1
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Seebald LM, Haratipour P, Jacobs MR, Bernstein HM, Kashemirov BA, McKenna CE, Imperiali B. Uridine Bisphosphonates Differentiate Phosphoglycosyl Transferase Superfamilies. J Am Chem Soc 2024; 146:3220-3229. [PMID: 38271668 PMCID: PMC10922802 DOI: 10.1021/jacs.3c11402] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2024]
Abstract
Complex bacterial glycoconjugates drive interactions between pathogens, symbionts, and their human hosts. Glycoconjugate biosynthesis is initiated at the membrane interface by phosphoglycosyl transferases (PGTs), which catalyze the transfer of a phosphosugar from a soluble uridine diphosphosugar (UDP-sugar) substrate to a membrane-bound polyprenol-phosphate (Pren-P). The two distinct superfamilies of PGT enzymes (polytopic and monotopic) show striking differences in their structure and mechanism. We designed and synthesized a series of uridine bisphosphonates (UBPs), wherein the diphosphate of the UDP and UDP-sugar is replaced by a substituted methylene bisphosphonate (CXY-BPs; X/Y = F/F, Cl/Cl, (S)-H/F, (R)-H/F, H/H, CH3/CH3). UBPs and UBPs incorporating an N-acetylglucosamine (GlcNAc) substituent at the β-phosphonate were evaluated as inhibitors of a polytopic PGT (WecA from Thermotoga maritima) and a monotopic PGT (PglC from Campylobacter jejuni). Although CHF-BP most closely mimics diphosphate with respect to its acid/base properties, the less basic CF2-BP conjugate more strongly inhibited PglC, whereas the more basic CH2-BP analogue was the strongest inhibitor of WecA. These surprising differences indicate different modes of ligand binding for the different PGT superfamilies, implicating a modified P-O- interaction with the structural Mg2+. For the monoPGT enzyme, the two diastereomeric CHF-BP conjugates, which feature a chiral center at the Pα-CHF-Pβ carbon, also exhibited strikingly different binding affinities and the inclusion of GlcNAc with the native α-anomer configuration significantly improved binding affinity. UBP-sugars are thus revealed as informative new mechanistic probes of PGTs that may aid development of novel antibiotic agents for the exclusively prokaryotic monoPGT superfamily.
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Affiliation(s)
- Leah M. Seebald
- Department of Biology and Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Pouya Haratipour
- Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA
| | - Michaela R. Jacobs
- Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA
| | - Hannah M. Bernstein
- Department of Biology and Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Boris A. Kashemirov
- Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA
| | - Charles E. McKenna
- Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA
| | - Barbara Imperiali
- Department of Biology and Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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2
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Gu L, Li M, Li CM, Haratipour P, Lingeman R, Jossart J, Gutova M, Flores L, Hyde C, Kenjić N, Li H, Chung V, Li H, Lomenick B, Von Hoff DD, Synold TW, Aboody KS, Liu Y, Horne D, Hickey RJ, Perry JJP, Malkas LH. Small molecule targeting of transcription-replication conflict for selective chemotherapy. Cell Chem Biol 2023; 30:1235-1247.e6. [PMID: 37531956 PMCID: PMC10592352 DOI: 10.1016/j.chembiol.2023.07.001] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Revised: 02/12/2023] [Accepted: 07/10/2023] [Indexed: 08/04/2023]
Abstract
Targeting transcription replication conflicts, a major source of endogenous DNA double-stranded breaks and genomic instability could have important anticancer therapeutic implications. Proliferating cell nuclear antigen (PCNA) is critical to DNA replication and repair processes. Through a rational drug design approach, we identified a small molecule PCNA inhibitor, AOH1996, which selectively kills cancer cells. AOH1996 enhances the interaction between PCNA and the largest subunit of RNA polymerase II, RPB1, and dissociates PCNA from actively transcribed chromatin regions, while inducing DNA double-stranded breaks in a transcription-dependent manner. Attenuation of RPB1 interaction with PCNA, by a point mutation in RPB1's PCNA-binding region, confers resistance to AOH1996. Orally administrable and metabolically stable, AOH1996 suppresses tumor growth as a monotherapy or as a combination treatment but causes no discernable side effects. Inhibitors of transcription replication conflict resolution may provide a new and unique therapeutic avenue for exploiting this cancer-selective vulnerability.
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Affiliation(s)
- Long Gu
- Department of Molecular Diagnostics & Experimental Therapeutics, Beckman Research Institute of City of Hope, Duarte, CA, USA.
