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Selvaraj Kunjiappan Panneerselvam Theivendren Parasuraman Pavadai Saravanan Govindaraj Murugesan Sankaranarayanan Balasubramanian Somasundaram Sankarganesh Arunachalam Sureshbabu Ram Kumar Pandian Damodar Nayak Ammunje 《Biotechnology progress》2020,36(1):e2904
The following study was done to assess the glucose utilizing efficiency of Indoloquinoxaline derivative incorporated keratin nanoparticles (NPs) in 3T3-L1 adipocytes. Indoloquinoxaline derivative had wide range of biological activities including antidiabetic activity. In this view, Indoloquinoxaline moiety containing N, N-dimethyl (3-fluoro-6H-indolo [3,2-b] quinoxalin-6-yl) methanamine compound was designed and synthesized, and further it is incorporated into keratin nanoparticles. The formulated NPs, drug entrapment efficiency, releasing capacity, stability, and physicochemical properties were characterized by various spectral analyzer and obtained results of characterizations were confirmed the properties of NPs. The analysis of mechanism underlying the glucose utilization of NPs was examined through molecular docking with identified target, and observed in silico study reports shown strong interaction of NPs in the binding pockets of AMPK and PTP1B. Based on the in silico screening, the formulated NPs was performed for in vitro cellular viability and glucose uptake studies on 3T3-L1 adipocytes. Interestingly, 40 μg of NPs displayed 78.2 ± 2.76% cellular viability, and no cell death was observed at lower concentrations. Further, the concentration dependent glucose utilization was observed at different concentrations of NPs in 3T3-L1 adipocytes. The results of NPs (40 μg) on glucose utilization have revealed eminent result 58.56 ± 4.54% compared to that of Metformin (10 μM) and Insulin (10 μM). The identified results clearly indicated that Indoloquinoxaline derivative incorporated keratin NPs significantly increased glucose utilization efficiency and protect the cells against the insulin resistance. 相似文献
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Pratichi Singh Arthi Venkatesan Parasuraman Padmanabhan Balazs Gulyas Febin Prabhu Dass J 《Journal of cellular biochemistry》2020,121(1):534-544
Hepatitis C virus (HCV) infection is among the leading causes of hepatocellular carcinoma and liver cirrhosis globally, with a high economic burden. The disease progression is well established, but less is known about the spontaneous HCV infection clearance. This study tries to establish the relationship between codon biasness and expression of HCV clearance candidate genes in normal and HCV infected liver tissues. A total of 112 coding sequences comprising 151 679 codons were subjected to the computation of codon indices, namely relative synonymous codon usage, an effective number of codon (Nc), frequency of optimal codon, codon adaptation index, codon bias index, and base compositions. Codon indices report of GC3s, GC12, hydropathicity, and aromaticity implicates both mutational and translational selection in the candidate gene set. This was further correlated with the differentially expressed genes among the selected genes using BioGPS. A significant correlation is observed between the gene expression of normal liver and cancerous liver tissues with codon bias (Nc). Gene expression is also correlated with relative codon bias values, indicating that CCL5, APOA2, CD28, IFITM1, and TNFSF4 genes have higher expression. These results are quite encouraging in selecting the high responsive genes in HCV clearance. However, there could be additional genes which could also orchestrate the clearance role with the above mentioned first line of defensive genes. 相似文献
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Differential recovery of membrane proteins after extraction by aqueous methanol and trifluoroethanol
Zhang H Lin Q Ponnusamy S Kothandaraman N Lim TK Zhao C Kit HS Arijit B Rauff M Hew CL Chung MC Joshi SB Choolani M 《Proteomics》2007,7(10):1654-1663
Cell membrane proteome analysis is limited by inherent membrane hydrophobicity. Conventional membrane protein extraction techniques use detergents, chaotropes and organic acids that require sample clean-up or pH adjustment, and are associated with significant sample loss. We extracted membrane proteins from red blood cells (RBCs) using methanol (MeOH), trifluoroethanol (TFE) and urea, and identified membrane proteins using 2-D LC coupled with MALDI-TOF/TOF-MS. We show that organic solvents MeOH- and TFE-based methods have membrane protein analysis efficiencies comparable to urea, and are complementary for the recovery of both hydrophilic and hydrophobic peptides. The mean grand average of hydropathicity (GRAVY) value of identified peptides from the TFE-based method (-0.107) was significantly higher than that of the MeOH-based method (-0.465) (p<0.001). Sequential and adjunctive use of the organic solvents MeOH and TFE increases the number of proteins identified, and the confidence of their identification. We show that this strategy is effective for shotgun membrane proteome analysis. 相似文献
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The synthesis of three novel phosphonobile acids from natural bile acids is reported. The CMC of phosphonodeoxycholic acid (PDCA) at pH 8.2 was found to be lower than that of the parent deoxycholic acid (DCA). PDCA micelles were also found to have higher microviscosity compared to DCA micelles, suggesting higher hydrophobicity and tighter packing in the interior of PDCA micelles. PDCA aggregated further to form an aqueous gel at pH 4. 相似文献
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Loganathan Ponnusamy Dawn M. Wesson Consuelo Arellano Coby Schal Charles S. Apperson 《Microbial ecology》2010,59(1):158-173
In the container habitats of immature mosquitoes, catabolism of plant matter and other organic detritus by microbial organisms
produces metabolites that mediate the oviposition behavior of Aedes aegypti and Aedes albopictus. Public health agencies commonly use oviposition traps containing plant infusions for monitoring populations of these mosquito
