The crystal structure of Sulfolobus solfataricus elongation factor 1α in complex with GDP reveals novel features in nucleotide binding and exchange(609 views) Vitagliano L, Masullo M, Sica F, Zagari A, Bocchini V
Embo J (ISSN: 0261-4189, 0261-4189linking), 2001 Oct 1; 20(19): 5305-5311.
Centro di Biocristallografia, CNR, via Mezzocannone 6, I-80134 Napoli, Italy
Dipartimento di Biochimica e Biotecnologie Mediche, Via Pansini 5, I-80131 Napoli, Italy
Dipartimento di Scienze Farmacobiologiche, Università degli Studi di Catanzaro 'Magna Graecia', Catanzaro Napoli, Italy
Dipartimento di Chimica, Università degli Studi di Napoli'Federico II', Napoli, Italy
CEINGE, Biotecnologie Avanzate Scarl, Napoli, Italy
References: Not available.
The crystal structure of Sulfolobus solfataricus elongation factor 1α in complex with GDP reveals novel features in nucleotide binding and exchange
The crystal structure of elongation factor 1α from the archaeon Sulfolobus solfataricus in complex with GDP (SsEF-1α·GDP) at 1.8 Å resolution is reported. As already known for the eubacterial elongation factor Tu, the SsEF-1α·GDP structure consists of three different structural domains. Surprisingly, the analysis of the GDP-binding site reveals that the nucleotide-protein interactions are not mediated by Mg2+. Furthermore, the residues that usually co-ordinate Mg2+ through water molecules in the GTP-binding proteins, though conserved in SsEF-1α, are located quite far from the binding site. [3H]GDP binding experiments confirm that Mg2+ has only a marginal effect on the nucleotide exchange reaction of SsEF-1α, although essential to GTPase activity elicited by SsEF-1α. Finally, structural comparisons of SsEF-1α·GDP with yeast EF-1α in complex with the nucleotide exchange factor EF-1β shows that a dramatic rearrangement of the overall structure of EF-1α occurs during the nucleotide exchange.
The crystal structure of Sulfolobus solfataricus elongation factor 1α in complex with GDP reveals novel features in nucleotide binding and exchange