1
|
Chitosan-EDTA-Cellulose network as a green, recyclable and multifunctional biopolymeric organocatalyst for the one-pot synthesis of 2-amino-4H-pyran derivatives. Sci Rep 2022; 12:8642. [PMID: 35606381 PMCID: PMC9126885 DOI: 10.1038/s41598-022-10774-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2021] [Accepted: 04/13/2022] [Indexed: 12/17/2022] Open
Abstract
AbstractIn this research, cellulose grafted to chitosan by EDTA (Cs-EDTA-Cell) bio-based material is reported and characterized by a series of various methods and techniques such as FTIR, DRS-UV–Vis, TGA, FESEM, XRD and EDX analysis. In fact, the Cs-EDTA-Cell network is more thermally stable than pristine cellulose or chitosan. There is a plenty of both acidic and basic sites on the surface of this bio-based and biodegradable network, as a multifunctional organocatalyst, to proceed three-component synthesis of 2-amino-4H-pyran derivatives at room temperature in EtOH. The Cs-EDTA-Cell nanocatalyst can be easily recovered from the reaction mixture by using filtration and reused for at least five times without significant decrease in its catalytic activity. In general, the Cs-EDTA-Cell network, as a heterogeneous catalyst, demonstrated excellent catalytic activity in an environmentally-benign solvent to afford desired products in short reaction times and required simple experimental and work-up procedure compared to many protocols using similar catalytic systems.
Collapse
|
2
|
Mishra P, Basak S, Mukherjee A, Basu A. Design and Study of In Silico Binding Dynamics of Certain Isoxazole Bearing Leads Against Aβ-42 and BACE-1 Loop in Protein Fibrillation. LETT DRUG DES DISCOV 2022. [DOI: 10.2174/1570180818666210813120444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Aims:
Design isoxazole bearing leads as dual inhibitors against Amyloid β and BACE-1 loop
in protein fibrillation.
Background:
Protein fibrillation is one of the key reasons for several diseases, namely Alzheimer’s, Parkinson’s,
and many others. One of the key strategies of preventing protein fibrillation is destabilizing the
protein fibrils themselves or inhibiting the amyloid fibril-forming pathway in the initial stage.
Introduction:
Attempts have been taken to design newer leads to inhibit protein fibrillation by targeting
the β-amyloidogenesis pathway in the brain. To exploit interfenestration between Amyloid β -42 protein
and BACE-1 (β-site amyloid precursor protein cleaving enzyme) for amyloidogenesis, studies are undertaken
to design dual inhibitors against the same.
Method:
In vitro binding interactions were found using docking, de novo ligand design, and MD simulation
study.
Results:
Three compounds bearing an isoxazole heterocyclic nucleus were designed which could successfully
bind to the hydrophobic raft and salt bridge residues Asp 23-Lys-26 of Amyloid β, destabilizing the
growing fibril. Additionally, one of our candidate compounds exhibited force of interaction with Thr232
at the S3 pocket of BACE-1, interacted with key residue Asp228, Tyr71, and Thr72 of the β-hairpin flap
and hydrogen bonding with Gly11 at loop 10s.
Conclusion:
Protein flexibility dynamics of the Aβ-42 protein revealed that there is a considerable conformational
change of the same with or without ligand binding. The lower RMSF of the bound region and
reprogramming residual contacts within the Aβ-42 protein suggested successful binding of the ligand with
the protein, lowering the access for further β-β dimerization.
Collapse
Affiliation(s)
- Puja Mishra
- Dr. B.C. Roy College of Pharmacy & Allied Health Sciences, Durgapur, WB, India
| | - Souvik Basak
- Dr. B.C. Roy College of Pharmacy & Allied Health Sciences, Durgapur, WB, India
| | - Arup Mukherjee
- Department of Biotechnology, Maulana Abul Kalam Azad University of Technology, Kolkata, WB, India
| | - Anindya Basu
- School of Pharmaceutical Sciences, Rajiv
Gandhi Proudyogiki Vishwavidyalaya, Bhopal, India
| |
Collapse
|