species, which are global vectors of dengue viruses. In laboratory experiments, gravid females exhibited significantly diminished
responses to experimental infusions made with sterilized white oak leaves, showing that attractive odorants were produced
through microbial metabolic activity. We evaluated effects of infusion concentration and fermentation time on attraction of
gravid females to infusions made from senescent bamboo or white oak leaves. We used plate counts of heterotrophic bacteria,
total counts of 4′,6-diamidino-2-phenylindole-stained bacterial cells, and 16S ribosomal DNA (rDNA) polymerase chain reaction–denaturing
gradient gel electrophoresis (DGGE) to show that changes in the relative abundance of bacteria and the species composition
of bacterial communities influenced attraction of gravid A. aegypti and A. albopictus mosquitoes to infusions. DGGE profiles showed that bacterial species composition in infusions changed over time. Principal
components analysis indicated that oviposition responses to plant infusions were in general most affected by bacterial diversity
and abundance. Analysis of bacterial 16S rDNA sequences derived from DGGE bands revealed that Proteobacteria (Alpha-, Beta-,
Delta-, and Gamma-) were the predominant bacteria detected in both types of plant infusions. Gravid A. aegypti were significantly attracted to a mix of 14 bacterial species cultured from bamboo leaf infusion. The oviposition response
of gravid mosquitoes to plant infusions is strongly influenced by abundance and diversity of bacterial species, which in turn
is affected by plant species, leaf biomass, and fermentation time. 相似文献
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Theoretical investigation on the glycan‐binding specificity of Agrocybe cylindracea galectin using molecular modeling and molecular dynamics simulation studies 下载免费PDF全文
Ponnusamy Parasuraman Veeramani Murugan Jeyasigamani F A Selvin M Michael Gromiha Kazuhiko Fukui Kasinadar Veluraja 《Journal of molecular recognition : JMR》2015,28(9):528-538
Galectins are β‐galactoside binding proteins which have the ability to serve as potent antitumor, cancer biomarker, and induce tumor cell apoptosis. Agrocybe cylindracea galectin (ACG) is a fungal galectin which specifically recognizes α(2,3)‐linked sialyllactose at the cell surface that plays extensive roles in the biological recognition processes. To investigate the change in glycan‐binding specificity upon mutations, single point and double point site‐directed in silico mutations are performed at the binding pocket of ACG. Molecular dynamics (MD) simulation studies are carried out for the wild‐type (ACG) and single point (ACG1) and double point (ACG2) mutated ACGs to investigate the dynamics of substituted mutants and their interactions with the receptor sialyllactose. Plausible binding modes are proposed for galectin–sialylglycan complexes based on the analysis of hydrogen bonding interactions, total pair‐wise interaction energy between the interacting binding site residues and sialyllactose and binding free energy of the complexes using molecular mechanics–Poisson–Boltzmann surface area. Our result shows that high contribution to the binding in different modes is due to the direct and water‐mediated hydrogen bonds. The binding specificity of double point mutant Y59R/N140Q of ACG2 is found to be high, and it has 26 direct and water‐mediated hydrogen bonds with a relatively low‐binding free energy of −47.52 ± 5.2 kcal/mol. We also observe that the substituted mutant Arg59 is crucial for glycan‐binding and for the preference of α(2,3)‐linked sialyllactose at the binding pocket of ACG2 galectin. When compared with the wild‐type and single point mutant, the double point mutant exhibits enhanced affinity towards α(2,3)‐linked sialyllactose, which can be effectively used as a model for biological cell marker in cancer therapeutics. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
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Shijun Li Min Tan Franceline Juillard Rajesh Ponnusamy Bruno Correia J. Pedro Simas Maria A. Carrondo Colin E. McVey Kenneth M. Kaye 《The Journal of biological chemistry》2015,290(47):28084-28096
Kaposi sarcoma-associated herpesvirus (KSHV) has a causative role in several human malignancies. KSHV latency-associated nuclear antigen (LANA) mediates persistence of viral episomes in latently infected cells. LANA mediates KSHV DNA replication and segregates episomes to progeny nuclei. The structure of the LANA DNA binding domain was recently solved, revealing a positive electrostatic patch opposite the DNA binding surface, which is the site of BET protein binding. Here we investigate the functional role of the positive patch in LANA-mediated episome persistence. As expected, LANA mutants with alanine or glutamate substitutions in the central, peripheral, or lateral portions of the positive patch maintained the ability to bind DNA by EMSA. However, all of the substitution mutants were deficient for LANA DNA replication and episome maintenance. Mutation of the peripheral region generated the largest deficiencies. Despite these deficiencies, all positive patch mutants concentrated to dots along mitotic chromosomes in cells containing episomes, similar to LANA. The central and peripheral mutants, but not the lateral mutants, were reduced for BET protein interaction as assessed by co-immunoprecipitation. However, defects in BET protein binding were independent of episome maintenance function. Overall, the reductions in episome maintenance closely correlated with DNA replication deficiencies, suggesting that the replication defects account for the reduced episome persistence. Therefore, the electrostatic patch exerts a key role in LANA-mediated DNA replication and episome persistence and may act through a host cell partner(s) other than a BET protein or by inducing specific structures or complexes. 相似文献
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