Amino acids and peptides. XXVIII. Synthesis of peptide fragments related to eglin c and studies on the relationship between their structure and effects on human leukocyte elastase, cathepsin G and .ALPHA.-chymotrypsin.
Various peptide fragments related to eglin c, which consists of 70 amino acid residues, were synthesized by a conventional solution method and their inhibitory effects on leukocyte elastase, cathepsin G and α-chymotrypsin were examined. Among them, H-Arg-Glu-Tyr-Phe-OMe (eglin c 22-25) and H-Ser-Pro-Val-Thr-Leu-Asp-Leu-Arg-Tyr-OMe (eglin c 41-49) inhibited cathepsin G and α-chymotrypsin but not leukocyte elastase, while H-Thr-Asn-Val-Val-OMe (eglin c 60-63) inhibited leukocyte elastase but not cathepsin G or α-chymotrypsin, although eglin c potently inhibited leukocyte elastase, cathepsin G and α-chymotrypsin. These results indicated that the interaction sites of eglin c with leukocyte elastase, cathepsin G and α-chymotrypsin might be different.
采用常规的溶液法合成了与来自家蚕血淋巴的抗蛋白酶eglin c(由70个氨基酸残基构成)相关的各种肽片段,并检验了它们对白细胞弹性蛋白酶、组织蛋白酶G和α-胰凝乳蛋白酶的抑制效应。其中,H-Arg-Glu-Tyr-Phe-OMe(eglin c 22-25)和H-Ser-Pro-Val-Thr-Leu-Asp-Leu-Arg-Tyr-OMe(eglin c 41-49)能抑制组织蛋白酶G和α-胰凝乳蛋白酶,但不能抑制白细胞弹性蛋白酶,而H-Thr-Asn-Val-Val-OMe(eglin c 60-63)能抑制白细胞弹性蛋白酶,但不能抑制组织蛋白酶G或α-胰凝乳蛋白酶,尽管eglin c对白细胞弹性蛋白酶、组织蛋白酶G和α-胰凝乳蛋白酶都具有强抑制作用。这些结果提示,eglin c与白细胞弹性蛋白酶、组织蛋白酶G和α-胰凝乳蛋白酶的相互作用部位可能各不相同。
Synthesis and biological evaluation of analogs of Pro-Leu-Gly-NH2 modified at the leucyl residue
作者:Rodney L. Johnson、Roger J. Bontems、Kaipeen E. Yang、Ram K. Mishra
DOI:10.1021/jm00168a045
日期:1990.6
analogues were tested for their ability to enhance the binding of the dopamine receptor agonist 2-amino-6,7-dihydroxy-1,2,3,4-tetrahydronaphthalene (ADTN) to striatal dopamine receptors. Two of the above analogues, Pro-Ahx-Gly-NH2 (3) and Pro-Phe-Gly-NH2 (6), showed significant activity in this assay system. Pro-Ahx-Gly-NH2 produced a 16% enhancement of ADTN binding at 0.1 microM, while Pro-Phe-Gly-NH2
In view of developing alternatives to classical peptidesynthesis strategies that suffer from low efficacy and negative environmental impact, the reactivity of N-protected α-amino acids, amino esters, and N-ethyl-N′-(3-dimethylaminopropyl)carbodiimide was studied under liquid-assisted grinding (LAG) conditions. The optimal reaction conditions enabled the intensive and environmentally benign mechanosynthesis
using solvent-less techniques such as ballmilling, a hexapeptide was synthesized in gram scale without using any toxic solvents. To date, this hexapeptide is the largest precisely controlled amino acid sequence ever synthesized in a ballmill. This study paves the way to future developments for the synthesis of longer peptides (and proteins) by using ballmilling.
An amino acid N-derivatising group that can be coloured on demand
作者:Andrew D. Abell、Derek C. Martyn、Barnaby C.H. May、Brent K. Nabbs
DOI:10.1016/s0040-4039(02)00625-1
日期:2002.5
A method is presented whereby an amino acid is reacted with 5-formyl-1H-pyrrole-2-carboxylic acid to give an N-derivatised tag that has a latent ability to be coloured. A characteristic red pyrrolizin-3-one (coloured tag) is then revealed on treatment with hydrocinnamoyl chloride. This sequence has been carried out on amino acids in solution, and on solid phase, and also on dipeptides.