Publicado

2017-09-01

Diseño y producción de diversas proteínas fusión de la nicotinamida/nicotinato mononucleótido adenilil transferasa (NMNAT) de Plasmodium falciparum

Design and production of various fusion proteins of the nicotinamide/nicotinate mononucleotide adenilil transferase (NMNAT) of Plasmodium falciparum

Palabras clave:

Plasmodium falciparum, solubilidad, NMNAT, proteína recombinante, cuerpos de inclusión, TAG fusión (es)
solubility, PfNMNAT, inclusion bodies, fusion TAG (en)

Autores/as

  • Carlos Alfonso Nieto Clavijo Universidad Nacional de Colombia
  • Nicolás Forero Baena Universidad Nacional de Colombia
  • María Helena Ramírez Hernández Universidad Nacional de Colombia

Las proteínas recombinantes se han convertido en herramientas útiles en la investigación bioquímica. Sin embargo, durante su producción, aparecen cuerpos de inclusión (IB), debido, por un lado, a la alta expresión de proteína producida a partir de los vectores usados que poseen promotores de alta eficiencia y, por otro lado, a características propias de la proteína. Ahora bien, la nicotinamida/nicotinato mononucleótido adenililtransferasa (NMNAT) es una proteína central en la biosíntesis del NAD(H)+, molécula esencial en el metabolismo celular, y ha sido estudiada en parásitos protozoos. Para el estudio de la NMNAT de estos parásitos se ha recurrido a la expresión de su versión recombinante en E. coli, obteniéndose gran cantidad de proteína como IB. Con el fin de aumentar la solubilidad de la proteína, se clonó la secuencia codificante de la NMNAT de Plasmodium falciparum en diferentes vectores de expresión, se indujo la expresión de la proteína recombinante en E. coli BL21(DE3) y se analizó la solubilidad. La proteína fusión con mayor solubilidad fue purificada y evaluada enzimáticamente. La adición de la etiqueta MBP (proteína de unión a maltosa) a la PfNMNAT incrementó su solubilidad y permitió obtener una proteína funcional con una alta pureza. 

Recombinant proteins have become useful tools in biochemistry research. During their production, however, inclusion bodies (IB) appear, on the one hand, due to the high expression rate from the recombinant plasmids, which have high efficiency promoters, and, on the other hand, intrinsic characteristics of the expressed protein. Furhtermore, the nicotinamide/nicotinate mononucleotide adenilyl transferase (NMNAT) is a central protein in NAD(H)+ biosynthesis, an essential cofactor in cell metabolism, and in protozoon parasite has been studied. To study the NMNAT protein of these parasites, their recombinant version in E. coli has been expressed, getting a great quantity of IB as a by-product. To increase the solubility of the protein, the coding sequence of the NMNAT enzyme of Plasmodium falciparum was cloned in different expression plasmids which were subsequently transformed into E. coli BL21(DE3) expression strain. The solubility of the recombinant proteins was assessed and the one with the highest presence in the soluble fraction was subsequently purified and its enzyme activity was determined. The recombinant protein with a MBP (maltose-binding protein) tag showed an increased solubility and purity.

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