Synthesis of Unnatural LipohilicN-(9H-Fluoren-9-ylmethoxy)carbonyl-Substituted ?-Amino Acids and Their Incorporation into Cyclic RGD-Peptides: A structure-activity study
作者:Marcus Koppitz、Martin Huenges、Rainer Gratias、Horst Kessler、Simon L. Goodman、Alfred Jonczyk
DOI:10.1002/hlca.19970800423
日期:1997.6.30
Xaa = Ahd or Hd-Gly (1 or 2), a βII′/γ-turn-like arrangement with D-Phe in i+1 position of the β-turn is found. Peptides II with D-Xaa = D-Ahd or Hd-Gly (3 or 4) exhibit a βII′/γ-turn conformation with Gly in i+1 position of the β-turn, whereas II with Ahd instead of D-Xaa, i.e., lacking a D-amino acid in position 4 or 5 (5). adopts no defined conformation. However, in assays of receptor specificity
的α v /β 3整联在人类肿瘤转移和血管生成有关。已经显示了环(-Arg 1 -Gly 2 -Asp 3 -D-Phe 4 -Xaa 5 -)(I)和环(-Arg 1 -Gly 2 -Asp 3 -Phe 4 -D的序列的结构-Xaa 5 -)(II)以高亲和力结合,而后者对该受体具有高选择性。Xaa和D-Xaa残基接受各种氨基酸。在这里,我们报道了在位置5包含亲脂氨基酸Xaa或D-Xaa的环状Arg-Gly-Asp(RGD)肽的合成,活性和构象分析。对于I而言,它们是(2 S)-2-氨基十六烷酸在II,D-Ahd和Hd-Gly中添加了酸(Ahd)和N'-十六烷基甘氨酸(Hd-Gly),并且出于控制目的,并入了Ahd(图1)。对映体纯的α-氨基酸是通过非对映选择性合成和随后使用酰基转移酶I酶法分离异构体而获得的(方案)。根据Stewart的改进程序,从溴乙酸乙酯和十六烷基胺制备Hd-Gly