| | - Min Li
- Department of Cancer Genetics and Epigenetics, Beckman Research Institute of City of Hope, Duarte, CA, USA
| | - Caroline M Li
- Department of Molecular Diagnostics & Experimental Therapeutics, Beckman Research Institute of City of Hope, Duarte, CA, USA
| | - Pouya Haratipour
- Department of Cancer Biology & Molecular Medicine, Beckman Research Institute of City of Hope, Duarte, CA, USA
| | - Robert Lingeman
- Department of Molecular Diagnostics & Experimental Therapeutics, Beckman Research Institute of City of Hope, Duarte, CA, USA
| | - Jennifer Jossart
- Department of Molecular Diagnostics & Experimental Therapeutics, Beckman Research Institute of City of Hope, Duarte, CA, USA
| | - Margarita Gutova
- Department of Developmental & Stem Cell Biology, Beckman Research Institute of City of Hope, Duarte, CA, USA
| | - Linda Flores
- Department of Developmental & Stem Cell Biology, Beckman Research Institute of City of Hope, Duarte, CA, USA
| | - Caitlyn Hyde
- Department of Developmental & Stem Cell Biology, Beckman Research Institute of City of Hope, Duarte, CA, USA
| | - Nikola Kenjić
- Department of Biochemistry, University of California Riverside, Riverside, CA, USA
| | - Haiqing Li
- Department of Genomics, Beckman Research Institute of City of Hope, Duarte, CA, USA
| | - Vincent Chung
- Department of Medical Oncology, City of Hope, Duarte, CA, USA
| | - Hongzhi Li
- Department of Bioinformatics, Beckman Research Institute of City of Hope, Duarte, CA, USA
| | - Brett Lomenick
- Proteome Exploration Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - Daniel D Von Hoff
- Clinical Translational Research Division, Translational Genomics Research Institute, 445N 5th Street, Phoenix, AZ 85004, USA
| | - Timothy W Synold
- Department of Medical Oncology and Therapeutics Research, Beckman Research Institute of City of Hope, Duarte, CA, USA
| | - Karen S Aboody
- Department of Developmental & Stem Cell Biology, Beckman Research Institute of City of Hope, Duarte, CA, USA
| | - Yilun Liu
- Department of Cancer Genetics and Epigenetics, Beckman Research Institute of City of Hope, Duarte, CA, USA
| | - David Horne
- Department of Cancer Biology & Molecular Medicine, Beckman Research Institute of City of Hope, Duarte, CA, USA
| | - Robert J Hickey
- Department of Cancer Biology & Molecular Medicine, Beckman Research Institute of City of Hope, Duarte, CA, USA
| | - J Jefferson P Perry
- Department of Molecular Diagnostics & Experimental Therapeutics, Beckman Research Institute of City of Hope, Duarte, CA, USA
| | - Linda H Malkas
- Department of Molecular Diagnostics & Experimental Therapeutics, Beckman Research Institute of City of Hope, Duarte, CA, USA
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3
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Seebald LM, Haratipour P, Jacobs MR, Bernstein HM, Kashemirov BA, McKenna CE, Imperiali B. Uridine Bisphosphonates Differentiate Phosphoglycosyl Transferase Superfamilies. bioRxiv 2023:2023.09.19.558431. [PMID: 37786673 PMCID: PMC10541605 DOI: 10.1101/2023.09.19.558431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
Complex bacterial glycoconjugates are essential for bacterial survival, and drive interactions between pathogens and symbionts, and their human hosts. Glycoconjugate biosynthesis is initiated at the membrane interface by phosphoglycosyl transferases (PGTs), which catalyze the transfer of a phosphosugar from a soluble uridine diphospho-sugar (UDP-sugar) substrate to a membrane-bound polyprenol-phosphate (Pren-P). Two distinct superfamilies of PGT enzymes, denoted as polytopic and monotopic, carry out this reaction but show striking differences in structure and mechanism. With the goal of creating non-hydrolyzable mimics (UBP-sugars) of the UDP-sugar substrates as chemical probes to interrogate critical aspects of these essential enzymes, we designed and synthesized a series of uridine bisphosphonates (UBPs), wherein the diphosphate bridging oxygen of the UDP and UDP-sugar is replaced by a substituted methylene group (CXY; X/Y = F/F, Cl/Cl, (S)-H/F, (R)-H/F, H/H, CH3/CH3). These compounds, which incorporated as the conjugating sugar an N-acetylglucosamine (GlcNAc) substituent at the β-phosphonate, were evaluated as inhibitors of a representative polytopic PGT (WecA from Thermotoga maritima) and a monotopic PGT (PglC from Campylobacter jejuni). Although CHF-BP most closely mimics pyrophosphate with respect to its acid/base properties, the less basic CF2-BP conjugate most strongly inhibited PglC, whereas the more basic CH2-BP analogue was the strongest inhibitor of WecA. These surprising differences indicate different modes of ligand binding for the different PGT superfamilies implicating a modified P-O- interaction with the structural Mg2+, consistent with their catalytic divergence. Furthermore, at least for the monoPGT superfamily example, this was not the sole determinant of ligand binding: the two diastereomeric CHF-BP conjugates, which feature a chiral center at the Pα-CHF-Pβ carbon, exhibited strikingly different binding affinities and the inclusion of GlcNAc with the native α-anomer configuration significantly improved binding affinity. UBP-sugars are a valuable tool for elucidating the structures and mechanisms of the distinct PGT superfamilies and offer a promising scaffold to develop novel antibiotic agents for the exclusively prokaryotic monoPGT superfamily.
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Affiliation(s)
- Leah M. Seebald
- Department of Biology and Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Pouya Haratipour
- Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA
| | - Michaela R. Jacobs
- Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA
| | - Hannah M. Bernstein
- Department of Biology and Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Boris A. Kashemirov
- Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA
| | - Charles E. McKenna
- Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA
| | - Barbara Imperiali
- Department of Biology and Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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4
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Abstract
Three novel 8-oxo-dGTP bisphosphonate analogues of 3 in which the bridging β,γ-oxygen is replaced by a methylene, fluoromethylene or difluoromethylene group (4-6, respectively) have been synthesized from 8-oxo-dGMP 2 by reaction of its morpholine 5'-phosphoramidate 14 or preferably, its N-methylimidazole 5'-phosphoramidate 15 with n-tributylammonium salts of the appropriate bisphosphonic acids, 11-13. The latter method also provides a convenient new route to 3. Analogues 4-6 may be useful as mechanistic probes for the role of 3 in abnormal DNA replication and repair.
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Affiliation(s)
- Yiying Zheng
- Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA
| | - Pouya Haratipour
- Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA
| | - Boris A. Kashemirov
- Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA
| | - Charles E. McKenna
- Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA
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5
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Setterholm NA, Haratipour P, Kashemirov BA, McKenna CE, Joyce GF. Kinetic Effects of β,γ-Modified Deoxynucleoside 5'-Triphosphate Analogues on RNA-Catalyzed Polymerization of DNA. Biochemistry 2020; 60:1-5. [PMID: 33356161 DOI: 10.1021/acs.biochem.0c00779] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A recently described DNA polymerase ribozyme, obtained by in vitro evolution, provides the opportunity to investigate mechanistic features of RNA catalysis using methods that previously had only been applied to DNA polymerase proteins. Insight can be gained into the transition state of the DNA polymerization reaction by studying the behavior of various β,γ-bridging substituted methylene (CXY; X, Y = H, halo, methyl) or imido (NH) dNTP analogues that differ with regard to the pKa4 of the bisphosphonate or imidodiphosphate leaving group. The apparent rate constant (kpol) of the polymerase ribozyme was determined for analogues of dGTP and dCTP that span a broad range of acidities for the leaving group, ranging from 7.8 for the CF2-bisphosphonate to 11.6 for the CHCH3-bisphosphonate. A Brønsted plot of log(kpol) versus pKa4 of the leaving group demonstrates linear free energy relationships (LFERs) for dihalo-, monohalo-, and non-halogen-substituted analogues of the dNTPs, with negative slopes, as has been observed for DNA polymerase proteins. The unsubstituted dNTPs have a faster catalytic rate than would be predicted from consideration of the linear free energy relationship alone, presumably due to a relatively more favorable interaction of the β,γ-bridging oxygen within the active site. Although the DNA polymerase ribozyme is considerably slower than DNA polymerase proteins, it exhibits a similar LFER fingerprint, suggesting mechanistic commonality pertaining to the buildup of negative charge in the transition state, despite the very different chemical compositions of the two catalysts.
