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首页> 外文期刊>Biochemistry >Molecular Modeling Studies of Peptide Inhibitors Highlight the Importance of Conformational Prearrangement for Inhibition of Calpain
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Molecular Modeling Studies of Peptide Inhibitors Highlight the Importance of Conformational Prearrangement for Inhibition of Calpain

机译:肽抑制剂的分子建模研究突显了构象预安排对抑制钙蛋白酶的重要性

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The overexpression of the cysteine protease calpain is associated with many diseases, includingnbrain trauma, spinal cord injury, Alzheimer’s disease, Parkinson’s disease, muscular dystrophy, arthritis, andncataract. Calpastatin is the naturally occurring specific regulator of calpain activity. It has previously beennreported that a 20-mer peptide truncated from region B of calpastatin inhibitory domain 1 (named CP1B)nretains both the affinity and selectivity of calpastatin toward calpain, exhibiting a Ki of 26 nM againstnμ-calpain, and is 1000-foldmore selective for μ-calpain than cathepsin L. Both thewild-type and β-AlamutantnCP1B peptides exhibit a propensity to adopt a looplike conformation between Glu10 and Lys13. Ancomputational study of human wild-type CP1B and the β-Ala mutants of this peptide was conducted. Thenresulting structural predictions were compared with the crystal structure of the calpain-calpastatin complexnand were correlated with experimental IC50 values. These findings suggest that the conformational preferencenof the loop region between Glu10 and Lys13 of CP1B in the absence of calpain may contribute to theninhibitory activity of this series of peptides against calpain.
机译:半胱氨酸蛋白酶钙蛋白酶的过度表达与许多疾病有关,包括脑损伤,脊髓损伤,阿尔茨海默氏病,帕金森氏病,肌肉营养不良,关节炎和白内障。钙蛋白酶抑制素是钙蛋白酶活性的天然特异性调节剂。以前从未报道过,从钙蛋白酶抑素抑制域1的区域B截短的20-mer肽(称为CP1B)保留钙蛋白酶抑素对钙蛋白酶的亲和力和选择性,对nμ-钙蛋白酶的Ki为26 nM,并且选择性高1000倍。野生型和β-AlamutantnCP1B肽都表现出倾向于在Glu10和Lys13之间采用环状构象的倾向。进行了人类野生型CP1B和该肽的β-Ala突变体的计算研究。然后将结构预测结果与钙蛋白酶-钙蛋白酶抑制素复合物的晶体结构进行比较,并将其与实验IC50值相关联。这些发现表明,在没有钙蛋白酶的情况下,CP1B的Glu10和Lys13之间的环区的构象偏好可能有助于该系列肽对钙蛋白酶的抑制活性。

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