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Akremi I, Merabishvili M, Jlidi M, Haj Brahim A, Ben Ali M, Karoui A, Lavigne R, Wagemans J, Pirnay JP, Ben Ali M. Isolation and Characterization of Lytic Pseudomonas aeruginosa Bacteriophages Isolated from Sewage Samples from Tunisia. Viruses 2022; 14:v14112339. [PMID: 36366441 PMCID: PMC9698164 DOI: 10.3390/v14112339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Revised: 10/21/2022] [Accepted: 10/21/2022] [Indexed: 02/01/2023] Open
Abstract
Bacteriophages could be a useful adjunct to antibiotics for the treatment of multidrug-resistant Pseudomonas aeruginosa infections. In this study, lytic P. aeruginosa myoviruses PsCh, PsIn, Ps25, and Ps12on-D were isolated from Tunisian sewage samples. Phage Ps12on-D displayed an adsorption time of ~10 min, a short latency period (~10 min), and a large burst size (~115 PFU per infected cell) under standard growth conditions. All phages were active at broad temperature (4 °C to 50 °C) and pH (3.0 to 11.0) ranges and were able to lyse a wide variety of P. aeruginosa strains isolated from clinical and environmental samples worldwide. Illumina sequencing revealed double-stranded DNA genomes ranging from 87,887 and 92,710 bp with high sequence identity to Pseudomonas phage PAK_P1. All four phages based on sequence analysis were assigned to the Pakpunavirus genus. The presented characterization and preclinical assessment are part of an effort to establish phage therapy treatment as an alternative strategy for the management of multidrug-resistant P. aeruginosa infections in Tunisia.
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Affiliation(s)
- Ismahen Akremi
- Laboratory of Microbial Biotechnology, Enzymatics and Biomolecules (LBMEB), Center of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour km 6, P.O. Box 1177, Sfax 3018, Tunisia
- Correspondence: (I.A.); (J.-P.P.); (M.B.A.)
| | - Maya Merabishvili
- Laboratory for Molecular and Cellular Technology, Queen Astrid Military Hospital, Bruynstraat 1, B-1120 Brussels, Belgium
| | - Mouna Jlidi
- Laboratory of Microbial Biotechnology, Enzymatics and Biomolecules (LBMEB), Center of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour km 6, P.O. Box 1177, Sfax 3018, Tunisia
| | - Adel Haj Brahim
- Laboratory of Microbial Biotechnology, Enzymatics and Biomolecules (LBMEB), Center of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour km 6, P.O. Box 1177, Sfax 3018, Tunisia
| | - Manel Ben Ali
- Laboratory of Microbial Biotechnology, Enzymatics and Biomolecules (LBMEB), Center of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour km 6, P.O. Box 1177, Sfax 3018, Tunisia
- Astrum Biotech, Business Incubator, Center of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour km 6, P.O. Box 1177, Sfax 3018, Tunisia
| | - Anis Karoui
- Agrovet, Street of Tunis km 1, Soliman 8020, Tunisia
| | - Rob Lavigne
- Laboratory of Gene Technology, Department of Biosystems, KU Leuven, Kasteelpark Arenberg 21-Box 2462, B-3001 Leuven, Belgium
| | - Jeroen Wagemans
- Laboratory of Gene Technology, Department of Biosystems, KU Leuven, Kasteelpark Arenberg 21-Box 2462, B-3001 Leuven, Belgium
| | - Jean-Paul Pirnay
- Laboratory for Molecular and Cellular Technology, Queen Astrid Military Hospital, Bruynstraat 1, B-1120 Brussels, Belgium
- Correspondence: (I.A.); (J.-P.P.); (M.B.A.)
| | - Mamdouh Ben Ali
- Laboratory of Microbial Biotechnology, Enzymatics and Biomolecules (LBMEB), Center of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour km 6, P.O. Box 1177, Sfax 3018, Tunisia
- Astrum Biotech, Business Incubator, Center of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour km 6, P.O. Box 1177, Sfax 3018, Tunisia
- Correspondence: (I.A.); (J.-P.P.); (M.B.A.)
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Hadj Brahim A, Ben Ali M, Daoud L, Jlidi M, Akremi I, Hmani H, Feto NA, Ben Ali M. Biopriming of Durum Wheat Seeds with Endophytic Diazotrophic Bacteria Enhances Tolerance to Fusarium Head Blight and Salinity. Microorganisms 2022; 10:microorganisms10050970. [PMID: 35630414 PMCID: PMC9147649 DOI: 10.3390/microorganisms10050970] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 04/23/2022] [Accepted: 04/27/2022] [Indexed: 02/04/2023] Open
Abstract
There is growing interest in the use of bio inoculants based on plant growth-promoting bacteria (PGPB) to promote plant growth under biotic and abiotic stresses. Here, we provided a detailed account of the effectiveness of a number of endophytic PGPB strains, isolated from the roots of the halophyte Salicornia brachiata in promoting durum wheat growth and enhancing its tolerance to salinity and fusarium head blight (FHB) disease. Bacillus spp. strains MA9, MA14, MA17, and MA19 were found to have PGPB characteristics as they produced indole-3-acetic acid, siderophores, and lytic enzymes, fixed free atmospheric nitrogen, and solubilized inorganic phosphate in vitro. Additionally, the in vivo study that involved in planta inoculation assays under control and stress conditions indicated that all PGPB strains significantly (p < 0.05) increased the total plant length, dry weight, root area, seed weight, and nitrogen, protein, and mineral contents. Particularly, the MA17 strain showed a superior performance since it was the most efficient in reducing disease incidence in wheat explants by 64.5%, in addition to having the strongest plant growth promotion activity under salt stress. Both in vitro and in vivo assays showed that MA9, MA14, MA17, and MA19 strains were able to play significant PGPB roles. However, biopriming with Bacillus subtilis MA17 offered the highest plant growth promotion and salinity tolerance, and bioprotection against FHB. Hence, it would be worth testing the MA17 strain under field conditions as a step towards its commercial production. Moreover, the strain could be further assessed for its plausible role in bioprotection and growth promotion in other crop plants. Thus, it was believed that the strain has the potential to significantly contribute to wheat production in arid and semi-arid regions, especially the salt-affected Middle Eastern Region, in addition to its potential role in improving wheat production under biotic and abiotic stresses in other parts of the world.
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Affiliation(s)
- Adel Hadj Brahim
- Laboratory of Microbial Biotechnology and Enzymatic Engineering (LBMIE), Center of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour km 6, P.O. Box 1177, Sfax 3018, Tunisia; (M.B.A.); (L.D.); (M.J.); (I.A.); (H.H.)
- Correspondence: (A.H.B.); (M.B.A.)
| | - Manel Ben Ali
- Laboratory of Microbial Biotechnology and Enzymatic Engineering (LBMIE), Center of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour km 6, P.O. Box 1177, Sfax 3018, Tunisia; (M.B.A.); (L.D.); (M.J.); (I.A.); (H.H.)
- Astrum Biotech, Business Incubator, Center of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour km 6, P.O. Box 1177, Sfax 3018, Tunisia
| | - Lobna Daoud
- Laboratory of Microbial Biotechnology and Enzymatic Engineering (LBMIE), Center of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour km 6, P.O. Box 1177, Sfax 3018, Tunisia; (M.B.A.); (L.D.); (M.J.); (I.A.); (H.H.)
- Astrum Biotech, Business Incubator, Center of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour km 6, P.O. Box 1177, Sfax 3018, Tunisia
| | - Mouna Jlidi
- Laboratory of Microbial Biotechnology and Enzymatic Engineering (LBMIE), Center of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour km 6, P.O. Box 1177, Sfax 3018, Tunisia; (M.B.A.); (L.D.); (M.J.); (I.A.); (H.H.)
| | - Ismahen Akremi
- Laboratory of Microbial Biotechnology and Enzymatic Engineering (LBMIE), Center of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour km 6, P.O. Box 1177, Sfax 3018, Tunisia; (M.B.A.); (L.D.); (M.J.); (I.A.); (H.H.)
| | - Houda Hmani
- Laboratory of Microbial Biotechnology and Enzymatic Engineering (LBMIE), Center of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour km 6, P.O. Box 1177, Sfax 3018, Tunisia; (M.B.A.); (L.D.); (M.J.); (I.A.); (H.H.)
| | - Naser Aliye Feto
- OMICS Research Group, Department of Biotechnology, Vaal University of Technology, Vanderbijlpark 1911, South Africa;
| | - Mamdouh Ben Ali
- Laboratory of Microbial Biotechnology and Enzymatic Engineering (LBMIE), Center of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour km 6, P.O. Box 1177, Sfax 3018, Tunisia; (M.B.A.); (L.D.); (M.J.); (I.A.); (H.H.)
- Astrum Biotech, Business Incubator, Center of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour km 6, P.O. Box 1177, Sfax 3018, Tunisia
- Correspondence: (A.H.B.); (M.B.A.)
