[1-(13)C,2,2-di-(2)H]-O-deuteroglycolaldehyde | 1242619-20-0

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: [1-(13)C,2,2-di-(2)H]-O-deuteroglycolaldehyde
• CAS: 1242619-20-0
• 化学式: C₂H₄O₂
• 分子量: 64.0177
• InChiKey: WGCNASOHLSPBMP-PLOGBNQFSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -0.82
• 重原子数：
  4.0
• 可旋转键数：
  2.0
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.5
• 拓扑面积：
  37.3
• 氢给体数：
  1.0
• 氢受体数：
  2.0

反应信息

• 作为产物：
  描述：

  [1-(13)C]-O-deuteroglycolaldehyde 在 咪唑 、 Saccharomyces cerevisiae triosephosphate isomerase K₁₂G mutant 、 重水 作用下， 反应 78.0h， 生成 [2-(13)C]-O-deuteroglycolaldehyde 、 [2-(13)C,2-(2)H]-O-deuteroglycolaldehyde 、 [1-(13)C,2,2-di-(2)H]-O-deuteroglycolaldehyde
  参考文献：
  名称：

  Role of Lys-12 in Catalysis by Triosephosphate Isomerase: A Two-Part Substrate Approach

  摘要：

  We report that the K12G mutation in triosephosphate isomerase (TIM) from Saccharomyces cerevisiae results in (1) a similar to 50-fold increase in K-m for the substrate glyceraldehyde 3-phosphate (GAP) and a 60-fold increase in K-i for competitive inhibition by the intermediate analogue 2-phosphoglycolate, resulting from the loss of stabilizing ground state interactions between the alkylammonium side chain of Lys-12 and the ligand phosphodianion group; (2) a 12000-fold decrease in k(cat) for isomerization of GAP, suggesting a tightening of interactions between the side chain of Lys-12 and the substrate on proceeding from the Michaelis complex to the transition state; and (3) a 6 x 10(5)-fold decrease in k(cat)/K-m, corresponding to a total 7.8 kcal/mol stabilization of the transition state by the cationic side chain of Lys-12. The yields of the four products of the K12G TIM-catalyzed isomerization of GAP in D2O were quantified as dihydroxyacetone phosphate (D H A P) (27%), [1(R)-H-2]DHAP (23%), [2(R)-H-2]GAP (31%), and methylglyoxal (18%) from an enzyme-catalyzed elimination reaction. The K12G mutation has only a small effect on the relative yields of the three products of the transfer of a proton to the TIM-bound enediol(ate) intermediate in D2O, but it strongly favors catalysis of the elimination reaction to give methylglyoxal. The K12G mutation also results in a >= 14-fold decrease in k(cat)/K-m for isomerization of bound glycolaldehyde (GA), although the dominant observed product of the mutant enzyme-catalyzed reaction of [1-C-13]GA in D2O is [1-C-13,2,2-di-H-2]GA from a nonspecific protein-catalyzed reaction. The observation that the K12G mutation results in a large decrease in k(cat)/K-m for the reactions of both GAP and the neutral truncated substrate [1-C-13]GA provides evidence for a stabilizing interaction between the cationic side chain of Lys-12 and the negative charge that develops at the enolate-like oxygen in the transition state for deprotonation of the sugar substrate "piece".

  DOI：

  10.1021/bi100538b

文献信息

• Structural Mutations That Probe the Interactions between the Catalytic and Dianion Activation Sites of Triosephosphate Isomerase
  作者：Xiang Zhai、Tina L. Amyes、Rik K. Wierenga、J. Patrick Loria、John P. Richard

  DOI：10.1021/bi401019h

  日期：2013.8.27

  decreases in (kcat/Km)E and (kcat/Km)E·HPi, respectively, for deprotonation of GA catalyzed by free TIM and by the TIM·HPO32– complex. The mutation has little effect on the observed and intrinsic phosphite dianion binding energy or the magnitude of phosphite dianion activation of TIM for catalysis of deprotonation of GA. A loop 7 replacement mutant (L7RM) of TIM from chicken muscle was prepared by substitution

  磷酸丙糖异构酶 (TIM) 催化磷酸二羟基丙酮异构化形成d-甘油醛 3-磷酸。报道了 TIM 中的两个结构突变对催化截短底物乙醇醛 (GA) 反应的动力学参数和亚磷酸酯二价阴离子活化该反应的影响。P168A 突变导致 ( k cat / K m ) E和 ( k cat / K m ) E·HP i 的类似降低 50 倍和 80 倍，分别用于由游离 TIM 和 TIM·催化的 GA 去质子化HPO 3 2–复杂的。该突变对观察到的和固有的亚磷酸酯二价阴离子结合能或用于催化 GA 去质子化的 TIM 的亚磷酸酯二价阴离子活化程度几乎没有影响。通过用 208-YGGS 替换古菌序列 208-TGAG 制备了来自鸡肌肉的 TIM 环 7 置换突变体 (L7RM)。L7RM 的 ( k cat / K m ) E降低了 25 倍，( k cat / K m ) E·HP i降低了 170 倍GA
• Role of Loop-Clamping Side Chains in Catalysis by Triosephosphate Isomerase
  作者：Xiang Zhai、Tina L. Amyes、John P. Richard

  DOI：10.1021/jacs.5b09328

  日期：2015.12.9

  linear logarithmic correlation [slope = 0.53 ± 0.16] between kcat for isomerization of GAP and Kd⧧ for phosphite dianion binding to the transition state for wildtype and many mutant TIM-catalyzed reactions of substrate pieces shows that ca. 50% of the wildtype TIM dianion binding energy, eliminated by these mutations, is expressed at the wildtype Michaelis complex, and ca. 50% is only expressed at the

  来自磷酸丙糖异构酶 (TIM) 环 7 的 Y208 和 S211 的侧链与来自环 6 的骨架酰胺和羰基形成氢键，以稳定笼式酶 - 底物复合物。七个突变 [Y208T、Y208S、Y208A、Y208F、S211G、S211A、Y208T/S211G] 对整个底物磷酸二羟基丙酮和 d-甘油醛 3-磷酸 [(kcat/Km) TIM 催化反应动力学参数的影响和 (kcat/Km)DHAP] 以及底物片乙醇醛和亚磷酸酯二价阴离子 (kcat/KHPiKGA) 的报道。这些动力学参数之间的线性对数相关，斜率为 1.04 ± 0.03，表明 TIM 的大多数突变导致整个底物和底物片催化反应的活化势垒发生相同的变化，从而通过与蛋白质催化剂的类似相互作用来稳定这些反应的过渡态。第二个线性对数相关性 [斜率 = 0.53 ± 0.16] 用于 GAP 异构化的 kcat 和用于结合野生型过渡态的亚磷酸酯二价阴离子