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Affiliation(s)
- Noah A Setterholm
- The Salk Institute, Jack H. Skirball Center for Chemical Biology and Proteomics, 10010 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Pouya Haratipour
- Department of Chemistry, Dana and David Dornsife College of Letters, Arts, and Sciences, University of Southern California, University Park Campus, Los Angeles, California 90089, United States
| | - Boris A Kashemirov
- Department of Chemistry, Dana and David Dornsife College of Letters, Arts, and Sciences, University of Southern California, University Park Campus, Los Angeles, California 90089, United States
| | - Charles E McKenna
- Department of Chemistry, Dana and David Dornsife College of Letters, Arts, and Sciences, University of Southern California, University Park Campus, Los Angeles, California 90089, United States
| | - Gerald F Joyce
- The Salk Institute, Jack H. Skirball Center for Chemical Biology and Proteomics, 10010 North Torrey Pines Road, La Jolla, California 92037, United States
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6
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Haratipour P, Minard C, Nakhjiri M, Negahbani A, Chamberlain BT, Osuna J, Upton TG, Zhao M, Kashemirov BA, McKenna CE. Completing the β,γ-CXY-dNTP Stereochemical Probe Toolkit: Synthetic Access to the dCTP Diastereomers and 31P and 19F NMR Correlations with Absolute Configurations. J Org Chem 2020; 85:14592-14609. [PMID: 33125847 DOI: 10.1021/acs.joc.0c01204] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Nucleoside 5'-triphosphate (dNTP) analogues in which the β,γ-oxygen is mimicked by a CXY group (β,γ-CXY-dNTPs) have provided information about DNA polymerase catalysis and fidelity. Definition of CXY stereochemistry is important to elucidate precise binding modes. We previously reported the (R)- and (S)-β,γ-CHX-dGTP diastereomers (X = F, Cl), prepared via P,C-dimorpholinamide CHCl (6a, 6b) and CHF (7a, 7b) bisphosphonates (BPs) equipped with an (R)-mandelic acid as a chiral auxiliary, with final deprotection using H2/Pd. This method also affords the β,γ-CHCl-dTTP (11a, 11b), β,γ-CHF (12a, 12b), and β,γ-CHCl (13a, 13b) dATP diastereomers as documented here, but the reductive deprotection step is not compatible with dCTP or the bromo substituent in β,γ-CHBr-dNTP analogues. To complete assembly of the toolkit, we describe an alternative synthetic strategy featuring ethylbenzylamine or phenylglycine-derived chiral BP synthons incorporating a photolabile protecting group. After acid-catalyzed removal of the (R)-(+)-α-ethylbenzylamine auxiliary, coupling with activated dCMP and photochemical deprotection, the individual diastereomers of β,γ-CHBr- (33a, 33b), β,γ-CHCl- (34a, 34b), β,γ-CHF-dCTP (35a, 35b) were obtained. The β,γ-CH(CH3)-dATPs (44a, 44b) were obtained using a methyl (R)-(-)-phenylglycinate auxiliary. 31P and 19F NMR Δδ values are correlated with CXY stereochemistry and pKa2-4 values for 13 CXY-bisphosphonic acids and imidodiphosphonic acid are tabulated.
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Affiliation(s)
- Pouya Haratipour
- Department of Chemistry, Dana and David Dornsife College of Letters, Arts and Sciences, University of Southern California, University Park Campus, Los Angeles, California 90089, United States
| | - Corinne Minard
- Department of Chemistry, Dana and David Dornsife College of Letters, Arts and Sciences, University of Southern California, University Park Campus, Los Angeles, California 90089, United States
| | - Maryam Nakhjiri
- Department of Chemistry, Dana and David Dornsife College of Letters, Arts and Sciences, University of Southern California, University Park Campus, Los Angeles, California 90089, United States
| | - Amirsoheil Negahbani
- Department of Chemistry, Dana and David Dornsife College of Letters, Arts and Sciences, University of Southern California, University Park Campus, Los Angeles, California 90089, United States
| | - Brian T Chamberlain
- Department of Chemistry, Dana and David Dornsife College of Letters, Arts and Sciences, University of Southern California, University Park Campus, Los Angeles, California 90089, United States
| | - Jorge Osuna
- Department of Chemistry, Dana and David Dornsife College of Letters, Arts and Sciences, University of Southern California, University Park Campus, Los Angeles, California 90089, United States
| | - Thomas G Upton
- Department of Chemistry, Dana and David Dornsife College of Letters, Arts and Sciences, University of Southern California, University Park Campus, Los Angeles, California 90089, United States
| | - Michelle Zhao
- Department of Chemistry, Dana and David Dornsife College of Letters, Arts and Sciences, University of Southern California, University Park Campus, Los Angeles, California 90089, United States
| | - Boris A Kashemirov
- Department of Chemistry, Dana and David Dornsife College of Letters, Arts and Sciences, University of Southern California, University Park Campus, Los Angeles, California 90089, United States
| | - Charles E McKenna
- Department of Chemistry, Dana and David Dornsife College of Letters, Arts and Sciences, University of Southern California, University Park Campus, Los Angeles, California 90089, United States
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7
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Heydarpour F, Sajadimajd S, Mirzarazi E, Haratipour P, Joshi T, Farzaei MH, Khan H, Echeverría J. Involvement of TGF-β and Autophagy Pathways in Pathogenesis of Diabetes: A Comprehensive Review on Biological and Pharmacological Insights. Front Pharmacol 2020; 11:498758. [PMID: 33041786 PMCID: PMC7522371 DOI: 10.3389/fphar.2020.498758] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [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: 09/17/2019] [Accepted: 08/27/2020] [Indexed: 12/21/2022] Open
Abstract
Despite recent advancements in clinical drugs, diabetes treatment still needs further progress. As such, ongoing research has attempted to determine the precise molecular mechanisms of the disorder. Specifically, evidence supports that several signaling pathways play pivotal roles in the development of diabetes. However, the exact molecular mechanisms of diabetes still need to be explored. This study examines exciting new hallmarks for the strict involvement of autophagy and TGF-β signaling pathways in the pathogenesis of diabetes and the design of novel therapeutic strategies. Dysregulated autophagy in pancreatic β cells due to hyperglycemia, oxidative stress, and inflammation is associated with diabetes and accompanied by dysregulated autophagy in insulin target tissues and the progression of diabetic complications. Consequently, several therapeutic agents such as adiponectin, ezetimibe, GABA tea, geniposide, liraglutide, guava extract, and vitamin D were shown to inhibit diabetes and its complications through modulation of the autophagy pathway. Another pathway, TGF-β signaling pathway, appears to play a part in the progression of diabetes, insulin resistance, and autoimmunity in both type 1 and 2 diabetes and complications in diabetes. Subsequently, drugs that target TGF-β signaling, especially naturally derived ones such as resveratrol, puerarin, curcumin, hesperidin, and silymarin, as well as Propolis, Lycopus lucidus, and Momordica charantia extracts, may become promising alternatives to current drugs in diabetes treatment. This review provides keen insights into novel therapeutic strategies for the medical care of diabetes.