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Abdelli F, Jellali K, Anguita E, González-Muñoz M, Villalobo E, Madroñal I, Alcalde J, Ben Ali M, Elloumi-Mseddi J, Jemel I, Tebar F, Enrich C, Aifa S, Villalobo A. The role of the calmodulin-binding and calmodulin-like domains of the epidermal growth factor receptor in tyrosine kinase activation. J Cell Physiol 2020; 236:4997-5011. [PMID: 33305427 DOI: 10.1002/jcp.30205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Revised: 11/20/2020] [Accepted: 11/26/2020] [Indexed: 11/11/2022]
Abstract
The epidermal growth factor receptor (EGFR) harbors a calmodulin (CaM)-binding domain (CaM-BD) and a CaM-like domain (CaM-LD) upstream and downstream, respectively, of the tyrosine kinase (TK) domain. We demonstrate in this paper that deletion of the positively charged CaM-BD (EGFR/CaM-BD∆) inactivated the TK activity of the receptor. Moreover, deletion of the negatively charged CaM-LD (EGFR/CaM-LD∆), leaving a single negative residue (glutamate), reduced the activity of the receptor. In contrast, substituting the CaM-LD with a histidine/valine-rich peptide (EGFR/InvCaM-LD) caused full inactivation. We also demonstrated using confocal microscopy and flow cytometry that the chimera EGFR-green fluorescent protein (GFP)/CaM-BD∆, the EGFR/CaM-LD∆, and EGFR/InvCaM-LD mutants all bind tetramethylrhodamine-labelled EGF. These EGFR mutants were localized at the plasma membrane as the wild-type receptor does. However, only the EGFR/CaM-LD∆ and EGFR/InvCaM-LD mutants appear to undergo ligand-dependent internalization, while the EGFR-GFP/CaM-BD∆ mutant seems to be deficient in this regard. The obtained results and in silico modelling studies of the asymmetric structure of the EGFR kinase dimer support a role of a CaM-BD/CaM-LD electrostatic interaction in the allosteric activation of the EGFR TK.
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Affiliation(s)
- Faten Abdelli
- Centre of Biotechnology of Sfax, Sfax, Tunisia.,Instituto de Investigaciones Biomédicas, Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid, Madrid, Spain
| | - Karim Jellali
- Centre of Biotechnology of Sfax, Sfax, Tunisia.,Instituto de Investigaciones Biomédicas, Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid, Madrid, Spain
| | - Estefanía Anguita
- Instituto de Investigaciones Biomédicas, Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid, Madrid, Spain.,Molecular Biology and Biochemistry Research Center, CIBBIM-Nanomedicine, Vall d'Hebron Hospital Research Institute, Barcelona, Spain
| | - María González-Muñoz
- Instituto de Investigaciones Biomédicas, Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid, Madrid, Spain
| | - Eduardo Villalobo
- Departamento de Microbiología, Facultad de Biología, Universidad de Sevilla, Sevilla, Spain
| | - Ivan Madroñal
- Instituto de Investigaciones Biomédicas, Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid, Madrid, Spain
| | - Juan Alcalde
- Instituto de Investigaciones Biomédicas, Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid, Madrid, Spain
| | | | - Jihene Elloumi-Mseddi
- Centre of Biotechnology of Sfax, Sfax, Tunisia.,Instituto de Investigaciones Biomédicas, Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid, Madrid, Spain
| | - Ikram Jemel
- Centre of Biotechnology of Sfax, Sfax, Tunisia.,Instituto de Investigaciones Biomédicas, Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid, Madrid, Spain
| | - Francesc Tebar
- Unitat de Biologia Cel·lular, Departament de Biomedicina, Facultat de Medicina i Ciències de la Salut, Centre de Recerca Biomèdica CELLEX, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Universitat de Barcelona, Barcelona, Spain
| | - Carlos Enrich
- Unitat de Biologia Cel·lular, Departament de Biomedicina, Facultat de Medicina i Ciències de la Salut, Centre de Recerca Biomèdica CELLEX, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Universitat de Barcelona, Barcelona, Spain
| | - Sami Aifa
- Centre of Biotechnology of Sfax, Sfax, Tunisia
| | - Antonio Villalobo
- Instituto de Investigaciones Biomédicas, Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid, Madrid, Spain.,Cancer and Human Molecular Genetics Area-Oto-Neurosurgery Research Group, University Hospital La Paz Research Institute (IdiPAZ), Madrid, Spain
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Akremi I, Holtappels D, Brabra W, Jlidi M, Hadj Ibrahim A, Ben Ali M, Fortuna K, Ahmed M, Meerbeek BV, Rhouma A, Lavigne R, Ben Ali M, Wagemans J. First Report of Filamentous Phages Isolated from Tunisian Orchards to Control Erwinia amylovora. Microorganisms 2020; 8:microorganisms8111762. [PMID: 33182526 PMCID: PMC7697814 DOI: 10.3390/microorganisms8111762] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2020] [Revised: 10/20/2020] [Accepted: 10/22/2020] [Indexed: 01/28/2023] Open
Abstract
Newly discovered Erwinia amylovora phages PEar1, PEar2, PEar4 and PEar6 were isolated from three different orchards in North Tunisia to study their potential as biocontrol agents. Illumina sequencing revealed that the PEar viruses carry a single-strand DNA genome between 6608 and 6801 nucleotides and belong to the Inoviridae, making them the first described filamentous phages of E. amylovora. Interestingly, phage-infected cells show a decreased swimming and swarming motility and a cocktail of the four phages can significantly reduce infection of E. amylovora in a pear bioassay, potentially making them suitable candidates for phage biocontrol.
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Affiliation(s)
- Ismahen Akremi
- Laboratory of Microbial Biotechnology, Enzymatics and Biomolecules (LBMEB), Center of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour km 6, P.O. Box 1177, Sfax 3018, Tunisia; (I.A.); (W.B.); (M.J.); (A.H.I.); (M.B.A.); (M.B.A.)
- Laboratory of Gene Technology, Department of Biosystems, KU Leuven, Kasteelpark Arenberg 21-Box 2462, 3001 Leuven, Belgium; (D.H.); (K.F.); (R.L.)
| | - Dominique Holtappels
- Laboratory of Gene Technology, Department of Biosystems, KU Leuven, Kasteelpark Arenberg 21-Box 2462, 3001 Leuven, Belgium; (D.H.); (K.F.); (R.L.)
| | - Wided Brabra
- Laboratory of Microbial Biotechnology, Enzymatics and Biomolecules (LBMEB), Center of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour km 6, P.O. Box 1177, Sfax 3018, Tunisia; (I.A.); (W.B.); (M.J.); (A.H.I.); (M.B.A.); (M.B.A.)
- Astrum Biotech, Business Incubator, Center of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour km 6, P.O. Box 1177, Sfax 3018, Tunisia
| | - Mouna Jlidi
- Laboratory of Microbial Biotechnology, Enzymatics and Biomolecules (LBMEB), Center of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour km 6, P.O. Box 1177, Sfax 3018, Tunisia; (I.A.); (W.B.); (M.J.); (A.H.I.); (M.B.A.); (M.B.A.)
| | - Adel Hadj Ibrahim
- Laboratory of Microbial Biotechnology, Enzymatics and Biomolecules (LBMEB), Center of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour km 6, P.O. Box 1177, Sfax 3018, Tunisia; (I.A.); (W.B.); (M.J.); (A.H.I.); (M.B.A.); (M.B.A.)
| | - Manel Ben Ali
- Laboratory of Microbial Biotechnology, Enzymatics and Biomolecules (LBMEB), Center of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour km 6, P.O. Box 1177, Sfax 3018, Tunisia; (I.A.); (W.B.); (M.J.); (A.H.I.); (M.B.A.); (M.B.A.)
- Astrum Biotech, Business Incubator, Center of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour km 6, P.O. Box 1177, Sfax 3018, Tunisia
| | - Kiandro Fortuna
- Laboratory of Gene Technology, Department of Biosystems, KU Leuven, Kasteelpark Arenberg 21-Box 2462, 3001 Leuven, Belgium; (D.H.); (K.F.); (R.L.)
| | - Mohammed Ahmed
- Biomaterials Research Group (BIOMAT), Department of Oral Sciences, KU Leuven, Kapucijnenvoer 7-Block A Box 7001, 3000 Leuven, Belgium; (M.A.); (B.V.M.)
- Department of Dental Biomaterials, Tanta University, Biomedical Campus, 32511 Tanta, Gharbia Governorate, Egypt
| | - Bart Van Meerbeek
- Biomaterials Research Group (BIOMAT), Department of Oral Sciences, KU Leuven, Kapucijnenvoer 7-Block A Box 7001, 3000 Leuven, Belgium; (M.A.); (B.V.M.)
| | - Ali Rhouma
- Laboratory of Integrated Olive Production, Olive Tree Institute, BP208 Marhajene City, Tunis 1082, Tunisia;
| | - Rob Lavigne
- Laboratory of Gene Technology, Department of Biosystems, KU Leuven, Kasteelpark Arenberg 21-Box 2462, 3001 Leuven, Belgium; (D.H.); (K.F.); (R.L.)
| | - Mamdouh Ben Ali
- Laboratory of Microbial Biotechnology, Enzymatics and Biomolecules (LBMEB), Center of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour km 6, P.O. Box 1177, Sfax 3018, Tunisia; (I.A.); (W.B.); (M.J.); (A.H.I.); (M.B.A.); (M.B.A.)
