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-Structure paper
タイトル | Use of Cryo-EM To Uncover Structural Bases of pH Effect and Cofactor Bispecificity of Ketol-Acid Reductoisomerase. |
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ジャーナル・号・ページ | J Am Chem Soc, Vol. 141, Issue 15, Page 6136-6140, Year 2019 |
掲載日 | 2019年4月17日 |
著者 | Chin-Yu Chen / Yuan-Chih Chang / Bo-Lin Lin / Kuan-Fu Lin / Chun-Hsiang Huang / Dong-Lin Hsieh / Tzu-Ping Ko / Ming-Daw Tsai / |
PubMed 要旨 | While cryo-EM is revolutionizing structural biology, its impact on enzymology is yet to be fully demonstrated. The ketol-acid reductoisomerase (KARI) catalyzes conversion of (2 S)-acetolactate or (2 ...While cryo-EM is revolutionizing structural biology, its impact on enzymology is yet to be fully demonstrated. The ketol-acid reductoisomerase (KARI) catalyzes conversion of (2 S)-acetolactate or (2 S)-aceto-2-hydroxybutyrate to 2,3-dihydroxy-3-alkylbutyrate. We found that KARI from archaea Sulfolobus solfataricus (Sso-KARI) is unusual in being a dodecamer, bispecific to NADH and NADPH, and losing activity above pH 7.8. While crystals were obtainable only at pH 8.5, cryo-EM structures were solved at pH 7.5 and 8.5 for Sso-KARI:2Mg. The results showed that the distances of the two catalytic Mg ions are lengthened in both structures at pH 8.5. We next solved cryo-EM structures of two Sso-KARI complexes, with NADH+inhibitor and NADPH+inhibitor at pH 7.5, which indicate that the bispecificity can be attributed to a unique asparagine at the cofactor binding loop. Unexpectedly, Sso-KARI also differs from other KARI enzymes in lacking "induced-fit", reflecting structural rigidity. Thus, cryo-EM is powerful for structural and mechanistic enzymology. |
リンク | J Am Chem Soc / PubMed:30921515 |
手法 | EM (単粒子) / X線回折 |
解像度 | 2.53 - 3.38 Å |
構造データ | EMDB-9798, PDB-6jcv: EMDB-9799, PDB-6jcw: EMDB-9800, PDB-6jcz: EMDB-9801, PDB-6jd1: PDB-6jd2: |
化合物 | ChemComp-MG: ChemComp-HOH: ChemComp-NDP: ChemComp-9TY: ChemComp-NAI: ChemComp-BME: |
由来 |
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キーワード | ISOMERASE / Bi-specific / Thermostable / Reductoisomerase / Magnesium-dependent / Dodecamer / Knot-structure / Knotted protein |