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Multiple 6-Bromotryptophan Residues in a Sleep-Inducing Peptide

机译:睡眠诱导肽中的多个6-溴色氨酸残基

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摘要

We have characterized a novel sleep-inducing peptide comprising 33 amino acids with three residues of the unusual posttranslationally modified amino acid,6-bromotryptophan.The peptide,termed "light sleeper" or the r7a conotoxin,was purified from the venom of the fish-hunting Conus radiatus.The light sleeper peptide has additional notable biochemical properties;it equilibrates slowly between two distinct conformers,and has four gamma-carboxyglutamate residues.The pattern of posttranslational bromination in the light sleeper peptide suggests that tryptophan residues at N- and C-termini may be preferential sites for posttranslational bromination.
机译:我们已经鉴定了一种新颖的诱导睡眠的肽,该肽包含33个氨基酸,具有三个残基,这些残基具有不同的翻译后修饰氨基酸6-溴色氨酸。该肽被称为“轻型睡眠者”或r7a芋螺毒素,是从鱼毒中提取的,轻型睡眠者肽具有其他显着的生化特性;在两个截然不同的构象异构体之间缓慢平衡,并具有四个γ-羧基谷氨酸残基。轻型睡眠者肽的翻译后溴化模式表明,N-和C-处的色氨酸残基末端可能是翻译后溴化的优先位点。

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