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-Structure paper
タイトル | M. mazei glutamine synthetase and glutamine synthetase-GlnK1 structures reveal enzyme regulation by oligomer modulation. |
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ジャーナル・号・ページ | Nat Commun, Vol. 14, Issue 1, Page 7375, Year 2023 |
掲載日 | 2023年11月15日 |
著者 | Maria A Schumacher / Raul Salinas / Brady A Travis / Rajiv Ranjan Singh / Nicholas Lent / |
PubMed 要旨 | Glutamine synthetases (GS) play central roles in cellular nitrogen assimilation. Although GS active-site formation requires the oligomerization of just two GS subunits, all GS form large, multi- ...Glutamine synthetases (GS) play central roles in cellular nitrogen assimilation. Although GS active-site formation requires the oligomerization of just two GS subunits, all GS form large, multi-oligomeric machines. Here we describe a structural dissection of the archaeal Methanosarcina mazei (Mm) GS and its regulation. We show that Mm GS forms unstable dodecamers. Strikingly, we show this Mm GS oligomerization property is leveraged for a unique mode of regulation whereby labile Mm GS hexamers are stabilized by binding the nitrogen regulatory protein, GlnK1. Our GS-GlnK1 structure shows that GlnK1 functions as molecular glue to affix GS hexamers together, stabilizing formation of GS active-sites. These data, therefore, reveal the structural basis for a unique form of enzyme regulation by oligomer modulation. |
リンク | Nat Commun / PubMed:37968329 / PubMed Central |
手法 | EM (単粒子) / X線回折 |
解像度 | 2.3 - 6.9 Å |
構造データ | EMDB-41228, PDB-8tfb: EMDB-41229, PDB-8tfc: EMDB-41232, PDB-8tfk: PDB-8tge: PDB-8ufj: |
化合物 | ChemComp-MG: ChemComp-P3S: ChemComp-ADP: ChemComp-HOH: |
由来 |
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キーワード | LIGASE / glutamine sythetase / GS / Methanosarcina mazei / apo / dodecamer / glutamine synthetase / partial oligomer / oligomer modulation / GS regulation / transition state / MSO / Met-Sox-P / ADP / LYASE / GlnK / PII / complex / trimer / T-loop |