- Astrum Biotech, Business Incubator, Center of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour km 6, P.O. Box 1177, Sfax 3018, Tunisia
| | - Jeroen Wagemans
- Laboratory of Gene Technology, Department of Biosystems, KU Leuven, Kasteelpark Arenberg 21-Box 2462, 3001 Leuven, Belgium; (D.H.); (K.F.); (R.L.)
- Correspondence: ; Tel.: +32-1637-4622
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Abdmouleh F, El Arbi M, Saad HB, Jellali K, Ketata E, Amara IB, Pigeon P, Hassen HB, Top S, Jaouen G, Hammami R, Ali MB, Gupta GK. Antimicrobial, Antitumor and Side Effects Assessment of a Newly Synthesized Tamoxifen Analog. Curr Top Med Chem 2020; 20:2281-2288. [PMID: 32814527 DOI: 10.2174/1568026620666200819145526] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2020] [Revised: 07/20/2020] [Accepted: 07/20/2020] [Indexed: 11/22/2022]
Abstract
BACKGROUND Tamoxifen citrate is a very prevalent drug marketed under several trade names like Apo-Tamox, Nolvadex, Tamec, Tamizam, and Tamoplex. This molecule is approved by the FDA for breast cancer treatment. Some studies have shown that tamoxifen has anti-tuberculosis and antiparasitic activities. Like any drug, tamoxifen possesses side effects, more or less dangerous. AIMS Basically, this work is a comparative study that aims to: primarily compare the antimicrobial and antitumor activities of tamoxifen and a newly synthesized tamoxifen analog; and to determine the molecule with lesser side effects. METHODS Three groups of mice were injected with tamoxifen citrate and compound 2(1,1-bis[4-(3- dimethylaminopropoxy)phenyl]-2-phenyl-but-1-ene dihydrochloride) at doses corresponding to C1 (1/10), C2 (1/50), and C3 (1/100) to compound 2 lethal dose (LD50 = 75 mg/kg) administered to adult mice. A group of noninjected mice served as a study control. RESULTS Experimental results suggest that compound 2 has better antitumor and antimicrobial activity than tamoxifen citrate besides its lower toxicity effects. CONCLUSION The results obtained from the present study confirmed the antitumor and antimicrobial effect of tamoxifen citrate and its hematological side effects. Compound 2 seems to be more effective than tamoxifen citrate for antitumor and antimicrobial treatment while having less hematological side effects and less disruption of the blood biochemical parameters. These findings encourage us to perform further studies on compound 2 and test it for other therapeutic uses for which tamoxifen was found effective.
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Affiliation(s)
- Fatma Abdmouleh
- Centre of Biotechnology of Sfax, University of Sfax, Route de Sidi Mansour km 6, 3018 Sfax, Tunisia
| | - Mehdi El Arbi
- Centre of Biotechnology of Sfax, University of Sfax, Route de Sidi Mansour km 6, 3018 Sfax, Tunisia,Higher Institute of Biotechnology of Sfax, University of Sfax, Route de Sokra km 4, 3000 Sfax, Tunisia
| | - Hajer Ben Saad
- Faculty of Medicine, University of Sfax, Laboratory of Pharmacology UR/12 ES-13, 3029 Sfax, Tunisia
| | - Karim Jellali
- Centre of Biotechnology of Sfax, University of Sfax, Route de Sidi Mansour km 6, 3018 Sfax, Tunisia
| | - Emna Ketata
- Centre of Biotechnology of Sfax, University of Sfax, Route de Sidi Mansour km 6, 3018 Sfax, Tunisia
| | - Ibtissem Ben Amara
- Higher Institute of Biotechnology of Sfax, University of Sfax, Route de Sokra km 4, 3000 Sfax, Tunisia
| | - Pascal Pigeon
- Sorbonne Université, UMR 8232 CNRS, IPCM, 4 place Jussieu, F-75005 Paris, France,PSL, Chimie ParisTech, 11 rue Pierre et Marie Curie, F-75005 Paris (France)
| | - Hanen Ben Hassen
- Higher Institute of Biotechnology of Sfax, University of Sfax, Route de Sokra km 4, 3000 Sfax, Tunisia
| | - Siden Top
- Sorbonne Université, UMR 8232 CNRS, IPCM, 4 place Jussieu, F-75005 Paris, France
| | - Gérard Jaouen
- Sorbonne Université, UMR 8232 CNRS, IPCM, 4 place Jussieu, F-75005 Paris, France,PSL, Chimie ParisTech, 11 rue Pierre et Marie Curie, F-75005 Paris (France)
| | - Riadh Hammami
- School of Nutrition Sciences, University of Ottawa, Ottawa, K1N 7 K4, ON, Canada
| | - Mamdouh Ben Ali
- Centre of Biotechnology of Sfax, University of Sfax, Route de Sidi Mansour km 6, 3018 Sfax, Tunisia
| | - Girish Kumar Gupta
- Departemt of Pharmaceutical Chemistry, Sri Sai College of Pharmacy, Badhani, Pathankot-145001, Punjab, India
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Ricco C, Abdmouleh F, Riccobono C, Guenineche L, Martin F, Goya-Jorge E, Lagarde N, Liagre B, Ali MB, Ferroud C, Arbi ME, Veitía MSI. Pegylated triarylmethanes: Synthesis, antimicrobial activity, anti-proliferative behavior and in silico studies. Bioorg Chem 2020; 96:103591. [PMID: 32004896 DOI: 10.1016/j.bioorg.2020.103591] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Revised: 01/10/2020] [Accepted: 01/17/2020] [Indexed: 12/13/2022]
Abstract
We describe herein the synthesis, characterization and biological studies of novel PEGylated triarylmethanes. Non-symmetrical and symmetrical triarylmethanes series have been synthesized by Friedel-Crafts hydroxyalkylation or directly from bisacodyl respectively followed by a functionalization with PEG fragments in order to increase bioavailability and biological effectiveness. The antimicrobial activity was investigated against Gram-positive and Gram-negative foodborne pathogens and against Candida albicans, an opportunistic pathogenic yeast. The anti-biocidal activity was also studied using Staphylococcus aureus as a reference bacterium. Almost all PEGylated molecules displayed an antifungal activity comparable with fusidic acid with MIC values ranging from 6.25 to 50 μg/mL. Compounds also revealed a promising antibiofilm activity with biofilm eradication percentages values above 80% for the best molecules (compounds 4d and 7). Compounds 7 and 8b showed a modest antiproliferative activity against human colorectal cancer cell lines HT-29. Finally, in silico molecular docking studies revealed DHFR and DNA gyrase B as potential anti-bacterial targets and in silico predictions of ADME suggested adequate drug-likeness profiles for the synthetized triarylmethanes.
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Affiliation(s)
- Christophe Ricco
- Equipe de Chimie Moléculaire du Laboratoire Génomique, Bioinformatique et Chimie Moléculaire (EA 7528), Conservatoire National des Arts et Métiers (Cnam), 2 Rue Conté, HESAM Université, 75003 Paris, France
| | - Fatma Abdmouleh
- Equipe de Chimie Moléculaire du Laboratoire Génomique, Bioinformatique et Chimie Moléculaire (EA 7528), Conservatoire National des Arts et Métiers (Cnam), 2 Rue Conté, HESAM Université, 75003 Paris, France; Laboratoire de Biotechnologie Microbienne et d'Ingénierie des Enzymes (LBMIE). Centre de Biotechnologie de Sfax, Université de Sfax, Route de Sidi Mansour Km 6, BP 1177, 3018 Sfax, Tunisia
| | - Charlotte Riccobono
- Equipe de Chimie Moléculaire du Laboratoire Génomique, Bioinformatique et Chimie Moléculaire (EA 7528), Conservatoire National des Arts et Métiers (Cnam), 2 Rue Conté, HESAM Université, 75003 Paris, France
| | - Léna Guenineche
- Equipe de Chimie Moléculaire du Laboratoire Génomique, Bioinformatique et Chimie Moléculaire (EA 7528), Conservatoire National des Arts et Métiers (Cnam), 2 Rue Conté, HESAM Université, 75003 Paris, France
| | - Frédérique Martin
- Laboratoire PEIRENE, EA 7500, Département de Biochimie et de Biologie Moléculaire. Faculté de Pharmacie, Université de Limoges, 2, Rue du Dr Marcland, 87025 Limoges, CEDEX, France
| | - Elizabeth Goya-Jorge
- ProtoQSAR SL. CEEI (Centro Europeo de Empresas Innovadoras), Parque Tecnológico de Valencia, Av. Benjamin Franklin 12, 46980 Paterna, Valencia, Spain
| | - Nathalie Lagarde
- Equipe de Chimie Moléculaire du Laboratoire Génomique, Bioinformatique et Chimie Moléculaire (EA 7528), Conservatoire National des Arts et Métiers (Cnam), 2 Rue Conté, HESAM Université, 75003 Paris, France
| | - Bertrand Liagre
- Laboratoire PEIRENE, EA 7500, Département de Biochimie et de Biologie Moléculaire. Faculté de Pharmacie, Université de Limoges, 2, Rue du Dr Marcland, 87025 Limoges, CEDEX, France
| | - Mamdouh Ben Ali
- Laboratoire de Biotechnologie Microbienne et d'Ingénierie des Enzymes (LBMIE). Centre de Biotechnologie de Sfax, Université de Sfax, Route de Sidi Mansour Km 6, BP 1177, 3018 Sfax, Tunisia
| | - Clotilde Ferroud
- Equipe de Chimie Moléculaire du Laboratoire Génomique, Bioinformatique et Chimie Moléculaire (EA 7528), Conservatoire National des Arts et Métiers (Cnam), 2 Rue Conté, HESAM Université, 75003 Paris, France
| | - Mehdi El Arbi
- Laboratoire de Biotechnologie Microbienne et d'Ingénierie des Enzymes (LBMIE). Centre de Biotechnologie de Sfax, Université de Sfax, Route de Sidi Mansour Km 6, BP 1177, 3018 Sfax, Tunisia
| | - Maité Sylla-Iyarreta Veitía
- Equipe de Chimie Moléculaire du Laboratoire Génomique, Bioinformatique et Chimie Moléculaire (EA 7528), Conservatoire National des Arts et Métiers (Cnam), 2 Rue Conté, HESAM Université, 75003 Paris, France.
