Conformational switches in winged-helix domains 1 and 2 of bacterial translation elongation factor SelB
✍ Scribed by Ganichkin, Oleg ;Wahl, Markus C.
- Book ID
- 104478352
- Publisher
- International Union of Crystallography
- Year
- 2007
- Tongue
- English
- Weight
- 907 KB
- Volume
- 63
- Category
- Article
- ISSN
- 0907-4449
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✦ Synopsis
The crystal structure of the first two winged-helix motifs of translation elongation factor SelB from Moorella thermoacetica has been determined at 1.1 A resolution. Compared with the previous structure of the two domains in conjunction with winged-helix modules 3 and 4, the first winged-helix domain underwent a substantial conformational change during which the alpha-helical and beta-sheet portions of the element opened up like a shell. This conformational rearrangement was elicited by a change in the orientation of Trp396, leading to the disclosure of a bona fide ligand-binding site in the direct vicinity of Trp396. Additionally, the C-terminal tail of the second domain followed a different path compared with the previous structure. It is conceivable that these conformational switches constitute part of the molecular mechanism that underlies the communication between the N-terminal part of SelB, which binds Sec-tRNA(Sec) and GTP, and the C-terminal part of the protein, which binds selenocysteine-insertion sequences.