Cyclic lactam analogues of Ac-[Nle4]alpha-MSH4-11-NH2.

Cyclic lactam analogues of Ac-[Nle4]alpha-MSH4-11-NH2.
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Ac-[Nle4]α-MSH4-11-NH2 的环状内酰胺类似物。

DOI:
10.1021/bi00421a029
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发表时间:
1988
期刊:
影响因子:
2.9
通讯作者:
Hruby,VJ
Hruby,VJ
中科院分区:
生物学3区
文献类型:
--
作者:
Sugg,EE;Castrucci,AM;Hadley,ME;vanBinst,G;Hruby,VJ

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1988年6月29日收到的修订版摘要:α-促黑素细胞激素(-MSH)4- 11片段的两个侧链环状内酰胺类似物Ac-[Nle 4,D-Orn 5,Glu 8] a-MSH 4_n-NH 2和Ac-[Nle 4,D-Orn 5,D-Phe 7,Glu 8] a-MSH 4_u-NH 2,通过使用7V“-Boc和7V“-Fmoc合成策略与叠氮磷酸二苯酯介导的环化反应的组合,在对甲基二苯甲基胺树脂上制备。检测了这两种类似物的促黑素激素活性,并与-MSH、Ac-[Nle 4] a-MSH 4_u-NH 2和Ac-[Nle 4,D-Phe 7] a-MSH 4_u-NH 2的促黑素激素活性进行了比较。在蛙(Ranapipiens)皮肤生物测定中,L-Phe 7 17元环环状类似物比线性Ac-[Nle 4] a-MSH 4_n-NH 2稍微更有效,并且表现出延长的促黑素生物活性(> 4 h)。在该相同的测定中,D-Phe 7环状类似物的效力比L-Phe环状类似物低100倍以上,并且效力比线性Ac-[Nle 4,D-Phe 7] a-MSH 4 - 11-NH 2低10000倍。在蜥蜴皮(Anolis carolinensis)生物测定中,L-Phe 7环状类似物的效力比Ac-[Nle 4] a-MSH 4_n-NH 2低100倍,而D-Phe 7环状类似物的效力比Ac-[Nle 4] a-MSH 4_n-NH 2和D-Phe 7线性衍生物Ac-[Nle 4,D-Phe 7] a-MSH 4_n-NH 2低10000倍。通过ID和2D 500-MHz NMR光谱检查这两个环状类似物在二甲基亚砜-δ 6中的溶液构象。我们的分析表明氢键
Revised Manuscript Received June 29, 1988 abstract: Two side-chain cyclic lactam analogues of the 4-11fragment of a-melanocyte-stimulating hormone (-MSH), Ac-[Nle4, D-Orn5, Glu8] a-MSH4_n-NH2 and Ac-[Nle4, D-Orn5, D-Phe7, Glu8] a-MSH4_u-NH2, were prepared on p-methylbenzhydrylamine resin by using a combination of 7V “-Boc and 7V “-Fmoc synthetic strategies with diphenylphosphorazidate mediated cyclization. The melanotropin activities of these two analogues were examined and compared relative to those of-MSH, Ac-[Nle4] a-MSH4_u-NH2, and Ac-[Nle4, D-Phe7] a-MSH4_u-NH2. In the frog {Ranapipiens) skin bioassay, the L-Phe7 17-membered ring cyclic analogue was slightly more potent than the linear Ac-[Nle4] a-MSH4_n-NH2 and exhibited prolonged melanotropicbioactivity (^ 4 h). In this same assay, the D-Phe7 cyclic analogue was more than 100-fold less potent than the L-Phe cyclic analogue and was 10000 times less potent than linear Ac-[Nle4, D-Phe7] a-MSH4_11-NH2. In the lizard skin {Anolis carolinensis) bioassay, the L-Phe7 cyclic analogue was 100-fold less potent than Ac-[Nle4] a-MSH4_n-NH2, while the D-Phe7 cyclic analogue was 10000-fold less potent than both Ac-[Nle4] a-MSH4_u-NH2 and the D-Phe7 linear derivative Ac-[Nle4, D-Phe7] a-MSH4_n-NH2. The solution conformation of these two cyclic analogues in dimethyl sulfoxide-< f6 was examined by ID and 2D 500-MHz NMR spectroscopy. Our analysis suggests an H bond stabilized
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影响因子: 4.8
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发表时间: 2009
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DOI: --
发表时间: 1986
期刊:
影响因子: --
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