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Daoud L, Jlidi M, Hmani H, Hadj Brahim A, El Arbi M, Ben Ali M. Characterization of thermo-solvent stable protease fromHalobacillussp. CJ4 isolated from Chott Eldjerid hypersaline lake in Tunisia. J Basic Microbiol 2016; 57:104-113. [DOI: 10.1002/jobm.201600391] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Accepted: 09/22/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Lobna Daoud
- University of Sfax, Centre of Biotechnology of Sfax (CBS); Laboratory of Microbial Biotechnology, Engineering Enzymes LMBEE; Sfax Tunisia
| | - Mouna Jlidi
- University of Sfax, Centre of Biotechnology of Sfax (CBS); Laboratory of Microbial Biotechnology, Engineering Enzymes LMBEE; Sfax Tunisia
| | - Houda Hmani
- University of Sfax, Centre of Biotechnology of Sfax (CBS); Laboratory of Microbial Biotechnology, Engineering Enzymes LMBEE; Sfax Tunisia
| | - Adel Hadj Brahim
- University of Sfax, Centre of Biotechnology of Sfax (CBS); Laboratory of Microbial Biotechnology, Engineering Enzymes LMBEE; Sfax Tunisia
| | - Mahdi El Arbi
- University of Sfax, Centre of Biotechnology of Sfax (CBS); Laboratory of Microbial Biotechnology, Engineering Enzymes LMBEE; Sfax Tunisia
| | - Mamdouh Ben Ali
- University of Sfax, Centre of Biotechnology of Sfax (CBS); Laboratory of Microbial Biotechnology, Engineering Enzymes LMBEE; Sfax Tunisia
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Zghal RZ, Elleuch J, Ben Ali M, Darriet F, Rebaï A, Chandre F, Jaoua S, Tounsi S. Towards novel Cry toxins with enhanced toxicity/broader: a new chimeric Cry4Ba / Cry1Ac toxin. Appl Microbiol Biotechnol 2016; 101:113-122. [PMID: 27538933 DOI: 10.1007/s00253-016-7766-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Accepted: 07/20/2016] [Indexed: 10/21/2022]
Abstract
Attempts have been made to express or to merge different Cry proteins in order to enhance toxic effects against various insects. Cry1A proteins of Bacillus thuringiensis form a typical bipyramidal parasporal crystal and their protoxins contain a highly conserved C-terminal region. A chimerical gene, called cry(4Ba-1Ac), formed by a fusion of the N-terminus part of cry4Ba and the C-terminus part of cry1Ac, was constructed. Its transformation to an acrystalliferous B. thuringiensis strain showed that it was expressed as a chimerical protein of 116 kDa, assembled in spherical to amorphous parasporal crystals. The chimerical gene cry(4Ba-1Ac) was introduced in a B. thuringiensis kurstaki strain. In the generated crystals of the recombinant strain, the presence of Cry(4Ba-1Ac) was evidenced by MALDI-TOF. The recombinant strain showed an important increase of the toxicity against Culex pipiens larvae (LC50 = 0.84 mg l-1 ± 0.08) compared to the wild type strain through the synergistic activity of Cry2Aa with Cry(4Ba-1Ac). The enhancement of toxicity of B. thuringiensis kurstaki expressing Cry(4Ba-1Ac) compared to that expressing the native toxin Cry4Ba, might be related to its a typical crystallization properties. The developed fusion protein could serve as a potent toxin against different pests of mosquitoes and major crop plants.
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Affiliation(s)
- Raida Zribi Zghal
- Laboratory of Biopesticides, Centre of Biotechnology of Sfax, University of Sfax, P.O. Box "1177", 3018, Sfax, Tunisia.
| | - Jihen Elleuch
- Laboratory of Biopesticides, Centre of Biotechnology of Sfax, University of Sfax, P.O. Box "1177", 3018, Sfax, Tunisia
| | - Mamdouh Ben Ali
- Laboratoire de Microorganismes et de Biomolécules, Centre de Biotechnologie de Sfax, Université de Sfax, Sfax, Tunisia
| | - Frédéric Darriet
- Institut de Recherche pour le Développement (IRD), UMR MIVEGEC (UM1-UM2-CNRS 5290-IRD 224) Maladies Infectieuses et Vecteurs, Ecologie, Génétique, Evolution et Contrôle, Laboratoire de Lutte contre les Insectes Nuisibles (LIN), Montpellier, France
| | - Ahmed Rebaï
- Research Group on Molecular and Cellular Screening Processes, Laboratory of Microorganisms and Biomolecules, Centre of Biotechnology of Sfax, Sfax, Tunisia
| | - Fabrice Chandre
- Institut de Recherche pour le Développement (IRD), UMR MIVEGEC (UM1-UM2-CNRS 5290-IRD 224) Maladies Infectieuses et Vecteurs, Ecologie, Génétique, Evolution et Contrôle, Laboratoire de Lutte contre les Insectes Nuisibles (LIN), Montpellier, France
| | - Samir Jaoua
- Biological & Environmental Sciences Department, College of Arts and Sciences, Qatar University, P.O. Box: 2713, Doha, Qatar
| | - Slim Tounsi
- Laboratory of Biopesticides, Centre of Biotechnology of Sfax, University of Sfax, P.O. Box "1177", 3018, Sfax, Tunisia
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Ali MB, Attia M. Development and Validation of a RP-HPLC Method for Simultaneous Determination of Betamethasone and Sodium Benzoate in Oral Liquid Pharmaceutical Formulation. Indian J Pharm Sci 2016. [DOI: 10.4172/pharmaceutical-sciences.1000131] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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Ammar A, Chtourou H, Hammouda O, Trabelsi K, Chiboub J, Turki M, AbdelKarim O, El Abed K, Ben Ali M, Hoekelmann A, Souissi N. Acute and delayed responses of C-reactive protein, malondialdehyde and antioxidant markers after resistance training session in elite weightlifters: Effect of time of day. Chronobiol Int 2015; 32:1211-22. [DOI: 10.3109/07420528.2015.1079215] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Farhat-Khemakhem A, Ali MB, Boukhris I, Khemakhem B, Maguin E, Bejar S, Chouayekh H. Crucial role of Pro 257 in the thermostability of Bacillus phytases: biochemical and structural investigation. Int J Biol Macromol 2012. [PMID: 23178368 DOI: 10.1016/j.ijbiomac.2012.11.020] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
We have previously cloned and characterized the thermostable phytase (PHY US417) from Bacillus subtilis US417. It differs with PhyC from B. subtilis VTTE-68013 by the R257P substitution. PHY US417 was shown to be more thermostable than PhyC. To elucidate the mechanism of how the Pro 257 changes the thermostability of Bacillus phytases, this residue was mutated to Arg and Ala. The experimental results revealed that the thermostability of the P257A mutants and especially P257R was significantly decreased. The P257R and P257A mutants recovered, respectively, 64.4 and 81.5% of the wild-type activity after incubation at 75 °C for 30 min in the presence of 5mM CaCl(2). The P257R mutation also led to a severe reduction in the specific activity and catalytic efficiency of the enzyme. Structural investigation, by molecular modeling of PHY US417 and PhyC focused on the region of the 257 residue, revealed that this residue was present in a surface loop connecting two of the six characteristic β sheets. The P257 residue is presumed to reduce the local thermal flexibility of the loop, thus generating a higher thermostability.
