isoleucinylglycylglycin | 68293-03-8

• 分子结构分类: 有机化合物 - 有机酸及其衍生物 - 羧酸及其衍生物
• 英文名称: isoleucinylglycylglycin
• 英文别名: Ile-Gly-Gly；IleGlyGly；Glycine, L-isoleucylglycyl-；2-[[2-[[(2S,3S)-2-amino-3-methylpentanoyl]amino]acetyl]amino]acetic acid
• CAS: 68293-03-8
• 化学式: C₁₀H₁₉N₃O₄
• mdl: MFCD00037784
• 分子量: 245.279
• InChiKey: CDGLBYSAZFIIJO-RCOVLWMOSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -2.3
• 重原子数：
  17
• 可旋转键数：
  6
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.7
• 拓扑面积：
  126
• 氢给体数：
  3
• 氢受体数：
  4

反应信息

• 作为反应物：
  描述：

  isoleucinylglycylglycin 、 β-乳糖 在 盐酸 、 水 作用下， 以 甲醇 、 二甲基亚砜 为溶剂， 反应 31.0h， 生成 α-FM-Ile
  参考文献：
  名称：

  Studies on N-Terminal Glycation of Peptides in Hypoallergenic Infant Formulas:  Quantification of α-N-(2-Furoylmethyl) Amino Acids

  摘要：

  To obtain information about the extent of the early Maillard reaction between the N-termini of peptides and lactose, alpha-N-(2-furoylmethyl) amino acids (FMAAs) were quantified together with is an element of-N-(2-furoylmethyl) lysine (furosine) in acid hydrolyzates of hypoallergenic infant formulas, conventional infant formulas, and human milk samples using RP-HPLC with UV-detection. FMAAs are formed during acid hydrolysis of peptide-bound N-terminal Amadori products (APs), and furosine is formed from the Amadori products of peptide-bound lysine. Unambiguous identification was achieved by means of LC/MS and UV-spectroscopy using independently prepared reference material. The extent of acid-induced conversion of APs to FMAAs was studied by RP-HPLC with chemiluminescent nitrogen detection (CLND). Depending on the corresponding alpha-N-lactulosyl amino acid, between 6.0% and 18.1% of FMAAs were formed during hydrolysis for 23 h at 110 degrees C in 8 N HCl. From is an element of-N-lactulosyllysine, 50% furosine is formed under these conditions. Whereas furosine was detectable in all assayed samples, five different FMAAs, alpha-FM-Lys, alpha-FM-Ala, alpha-FM-Val, alpha-FM-Ile, and alpha-FM-Leu, were exclusively detected in acid hydrolyzates of hypoallergenic infant formulas in amounts ranging from 35 to 396 mu mol/100 g protein. Taking the conversion factors into account, modification of N-terminal amino acids in peptides by reducing carbohydrates was between 0.3% and 8.4%. This has to be considered within the discussion concerning the nutritional quality of peptide- containing foods.

  DOI：

  10.1021/jf061821b
• 作为产物：
  描述：

  疊氮乙酸 、 Fmoc-Ile-OSu 、 alkaline earth salt of/the/ methylsulfuric acid 生成 isoleucinylglycylglycin
  参考文献：
  名称：

  Improved Solid-Phase Peptide Synthesis Method Utilizing α-Azide-Protected Amino Acids

  摘要：

  [GRAPHICS]Pure alpha -azido acids were prepared using an efficient diazo transfer method followed by buffered workup, These building blocks were used to prepare small peptides on Wang resin by two approaches, Peptides prone to diketopiperazine formation were prepared in good yields by coupling acids to resin bound iminophosphoranes during Fmoc-Wang synthesis, The iminophosphoranes can also be hydrolyzed under neutral conditions to provide unprotected amines ready for further coupling.

  DOI：

  10.1021/ol0155485

文献信息

• Linear energy correlations and failures in the low-energy tandem mass spectra of protonatedN-benzoylated tripeptides: Tools for probing mechanisms of CAD processes
  作者：Daniel G. Morgan、Maurice M. Bursey

  DOI：10.1002/jms.1190300410

  日期：1995.4

  The backbone cleavages for three series of protonated N-benzoyl tripeptide ions were studied in a hybrid tandem mass spectrometer: (i) benzoyl-Gly-Gly-Xxx, where Xxx = Gly, Ala, Val, Leu, Ile, Phe, Tyr, Met, Glu, Pro and Trp, (ii) benzoyl-Gly-Xxx-Gly, where Xxx = Gly, Ala, Leu, Phe, Tyr, Met and Trp, and (iii) benzoyl-Xxx-Gly-Gly, where Xxx = Gly, Ala, Val, Leu, Ile, Phe, Tyr, Met, Pro and Trp. C-Terminal y-type ions and N-terminal a- and b-type ions were noted in all three cases. For benzoyl-Gly-Gly-Xxx, a linear relationship between log (y1/b2) and the proton affinity of the C-terminal amino acid substituents was found: as the proton affinity of the C-terminal residue increases, the fraction of y1 ion formation increases. A similar relationship was noted for the benzoyl-Xxx-Gly-Gly tripeptides between log (y2/b1) and the proton affinity of the N-terminal amino acid substituent: as the proton affinity of the N-terminal residue increases, the fraction of b1 ion formation increases. For the series benzoyl-Gly-Xxx-Gly, these relationships did not hold true. These observations point to similar reaction pathways throughout the benzoyl-Gly-Gly-Xxx series and also similar pathways throughout the benzoyl-Xxx-Gly-Gly, but pathways that are substituent dependent for benzoyl-Gly-Xxx-Gly. The increased correlation coefficients for benzoyl-Gly-Gly-Xxx and benzoyl-Xxx-Gly-Gly when compared with the free tripeptides, suggest that fewer interfering competitive reactions exist, as fewer possibilities for internal hydrogen bonding exist in the N-benzoyl derivatives versus the free compounds.

  在一台混合串联质谱仪上，研究了三种系列的质子化N-苯甲酰三肽离子的骨架断裂：（i）苯甲酰-Gly-Gly-Xxx，其中Xxx = Gly、Ala、Val、Leu、Ile、Phe、Tyr、Met、Glu、Pro和Trp，（ii）苯甲酰-Gly-Xxx-Gly，其中Xxx = Gly、Ala、Leu、Phe、Tyr、Met和Trp，以及（iii）苯甲酰-Xxx-Gly-Gly，其中Xxx = Gly、Ala、Val、Leu、Ile、Phe、Tyr、Met、Pro和Trp。在所有三种情况下，都观察到了C端y型离子和N端a型及b型离子。对于苯甲酰-Gly-Gly-Xxx，发现log（y1/b2）与C端氨基酸取代基的质子亲和力之间存在线性关系：随着C端残基的质子亲和力增加，y1离子的形成分数增加。对于苯甲酰-Xxx-Gly-Gly三肽，log（y2/b1）与N端氨基酸取代基的质子亲和力之间存在类似的关系：随着N端残基的质子亲和力增加，b1离子的形成分数增加。对于苯甲酰-Gly-Xxx-Gly系列，这些关系并不成立。这些观察结果表明，在苯甲酰-Gly-Gly-Xxx系列和苯甲酰-Xxx-Gly-Gly系列中存在类似的反应途径，但对于苯甲酰-Gly-Xxx-Gly，途径依赖于取代基。与自由三肽相比，苯甲酰-Gly-Gly-Xxx和苯甲酰-Xxx-Gly-Gly的相关系数增加，表明存在的干扰竞争反应较少，因为在N-苯甲酰衍生物中内部氢键的可能性比自由化合物少。