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Affiliation(s)
- Fatemeh Heydarpour
- Medical Biology Research Center, Health Technology Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Soraya Sajadimajd
- Departament of Biology, Faculty of Sciences, Razi University, Kermanshah, Iran
| | - Elahe Mirzarazi
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
| | - Pouya Haratipour
- Department of Chemistry, Sharif University of Technology, Tehran, Iran.,PhytoPharmacology Interest Group (PPIG), Universal Scientific Education and Research Network (USERN), Los Angeles, CA, United States
| | - Tanuj Joshi
- Department of Pharmaceutical Sciences, Faculty of Technology, Kumaun University, Nainital, India
| | - Mohammad Hosein Farzaei
- Pharmaceutical Sciences Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Haroon Khan
- Department of Pharmacy, Abdul Wali Khan University, Mardan, Pakistan
| | - Javier Echeverría
- Departamento de Ciencias del Ambiente, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
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8
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Alnajjar KS, Krylov IS, Negahbani A, Haratipour P, Kashemirov BA, Huang J, Mahmoud M, McKenna CE, Goodman MF, Sweasy JB. A pre-catalytic non-covalent step governs DNA polymerase β fidelity. Nucleic Acids Res 2020; 47:11839-11849. [PMID: 31732732 PMCID: PMC7145665 DOI: 10.1093/nar/gkz1076] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Revised: 10/23/2019] [Accepted: 11/07/2019] [Indexed: 12/27/2022] Open
Abstract
DNA polymerase β (pol β) selects the correct deoxyribonucleoside triphosphate for incorporation into the DNA polymer. Mistakes made by pol β lead to mutations, some of which occur within specific sequence contexts to generate mutation hotspots. The adenomatous polyposis coli (APC) gene is mutated within specific sequence contexts in colorectal carcinomas but the underlying mechanism is not fully understood. In previous work, we demonstrated that a somatic colon cancer variant of pol β, K289M, misincorporates deoxynucleotides at significantly increased frequencies over wild-type pol β within a mutation hotspot that is present several times within the APC gene. Kinetic studies provide evidence that the rate-determining step of pol β catalysis is phosphodiester bond formation and suggest that substrate selection is governed at this step. Remarkably, we show that, unlike WT, a pre-catalytic step in the K289M pol β kinetic pathway becomes slower than phosphodiester bond formation with the APC DNA sequence but not with a different DNA substrate. Based on our studies, we propose that pre-catalytic conformational changes are of critical importance for DNA polymerase fidelity within specific DNA sequence contexts.
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Affiliation(s)
- Khadijeh S Alnajjar
- Department of Cellular and Molecular Medicine, University of Arizona, Tucson, AZ 85724, USA
| | - Ivan S Krylov
- Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA
| | - Amirsoheil Negahbani
- Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA
| | - Pouya Haratipour
- Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA
| | - Boris A Kashemirov
- Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA
| | - Ji Huang
- Department of Cellular and Molecular Medicine, University of Arizona, Tucson, AZ 85724, USA
| | - Mariam Mahmoud
- Department of Cellular and Molecular Medicine, University of Arizona, Tucson, AZ 85724, USA
| | - Charles E McKenna
- Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA
| | - Myron F Goodman
- Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA.,Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA
| | - Joann B Sweasy
- Department of Cellular and Molecular Medicine, University of Arizona, Tucson, AZ 85724, USA.,University of Arizona Cancer Center, Tucson, AZ 85724, USA
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9
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Sajadimajd S, Momtaz S, Haratipour P, El-Senduny FF, Panah AI, Navabi J, Soheilikhah Z, Farzaei MH, Rahimi R. Molecular Mechanisms Underlying Cancer Preventive and Therapeutic Potential of Algal Polysaccharides. Curr Pharm Des 2019; 25:1210-1235. [DOI: 10.2174/1381612825666190425155126] [Citation(s) in RCA: 11] [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: 03/18/2019] [Accepted: 04/15/2019] [Indexed: 12/22/2022]
Abstract
Background:
Algal polysaccharide and oligosaccharide derivatives have been shown to possess a
variety of therapeutic potentials and drug delivery applications. Algal polysaccharides contain sulfated sugar
monomers derived from seaweed including brown, red, and green microalgae. Here, in this review, the recent
progress of algal polysaccharides’ therapeutic applications as anticancer agents, as well as underlying cellular and
molecular mechanisms was investigated. Moreover, recent progress in the structural chemistry of important polysaccharides
with anticancer activities were illustrated.
Methods:
Electronic databases including “Scopus”, “PubMed”, and “Cochrane library” were searched using the
keywords “cancer”, or “tumor”, or “malignancy” in title/abstract, along with “algae”, or “algal” in the whole text
until July 2018. Only English language papers were included.
Results:
The most common polysaccharides involved in cancer management were sulfated polysaccharides, Fucoidans,
Carageenans, and Ulvan from different species of algae that have been recognized in vitro and in vivo.
The underlying anticancer mechanisms of algal polysaccharides included induction of apoptosis, cell cycle arrest,
modulation of transduction signaling pathways, suppression of migration and angiogenesis, as well as activation
of immune responses and antioxidant system. VEGF/VEGFR2, TGFR/Smad/Snail, TLR4/ROS/ER, CXCL12/
CXCR4, TGFR/Smad7/Smurf2, PI3K/AKT/mTOR, PBK/TOPK, and β-catenin/Wnt are among the main cellular
signaling pathways which have a key role in the preventive and therapeutic effects of algal polysaccharides
against oncogenesis.
