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-Structure paper
タイトル | Cryo-EM reveals the structure and dynamics of a 723-residue malate synthase G. |
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ジャーナル・号・ページ | J Struct Biol, Vol. 215, Issue 2, Page 107958, Year 2023 |
掲載日 | 2023年3月28日 |
著者 | Meng-Ru Ho / Yi-Ming Wu / Yen-Chen Lu / Tzu-Ping Ko / Kuen-Phon Wu / |
PubMed 要旨 | Determination of sub-100 kDa (kDa) structures by cryo-electron microscopy (EM) is a longstanding but not straightforward goal. Here, we present a 2.9-Å cryo-EM structure of a 723-amino acid apo- ...Determination of sub-100 kDa (kDa) structures by cryo-electron microscopy (EM) is a longstanding but not straightforward goal. Here, we present a 2.9-Å cryo-EM structure of a 723-amino acid apo-form malate synthase G (MSG) from Escherichia coli. The cryo-EM structure of the 82-kDa MSG exhibits the same global folding as structures resolved by crystallography and nuclear magnetic resonance (NMR) spectroscopy, and the crystal and cryo-EM structures are indistinguishable. Analyses of MSG dynamics reveal consistent conformational flexibilities among the three experimental approaches, most notably that the α/β domain exhibits structural heterogeneity. We observed that sidechains of F453, L454, M629, and E630 residues involved in hosting the cofactor acetyl-CoA and substrate rotate differently between the cryo-EM apo-form and complex crystal structures. Our work demonstrates that the cryo-EM technique can be used to determine structures and conformational heterogeneity of sub-100 kDa biomolecules to a quality as high as that obtained from X-ray crystallography and NMR spectroscopy. |
リンク | J Struct Biol / PubMed:36997036 |
手法 | EM (単粒子) / X線回折 |
解像度 | 1.6 - 4.14 Å |
構造データ | EMDB-34029, PDB-7yqm: EMDB-34030: Cryo-EM map of a dimeric form of Ecoli Malate Synthase G (MSG) PDB-7yqn: |
化合物 | ChemComp-CL: ChemComp-NA: ChemComp-BME: ChemComp-GOL: ChemComp-HOH: |
由来 |
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キーワード | BIOSYNTHETIC PROTEIN / glyoxylate / malate / MSG / citric acid cycel / malate synthase G |