L-methionylglycyl-L-leucyl-L-prolyl-S-hexadecyl-d33-L-cysteine methyl ester | 947515-09-5

• 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: L-methionylglycyl-L-leucyl-L-prolyl-S-hexadecyl-d33-L-cysteine methyl ester
• CAS: 947515-09-5
• 化学式: C₃₈H₇₁N₅O₆S₂
• 分子量: 790.882
• InChiKey: VJJLZEUREMYMIY-IEWGHSMBSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  5.58
• 重原子数：
  51.0
• 可旋转键数：
  31.0
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.87
• 拓扑面积：
  159.93
• 氢给体数：
  4.0
• 氢受体数：
  9.0

反应信息

• 作为反应物：
  描述：

  N-tert-butyloxycarbonylglycyl-S-hexadecyl-d33-L-cysteine 、 L-methionylglycyl-L-leucyl-L-prolyl-S-hexadecyl-d33-L-cysteine methyl ester 在 1-羟基苯并三唑 、 1-(3-二甲基氨基丙基)-3-乙基碳二亚胺 、 三乙胺 作用下， 以 二氯甲烷 为溶剂， 反应 18.0h， 以28%的产率得到N-tert-butyloxycarbonylglycyl-S-hexadecyl-d33-L-cysteine-L-methionylglycyl-L-leucyl-L-prolyl-S-hexadecyl-d33-L-cysteine methyl ester
  参考文献：
  名称：

  Lipid Modifications of a Ras Peptide Exhibit Altered Packing and Mobility versus Host Membrane as Detected by ²H Solid-State NMR

  摘要：

  The human N-ras protein binds to cellular membranes by insertion of two covalently bound posttranslational lipid modifications, which is crucial for its function in signal transduction and cell proliferation. Mutations in ras may lead to unregulated cell growth and eventually cancer, making it an important therapeutic target. Here we have investigated the molecular details of the membrane binding mechanism. A heptapeptide derived from the C-terminus of the human N-ras protein was synthesized including two hexadecyl modifications. Solid-state H-2 NMR was used to determine the packing and molecular dynamics of the ras lipid chains as well as the phospholipid matrix. Separately labeling the chains of the peptide and the phospholipids with H-2 enabled us to obtain atomically resolved parameters relevant to their structural dynamics. While the presence of ras only marginally affected the packing of DMPC membranes, dramatically lower order parameters (S-CD) were observed for the ras acyl chains indicating modified packing properties. Essentially identical projected lengths of the 16:0 ras chains and the 14:0 DMPC chains were found, implying that the polypeptide backbone is located at the lipid-water interface. Dynamical properties of both the ras and phospholipid chains were determined from spin-lattice H-2 relaxation (R-1Z) measurements. Plots of R-1Z rates versus the corresponding squared segmental order parameters revealed striking differences. We propose the ras peptide is confined to microdomains containing DMPC chains which are in exchange with the bulk bilayer on the H-2 NMR time scale (similar to 10(-5)s). Compared to the host DMPC matrix, the ras lipid modifications are extremely flexible and undergo relatively large amplitude motions. It is hypothesized that this flexibility is a requirement for the optimal anchoring of lipid-modified proteins to cellular membranes.

  DOI：

  10.1021/ja051856c
• 作为产物：
  描述：

  S-hexadecyl-d33-L-cysteine methyl ester 在 茴香硫醚 、 1-羟基苯并三唑 、 1-(3-二甲基氨基丙基)-3-乙基碳二亚胺 、 三乙胺 、 三氟乙酸 作用下， 以 二氯甲烷 、 氯仿 为溶剂， 反应 21.0h， 生成 L-methionylglycyl-L-leucyl-L-prolyl-S-hexadecyl-d33-L-cysteine methyl ester
  参考文献：
  名称：

  Lipid Modifications of a Ras Peptide Exhibit Altered Packing and Mobility versus Host Membrane as Detected by ²H Solid-State NMR

  摘要：

  The human N-ras protein binds to cellular membranes by insertion of two covalently bound posttranslational lipid modifications, which is crucial for its function in signal transduction and cell proliferation. Mutations in ras may lead to unregulated cell growth and eventually cancer, making it an important therapeutic target. Here we have investigated the molecular details of the membrane binding mechanism. A heptapeptide derived from the C-terminus of the human N-ras protein was synthesized including two hexadecyl modifications. Solid-state H-2 NMR was used to determine the packing and molecular dynamics of the ras lipid chains as well as the phospholipid matrix. Separately labeling the chains of the peptide and the phospholipids with H-2 enabled us to obtain atomically resolved parameters relevant to their structural dynamics. While the presence of ras only marginally affected the packing of DMPC membranes, dramatically lower order parameters (S-CD) were observed for the ras acyl chains indicating modified packing properties. Essentially identical projected lengths of the 16:0 ras chains and the 14:0 DMPC chains were found, implying that the polypeptide backbone is located at the lipid-water interface. Dynamical properties of both the ras and phospholipid chains were determined from spin-lattice H-2 relaxation (R-1Z) measurements. Plots of R-1Z rates versus the corresponding squared segmental order parameters revealed striking differences. We propose the ras peptide is confined to microdomains containing DMPC chains which are in exchange with the bulk bilayer on the H-2 NMR time scale (similar to 10(-5)s). Compared to the host DMPC matrix, the ras lipid modifications are extremely flexible and undergo relatively large amplitude motions. It is hypothesized that this flexibility is a requirement for the optimal anchoring of lipid-modified proteins to cellular membranes.

  DOI：

  10.1021/ja051856c