Conclusion:
Algal polysaccharides play a crucial role in the management of cancer and may be considered the
next frontier in pharmaceutical research. Further well-designed clinical trials are mandatory to evaluate the efficacy
and safety of algal polysaccharides in patients with cancer.
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Affiliation(s)
| | - Saeideh Momtaz
- Medicinal Plants Research Center, Institute of Medicinal Plants, ACECR, Karaj, Iran
| | - Pouya Haratipour
- Department of Chemistry, Sharif University of Technology, Tehran, Iran
| | - Fardous F. El-Senduny
- Biochemistry Division, Chemistry Department, Faculty of Science, Mansoura University, Mansoura 35516, Egypt
| | - Amin Iran Panah
- Pharmaceutical Sciences Research Center, Health Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Jafar Navabi
- Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Zhaleh Soheilikhah
- Pharmaceutical Sciences Research Center, Health Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Mohammad Hosein Farzaei
- Pharmaceutical Sciences Research Center, Health Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Roja Rahimi
- Department of Traditional Pharmacy, School of Persian Medicine, Tehran University of Medical Sciences, Tehran 1416663361, Iran
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10
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Joshi T, Singh AK, Haratipour P, Sah AN, Pandey AK, Naseri R, Juyal V, Farzaei MH. Targeting AMPK signaling pathway by natural products for treatment of diabetes mellitus and its complications. J Cell Physiol 2019; 234:17212-17231. [DOI: 10.1002/jcp.28528] [Citation(s) in RCA: 71] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Revised: 02/27/2019] [Accepted: 03/06/2019] [Indexed: 01/01/2023]
Affiliation(s)
- Tanuj Joshi
- Department of Pharmaceutical Sciences Bhimtal, Kumaun University (Nainital) Uttarakhand India
| | - Amit Kumar Singh
- Department of Biochemistry University of Allahabad Allahabad India
| | - Pouya Haratipour
- Department of Chemistry Sharif University of Technology Tehran Iran
- PhytoPharmacology Interest Group (PPIG) Universal Scientific Education and Research Network (USERN) Los Angeles California
| | - Archana Negi Sah
- Department of Pharmaceutical Sciences Bhimtal, Kumaun University (Nainital) Uttarakhand India
| | - Abhay K. Pandey
- Department of Biochemistry University of Allahabad Allahabad India
| | - Rozita Naseri
- Internal Medicine Department, Faculty of Medicine Kermanshah University of Medical Sciences Kermanshah Iran
| | - Vijay Juyal
- Department of Pharmaceutical Sciences Bhimtal, Kumaun University (Nainital) Uttarakhand India
| | - Mohammad H. Farzaei
- Pharmaceutical Sciences Research Center Kermanshah University of Medical Sciences Kermanshah Iran
- Medical Biology Research Center Kermanshah University of Medical Sciences Kermanshah Iran
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11
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Oertell K, Florián J, Haratipour P, Crans DC, Kashemirov BA, Wilson SH, McKenna CE, Goodman MF. A Transition-State Perspective on Y-Family DNA Polymerase η Fidelity in Comparison with X-Family DNA Polymerases λ and β. Biochemistry 2019; 58:1764-1773. [PMID: 30839203 DOI: 10.1021/acs.biochem.9b00087] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Deoxynucleotide misincorporation efficiencies can span a wide 104-fold range, from ∼10-2 to ∼10-6, depending principally on polymerase (pol) identity and DNA sequence context. We have addressed DNA pol fidelity mechanisms from a transition-state (TS) perspective using our "tool-kit" of dATP- and dGTP-β,γ substrate analogues in which the pyrophosphate leaving group (p Ka4 = 8.9) has been replaced by a series of bisphosphonates covering a broad acidity range spanning p Ka4 values from 7.8 (CF2) to 12.3 [C(CH3)2]. Here, we have used a linear free energy relationship (LFER) analysis, in the form of a Brønsted plot of log( kpol) versus p Ka4, for Y-family error-prone pol η and X-family pols λ and β to determine the extent to which different electrostatic active site environments alter kpol values. The apparent chemical rate constant ( kpol) is the rate-determining step for the three pols. The pols each exhibit a distinct catalytic signature that differs for formation of right (A·T) and wrong (G·T) incorporations observed as changes in slopes and displacements of the Brønsted lines, in relation to a reference LFER. Common to this signature among all three pols is a split linear pattern in which the analogues containing two halogens show kpol values that are systematically lower than would be predicted from their p Ka4 values measured in aqueous solution. We discuss how metal ions and active site amino acids are responsible for causing "effective" p Ka4 values that differ for dihalo and non-dihalo substrates as well as for individual R and S stereoisomers for CHF and CHCl.
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Affiliation(s)
- Keriann Oertell
- Department of Biological Sciences, Dana and David Dornsife College of Letters, Arts, and Sciences , University of Southern California , University Park Campus , Los Angeles , California 90089 , United States
| | - Jan Florián
- Department of Chemistry and Biochemistry , Loyola University Chicago , 1032 West Sheridan Road , Chicago , Illinois 60660 , United States
| | - Pouya Haratipour
- Department of Chemistry, Dana and David Dornsife College of Letters, Arts, and Sciences , University of Southern California , University Park Campus , Los Angeles , California 90089 , United States
| | - Debbie C Crans
- Department of Chemistry , Colorado State University , Fort Collins , Colorado 80523 , United States
| | - Boris A Kashemirov
- Department of Chemistry, Dana and David Dornsife College of Letters, Arts, and Sciences , University of Southern California , University Park Campus , Los Angeles , California 90089 , United States
| | - Samuel H Wilson
- Genome Integrity and Structural Biology Laboratory, National Institute of Environmental Health Sciences , National Institutes of Health , Research Triangle Park , North Carolina 27709 , United States
| | - Charles E McKenna
- Department of Chemistry, Dana and David Dornsife College of Letters, Arts, and Sciences , University of Southern California , University Park Campus , Los Angeles , California 90089 , United States
| | - Myron F Goodman
- Department of Biological Sciences, Dana and David Dornsife College of Letters, Arts, and Sciences , University of Southern California , University Park Campus , Los Angeles , California 90089 , United States.,Department of Chemistry, Dana and David Dornsife College of Letters, Arts, and Sciences , University of Southern California , University Park Campus , Los Angeles , California 90089 , United States
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12
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Haratipour P, Minard C, Nakhjiri M, Negahbani A, Kashemirov BA, McKenna CE. New Chirally Modified Bisphosphonates for Synthesis of Individual Beta,Gamma-CHX-Deoxynucleotide Diastereomers. PHOSPHORUS SULFUR 2019; 194:329-330. [PMID: 32377060 DOI: 10.1080/10426507.2018.1540482] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Individual diastereomers of CXY bisphosphonate analogues of dNTPs or NTPs are useful chemical stereoprobes to investigate interactions within the chiral active site environment of enzymes such as polymerases and kinases. We previously reported synthetic access to β,γ-CHX-dGTPs (X = F or Cl) via a bisphosphonate synthon with an (R)-methyl mandelate auxiliary and have extended this approach to dTTP and dATP analogues. As removal of the chiral auxiliary by (Pd/C) hydrogenolysis is incompatible with the cytosine heterocycle and also with X = Br, we have now designed bisphosphonate synthons using (R)-(+)-α-ethylbenzylamine or methyl (R)-(-)-phenylglycine auxiliaries and equipped with an o-nitrobenzyl ester protecting group allowing photochemical deprotection. These new synthons have made possible the first syntheses of individual dCTP and monobromo-substituted dNTP β,γ-CHX diastereomers.
