Estudio de homología entre un fragmento del gen de GLUT5 humano y el putativo gen de Glut5 presente en Deschampsia Antarctica
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Date
2003
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Publisher
Universidad Austral de Chile
Abstract
Entre los estrés más comunes que afectan la sobrevivencia y distribución geográfica de las plantas, se encuentran las bajas temperaturas. Ellas afectan sus funciones metabólicas modificando muchas veces desfavorablemente su crecimiento y desarrollo. Esto conduce a un aumento de su resistencia a las bajas temperaturas, fenómeno conocido como aclimatación o endurecimiento. Esta involucra cambios a nivel morfológico, fisiológico o bioquímico, entre los cuales se pueden mencionar cambios cuali y cuantitativos de proteínas, ácidos ribonucleicos, y carbohidratos como sacarosa y fructanos.
Existen sólo dos plantas vasculares que han sido capaces de colonizar
territorio antártico. Una de ellas es Deschampsia antarctica Desv, la cual es capaz
de sobrevivir y desarrollarse a pesar de las condiciones extremas que existen en su
hábitat.
Según estudios previos la gran acumulación de sacarosa y fructanos en
esta especie sugieren la participación de un transportador facilitativo de fructosa,
similar a GLUT5 encontrado en humano.
En este estudio se analizó esta proteína en Deschampsia antarctica
Desv, y se encontró que la proteína propuesta como un transportador sería una
proteína que está asociada a la maquinaria fotosintética, específicamente al
fotosistema I en la membrana de cloroplastos.
Low temperature is the most important environmental factor that affects geographic distribution and survival of plants, affecting their metabolic function by decreasing growth and development. The exposition of plants to cold temperatures results in an increase of their capacity to resist or tolerate low temperature. This process is known as cold acclimation or cold hardening, which is associated with morphological, physiological and biochemical changes. Among the biological changes, are quantitative and qualitative changes in proteins, ribonucleic acids and increase of certain carbohydrates, sucrose and fructans as well. There are only two kinds of vascular plants that have been able to colonize the Antarctic territory. One of them corresponds to Deschampsia antarctica Desv, which is naturally adapted to survive and develop in the extreme cold conditions that exist on this natural habitat. According to previous studies the great sucrose and fructans accumulation in this specie suggests the participation of a facilitative fructose transporter, similar to human GLUT5. In this study, the protein present in Deschampsia antarctica was analyzed, and it was found that the protein proposed as a transporter would be a protein associated to the photosynthetic machinery, specifically to the photosystem I in the chloroplast membrane.
Low temperature is the most important environmental factor that affects geographic distribution and survival of plants, affecting their metabolic function by decreasing growth and development. The exposition of plants to cold temperatures results in an increase of their capacity to resist or tolerate low temperature. This process is known as cold acclimation or cold hardening, which is associated with morphological, physiological and biochemical changes. Among the biological changes, are quantitative and qualitative changes in proteins, ribonucleic acids and increase of certain carbohydrates, sucrose and fructans as well. There are only two kinds of vascular plants that have been able to colonize the Antarctic territory. One of them corresponds to Deschampsia antarctica Desv, which is naturally adapted to survive and develop in the extreme cold conditions that exist on this natural habitat. According to previous studies the great sucrose and fructans accumulation in this specie suggests the participation of a facilitative fructose transporter, similar to human GLUT5. In this study, the protein present in Deschampsia antarctica was analyzed, and it was found that the protein proposed as a transporter would be a protein associated to the photosynthetic machinery, specifically to the photosystem I in the chloroplast membrane.
Description
Tesis para optar al Grado de Licenciado en Bioquímica y al Título profesional de Bioquímico
Keywords
Ciencia, Deschampsia antarctica, Proteínas transportadoras, Plantas vasculares