5IZL

The crystal structure of human eEFSec in complex with GDPCP

5IZL の概要

• エントリーDOI: 10.2210/pdb5izl/pdb
• 関連するPDBエントリー: 5IZK 5IZM
• 分子名称: Selenocysteine-specific elongation factor, MAGNESIUM ION, PHOSPHOMETHYLPHOSPHONIC ACID GUANYLATE ESTER, ... (4 entities in total)
• 機能のキーワード: elongation factor, selenocysteine, selenocysteine trna, translation, gtpase, gdpcp, gtp
• 由来する生物種: Homo sapiens (Human)
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 136218.95

構造登録者

Dobosz-Bartoszek, M.,Simonovic, M. (登録日: 2016-03-25, 公開日: 2016-10-12, 最終更新日: 2023-09-27)

主引用文献

Dobosz-Bartoszek, M.,Pinkerton, M.H.,Otwinowski, Z.,Chakravarthy, S.,Soll, D.,Copeland, P.R.,Simonovic, M.
Crystal structures of the human elongation factor eEFSec suggest a non-canonical mechanism for selenocysteine incorporation.
Nat Commun, 7:12941-12941, 2016

PubMed Abstract: Selenocysteine is the only proteinogenic amino acid encoded by a recoded in-frame UGA codon that does not operate as the canonical opal stop codon. A specialized translation elongation factor, eEFSec in eukaryotes and SelB in prokaryotes, promotes selenocysteine incorporation into selenoproteins by a still poorly understood mechanism. Our structural and biochemical results reveal that four domains of human eEFSec fold into a chalice-like structure that has similar binding affinities for GDP, GTP and other guanine nucleotides. Surprisingly, unlike in eEF1A and EF-Tu, the guanine nucleotide exchange does not cause a major conformational change in domain 1 of eEFSec, but instead induces a swing of domain 4. We propose that eEFSec employs a non-canonical mechanism involving the distinct C-terminal domain 4 for the release of the selenocysteinyl-tRNA during decoding on the ribosome.

PubMed: 27708257
DOI: 10.1038/ncomms12941

実験手法

X-RAY DIFFRACTION (2.72 Å)