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Affiliation(s)
- Pouya Haratipour
- Department of Chemistry, Dana and David Dornsife College of Letters, Arts and Sciences, University of Southern California, Los Angeles, California, U.S.A
| | - Corinne Minard
- Department of Chemistry, Dana and David Dornsife College of Letters, Arts and Sciences, University of Southern California, Los Angeles, California, U.S.A
| | - Maryam Nakhjiri
- Department of Chemistry, Dana and David Dornsife College of Letters, Arts and Sciences, University of Southern California, Los Angeles, California, U.S.A
| | - Amirsoheil Negahbani
- Department of Chemistry, Dana and David Dornsife College of Letters, Arts and Sciences, University of Southern California, Los Angeles, California, U.S.A
| | - Boris A Kashemirov
- Department of Chemistry, Dana and David Dornsife College of Letters, Arts and Sciences, University of Southern California, Los Angeles, California, U.S.A
| | - Charles E McKenna
- Department of Chemistry, Dana and David Dornsife College of Letters, Arts and Sciences, University of Southern California, Los Angeles, California, U.S.A
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13
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Naseri R, Farzaei F, Haratipour P, Nabavi SF, Habtemariam S, Farzaei MH, Khodarahmi R, Tewari D, Momtaz S. Anthocyanins in the Management of Metabolic Syndrome: A Pharmacological and Biopharmaceutical Review. Front Pharmacol 2018; 9:1310. [PMID: 30564116 PMCID: PMC6288909 DOI: 10.3389/fphar.2018.01310] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [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: 03/14/2018] [Accepted: 10/26/2018] [Indexed: 12/14/2022] Open
Abstract
The term "metabolic syndrome" (MetS) refers to a combination of diabetes, high blood pressure, and obesity. The origin of MetS includes a combination of multiple factors, such as sedentary lifestyle, unhealthy diet choice, and genetic factors. MetS is highly prevalent and adversely affects the general population by elevating risk of cardiovascular complications, organ failure, and much other pathology associated with late-stage diabetes. Anthocyanins (ANTs) are health-promoting bioactive compounds belonging to the flavonoids subclass of polyphenols. Numerous studies have reported the potential therapeutic benefits on MetS syndrome and diabetes from fruits rich in ANTs. This review summarizes the role of several dietary ANTs on preventing and managing MetS as well as the pharmacological mechanisms and biopharmaceutical features of their action. We also discuss potential nanoformulation and encapsulation approaches that may enhance the bioefficacy of ANTs in MetS. Experiments have demonstrated that ANTs may attenuate the symptoms of MetS via improving insulin resistance, impaired glucose tolerance, dyslipidaemia, cholesterol levels, hypertension, blood glucose, protecting β cells, and preventing free radical production. In brief, the intake of ANT-rich supplements should be considered due to their plausible ability for prevention and management of MetS. Additionally, randomized double-blind clinical trials are obligatory for evaluating the bioefficacy and pharmacological mechanisms of ANTs and their pharmaceutical formulations in patients with MetS.
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Affiliation(s)
- Rozita Naseri
- Internal Medicine Department, School of Medicine, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Fatemeh Farzaei
- Pharmaceutical Sciences Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Pouya Haratipour
- Department of Chemistry, Sharif University of Technology, Tehran, Iran
- Phyto Pharmacology Interest Group, Universal Scientific Education and Research Network, Los Angeles, CA, United States
| | - Seyed Fazel Nabavi
- Applied Biotechnology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Solomon Habtemariam
- Pharmacognosy Research Laboratories, Medway School of Science, University of Greenwich, Kent, United Kingdom
| | - Mohammad Hosein Farzaei
- Pharmaceutical Sciences Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Reza Khodarahmi
- Medical Biology Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Devesh Tewari
- Department of Pharmaceutical Sciences, Faculty of Technology, Kumaun University, Nainital, India
| | - Saeideh Momtaz
- Medicinal Plants Research Center, Institute of Medicinal Plants, ACECR, Karaj, Iran
- Toxicology and Diseases Group, The Institute of Pharmaceutical Sciences, Tehran University of Medical Sciences, Tehran, Iran
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14
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Taghipour YD, Bahramsoltani R, Marques AM, Naseri R, Rahimi R, Haratipour P, Panah AI, Farzaei MH, Abdollahi M. A systematic review of nano formulation of natural products for the treatment of inflammatory bowel disease: drug delivery and pharmacological targets. Daru 2018; 26:229-239. [PMID: 30382546 PMCID: PMC6279665 DOI: 10.1007/s40199-018-0222-4] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [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: 08/14/2018] [Accepted: 10/10/2018] [Indexed: 12/17/2022] Open
Abstract
Inflammatory bowel diseases (IBD), which is classified into Crohn's disease and ulcerative colitis, are among chronic gastrointestinal diseases with unknown pathogenesis. Diverse strategies have been applied for the treatment of this chronic disease. However, selective and site-specific routes of drug delivery to the inflamed location of the colon remain of high importance. Consequently, the application and effects of natural products in the form of nanoformulation and stimuli responsive nanoparticles as a novel strategy for the treatment of IBD are discussed in this review article. This approach may potentially overcome some complications that are associated with conventional means of colon drug delivery. Meanwhile, in vitro and in vivo studies pave the way for understanding of the mechanism that lies behind this chronic relapsing disease and potentially more effective treatment. Graphical abstract ᅟ.
