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
中科院分区:
文献类型:
--
作者:
Sugg,EE;Castrucci,AM;Hadley,ME;vanBinst,G;Hruby,VJ
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
作者:
K. Shizume;A. Lerner;T. Fitzpatrick
通讯作者:
T. Fitzpatrick
影响因子:
2.9
作者:
C. Wynants;G. Van Binst
通讯作者:
G. Van Binst
DOI:
10.1111/j.1399-3011.1982.tb02663.x
发表时间:
2009
期刊:
International journal of peptide and protein research
影响因子:
--
作者:
F. de Leeuw;C. Altona
通讯作者:
C. Altona
影响因子:
1.1
作者:
PAQUET, A
通讯作者:
PAQUET, A
DOI:
--
发表时间:
1986
期刊:
影响因子:
--
作者:
E. Sugg;W. L. Cody;Z. Abdel‐Malek;M. Hadley;V. Hruby
通讯作者:
V. Hruby