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Affiliation(s)
- Ameny Farhat-Khemakhem
- Laboratoire de Microorganismes et de Biomolécules, Centre de Biotechnologie de Sfax, Université de Sfax, Route de Sidi Mansour Km 6, BP 1177 3018 Sfax, Tunisia
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Ben Hlima H, Aghajari N, Ben Ali M, Haser R, Bejar S. Engineered glucose isomerase from Streptomyces sp. SK is resistant to Ca2+ inhibition and Co2+ independent. ACTA ACUST UNITED AC 2012; 39:537-46. [DOI: 10.1007/s10295-011-1061-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2011] [Accepted: 11/08/2011] [Indexed: 11/24/2022]
Abstract
Abstract
The role of two amino acid residues linked to the two catalytic histidines His54 and His220 in kinetics and physicochemical properties of the Streptomyces sp. SK glucose isomerase (SKGI) was investigated by site-directed mutagenesis and molecular modeling. Two single mutations, F53L and G219D, and a double mutation F53L/G219D was introduced into the xylA SKGI gene. The F53L mutation increases the thermostability and the catalytic efficiency and also slightly shifts the optimum pH from 6.5 to 7, but displays a profile being similar to that of the wild-type enzyme concerning the effect of various metal ions. The G219D mutant is resistant to calcium inhibition retaining about 80% of its residual activity in 10 mM Ca2+ instead of 10% for the wild-type. This variant is activated by Mn2+ ions, but not Co2+, as seen for the wild-type enzyme. It does not require the latter for its thermostability, but has its half-life time displaced from 50 to 20 min at 85°C. The double mutation F53L/G219D restores the thermostability as seen for the wild-type enzyme while maintaining the resistance to the calcium inhibition. Molecular modeling suggests that the increase in thermostability is due to new hydrophobic interactions stabilizing α2 helix and that the resistance to calcium inhibition is a result of narrowing the binding site of catalytic ion.
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Affiliation(s)
- Hajer Ben Hlima
- grid.412124.0 0000000123235644 Laboratoire de Microorganismes et de Biomolécules, Centre de Biotechnologie de Sfax Université de Sfax B.P 1177 Route de Sidi Mansour Km 6 3018 Sfax Tunisia
| | - Nushin Aghajari
- grid.25697.3f 0000 0001 2172 4233 Laboratoire de BioCristallographie et Biologie Structurale des Cibles Thérapeutiques, Bases Moléculaires et Structurales des Systèmes Infectieux UMR 5086–CNRS/Université Lyon 1, Institut de Biologie et Chimie des Protéines FR3302, 7 Passage du Vercors 69367 Lyon cedex 07 France
| | - Mamdouh Ben Ali
- grid.412124.0 0000000123235644 Laboratoire de Microorganismes et de Biomolécules, Centre de Biotechnologie de Sfax Université de Sfax B.P 1177 Route de Sidi Mansour Km 6 3018 Sfax Tunisia
| | - Richard Haser
- grid.25697.3f 0000 0001 2172 4233 Laboratoire de BioCristallographie et Biologie Structurale des Cibles Thérapeutiques, Bases Moléculaires et Structurales des Systèmes Infectieux UMR 5086–CNRS/Université Lyon 1, Institut de Biologie et Chimie des Protéines FR3302, 7 Passage du Vercors 69367 Lyon cedex 07 France
| | - Samir Bejar
- grid.412124.0 0000000123235644 Laboratoire de Microorganismes et de Biomolécules, Centre de Biotechnologie de Sfax Université de Sfax B.P 1177 Route de Sidi Mansour Km 6 3018 Sfax Tunisia
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Ben Ali M, Ghram M, Hmani H, Khemakhem B, Haser R, Bejar S. Toward the smallest active subdomain of a TIM-barrel fold: insights from a truncated α-amylase. Biochem Biophys Res Commun 2011; 411:265-70. [PMID: 21741359 DOI: 10.1016/j.bbrc.2011.06.114] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2011] [Accepted: 06/17/2011] [Indexed: 11/19/2022]
Abstract
AmyTM is a truncated mutant of the α-amylase of Bacillus stearothermophilus US100. It has been derived from the wild type amylase gene via a reading frame shift, following a tandem duplication of the mutant primer, associated to an Adenine base deletion. AmyTM was composed of 720 nucleotides encoding 240 amino acid residues out of 549 of the wild type. The AmyTM protein was devoided of the three catalytic residues but still retains catalytic activity. It is Ca-independent maltotetraose producing amylase, optimally active at pH 6 and 60°C, under monomeric or multimeric forms. AmyTM is the smallest functional truncated TIM barrel. It contains the βαβα unit as the minimal subdomain associated to an enzymatic function. The enzymatic activity can, until now, be attributed to the presence of the whole domain B, in the structure of AmyTM. This mutant revealed, for the first time, the regeneration of a catalytic site after its abolition. This fact may be considered as the restoration of a primitive active site, which was lost in the course of evolution toward more stable domains.
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Affiliation(s)
- Mamdouh Ben Ali
- Laboratoire de Métabolites et de Biomolécules, Centre de Biotechnologie de Sfax, Université de Sfax, B.P. 1177, 3018 Sfax, Tunisia.
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Ben Mabrouk S, Aghajari N, Ben Ali M, Ben Messaoud E, Juy M, Haser R, Bejar S. Enhancement of the thermostability of the maltogenic amylase MAUS149 by Gly312Ala and Lys436Arg substitutions. Bioresour Technol 2011; 102:1740-1746. [PMID: 20855205 DOI: 10.1016/j.biortech.2010.08.082] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2010] [Revised: 08/23/2010] [Accepted: 08/23/2010] [Indexed: 05/29/2023]
Abstract
Based on sequence alignments and homology modeling, Gly 312 and Lys 436 of the maltogenic amylase from Bacillus sp. US149 (MAUS149) were selected as targets for site-directed mutagenesis to improve the thermostability of the enzyme. Variants of MAUS149 with amino acid substitutions G312A, K436R and G312A-K436R had substrate specificities, kinetic parameters and pH optima similar to those of the wild-type enzyme; however, the enzymes with substitutions K436R and G312A-K436R, had an optimal temperature of 45 °C instead of the 40 °C for the wild-type enzyme. The half-life time at 55 °C increased from 15 to 25 min for the double mutant. Molecular modeling suggests that the increase in thermostability was due to new hydrophobic interactions and the formation of a salt bridge and hydrogen bond in the G312A and K436R variants, respectively. The double mutant could be a potential candidate for application in the bread industry.
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Affiliation(s)
- Sameh Ben Mabrouk
- Laboratoire de Microorganismes et de Biomolécules, Centre de Biotechnologie de Sfax, BP 1177, Sfax 3018, Tunisia
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Halim NDA, Ali MB, Junaidi J, Yahaya N. Learning acids and bases through inquiry based website. 2010 IEEE Conference on Open Systems (ICOS 2010) 2010. [DOI: 10.1109/icos.2010.5720063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
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Ben Abdelmalek I, Urdaci MC, Ben Ali M, Denayrolles M, Chaignepain S, Limam F, Bejar S, Marzouki MN. Structural investigation and homology modeling studies of native and truncated forms of alpha-amylases from Sclerotinia sclerotiorum. J Microbiol Biotechnol 2010; 19:1306-18. [PMID: 19996681 DOI: 10.4014/jmb.0903.3013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
The filamentous ascomycete Sclerotinia sclerotiorum is well known for its ability to produce a large variety of hydrolytic enzymes for the degradation of plant polysaccharide material. Two alpha-amylases designated as ScAmy54 and ScAmy43 were biochemically characterized and predicted to play an important role in starch degradation. Those enzymes produce specific oligosaccharides, essentially maltotriose, that have a considerable commercial interest. The primary structures of the two enzymes were analyzed by N-terminal sequencing, MALDI-TOF mass spectrometry, and cDNA cloning, and implied that the two proteins have the same N-terminal catalytic domain and ScAmy43 was produced from ScAmy54 by truncation of 96 amino acids at the carboxyl-terminal region. The result of genomic analysis suggested that the two enzymes originated from the same alpha-amylase gene and that truncation of ScAmy54 to ScAmy43 occurred probably during the S. sclerotiorum cultivation. The structural gene of ScAmy54 consisted of 9 exons and 8 introns, containing a single 1,500-bp open reading frame encoding 499 amino acids including a signal peptide of 21 amino acids. ScAmy54 exhibited high amino acid identity to other liquefying fungal alpha-amylases, essentially in the four conserved regions and in the putative catalytic triad. A 3D structure model of ScAmy54 and ScAmy43 was built using the 3D structure of 2guy from A. niger as template. ScAmy54 with three domains A, B, and C, including the well-known (beta/alpha)8-barrel motif in domain A, has a typical structure of the alpha-amylase family. ScAmy43 composed only of domains A and B constitutes a smallest fungal alpha-amylase with only a catalytic domain.