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Affiliation(s)
- Yasamin Davatgaran Taghipour
- Department of Medical Nanotechnology, School of Advanced Medical Sciences, Tabriz University of Medical Sciences, Tabriz, Iran
- PhytoPharmacology Interest Group (PPIG), Universal Scientific Education and Research Network (USERN), Tehran, Iran
- Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Roodabeh Bahramsoltani
- PhytoPharmacology Interest Group (PPIG), Universal Scientific Education and Research Network (USERN), Tehran, Iran
- Department of Pharmacy in Persian Medicine, School of Persian Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - André M. Marques
- Oswaldo Cruz Foundation (FIOCRUZ), Institute of Technology in Pharmaceuticals (Farmanguinhos), Rio de Janeiro, RJ Brazil
| | - Rozita Naseri
- Internal Medicine Department, Faculty of Medicine, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Roja Rahimi
- Department of Pharmacy in Persian Medicine, School of Persian Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Pouya Haratipour
- Department of Chemistry, Sharif University of Technology, Tehran, Iran
- PhytoPharmacology Interest Group (PPIG), Universal Scientific Education and Research Network (USERN), Los Angeles, CA USA
| | - Amin Iran Panah
- Faculty of Pharmacy, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Mohammad Hosein Farzaei
- Pharmaceutical Sciences Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran
- Medical Biology Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Mohammad Abdollahi
- Toxicology and Diseases Group, The Institute of Pharmaceutical Sciences (TIPS), Tehran University of Medical Sciences, Tehran, Iran
- Department of Toxicology and Pharmacology, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
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15
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Taghipour YD, Bahramsoltani R, Marques AM, Naseri R, Rahimi R, Haratipour P, Iranpanah A, Farzaei MH, Abdollahi M. Correction to: A systematic review of nano formulation of natural products for the treatment of inflammatory bowel disease: drug delivery and pharmacological targets. ACTA ACUST UNITED AC 2018; 26:241-242. [PMID: 30478655 PMCID: PMC6279662 DOI: 10.1007/s40199-018-0230-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The corresponding author, Mohammad Hosein Farzaei, affiliation is Pharmaceutical Sciences Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran. The correct spelling of the 7th author surname is Iranpanah.
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Affiliation(s)
- Yasamin Davatgaran Taghipour
- Department of Medical Nanotechnology, School of Advanced Medical Sciences, Tabriz University of Medical Sciences, Tabriz, Iran
- PhytoPharmacology Interest Group (PPIG), Universal Scientific Education and Research Network (USERN), Tehran, Iran
- Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Roodabeh Bahramsoltani
- PhytoPharmacology Interest Group (PPIG), Universal Scientific Education and Research Network (USERN), Tehran, Iran
- Department of Pharmacy in Persian Medicine, School of Persian Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - André M. Marques
- Oswaldo Cruz Foundation (FIOCRUZ), Institute of Technology in Pharmaceuticals (Farmanguinhos), Rio de Janeiro, RJ Brazil
| | - Rozita Naseri
- Internal Medicine Department, Faculty of Medicine, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Roja Rahimi
- Department of Pharmacy in Persian Medicine, School of Persian Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Pouya Haratipour
- Department of Chemistry, Sharif University of Technology, Tehran, Iran
- PhytoPharmacology Interest Group (PPIG), Universal Scientific Education and Research Network (USERN), Los Angeles, CA USA
| | - Amin Iranpanah
- Faculty of Pharmacy, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Mohammad Hosein Farzaei
- Pharmaceutical Sciences Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran
- Medical Biology Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Mohammad Abdollahi
- Toxicology and Diseases Group, The Institute of Pharmaceutical Sciences (TIPS), Tehran University of Medical Sciences, Tehran, Iran
- Department of Toxicology and Pharmacology, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
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16
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Oertell K, Kashemirov BA, Negahbani A, Minard C, Haratipour P, Alnajjar KS, Sweasy JB, Batra VK, Beard WA, Wilson SH, McKenna CE, Goodman MF. Probing DNA Base-Dependent Leaving Group Kinetic Effects on the DNA Polymerase Transition State. Biochemistry 2018; 57:3925-3933. [PMID: 29889506 DOI: 10.1021/acs.biochem.8b00417] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We examine the DNA polymerase β (pol β) transition state (TS) from a leaving group pre-steady-state kinetics perspective by measuring the rate of incorporation of dNTPs and corresponding novel β,γ-CXY-dNTP analogues, including individual β,γ-CHF and -CHCl diastereomers with defined stereochemistry at the bridging carbon, during the formation of right (R) and wrong (W) base pairs. Brønsted plots of log kpol versus p Ka4 of the leaving group bisphosphonic acids are used to interrogate the effects of the base identity, the dNTP analogue leaving group basicity, and the precise configuration of the C-X atom in R and S stereoisomers on the rate-determining step ( kpol). The dNTP analogues provide a range of leaving group basicity and steric properties by virtue of monohalogen, dihalogen, or methyl substitution at the carbon atom bridging the β,γ-bisphosphonate that mimics the natural pyrophosphate leaving group in dNTPs. Brønsted plot relationships with negative slopes are revealed by the data, as was found for the dGTP and dTTP analogues, consistent with a bond-breaking component to the TS energy. However, greater multiplicity was shown in the linear free energy relationship, revealing an unexpected dependence on the nucleotide base for both A and C. Strong base-dependent perturbations that modulate TS relative to ground-state energies are likely to arise from electrostatic effects on catalysis in the pol active site. Deviations from a uniform linear Brønsted plot relationship are discussed in terms of insights gained from structural features of the prechemistry DNA polymerase active site.
