Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Department of Biotechnology

A facile and eco-friendly hydrothermal method was used to prepare carbon quantum dots (CQDs) using orange waste peels. The synthesized CQDs were well dispersed and the average diameter was 2.9 ± 0.5 nm. Functional group identification of the CQDs was confirmed by Fourier transform infrared spectrum analysis. Fluorescence properties of the synthesized CQDs exhibited blue emission. The fluorescence quantum yield of the CQDs was around 11.37% at an excitation wavelength of 330 nm. The higher order nonlinear optical properties were examined using a Z-scan technique and a continuous wave laser that was operated at a wavelength of 532 nm. Results demonstrated that the synthesis of CQDs can be considered as promising for optical switching devices, bio-scanning, and bio-imaging for optoelectronic applications. © 2019 John Wiley & Sons, Ltd.

World University root node

Department of Analytics

School of Computer Science and Engineering

Vellore Campus

Physics

School of Advanced Sciences

Chennai Campus

School of Bio Sciences and Technology

Luminescence

Facile preparation of high fluorescent carbon quantum dots from orange waste peels for nonlinear optical applications

Protein–protein interaction (PPI) is critical for several biological functions in living cells through the formation of an interface. Therefore, it is of interest to characterize protein–protein interfaces using an updated non-redundant structural dataset of 2557 homo (identical subunits) and 393 hetero (different subunits) dimer protein complexes determined by X-ray crystallography. We analyzed the interfaces using van der Waals (vdW), hydrogen bonding and electrostatic energies. Results show that on average homo and hetero interfaces are similar. Hence, we further grouped the 2950 interfaces based on percentage vdW to total energies into dominant (≥60%) and sub-dominant (&lt;60%) vdW interfaces. Majority (92%) of interfaces have dominant vdW energy with large interface size (146 ± 87 (homo) and 137 ± 76 (hetero) residues) and interface area (1622 ± 1135 Å2 (homo) and 1579 ± 1060 Å2 (hetero)). However, a proportion (8%) of interfaces have sub-dominant vdW energy with small interface size (85 ± 46 (homo) and 88 ± 36 (hetero) residues) and interface area (823 ± 538 Å2 (homo) and 881 ± 377 Å2 (hetero)). It is found that large interfaces have two-fold more interface area and interface size than small interfaces with increasing hydrogen bonding energy to interface size. However, small interfaces have three-fold more electrostatics energy than large interfaces with increasing electrostatics to interface size. Thus, 8% of complexes having small interfaces with limited interface area and sub-dominant vdW energy are rich in electrostatics. It is interesting to observe that complexes having small interfaces are often associated with regulatory function. Hence, the observed structural features with known molecular function provide insights for the better understanding of PPI. Communicated by Ramaswamy H. Sarma. © 2019, © 2019 Informa UK Limited, trading as Taylor & Francis Group.

Journal of Biomolecular Structure and Dynamics

Small protein–protein interfaces rich in electrostatic are often linked to regulatory function

Chronic obstructive pulmonary disease is a complex pulmonary disease that causes airflow obstruction in humans. To identify the core genes in COPD pathogenesis, seven diverse microarray datasets (GSE475, GSE1122, GSE1650, GSE3212, GSE8823, GSE37768, and GSE22148) were downloaded from the gene expression omnibus database. All the datasets were analyzed independently with the R/Bioconductor package to screen the differentially expressed genes (DEGs). The gene ontology and pathway enrichment analysis were performed for the acquired DEGs using DAVID (Database for Annotation, Visualization, and Integrated Discovery). Further protein-protein interaction network was constructed for the DEGs and their potential hub genes and sub-networks were identified using Cytoscape software. From the selected seven datasets, 188 overlapped DEGs were perceived eventually based on considering the repetitive genes between at-least one dataset. Gene Ontology analysis reveals that most of the DEGs were significantly enriched in immune response, inflammatory response, extracellular region, lipid binding, cytokine, and chemokine activity. Moreover, genes from the sub-network analysis were again submitted to the DAVID server to validate the results which uncover the Toll-like receptor signaling pathway was significantly enriched and all the genes present in this pathway were likewise detected as hub genes from Cytoscape software. CXCL9, CXCL10, CXCL11, CCL4, TLR7, and SPP1 hub genes in the toll-like receptor signaling pathway were explored in this study as potential biomarker genes associated with COPD pathogenesis. © 2020 Taylor & Francis Group, LLC.