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Affiliation(s)
- Imen Ben Abdelmalek
- Institut National des Sciences Appliquées et de Technologie, Centre Urbain Nord 676-1080 Tunis Cedex, Tunisia
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Skouri-Gargouri H, Ben Ali M, Gargouri A. Molecular cloning, structural analysis and modelling of the AcAFP antifungal peptide from Aspergillus clavatus. Peptides 2009; 30:1798-804. [PMID: 19591888 DOI: 10.1016/j.peptides.2009.06.034] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2009] [Revised: 06/25/2009] [Accepted: 06/26/2009] [Indexed: 11/17/2022]
Abstract
An abundantly secreted thermostable peptide (designed AcAFP) with a molecular mass of 5777 Da was isolated and purified in a previous work from a local strain of A. clavatus (VR1). Based on the N-terminal amino acid (aa) sequence of the AcAFP peptide, an oligonucleotide probe was derived and allowed the amplification of the encoding cDNA by RT-PCR. This cDNA fragment encodes a pre-pro-protein of 94 aa which appears to be processed to a mature product of 51 aa cys-rich protein. The deduced aa sequence of the pre-pro-sequence reveals high similarity with ascomycetes antifungal peptide. Comparison of the nucleotide sequence of the genomic fragment and the cDNA clone revealed the presence of an open reading frame of 282 bp interrupted by two small introns of 89 and 56 bp with conserved splice site. The three-dimensional (3D) structure modeling of AcAFP exhibits a compact structure consisting of five anti-parallel beta barrel stabilized by four internal disulfide bridges. The folding pattern revealed also a cationic site and spatially adjacent hydrophobic stretch. The antifungal mechanism was investigated by transmission and confocal microscopy. AcAFP cause cell wall altering in a dose-dependent manner against the phytopathogenic fungus Fusarium oxysporum.
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Affiliation(s)
- Houda Skouri-Gargouri
- Laboratoire de Génétique Moléculaire des Eucaryotes, Centre de Biotechnologie de Sfax, Route Sidi Mansour, BP K 3038-Sfax, Tunisia
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Jaouadi B, Ellouz-Chaabouni S, Ali MB, Messaoud EB, Naili B, Dhouib A, Bejar S. Excellent laundry detergent compatibility and high dehairing ability of the Bacillus pumilus CBS alkaline proteinase (SAPB). BIOTECHNOL BIOPROC E 2009. [DOI: 10.1007/s12257-008-0244-8] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Khemakhem B, Ali MB, Aghajari N, Juy M, Haser R, Bejar S. The importance of an extra loop in the B-domain of an α-amylase from B. stearothermophilus US100. Biochem Biophys Res Commun 2009; 385:78-83. [DOI: 10.1016/j.bbrc.2009.04.137] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2009] [Accepted: 04/26/2009] [Indexed: 11/29/2022]
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Khemakhem B, Ali MB, Aghajari N, Juy M, Haser R, Bejar S. Engineering of the α-amylase fromGeobacillus stearothermophilusUS100 for detergent incorporation. Biotechnol Bioeng 2009; 102:380-9. [DOI: 10.1002/bit.22083] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Affiliation(s)
- A H Mohamed
- Medicinal and Aromatic Plant Research Institute, P.O. Box 2404, Khartoum, Sudan
| | - M B Ali
- Medicinal and Aromatic Plant Research Institute, P.O. Box 2404, Khartoum, Sudan
| | - A K Bashir
- Medicinal and Aromatic Plant Research Institute, P.O. Box 2404, Khartoum, Sudan
| | - A M Salih
- Medicinal and Aromatic Plant Research Institute, P.O. Box 2404, Khartoum, Sudan
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Trigui-Lahiani HÃ, Ayadi M, Hadj-Taïeb N, Ali MB, Gargouri A. Genomic organization of a polygalacturonase gene from a hyperpectinolytic mutant strain of Penicillium occitanis. FEMS Microbiol Lett 2008; 281:23-9. [DOI: 10.1111/j.1574-6968.2008.01071.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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Zouari Ayadi D, Ben Ali M, Jemli S, Ben Mabrouk S, Mezghani M, Ben Messaoud E, Bejar S. Heterologous expression, secretion and characterization of the Geobacillus thermoleovorans US105 type I pullulanase. Appl Microbiol Biotechnol 2008; 78:473-81. [PMID: 18183386 DOI: 10.1007/s00253-007-1318-9] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2007] [Revised: 12/04/2007] [Accepted: 12/04/2007] [Indexed: 11/24/2022]
Abstract
Pullulanase type I of Geobacillus thermoleovorans US105 strain (PUL US105) was produced and secreted efficiently in the E. coli periplasmic or extracellular fraction using two different signal peptides. Hence, the open reading frame was connected downstream of the lipase A signal peptide of Bacillus subtilis strain leading to an efficient secretion of an active form enzyme on the periplasmic fraction. In addition, pul US105 was fused to the alpha-amylase signal sequence of the Bacillus stearothermophilus US100 strain. The monitoring of the pullulanase activity and Western blot analysis for this last construction showed that the most activity was found in the supernatant culture, proving the efficient secretion of this natively cytoplasmic enzyme as an active form. The PUL US105 was purified to homogeneity from the periplasmic fraction, using heat treatment, size exclusion, and anion-exchange chromatography. The native pullulanase has a molecular mass of 160 kDa and is composed of two identical subunits of 80 kDa each. It was independent for metallic ions for its activity, while its thermostability was obviously improved in presence of only 0.1 mM CaCl2.
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Affiliation(s)
- Dorra Zouari Ayadi
- Laboratory of Enzymes and Metabolites of Prokaryotes, Centre of Biotechnology of Sfax, BP K, 3038, Sfax, Tunisia
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Ben Ali M, Khemakhem B, Robert X, Haser R, Bejar S. Thermostability enhancement and change in starch hydrolysis profile of the maltohexaose-forming amylase of Bacillus stearothermophilus US100 strain. Biochem J 2006; 394:51-6. [PMID: 16197365 PMCID: PMC1386002 DOI: 10.1042/bj20050726] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The implications of Asn315 and Val450 in the atypical starch hydrolysis profile of Bacillus stearothermophilus Amy (a-amylase) US100 have been suggested previously [Ben Ali, Mhiri, Mezghani and Bejar (2001) Enzyme Microb. Tech. 28, 537-542]. In order to confirm this hypothesis, three mutants were generated. Of these two have a single mutation, N315D or V450G, whereas the third contains both mutations. Analysis of the starch breakdown-profile of these three mutants, as well as of the wild-type, allowed us to conclude that each single mutation induces a small variation in the hydrolysis product. However, the major end product produced by the double mutant shifts from maltopentaose/maltohexaose to maltose/maltotriose, confirming the involvement of these two residues in starch hydrolysis. The superimposition of AmyUS100 model with that of Bacillus licheniformis shows in AmyUS100 an additional loop containing residues Ile214 and Gly215. Remarkably, the deletion of these two residues increases the half-life at 100 degrees C from 15 min to approx. 70 min. Moreover, this engineered amylase requires less calcium, 25 p.p.m. instead of 100 p.p.m., to reach maximal thermostability.
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Affiliation(s)
- Mamdouh Ben Ali
- *Centre de Biotechnologie de Sfax, BP ‘K’ 3038 Sfax, Tunisia
| | | | - Xavier Robert
- †Laboratoire de BioCristallographie, Institut de Biologie et Chimie des Protéines, UMR 5086-CNRS/Université de Lyon I, IFR128 ‘BioSciences Lyon-Gerland’, 7 Passage du Vercors, F-69367 Lyon Cedex 07, France
| | - Richard Haser
- †Laboratoire de BioCristallographie, Institut de Biologie et Chimie des Protéines, UMR 5086-CNRS/Université de Lyon I, IFR128 ‘BioSciences Lyon-Gerland’, 7 Passage du Vercors, F-69367 Lyon Cedex 07, France
| | - Samir Bejar
- *Centre de Biotechnologie de Sfax, BP ‘K’ 3038 Sfax, Tunisia
- To whom correspondence should be addressed (email )
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Abstract
We studied the effects of hyperhydricity on subcellular ultrastructure and physiology of leaves during in vitro regeneration of apple plants. Morphological, anatomical and ultrastructural differences between healthy leaf tissues obtained from greenhouse-grown plants and healthy and hyperhydric leaves obtained from shoots raised from nodal shoot explants in a bioreactor were investigated by electron microscopy and confocal laser scanning microscopy. Compared with healthy leaves, hyperhydric leaves showed abnormal, often discontinuous development of the epidermis and cuticle. Stomata were malformed. The leaf lamina appeared thickened and was characterized by poor differentiation between the palisade and spongy mesophyll tissue. Hyperhydric leaves had a significantly lower chloroplast number per cell and chloroplasts showed reduced thylakoid stacking compared with healthy leaves. Hyperhydricity resulted in a general decrease in concentrations of reduced and oxidized pyridine nucleotides, reflecting a reduction in metabolic activity. The activities of antioxidant enzymes, such as superoxide dismutase, catalase, ascorbate peroxidase and glutathione reductase were higher in hyperhydric leaves than in healthy leaves, indicating that hyperhydricity was associated with oxidative stress. Chlorophyll fluorescence measurements provided evidence of oxidative damage to the photosynthetic machinery in hyperhydric leaves: photochemical efficiency of photosystem II, effective quantum efficiency and photochemical quenching were all lower in hyperhydric leaves compared with healthy leaves.