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Affiliation(s)
| | | | | | | | | | - Khadijeh S Alnajjar
- Department of Therapeutic Radiology and Department of Genetics , Yale University School of Medicine , New Haven , Connecticut 06520 , United States
| | - Joann B Sweasy
- Department of Therapeutic Radiology and Department of Genetics , Yale University School of Medicine , New Haven , Connecticut 06520 , United States
| | - Vinod K Batra
- Genome Integrity and Structural Biology Laboratory, National Institute of Environmental Health Sciences , National Institutes of Health , Research Triangle , North Carolina 27709 , United States
| | - William A Beard
- Genome Integrity and Structural Biology Laboratory, National Institute of Environmental Health Sciences , National Institutes of Health , Research Triangle , North Carolina 27709 , United States
| | - Samuel H Wilson
- Genome Integrity and Structural Biology Laboratory, National Institute of Environmental Health Sciences , National Institutes of Health , Research Triangle , North Carolina 27709 , United States
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Gao W, Haratipour P, Kahkha MRR, Tahvili A. Ultrasound-electrospinning-assisted fabrication and sensing evaluation of a novel membrane as ultrasensitive sensor for copper (II) ions detection in aqueous environment. Ultrason Sonochem 2018; 44:152-161. [PMID: 29680598 DOI: 10.1016/j.ultsonch.2018.02.020] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2017] [Revised: 01/10/2018] [Accepted: 02/08/2018] [Indexed: 06/08/2023]
Abstract
The present study has reported an optimized fabrication and application of a novel PVA/TEOS/Schiff base nanofibers membrane as a highly sensitive copper (II) ions in aqueous environment. Here in, for first time, an ultrasound-assisted synthesized symmetric Schiff base has been immobilized on a hybrid polyvinyl alcohol (PVA) and TEOS using electrospinning technique for detection and filtration of copper ions. For this purpose, various working parameters were evaluated and finally the optimized nano fibers membrane was synthesized with 72 nm thickness and PVA/TEOS/Schiff base ratio of (wt%) 8:6:1. The optimized sample named PTLNFM has been employed successfully as an ultra sensitive chemosensor for Cu (II) detection in real samples. The immobilized Schiff base used as a chelating agent could detect copper (II) in the range from 9.34 × 10-8 to 1.15 × 10-5 mol L-1 with the following correlation equation: Absorbance = 0.066 [Cu2+] × 10-6 + 0.095 and R2 = 0.992 and LOD of 1.27 × 10-8 mol L-1 which was lower than most of the reported detection limits in the previous literatures. Validity of this method has been carried out by analysis of Cu2+ in real samples with satisfying recoveries of over 96.11-99.24%.The developed membrane could be offered for diverse use such as medical or industrial applications.
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Affiliation(s)
- Wei Gao
- School of Information Science and Technology, Yunnan Normal University, Kunming 650500, China.
| | - Pouya Haratipour
- Department of Chemistry, Sharif University of Technology, Azadi, Tehran, Iran; Universal Scientific Education and Research Network (USERN), Los Angeles, CA, USA
| | | | - Arash Tahvili
- Department of Textile Engineering, Faculty of Chamran, Rasht Branch, Technical and Vocational University (TVU), Tehran, Iran
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Parsaee Z, Haratipour P, Lariche MJ, Vojood A. A novel high performance nano chemosensor for copper (II) ion based on an ultrasound-assisted synthesized diphenylamine-based Schiff base: Design, fabrication and density functional theory calculations. Ultrason Sonochem 2018; 41:337-349. [PMID: 29137760 DOI: 10.1016/j.ultsonch.2017.09.054] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Revised: 09/28/2017] [Accepted: 09/29/2017] [Indexed: 06/07/2023]
Abstract
A novel high selective colorimetric chemosensor was introduced based on a nano diphenyl-based Schiff base (H2L), 2,2'-((1E,1'E)-(((hexylazanediyl)bis(4,1-phenylene))bis(methanylylidene))bis(azanylylidene))bis(4-methylphenol) that synthesized using sonochemical method. H2L was characterized by FT-IR, MS, TGA, 1H NMR, 13C NMR, SEM and elemental analysis techniques, then fabricated as the portable strips for sensing copper (II) ions in aqueous media. The binding interaction between H2L and various metal ions was investigated by UV-Vis spectroscopic that showed favorable coordination toward Cu2+ ion. H2L exhibited binding-induced color changes from yellow to pink and practically no interference in the presence of other metal ions, i.e., Cr2+, Mn2+, Fe2+, Co2+, Ni2+, Zn2+, Cd2+, Hg2+, Pb2+, Mg2+ and Ca2+. The chemsensor showd the color change from yellow to pink in presence of copper (II) ion in aqueous media due to binging of H2L and Cu (II). This sensor can determine the copper (II) at in the rang of 7.5 × 10-8-1.8 × 10-5 mol L-1 with a correlation equation: Absorbance = 0.0450[Cu2+] × 10-6 + 0.71 and R2 = 0.975 and low detection limit of 1.89 × 10-8 mol L-1. Density functional theory (DFT) calculations were carried out at the B3LYP levels of theory with B3LYP/6-311+G(d,p) and LANL2DZ/6-311+G(d,p) basis sets for chemosensor and its copper complex respectively. The optimized geometry, harmonic vibrational frequencies, 1H NMR and 13C NMR chemical, Molecular orbital (M.O.), Mulliken population analysis (MPA), contour of Electrostatic Potential (ESP) and Molecular Electrostatic Potential (MEP) map of H2L were calculated which show good agreement with behavior of sensor for detection of Cu2+ ion.
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Affiliation(s)
- Zohreh Parsaee
- Young Researchers and Elite Club, Bushehr Branch, Islamic Azad University, Bushehr, Iran.
| | - Pouya Haratipour
- Department of Chemistry, Sharif University of Technology, Tehran, Iran; Universal Scientific Education and Research Network (USERN), Los Angeles, CA, USA
| | | | - Arash Vojood
- Young Researchers and Elite Club, Ardabil Branch, Islamic Azad University, Ardabil, Iran
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Baghban A, Sasanipour J, Haratipour P, Alizad M, Vafaee Ayouri M. ANFIS modeling of rhamnolipid breakthrough curves on activated carbon. Chem Eng Res Des 2017. [DOI: 10.1016/j.cherd.2017.08.007] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Haratipour P, Baghban A, Mohammadi AH, Nazhad SHH, Bahadori A. On the estimation of viscosities and densities of CO 2 -loaded MDEA, MDEA + AMP, MDEA + DIPA, MDEA + MEA, and MDEA + DEA aqueous solutions. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.06.123] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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