COPD: Journal of Chronic Obstructive Pulmonary Disease

Multiple Gene Expression Dataset Analysis Reveals Toll-Like Receptor Signaling Pathway is Strongly Associated With Chronic Obstructive Pulmonary Disease Pathogenesis

Tea is the most popularly consumed beverage in the world. Theaflavin and thearubigins are the key bioactive compounds of black tea that have anticarcinogenic properties as reported in several studies. However, the epigenetic potential of these compounds has not yet been explored. DNA methyltransferase (DNMT) enzymes induce methylation of DNA at cytosine residues and play a significant role in epigenetic regulation and cancer therapy. The present study has explored the role of black tea as a DNMT inhibitor in the prevention of cancer. Herein, the effect of theaflavin has been studied in colon cancer cell line (HCT-116) and EAC-induced solid tumors in mice. It was found that theaflavin prevented cell proliferation and inhibited tumor progression as well. In silico study showed that theaflavin interacted with DNMT1 and DNMT3a enzymes and blocked their activity. Theaflavin also decreased DNMT activity In Vitro and In Vivo as evident from the DNMT activity assay. Results of immunohistochemistry revealed that theaflavin reduced DNMT expression in the tumors of mice. Taken together, our findings showed that theaflavin has a potential role as a DNMT inhibitor in HCT-116 cell line and EAC induced solid tumors in mice. © 2020 Taylor & Francis Group, LLC.

Nutrition and Cancer

Theaflavin-Containing Black Tea Extract: A Potential DNA Methyltransferase Inhibitor in Human Colon Cancer Cells and Ehrlich Ascites Carcinoma-Induced Solid Tumors in Mice

The surface protein of influenza virus, neuraminidase (NA), is believed to play a critical role in the release of new viral particle and thus spreads infection. Hence it has been considered as a possible drug target for influenza A virus infection. Despite the number of available drugs for influenza infection, the emergence of novel mutants has embellished more resistance to potent NA inhibitor. Therefore, in the present study an attempt has been made to discover potent inhibitors from ASINEX library of 467802 molecules through e-pharmacophore based virtual screening strategy. The results from our analysis along with available experimental evidences comprehend that BAS04358434 could be used as a promising candidate for NA inhibition. Moreover, the hit compound showed potent inhibitory activity against all the mutant structures considered in our analysis. Overall, we speculate that the outcomes of this research are of substantial prominence in the rational designing of novel NA inhibitors. © 2020 Inderscience Enterprises Ltd.. All rights reserved.

International Journal of Computational Biology and Drug Design

Identification of novel neuraminidase inhibitors through e-pharmacophore based virtual screening

Amyloid-A mediated (AA) amyloidosis is the pathogenic byproduct of body’s prolonged exposure to inflammatory conditions. It is described by the aggregation of mutated/misfolded serum amyloid A1 (SAA1) protein in various tissues and organs. Genetic polymorphism G90D is suspected to cause AA amyloidosis, although the causal mechanism remains cryptic. Recent experimental findings insinuate that heparan sulphate (HS), a glycosaminoglycans, exhibits binding with SAA1 to promote its aggregation. To foster the enhanced binding of HS, we computationally determined the pernicious modifications in G90D mutant SAA1 protein. Also, we examined the influence of HS on the dynamic conformation of mutant SAA1 that could potentially succor amyloidosis. Accordingly, the protein-ligand binding studies indicate that upon SNP G90D, SAA1 protein exhibited an augmented association with HS. Further, the simulation of HS bound mutant SAA1 complex delineates an increase in RMSD, Rg, and RMSF. Also, both RMSD and Rg evinced a fluctuating trajectory. Further, the complex showed increase of beta turn in its secondary structural composition. Additionally, the free energy landscape of mutant SAA1-HS complex posits the occurrence of multiple global minima conformers as opposed to the presence of a single global energy minima conformation in native SAA1 protein. In conclusion, the aforementioned conformational ramifications induced by HS on SAA1 could potentially be the proteopathic incendiary behind AA amyloidosis; this incendiary will need to be considered in future studies for developing effective therapeutics against AA amyloidosis. Communicated by Ramaswamy H. Sarma. © 2020 Informa UK Limited, trading as Taylor & Francis Group.

Investigating the pernicious effects of heparan sulfate in serum amyloid A1 protein aggregation: a structural bioinformatics approach

An organism exposed to a plethora of environmental perturbations undergoes proteomic changes which enable the characterization of total proteins in it. Much of the proteomic information is obtained from genomic data. Additional information on the proteome such as posttranslational modifications, protein–protein interactions, protein localization, metabolic pathways, and so on are deduced using proteomic tools which genomics and transcriptomics fail to offer. The proteomic analysis allows identification of precise changes in proteins, which in turn solve the complexity of microbial population providing insights into the microbial metabolism, cellular pathways, and behavior of microorganisms in new environments. Furthermore, they provide clues for the exploitation of their special features for biotechnological applications. Numerous techniques for the analysis of microbial proteome such as electrophoretic, chromatographic, mass spectrometric-based methods as well as quantitative proteomics are available which facilitate protein separation, expression, identification, and quantification of proteins. An understanding of the potential of each of the proteomic tools has created a significant impact on diverse microbiological aspects and the same has been discussed in this review. © 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Journal of Basic Microbiology

