica Northern krill HAL Sorbonne Université Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology 127 4 505 514 |
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Open Polar |
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HAL Sorbonne Université |
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ftsorbonneuniv |
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English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
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[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Salomon, M Mayzaud, P Buchholz, F Studies on metabolic properties in the Northern Krill, Meganyctiphanes norvegica (Crustacea, Euphausiacea): influence of nutrition and season on pyruvate kinase |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience The specific activity and the kinetic properties of partly purified pyruvate kinase (PK) (EC 2.7.1.40) from the Northern Krill, Meganyctiphanes norvegica, were investigated in relation to varying food resources. In order to evaluate the effect of starvation on the total energy metabolism, the respiration rates of fed and unfed krill were determined. The FPLC-elution profile of PK displayed two distinct peaks - PK I and II. The first isoform represented 80% of the total PK activity in the organism, and 20% was contributed by the second isoform. PK I was inhibited by ATP but was not influenced by fructose-1,6-bisphosphate (FBP). In contrast, PK II showed ATP inhibition and up to 2.5-fold increased activity by addition of 17 mu mol.l(-1) FBP. The Michaelis-Menten constants of both isoforms were 2-10-fold higher for ADP than for phosphoenolpyruvate (PEP). Alanine showed no regulatory effect on PK I and II. In specimens starved for 7 days oxygen consumption decreased by 20%. Neither the feeding experiments nor the animals captured in the field during low and high productive seasons indicate that PK properties of M. norvegica are modified in relation to food supply. Accordingly, alternative mechanisms are involved in the depression of the metabolic rate in terms of oxygen consumption. (C) 2000 Elsevier Science Inc. All rights reserved. |
author2 |
Station Zoologique de Villefranche Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Salomon, M Mayzaud, P Buchholz, F |
author_facet |
Salomon, M Mayzaud, P Buchholz, F |
author_sort |
Salomon, M |
title |
Studies on metabolic properties in the Northern Krill, Meganyctiphanes norvegica (Crustacea, Euphausiacea): influence of nutrition and season on pyruvate kinase |
title_short |
Studies on metabolic properties in the Northern Krill, Meganyctiphanes norvegica (Crustacea, Euphausiacea): influence of nutrition and season on pyruvate kinase |
title_full |
Studies on metabolic properties in the Northern Krill, Meganyctiphanes norvegica (Crustacea, Euphausiacea): influence of nutrition and season on pyruvate kinase |
title_fullStr |
Studies on metabolic properties in the Northern Krill, Meganyctiphanes norvegica (Crustacea, Euphausiacea): influence of nutrition and season on pyruvate kinase |
title_full_unstemmed |
Studies on metabolic properties in the Northern Krill, Meganyctiphanes norvegica (Crustacea, Euphausiacea): influence of nutrition and season on pyruvate kinase |
title_sort |
studies on metabolic properties in the northern krill, meganyctiphanes norvegica (crustacea, euphausiacea): influence of nutrition and season on pyruvate kinase |
publisher |
HAL CCSD |
publishDate |
2000 |
url |
https://hal.science/hal-03483074 https://doi.org/10.1016/S1095-6433(00)00281-6 |
genre |
Meganyctiphanes norvegica Northern krill |
genre_facet |
Meganyctiphanes norvegica Northern krill |
op_source |
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY https://hal.science/hal-03483074 COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY, 2000, 127 (4), pp.505-514. ⟨10.1016/S1095-6433(00)00281-6⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/S1095-6433(00)00281-6 hal-03483074 https://hal.science/hal-03483074 doi:10.1016/S1095-6433(00)00281-6 |
op_doi |
https://doi.org/10.1016/S1095-6433(00)00281-6 |
container_title |
Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology |
container_volume |
127 |
container_issue |
4 |
container_start_page |
505 |
op_container_end_page |
514 |
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1810456523616288768 |