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Affiliation(s)
- D Chakrabarty
- Research Center for the Development of Advanced Horticultural Technology, Chungbuk National University, Cheong Ju, Republic of Korea
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26
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Vajpayee P, Rai UN, Ali MB, Tripathi RD, Kumar A, Singh SN. Possible involvement of oxidative stress in copper induced inhibition of nitrate reductase activity in Vallisneria spiralis L. Bull Environ Contam Toxicol 2005; 74:745-54. [PMID: 16094890 DOI: 10.1007/s00128-005-0645-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Affiliation(s)
- P Vajpayee
- Ecotoxicology and Bioremediation Laboratory, National Botanical Research Institute, Rana Pratap Marg, Lucknow 226 001, India
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27
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Borgi MA, Srih-Belguith K, Ben Ali M, Mezghani M, Tranier S, Haser R, Bejar S. Glucose isomerase of the Streptomyces sp. SK strain: purification, sequence analysis and implication of alanine 103 residue in the enzyme thermostability and acidotolerance. Biochimie 2004; 86:561-8. [PMID: 15388233 DOI: 10.1016/j.biochi.2004.07.003] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2004] [Accepted: 07/08/2004] [Indexed: 11/29/2022]
Abstract
The glucose isomerase gene (xylA) from the Streptomyces sp. SK strain encodes a 386-amino-acid protein (42.7 kDa) showing extensive identities with many other bacterial glucose isomerases. We have shown by gel filtration chromatography and SDS-PAGE analysis that the purified recombinant glucose isomerase (SKGI) is a 180 kDa tetramer of four 43 kDa subunits. Sequence inspection revealed that this protein, present some special characteristics like the abundance of hydrophobic residues and some original amino-acid substitutions, which distinguish SKGI from the other GIs previously reported. The presence of an Ala residue at position 103 in SKGI is especially remarkable, since the same amino-acid was found at the equivalent position in the extremely thermostable GIs from Thermus thermophilus and Thermotoga neapolitana; whereas a Gly was found in the majority of less thermostable GIs from Streptomyces. The Ala103Gly mutation, introduced in SKGI, significantly decreases the half-life time at 90 degrees C from 80 to 50 min and also shifts the optimum pH from 6.5 to 7.5. This confirms the implication of the Ala103 residue on SKGI thermostability and activity at low pH. A homology model of SKGI based on the SOGI (that of Streptomyces olivochromogenes) crystal structure has been constructed in order to understand the mutational effects on a molecular scale. Hence, the Ala103Gly mutation, affecting enzyme properties, is presumed to increase molecular flexibility and to destabilize, in particular at elevated temperature, the 91-109 loop that includes the important catalytic residue, Phe94.
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Affiliation(s)
- Mohamed Ali Borgi
- Laboratoire d'Enzymes et de Métabolites des Procaryotes, Centre de Biotechnologie de Sfax BP K 3038 Sfax, Tunisie
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28
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Tripathi RD, Vajpayee P, Singh N, Rai UN, Kumar A, Ali MB, Kumar B, Yunus M. Efficacy of various amendments for amelioration of fly-ash toxicity: growth performance and metal composition of Cassia siamea Lamk. Chemosphere 2004; 54:1581-1588. [PMID: 14675837 DOI: 10.1016/j.chemosphere.2003.09.043] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Plants of Cassia siamea Lamk were grown in garden soil (control), fly-ash (100%) and fly-ash amended by various ameliorants (cowdung manure, press-mud, garden soil; 1:1, w/w). The plants survived in fly-ash (100%) though their growth was less in comparison to the treatments. Fly-ash+press-mud (1:1, w/w) proved to be the best combination as growth (total biomass, leaf number, photosynthetic area, total chlorophyll and protein) was significantly high in this treatment followed by cowdung manure and garden soil. Leaves and roots accumulated significant amount of Cu, Zn, Ni and and Fe. However, the concentration of all the metals was more in roots than leaves except Ni. Although, fly-ash contains high amount of metals but the metal uptake was more in the plants grown in fly-ash+press-mud mixture. Inspite of high metal availability in fly-ash and press-mud mixture, plant growth was good. This might be attributed to the some metal detoxification mechanism active in this treatment. The present study concluded that C. siamea seems to be a suitable plant for developing a vegetation cover on fly-ash dumps.
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Affiliation(s)
- R D Tripathi
- Ecotoxicology and Bioremediation Group, National Botanical Research Institute, Rana Pratap Marg, P.O. Box 436, Lucknow 226 001, India.
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29
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Ali MB. Treating severe acute respiratory syndrome with hyperimmune globulins. Hong Kong Med J 2003; 9:391-2. [PMID: 14530539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/27/2023] Open
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30
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Singh RP, Tripathi RD, Dabas S, Rizvi SMH, Ali MB, Sinha SK, Gupta DK, Mishra S, Rai UN. Effect of lead on growth and nitrate assimilation of Vigna radiata (L.) Wilczek seedlings in a salt affected environment. Chemosphere 2003; 52:1245-1250. [PMID: 12821005 DOI: 10.1016/s0045-6535(03)00318-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The inhibition of seedling growth and nitrate reductase activity in 5 d old Vigna radiata (L.) Wilczek cv. Pusa Baisakhi in the presence of 1.0 mM lead acetate increased drastically, if NaCl (6 and 12 EC) was also present in the nutrient media along with the metal salt. Correspondingly higher endogenous Na+ levels were accumulated in the roots and leaves of seedlings in presence of the two stresses. On the other hand, the levels of endogenous lead get reduced in presence of NaCl in both the roots and leaves. Roots accumulated more Pb2+ and Na+ than the leaves. The two stresses affect more drastically in the additive or even synergistic manner during the early growth phase of the seedlings.
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Affiliation(s)
- R P Singh
- Department of Biosciences, M.D. University, Rohtak 124001, India
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31
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Tripathi RD, Rai UN, Vajpayee P, Ali MB, Khan E, Gupta DK, Mishra S, Shukla MK, Singh SN. Biochemical responses of Potamogeton pectinatus L. exposed to higher concentrations of zinc. Bull Environ Contam Toxicol 2003; 71:255-262. [PMID: 14560375 DOI: 10.1007/s00128-003-0158-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Affiliation(s)
- R D Tripathi
- Ecotoxicology and Bioremediation Laboratory, National Botanical Research Institute, Rana Pratap Marg Post Box Number 436, Lucknow 226 001, India
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32
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Rai UN, Tripathi RD, Vajpayee P, Pandey N, Ali MB, Gupta DK. Cadmium accumulation and its phytotoxicity in Potamogeton pectinatus L. (Potamogetonaceae). Bull Environ Contam Toxicol 2003; 70:566-575. [PMID: 12592533 DOI: 10.1007/s00128-003-0023-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Affiliation(s)
- U N Rai
- Ecotoxicology and Bioremediation, National Botanical Research Institute, Rana Pratap Marg, P.B. No. 436, Lucknow-226 001, India
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33
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Ali MB, Vajpayee P, Tripathi RD, Rai UN, Singh SN, Singh SP. Phytoremediation of lead, nickel, and copper by Salix acmophylla Boiss.: role of antioxidant enzymes and antioxidant substances. Bull Environ Contam Toxicol 2003; 70:462-469. [PMID: 12592519 DOI: 10.1007/s00128-003-0009-1] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Affiliation(s)
- M B Ali
- Ecotoxicology and Bioremediation Laboratory, National Botanical Research Institute, Lucknow 226 001, India
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34
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Kumar A, Vajpayee P, Ali MB, Tripathi RD, Singh N, Rai UN, Singh SN. Biochemical responses of Cassia siamea Lamk. grown on coal combustion residue (fly-ash). Bull Environ Contam Toxicol 2002; 68:675-683. [PMID: 12068933 DOI: 10.1007/s001280307] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Affiliation(s)
- A Kumar
- Ecotoxicology and Bioremediation, National Botanical Research Institute, Lucknow, India
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35
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Rai UN, Tripathi RD, Vajpayee P, Jha V, Ali MB. Bioaccumulation of toxic metals (Cr, Cd, Pb and Cu) by seeds of Euryale ferox Salisb. (Makhana) W. Chemosphere 2002; 46:267-272. [PMID: 11827284 DOI: 10.1016/s0045-6535(01)00087-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The level of toxic metals Cr, Cd, Pb and Cu was determined in seeds, water and sediments collected from nine closed waterbodies of Darbhanga, north Bihar, used for cultivation of the edible aquatic macrophyte Euryaleferox Salisb. during harvesting season of the crop for two successive years (1996 and 1997). Seeds bioconcentrated appreciable amount of these toxic metals in the order Pb > Cr > Cu > Cd. The increased load of metal pollution due to domestic and municipal discharges threatened the habitats of the plant. The toxic metal contents in seeds were found positively correlated with the ambient concentration of metals in water and sediments. The importance of these findings has been discussed for national water resource economy of the country and human health perspectives.
