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一种模拟水解酶的肽两亲分子的开发及其在二氧化硅表面的固定化用于立体选择性和增强催化作用。

Development of a hydrolase mimicking peptide amphiphile and its immobilization on silica surface for stereoselective and enhanced catalysis.

作者信息

Dowari Payel, Kumar Baroi Malay, Das Tanushree, Kanti Das Basab, Das Saurav, Chowdhuri Sumit, Garg Avinash, Debnath Ananya, Das Debapratim

机构信息

Department of Chemistry, Indian Institute of Technology Guwahati, North Guwahati, Assam 781039, India.

Department of Chemistry, Indian Institute of Technology Jodhpur, Jodhpur 342037, India.

出版信息

J Colloid Interface Sci. 2022 Jul 15;618:98-110. doi: 10.1016/j.jcis.2022.03.076. Epub 2022 Mar 19.

Abstract

Biocatalysis is an important area of modern research and is extensively explored by various industries to attain greener methods in various applications. Supramolecular interactions of short peptides have been under the scanner for developing artificial smart materials inspired from natural systems. Peptide-based artificial enzymes have been proved to show various enzyme-like activities. Therefore, immobilization of catalytic peptides on solid surfaces can be an extremely useful breakthrough for development of cost-effective catalytic formulations. In this work, a series of peptide amphiphiles (PAs) have been systematically analyzed to find the most effective catalyst with esterase like activity. The PA, containing a catalytic triad, 'Asp(Ser)His' in a branched manner, was further immobilized onto silica nanoparticles through covalent bonding method to obtain surface coated catalytic silica nanoparticles. The heterogenous catalytic formulation not only showed enhanced esterase activity than the self-assembled PA in homogenous phase, but also exceeded the activity of natural CV lipase. The catalytic formulation showed high stereoselectivity towards chiral esters. Moreover, the catalyst remained stable at higher temperature, in presence of various denaturant and retained its activity after several catalytic cycles. The ease of separation, robust nature, reusability and high stereoselectivity of the catalyst opens up the possibility of creating new generation heterogeneous catalysts for further industrial applications.

摘要

生物催化是现代研究的一个重要领域,各行业广泛探索该领域以在各种应用中实现更绿色的方法。短肽的超分子相互作用一直是开发受自然系统启发的人工智能材料的研究重点。基于肽的人工酶已被证明具有多种类酶活性。因此,将催化肽固定在固体表面可能是开发具有成本效益的催化制剂的一项极其有用的突破。在这项工作中,对一系列肽两亲物(PAs)进行了系统分析,以找到具有酯酶样活性的最有效催化剂。含有催化三联体“Asp(Ser)His”且呈分支状的PA,通过共价键合法进一步固定在二氧化硅纳米颗粒上,以获得表面包覆的催化二氧化硅纳米颗粒。这种多相催化制剂不仅在均相中比自组装的PA表现出更高的酯酶活性,而且超过了天然CV脂肪酶的活性。该催化制剂对手性酯表现出高立体选择性。此外,该催化剂在较高温度下、在各种变性剂存在的情况下仍保持稳定,并且在几个催化循环后仍保留其活性。该催化剂易于分离、性质稳定、可重复使用且具有高立体选择性,为进一步的工业应用创造新一代多相催化剂开辟了可能性。

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