On the dynamics of the adenylate energy system: homeorhesis vs homeostasis.

Biochemical energy is the fundamental element that maintains both the adequate turnover of the biomolecular structures and the functional metabolic viability of unicellular organisms. The levels of ATP, ADP and AMP reflect roughly the energetic status of the cell, and a precise ratio relating them w...

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Autores principales:	Ildefonso M De la Fuente, Jesús M Cortés, Edelmira Valero, Mathieu Desroches, Serafim Rodrigues, Iker Malaina, Luis Martínez
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2014
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/95a40d43d5f0486ea03967f5adea2ead
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spelling	oai:doaj.org-article:95a40d43d5f0486ea03967f5adea2ead2021-11-25T05:57:01ZOn the dynamics of the adenylate energy system: homeorhesis vs homeostasis.1932-620310.1371/journal.pone.0108676https://doaj.org/article/95a40d43d5f0486ea03967f5adea2ead2014-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0108676https://doaj.org/toc/1932-6203Biochemical energy is the fundamental element that maintains both the adequate turnover of the biomolecular structures and the functional metabolic viability of unicellular organisms. The levels of ATP, ADP and AMP reflect roughly the energetic status of the cell, and a precise ratio relating them was proposed by Atkinson as the adenylate energy charge (AEC). Under growth-phase conditions, cells maintain the AEC within narrow physiological values, despite extremely large fluctuations in the adenine nucleotides concentration. Intensive experimental studies have shown that these AEC values are preserved in a wide variety of organisms, both eukaryotes and prokaryotes. Here, to understand some of the functional elements involved in the cellular energy status, we present a computational model conformed by some key essential parts of the adenylate energy system. Specifically, we have considered (I) the main synthesis process of ATP from ADP, (II) the main catalyzed phosphotransfer reaction for interconversion of ATP, ADP and AMP, (III) the enzymatic hydrolysis of ATP yielding ADP, and (IV) the enzymatic hydrolysis of ATP providing AMP. This leads to a dynamic metabolic model (with the form of a delayed differential system) in which the enzymatic rate equations and all the physiological kinetic parameters have been explicitly considered and experimentally tested in vitro. Our central hypothesis is that cells are characterized by changing energy dynamics (homeorhesis). The results show that the AEC presents stable transitions between steady states and periodic oscillations and, in agreement with experimental data these oscillations range within the narrow AEC window. Furthermore, the model shows sustained oscillations in the Gibbs free energy and in the total nucleotide pool. The present study provides a step forward towards the understanding of the fundamental principles and quantitative laws governing the adenylate energy system, which is a fundamental element for unveiling the dynamics of cellular life.Ildefonso M De la FuenteJesús M CortésEdelmira ValeroMathieu DesrochesSerafim RodriguesIker MalainaLuis MartínezPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 9, Iss 10, p e108676 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Ildefonso M De la Fuente Jesús M Cortés Edelmira Valero Mathieu Desroches Serafim Rodrigues Iker Malaina Luis Martínez On the dynamics of the adenylate energy system: homeorhesis vs homeostasis.
description	Biochemical energy is the fundamental element that maintains both the adequate turnover of the biomolecular structures and the functional metabolic viability of unicellular organisms. The levels of ATP, ADP and AMP reflect roughly the energetic status of the cell, and a precise ratio relating them was proposed by Atkinson as the adenylate energy charge (AEC). Under growth-phase conditions, cells maintain the AEC within narrow physiological values, despite extremely large fluctuations in the adenine nucleotides concentration. Intensive experimental studies have shown that these AEC values are preserved in a wide variety of organisms, both eukaryotes and prokaryotes. Here, to understand some of the functional elements involved in the cellular energy status, we present a computational model conformed by some key essential parts of the adenylate energy system. Specifically, we have considered (I) the main synthesis process of ATP from ADP, (II) the main catalyzed phosphotransfer reaction for interconversion of ATP, ADP and AMP, (III) the enzymatic hydrolysis of ATP yielding ADP, and (IV) the enzymatic hydrolysis of ATP providing AMP. This leads to a dynamic metabolic model (with the form of a delayed differential system) in which the enzymatic rate equations and all the physiological kinetic parameters have been explicitly considered and experimentally tested in vitro. Our central hypothesis is that cells are characterized by changing energy dynamics (homeorhesis). The results show that the AEC presents stable transitions between steady states and periodic oscillations and, in agreement with experimental data these oscillations range within the narrow AEC window. Furthermore, the model shows sustained oscillations in the Gibbs free energy and in the total nucleotide pool. The present study provides a step forward towards the understanding of the fundamental principles and quantitative laws governing the adenylate energy system, which is a fundamental element for unveiling the dynamics of cellular life.
format	article
author	Ildefonso M De la Fuente Jesús M Cortés Edelmira Valero Mathieu Desroches Serafim Rodrigues Iker Malaina Luis Martínez
author_facet	Ildefonso M De la Fuente Jesús M Cortés Edelmira Valero Mathieu Desroches Serafim Rodrigues Iker Malaina Luis Martínez
author_sort	Ildefonso M De la Fuente
title	On the dynamics of the adenylate energy system: homeorhesis vs homeostasis.
title_short	On the dynamics of the adenylate energy system: homeorhesis vs homeostasis.
title_full	On the dynamics of the adenylate energy system: homeorhesis vs homeostasis.
title_fullStr	On the dynamics of the adenylate energy system: homeorhesis vs homeostasis.
title_full_unstemmed	On the dynamics of the adenylate energy system: homeorhesis vs homeostasis.
title_sort	on the dynamics of the adenylate energy system: homeorhesis vs homeostasis.
publisher	Public Library of Science (PLoS)
publishDate	2014
url	https://doaj.org/article/95a40d43d5f0486ea03967f5adea2ead
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On the dynamics of the adenylate energy system: homeorhesis vs homeostasis.

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