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Affiliation(s)
- U N Rai
- National Botanical Research Institute, Lucknow, India.
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36
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Vajpayee P, Rai UN, Ali MB, Tripathi RD, Yadav V, Sinha S, Singh SN. Chromium-induced physiologic changes in Vallisneria spiralis L. and its role in phytoremediation of tannery effluent. Bull Environ Contam Toxicol 2001; 67:246-256. [PMID: 11429683 DOI: 10.1007/s001280117] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2000] [Accepted: 04/26/2001] [Indexed: 05/23/2023]
Affiliation(s)
- P Vajpayee
- Ecotoxicology and Bioremediation, National Botanical Research Institute, Lucknow 226 001, India
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37
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Ali MB, Vajpayee P, Tripathi RD, Rai UN, Kumar A, Singh N, Behl HM, Singh SP. Mercury bioaccumulation induces oxidative stress and toxicity to submerged macrophyte Potamogeton crispus L. Bull Environ Contam Toxicol 2000; 65:573-582. [PMID: 11014840 DOI: 10.1007/s0012800162] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Affiliation(s)
- M B Ali
- Ecotoxicology and Bioremediation Group, National Botanical Research Institute, Lucknow 226 001, India
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38
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Vajpayee P, Tripathi RD, Rai UN, Ali MB, Singh SN. Chromium (VI) accumulation reduces chlorophyll biosynthesis, nitrate reductase activity and protein content in Nymphaea alba L. Chemosphere 2000; 41:1075-1082. [PMID: 10879826 DOI: 10.1016/s0045-6535(99)00426-9] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Plants of Nymphaea alba L. grown at various levels of chromium (VI) ranging from 1 to 200 microM accumulated chromium in concentration and duration-dependent manner. At all Cr levels, chromium accumulation by various plant tissues followed the order roots > leaves > rhizomes. Approximately 93% of total chromium present in the medium was accumulated by plants at lowest conentration (1 microM) used in the experiment. Chromium-induced toxicity appears at 1 microM chromium resulting in the build-up of delta-aminolevulinic acid (ALA) and reduced activities of delta-aminolevulinic acid dehydratase (ALAD) and nitrate reductase (NR), total chlorophyll (Chl) and protein contents. Ch1a was more sensitive than Ch1b to chromium toxicity. It could be inferred that chromium toxicity is not located at the level of ALA synthesis, but, probably at the ALAD activity which was more severely affected during chlorophyll biosynthesis. Finally, impaired chlorophyll biosynthesis resulted in reduced total chlorophyll content.
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Affiliation(s)
- P Vajpayee
- Environmental Botany Laboratory, National Botanical Research Institute, Lucknow, India
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39
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Rai UN, Tripathi RD, Singh N, Kumar A, Ali MB, Pal A, Singh SN. Amelioration of fly-Ash by selected nitrogen fixing blue green algae. Bull Environ Contam Toxicol 2000; 64:294-301. [PMID: 10656898 DOI: 10.1007/s001289910043] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Affiliation(s)
- U N Rai
- Environmental Science Division, National Botanical Research Institute, Lucknow 226001, India
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Ali MB, Tripathi RD, Rai UN, Pal A, Singh SP. Physico-chemical characteristics and pollution level of Lake Nainital (U.P., India): role of macrophytes and phytoplankton in biomonitoring and phytoremediation of toxic metal ions. Chemosphere 1999; 39:2171-2182. [PMID: 10576113 DOI: 10.1016/s0045-6535(99)00096-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Lake Nainital is the sole source of drinking water for the local people and even to majority of tourists. In background of lake utility and its importance at national level, such study is essential which is focused on toxic metal pollution and current nutrient status of the lake and their magnification by algae and macrophytes. Study has shown that lake water is rich in nutrients which supports growth of many aquatic macrophytes and algal blooms. Besides, water is contaminated with metals like Cr, Cu, Fe, Mn, Ni, Pb and Zn. Concentration of some of them like Fe, Pb and Ni were higher than the recommended maximum permissible limits. Concentration of these metals were also found high in lake sediments. The level of metals amongst various components of lake varied considerably in different season. Plants and algae growing therein accumulated appreciable amount of metals and water roots of Salix being more efficient than others. High metal removing potential of these plants may be significant for biomonitoring studies and could be a useful phytoremediation technology to restore water quality by harvesting submerged and floating biomass inhabiting littoral zone of the lake.
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Affiliation(s)
- M B Ali
- Environmental Botany Laboratory, National Botanical Research Institute, Lucknow, India
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42
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Abstract
The aqueous extract of Balanites aegyptiaca bark, which is used in Sudanese folk medicine in the treatment of jaundice, was without effect when studied on rabbit intestine, rabbit aortic strip, rat stomach strip, rat uterus and rat phrenic nerve-diaphragm in a dose up to 10 mg/mL gut bath. In a larger dose (25 mg) the extract decreased significantly the contractility and the rate of the isolated perfused rabbit heart. Administration of the aqueous extract to biliary duct-ligated rats, showed a dose-dependent significant decrease in serum bilirubin level. The chronic and subchronic toxicity investigations indicate the safety of the aqueous extract at a dose level which showed a significant decrease in serum bilirubin level in experimental obstructive jaundice in rats.
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Affiliation(s)
- A H Mohamed
- Department of Pharmacology and Toxicology, Medicinal and Aromatic Plants, Research Institute National Center For Research, Khartoum, Sudan, PO Box 2404
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Ali MB, Mezghani M, Bejar S. A thermostable α-amylase producing maltohexaose from a new isolated Bacillus sp. US100: study of activity and molecular cloning of the corresponding gene. Enzyme Microb Technol 1999. [DOI: 10.1016/s0141-0229(98)00165-3] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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44
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Abstract
We present a rare case of a congenital bronchoesophageal fistula in a 54-year-old woman with a history of poor feeding tolerance since infancy and repeated pulmonary infections. She initially presented with epigastric and right upper quadrant abdominal pain. Her workup included a barium esophagogram that revealed a fistula between her midesophagus and a left lower lobe segmental bronchus. The fistula was divided, a left lower lobe superior segmentectomy was performed, and an intercostal muscle was placed over the esophageal closure. The patient noted an immediate decrease of postprandial coughing. Congenital respiratory esophageal fistulas that are not associated with esophageal atresia may persist into adulthood before they become clinically apparent. The diagnosis should be considered in certain individuals with suggestive symptomatology and unexplained respiratory pathology.
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Affiliation(s)
- S Deb
- Department of Surgery, National Naval Medical Center, Bethesda, MD 20889, USA
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45
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Leinbach TR, Watkins JF, Bowen J, Ali MB, Fachurrozie SA. Off-farm employment in Indonesian transmigration: case studies from south Sumatra. Majalah Demografi Indones 1992:71-107. [PMID: 12344661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
Abstract
The authors assess the impact of off-farm employment in the context of Indonesia's transmigration program. "The central objective...is to explore and generalize transmigrant households' employment behavior with respect to off-farm activities.... The specific intent...is to focus upon the individuals participating in off-farm employment: the conditions which lead to the development of their employment behavior as well as the nature of the employment itself." (SUMMARY IN IND)
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46
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Abstract
Episodes of staphylococcal bacteremia resulting in metastatic infection have occurred in association with nasal septoplasty, and this has suggested the possible need for antimicrobial prophylaxis. In a study designed to measure the actual frequency with which transient staphylococcal bacteremia occurs during nasal septoplasty, 50 healthy patients had blood cultures drawn immediately prior to and during the procedure. Although 46% of the 50 patients studied had their nasal mucosa colonized with Staphylococcus aureus, some of the blood cultures obtained from the 50 patients showed bacterial growth. The authors conclude that staphylococcal bacteremia during nasal septoplasty is a rare occurrence, and that antimicrobial prophylaxis is unnecessary.
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Abstract
Vibrio vulnificus is associated with infection acquired during contact with sea water or with seafood, and is seldom suspected by physicians in noncoastal states. The ease of transportation of fresh raw seafood has facilitated this organism's capacity to produce disease in geographic areas in which it was previously unseen. We have reported a case of fatal Vibrio vulnificus sepsis acquired from ingestion of fresh oysters in the inland United States.
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Affiliation(s)
- M B Ali
- Department of Medicine, University of Louisville School of Medicine, Ky 40292
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48
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Abstract
A case is presented of subdural hemorrhage diagnosed in utero at 31 weeks of gestation by fetal ultrasonography. Following delivery, clinical examination of the infant revealed hydrops fetalis, right-sided cardiomegaly, hepatic dysfunction, and coagulopathy. Prompt resolution of these problems led to a retrospective diagnosis of premature closure of the foramen ovale as the precipitating event. The causes of previously reported cases of intrauterine cerebral hemorrhage are reviewed and compared to the present case.
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