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-Structure paper
| タイトル | Lengsin is a survivor of an ancient family of class I glutamine synthetases re-engineered by evolution for a role in the vertebrate lens. |
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| ジャーナル・号・ページ | Structure, Vol. 14, Issue 12, Page 1823-1834, Year 2006 |
| 掲載日 | 2007年2月1日 |
著者 | Keith Wyatt / Helen E White / Luchun Wang / Orval A Bateman / Christine Slingsby / Elena V Orlova / Graeme Wistow / ![]() |
| PubMed 要旨 | Lengsin is a major protein of the vertebrate eye lens. It belongs to the hitherto purely prokaryotic GS I branch of the glutamine synthetase (GS) superfamily, but has no enzyme activity. Like the ...Lengsin is a major protein of the vertebrate eye lens. It belongs to the hitherto purely prokaryotic GS I branch of the glutamine synthetase (GS) superfamily, but has no enzyme activity. Like the taxon-specific crystallins, Lengsin is the result of the recruitment of an ancient enzyme to a noncatalytic role in the vertebrate lens. Cryo-EM and modeling studies of Lengsin show a dodecamer structure with important similarities and differences with prokaryotic GS I structures. GS homology regions of Lengsin are well conserved, but the N-terminal domain shows evidence of dynamic evolutionary changes. Compared with birds and fish, most mammals have an additional exon corresponding to part of the N-terminal domain; however, in human, this is a nonfunctional pseudoexon. Genes related to Lengsin are also present in the sea urchin, suggesting that this branch of the GS I family, supplanted by GS II enzymes in vertebrates, has an ancient role in metazoans. |
リンク | Structure / PubMed:17161372 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 17.0 Å |
| 構造データ | EMDB-1290: Lengsin is a survivor of an ancient family of class I glutamine synthetases re-engineered by evolution for a role in the vertebrate lens. |
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キーワード | LIGASE |
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