4PDN

Crystal structure of E. coli YfcM

4PDN の概要

• エントリーDOI: 10.2210/pdb4pdn/pdb
• 分子名称: Uncharacterized protein, MAGNESIUM ION (3 entities in total)
• 機能のキーワード: hydroxylase, oxidoreductase
• 由来する生物種: Escherichia coli KTE5
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 22243.99

構造登録者

Kobayashi, K.,Ishii, R.,Ishitani, R.,Nureki, O. (登録日: 2014-04-19, 公開日: 2015-03-04, 最終更新日: 2024-03-20)

主引用文献

Kobayashi, K.,Katz, A.,Rajkovic, A.,Ishii, R.,Branson, O.E.,Freitas, M.A.,Ishitani, R.,Ibba, M.,Nureki, O.
The non-canonical hydroxylase structure of YfcM reveals a metal ion-coordination motif required for EF-P hydroxylation.
Nucleic Acids Res., 42:12295-12305, 2014

PubMed Abstract: EF-P is a bacterial tRNA-mimic protein, which accelerates the ribosome-catalyzed polymerization of poly-prolines. In Escherichia coli, EF-P is post-translationally modified on a conserved lysine residue. The post-translational modification is performed in a two-step reaction involving the addition of a β-lysine moiety and the subsequent hydroxylation, catalyzed by PoxA and YfcM, respectively. The β-lysine moiety was previously shown to enhance the rate of poly-proline synthesis, but the role of the hydroxylation is poorly understood. We solved the crystal structure of YfcM and performed functional analyses to determine the hydroxylation mechanism. In addition, YfcM appears to be structurally distinct from any other hydroxylase structures reported so far. The structure of YfcM is similar to that of the ribonuclease YbeY, even though they do not share sequence homology. Furthermore, YfcM has a metal ion-coordinating motif, similar to YbeY. The metal ion-coordinating motif of YfcM resembles a 2-His-1-carboxylate motif, which coordinates an Fe(II) ion and forms the catalytic site of non-heme iron enzymes. Our findings showed that the metal ion-coordinating motif of YfcM plays an essential role in the hydroxylation of the β-lysylated lysine residue of EF-P. Taken together, our results suggested the potential catalytic mechanism of hydroxylation by YfcM.

PubMed: 25274739
DOI: 10.1093/nar/gku898

実験手法

X-RAY DIFFRACTION (1.448 Å)