N-Terminal Protein Tails Act as Aggregation Protective Entropic Bristles: The SUMO Case

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• 作者：Ricardo Gra帽a-Montes ; Patrizia Marinelli ; David Reverter ; Salvador Ventura
• 刊名：Biomacromolecules
• 出版年：2014
• 出版时间：April 14, 2014
• 年：2014
• 卷：15
• 期：4
• 页码：1194-1203
• 全文大小：625K
• 年卷期：v.15,no.4(April 14, 2014)
• ISSN：1526-4602

文摘

The formation of 尾-sheet enriched amyloid fibrils constitutes the hallmark of many diseases but is also an intrinsic property of polypeptide chains in general, because the formation of compact globular proteins comes at the expense of an inherent sequential aggregation propensity. In this context, identification of strategies that enable proteins to remain functional and soluble in the cell has become a central issue in chemical biology. We show here, using human SUMO proteins as a model system, that the recurrent presence of disordered tails flanking globular domains might constitute yet another of these protective strategies. These short, disordered, and highly soluble protein segments would act as intramolecular entropic bristles, reducing the overall protein intrinsic aggregation propensity and favoring thus the attainment and maintenance of functional conformations.