增强朊病毒衍生短肽序列催化活性的金属辅助因子。

4区 生物学 Q3 Biochemistry, Genetics and Molecular Biology
Methods in enzymology Pub Date : 2024-01-01 Epub Date: 2024-03-28 DOI:10.1016/bs.mie.2024.02.003
Nimisha A Mavlankar, Antarlina Maulik, Asish Pal
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引用次数: 0

摘要

开发能有效催化生化反应的生物分子酶模拟物,对于大规模生产工业用生物催化剂至关重要。在这方面,淀粉样肽可作为合适的自组装支架,提供稳定的高比表面积纳米结构,促进生物催化。考虑到组氨酸和酪氨酸分别位于肽序列外围和内核时的催化和金属结合亲和力,我们在此合理地设计了两种淀粉样蛋白生成肽异构体:"Fmoc-VYYAHH (1) "和 "Fmoc-VHHAYY (2)"。为了实现设计金属酶模拟物的最终目标,我们选择 Co2+ 和 Cu2+ 作为二价过渡金属阳离子与肽络合,以帮助催化反应。在优化了先天性多肽的自组装后,我们研究了金属与多肽的结合率和配位,最终选择了适合生物催化的 1:1 多肽金属复合物。当外围存在酪氨酸时,金属肽作为酰基酯酶的催化剂作用优于先天性肽。通过将数据拟合到 Michaelis-Menten 和 Lineweaver Burk 图中,计算出了评估水解速率的动力学参数。催化活性的改变取决于肽金属复合物的稳定性。本章中提到的方案细致地涵盖了设计、合成、自组装和酶动力学。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Metal co-factors to enhance catalytic activity of short prion-derived peptide sequences.

Development of biomolecular enzyme mimics to efficiently catalyse biochemical reactions are of prime relevance for the bulk scale production of industrially relevant biocatalyst. In this regard, amyloidogenic peptides act as suitable self-assembling scaffolds, providing stable nanostructures with high surface area facilitating biocatalysis. Herein, we rationally design two positional amyloidogenic peptide isomers, "Fmoc-VYYAHH (1)" and "Fmoc-VHHAYY (2)" considering catalytic and metal binding affinity of histidine and tyrosine when placed in periphery vs. inner core of the peptide sequence. With an ultimate objective of designing metalloenzyme mimic, we choose Co2+ and Cu2+ as divalent transition metal cations for peptide complexation to aid in catalysis. After optimizing self-assembly of innate peptides, we investigate metal-peptide binding ratio and co-ordination, finally selecting 1:1 peptide metal complex suitable for biocatalysis. Metallopeptides act as better catalysts than the innate peptides as acyl esterase when tyrosines were present at the periphery. Kinetic parameters for assessing hydrolysis rate were calculated by fitting data into Michaelis-Menten and Lineweaver Burk plots. Catalytic activity is altered depending on the stability of peptide metal complexes. 2-Cu acting as the best biocatalyst with a kcat/KM = 0.08 M/s. The protocols mentioned in this chapter meticulously cover the design, synthesis, self-assembly and enzyme kinetics.

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来源期刊
Methods in enzymology
Methods in enzymology 生物-生化研究方法
CiteScore
2.90
自引率
0.00%
发文量
308
审稿时长
3-6 weeks
期刊介绍: The critically acclaimed laboratory standard for almost 50 years, Methods in Enzymology is one of the most highly respected publications in the field of biochemistry. Each volume is eagerly awaited, frequently consulted, and praised by researchers and reviewers alike. Now with over 500 volumes the series contains much material still relevant today and is truly an essential publication for researchers in all fields of life sciences, including microbiology, biochemistry, cancer research and genetics-just to name a few. Five of the 2013 Nobel Laureates have edited or contributed to volumes of MIE.
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