Potential of proteomics to probe microbes

The effect of macro and micronutrients of media components on lipase production by Bacillus sp. VITL8 was investigated using classical as well as statistical methods. Initially, the carbon source, nitrogen source, inducer and metal ions that affect lipase production were selected using the classical approach. Subsequently, selected nutrients along with other key factors (such as pH, agitation rate, gum acacia and tween 80) were investigated using Placket Burman design. Finally, three significant factors, viz., olive oil, peptone and tween 80 were studied using a 22 full factorial central composite design. Under optimized condition [6% (v/v) of olive oil, 0.7% peptone, 0.9% tween 80 and 25 h of incubation], the enzyme production was found to be 2.2 times higher with an overall enzyme production of 325.0 ± 1.4 U mL−1. Laboratory scale experiment proved that the enzyme could be utilized for pretreatment of food industry effluent rich in fat and oil (dairy, bakery and poultry). The enzyme was capable of hydrolyzing more than 50% of the initial fat present in all these effluents and enabled the reduction in the levels of biological oxygen demand (BOD) and chemical oxygen demand (COD) of the effluent samples. The study thus reveals the utility of the lipase produced by the halotolerant bacterium Bacillus sp. VITL8 in the pretreatment of industrial effluents contaminated with oil and fat.Highlights Lipase production was enhanced by 2.2-fold using statistical methods One of the few reports on lipase production by a halotolerant bacterium, especially by Bacillus sp. Production of 325.0 ± 1.4 U mL−1 lipase within 25 h by a halotolerant bacterium Pretreatment of food industry effluents using Bacillus sp. VITL8 lipase Improvement in effluent quality within 8 h of treatment. © 2020 Taylor & Francis Group, LLC.

Preparative Biochemistry and Biotechnology

Optimization of extracellular lipase production by halotolerant Bacillus sp. VITL8 using factorial design and applicability of enzyme in pretreatment of food industry effluents

Background: Nε-acetyl L-α lysine is an unusual acetylated di-amino acid synthesized and accumulated by certain halophiles under osmotic stress. Osmolytes are generally known to protect proteins and other cellular components under various stress conditions. Objective: The structural and functional stability imparted by Nε-acetyl L-lysine on proteins were unknown and hence was studied and compared to other commonly known bacterial osmolytes-ectoine, proline, glycine betaine, trehalose and sucrose. Methods: Effects of osmolytes on the temperature and pH profiles, pH stability and thermodynamic stability of the model enzyme, α-amylase were analyzed. Results: At physiological pH, all the osmolytes under study increased the optimal temperature for enzyme activity and improved the thermodynamic stability of the enzyme. At acidic conditions (pH 3.0), Nε-acetyl L-α lysine and ectoine improved both the catalytic and thermodynamic stability of the enzyme; it was reflected in the increase in residual enzyme activity after incubation of the enzyme at pH 3.0 for 15 min by 60% and 63.5% and the midpoint temperature of unfolding transition by 11°C and 10°C respectively. Conclusion: Such significant protective effects on both activity and stability of α-amylase imparted by addition of Nε-acetyl L-α lysine and ectoine at acidic conditions make these osmolytes interesting candidates for biotechnological applications. © 2020 Bentham Science Publishers.

Protein and Peptide Letters

Nε-acetyl l-α lysine improves activity and stability of α-amylase at acidic conditions: A comparative study with other osmolytes

Nonlinear optical nanoparticles of Zn/Cu/Al2O4 were synthesized by microwave-assisted combustion method with different fuel to oxidizer ratio. And, these nanoparticles were characterized by various analytical techniques to examine their suitability in fascinating applications. XRD results enunciate that the nanoparticle crystallizes in cubic spinel structure. The morphology and quantitative chemical compositions of Zn, Cu, Al and O elements were obtained from SEM with EDAX analysis. The prepared compound was confirmed by FTIR spectrum. The optical energy bandgaps are studied from UV–Vis absorption spectra. The luminescence emission peaks are observed at 371 nm (Violet), 425 nm (violet), 471 nm (blue) and 637 nm (red). In the application point of view from the Z-scan technique, the third order nonlinear optical parameters such as nonlinear refractive index (n2), nonlinear absorption coefficient (β), and third-order nonlinear susceptibility (χ3) of title compound are calculated. For biological application, the antibacterial activities were tested against Bacillus cereus, Staphylococcus aureus, Shigella flexneri, and Vibrio cholera bacterial species by measuring the inhibition zone. Existing results point out that the synthesized Zn/Cu/Al2O4 nanoparticles are possible candidates for photonics devices, optical switches, optical limiting and also for pharmaceutical applications. © 2019 The Author(s)