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-Structure paper
タイトル | Ribosome-NatA architecture reveals that rRNA expansion segments coordinate N-terminal acetylation. |
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ジャーナル・号・ページ | Nat Struct Mol Biol, Vol. 26, Issue 1, Page 35-39, Year 2019 |
掲載日 | 2018年12月17日 |
著者 | Alexandra G Knorr / Christian Schmidt / Petr Tesina / Otto Berninghausen / Thomas Becker / Birgitta Beatrix / Roland Beckmann / |
PubMed 要旨 | The majority of eukaryotic proteins are N-terminally α-acetylated by N-terminal acetyltransferases (NATs). Acetylation usually occurs co-translationally and defects have severe consequences. ...The majority of eukaryotic proteins are N-terminally α-acetylated by N-terminal acetyltransferases (NATs). Acetylation usually occurs co-translationally and defects have severe consequences. Nevertheless, it is unclear how these enzymes act in concert with the translating ribosome. Here, we report the structure of a native ribosome-NatA complex from Saccharomyces cerevisiae. NatA (comprising Naa10, Naa15 and Naa50) displays a unique mode of ribosome interaction by contacting eukaryotic-specific ribosomal RNA expansion segments in three out of four binding patches. Thereby, NatA is dynamically positioned directly underneath the ribosomal exit tunnel to facilitate modification of the emerging nascent peptide chain. Methionine amino peptidases, but not chaperones or signal recognition particle, would be able to bind concomitantly. This work assigns a function to the hitherto enigmatic ribosomal RNA expansion segments and provides mechanistic insights into co-translational protein maturation by N-terminal acetylation. |
リンク | Nat Struct Mol Biol / PubMed:30559462 |
手法 | EM (単粒子) |
解像度 | 3.4 - 6.7 Å |
構造データ | EMDB-0203: |
化合物 | ChemComp-3HE: |
由来 |
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キーワード | TRANSLATION / N-terminal acetylation / protein modification / ribosome / expansion segments |