Phosphorylation of enkephalins: NMR and CD studies in aqueous and membrane-mimicking environments.

Phosphorylation of enkephalins: NMR and CD studies in aqueous and membrane-mimicking environments.
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DOI:
10.1111/j.1747-0285.2011.01203.x
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发表时间:
2011-11
影响因子:
3
通讯作者:
Polt R
Polt R
中科院分区:
医学4区
文献类型:
--
作者:
Yeomans L;Muthu D;Lowery JJ;Martinez HN;Abrell L;Lin G;Strom K;Knapp BI;Bidlack JM;Bilsky EJ;Polt R

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Phosphorylation of L-serine-containing enkephalin analogs has been explored as an alternative to glycosylation in an effort to increase blood-brain barrier (BBB) permeability and CNS bioavailability of peptide pharmacophores. Two enkephalin-based peptides were modified for these studies, a set related to DTLES, a mixed μ/δ-agonist, and one related to DAMGO, a highly selective μ-agonist. Each unglycosylated peptide was compared to its phosphate, its mono-benzylphosphate ester, and its β-D-glucoside. Binding was characterized in membrane preparations from CHO cells expressing human μ, δ and κ-opiate receptors (MOR, DOR and KOR). Antinociception was measured in mice using the 55°C tail flick assay. In order to estimate bioavailability, the antinociceptive effect of each opioid agonist was evaluated after intracerebroventricular (i.c.v.) or intravenous administration (i.v.) of the peptides. Circular dichroism (CD) methods and high field nuclear magnetic resonance (NMR) were used in the presence and absence of sodium dodecylsulfate (SDS) to understand how the presence of a membrane might influence the peptide conformations.
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