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. 1997 May;79(5):303-8.
doi: 10.1016/s0300-9084(97)83518-3.

Heterologous expression in Escherichia coli of the gene encoding an archaeal thermoacidophilic elongation factor 2. Properties of the recombinant protein

E de Vendittis  1 , M R Amatruda, G Raimo, V Bocchini
Affiliations

Heterologous expression in Escherichia coli of the gene encoding an archaeal thermoacidophilic elongation factor 2. Properties of the recombinant protein

E de Vendittis et al. Biochimie. 1997 May.

Abstract

The gene encoding the elongation factor 2 from the hyperthermophilic archaeon Sulfolobus solfataricus (SsEF-2) was expressed in Escherichia coli using the pT7-7 expression vector. The synthesis of the heterologous product did not increase upon addition of isopropyl-beta-thiogalactopyranoside. The amount of purified intact recombinant SsEF-2 (SsEF-2rec) was about 3 mg from 60 g of transformed wet cells. Recombinant and naturally occurring SsEF-2 showed identical electrophoretic mobility, immunological properties and the N-terminal amino acid sequence; both were lacking the initial methionine. Differently from SsEF-2, SsEF-2rec did not undergo post-translational modification of His603 into diphthamide, as indicated by its inability to be ADP-ribosylated. SsEF-2rec appeared indistinguishable from SsEF-2 in the fulfillment of its biological functions; in fact, it was fully capable to support poly(Phe) synthesis, to bind GDP and to display either the intrinsic or the ribosome-dependent GTPase. Finally, SsEF-2rec was endowed with the same heat stability as SsEF-2. Altogether these findings proved that SsEF-2rec was functionally active as SsEF-2. The used expression system could allow to produce mutated forms of SsEF-2 obtained by mutagenesis of the corresponding gene.

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