Val-(S,S)-Sta-Ala-Phe-OMe hydrochloride | 84851-32-1

• 分子结构分类: 有机化合物 - 有机酸及其衍生物 - 肽模拟物
• 英文名称: Val-(S,S)-Sta-Ala-Phe-OMe hydrochloride
• CAS: 84851-32-1
• 化学式: C₂₆H₄₂N₄O₆*ClH
• 分子量: 543.104
• InChiKey: HEMXFZCXBIHXLY-RGIKYKLXSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.08
• 重原子数：
  37.0
• 可旋转键数：
  14.0
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.62
• 拓扑面积：
  159.85
• 氢给体数：
  5.0
• 氢受体数：
  7.0

反应信息

• 作为反应物：
  描述：

  Val-(S,S)-Sta-Ala-Phe-OMe hydrochloride 在 盐酸 、 1-羟基苯并三唑 、 N,N-二异丙基乙胺 、 N,N'-二环己基碳二亚胺 作用下， 以 二氯甲烷 、 乙酸乙酯 、 N,N-二甲基甲酰胺 为溶剂， 反应 4.0h， 生成 2-amino-L-phenylalanylglycyl-L-valyl-4(S)-amino-3(S)-hydroxy-6-methylheptanoyl-L-alanyl-L-phenylalanine methyl ester hydrochloride
  参考文献：
  名称：

  Inhibition of porcine pepsin by two substrate analogs containing statine. The effect of histidine at the P2 subsite on the inhibition of aspartic proteinases

  摘要：

  Two new inhibitors, 4 and 5, of the aspartic proteinase porcine pepsin were synthesized. These compounds, which span the P4-P'3 binding subsites of the enzyme, were derived by replacing the Nph-Phe dipeptidyl unit of a good pepsin substrate, H2N-Phe-Gly-His-Nph-Phe-Ala-Phe-OMe (3), with statine [(3S,4S)-4-amino-3-hydroxy-6-methylheptanoic acid, Sta]. Hexapeptide 5, H2N-Phe-Gly-Val-(S,S)-Sta-Ala-Phe-OMe, is an extremely potent inhibitor of pepsin with a Ki value less than 1 nM. This result is consistent with the proposal that statine functions as a bioisosteric replacement for a substrate dipeptidyl unit. Compound 4, which contains His at P2, is 2 orders of magnitude less active than the valine analogue 5 (Ki = 150 nM). The factor for the decrease in binding to pepsin effected by replacement of Val by His at P2 parallels the ratio of protonated vs unprotonated imidazole group in peptide 4 at pH 4, according to the Henderson-Hasselbach equation. This result suggests that a positively charged side chain at P2 is undesirable for maximum pepsin inhibition. Kinetic constants for several known inhibitors of pepsin and renin are presented that demonstrate that the effect of His incorporation at P2 on pepsin inhibition depends upon the peptide sequence and that the effect is considerably different for renin inhibitors. We further suggest that the high selectivity of potent renin inhibitors known to be only weak pepsin and cathepsin D inhibitors is due in part to the extent of histidine protonation at P2 arising from pH differences in the inhibition kinetics assay of renin (neutral conditions) compared to other aspartic proteinases (acid pH 2-4).

  DOI：

  10.1021/jm00398a022
• 作为产物：
  描述：

  N-(tert-butyloxycarbonyl)-L-valyl-4(S)-amino-3(S)-hydroxy-6-methylheptanoyl-L-alanyl-L-phenylalanine methyl ester 在 盐酸 作用下， 以 1,4-二氧六环 为溶剂， 反应 1.0h， 生成 Val-(S,S)-Sta-Ala-Phe-OMe hydrochloride
  参考文献：
  名称：

  Inhibition of porcine pepsin by two substrate analogs containing statine. The effect of histidine at the P2 subsite on the inhibition of aspartic proteinases

  摘要：

  Two new inhibitors, 4 and 5, of the aspartic proteinase porcine pepsin were synthesized. These compounds, which span the P4-P'3 binding subsites of the enzyme, were derived by replacing the Nph-Phe dipeptidyl unit of a good pepsin substrate, H2N-Phe-Gly-His-Nph-Phe-Ala-Phe-OMe (3), with statine [(3S,4S)-4-amino-3-hydroxy-6-methylheptanoic acid, Sta]. Hexapeptide 5, H2N-Phe-Gly-Val-(S,S)-Sta-Ala-Phe-OMe, is an extremely potent inhibitor of pepsin with a Ki value less than 1 nM. This result is consistent with the proposal that statine functions as a bioisosteric replacement for a substrate dipeptidyl unit. Compound 4, which contains His at P2, is 2 orders of magnitude less active than the valine analogue 5 (Ki = 150 nM). The factor for the decrease in binding to pepsin effected by replacement of Val by His at P2 parallels the ratio of protonated vs unprotonated imidazole group in peptide 4 at pH 4, according to the Henderson-Hasselbach equation. This result suggests that a positively charged side chain at P2 is undesirable for maximum pepsin inhibition. Kinetic constants for several known inhibitors of pepsin and renin are presented that demonstrate that the effect of His incorporation at P2 on pepsin inhibition depends upon the peptide sequence and that the effect is considerably different for renin inhibitors. We further suggest that the high selectivity of potent renin inhibitors known to be only weak pepsin and cathepsin D inhibitors is due in part to the extent of histidine protonation at P2 arising from pH differences in the inhibition kinetics assay of renin (neutral conditions) compared to other aspartic proteinases (acid pH 2-4).

  DOI：

  10.1021/jm00398a022

文献信息

• Synthesis of analogs of pepstatin. Effect of structure in subsites P1', P2', and P2 on inhibition of porcine pepsin
  作者：Daniel H. Rich、Francesco G. Salituro

  DOI：10.1021/jm00360a022

  日期：1983.6

  A series of pepstatin analogues having structural variations in the P2', P1', and P2 positions have been synthesized and tested for inhibition of porcine pepsin. The standard peptide for this study was Iva-Sta-Val-Ala-Iaa. Structural variations in the P2' and P1' positions have relatively little effect on Ki; however, small variations in the P2 position have a more dramatic effect on Ki and time-dependent

  已经合成了一系列在P2′，P1′和P2位置具有结构变化的胃抑素类似物，并测试了其对猪胃蛋白酶的抑制作用。这项研究的标准肽是Iva-Sta-Val-Ala-Iaa。P2'和P1'位置的结构变化对Ki的影响相对较小；然而，P2位置的微小变化对Ki和时间依赖性抑制具有更显着的影响。还合成了一系列胃抑素片段，并测试了其对猪胃蛋白酶的抑制作用。