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Effects of N-terminus modified Hx-amides on DNA binding affinity, sequence specificity, cellular uptake, and gene expression. Bioorg Med Chem Lett 2021; 47:128158. [PMID: 34058343 DOI: 10.1016/j.bmcl.2021.128158] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 05/13/2021] [Accepted: 05/25/2021] [Indexed: 12/14/2022]
Abstract
Five X-HxIP (Hx-amides) 6a-e, in which the N-terminus p-anisyl moiety is modified, were designed and synthesised with the purpose of optimising DNA binding, improving cellular uptake/nuclear penetration, and enhancing the modulation of the topoisomerase IIα (TOP2A) gene expression. The modifications include a fluorophenyl group and other heterocycles bearing different molecular shapes, size, and polarity. Like their parent compound HxIP 3, all five X-HxIP analogues bind preferentially to their cognate sequence 5'-TACGAT-3', which is found embedded on the 5' flank of the inverted CCAAT box-2 (ICB2) site in the TOP2A gene promoter, and inhibit protein complex binding. Interestingly, the 4-pyridyl analog 6a exhibits greater binding affinity for the target DNA sequence and abolishes the protein:ICB2 interaction in vitro, at a lower concentration, compared to the prototypical compound HxIP 3. Analogues 6b-e, display improved DNA sequence specificity, but reduced binding affinity for the cognate sequence, relative to the unmodified HxIP 3, with polyamides 6b and 6e being the most sequence selective. However, unlike 3 and 6b, 6a was unable to enter cells, access the nucleus and thereby affect TOP2A gene expression in confluent human lung cancer cells. These results show that while DNA binding affinity and sequence selectivity are important, consideration of cellular uptake and concentration in the nucleus are critical when exerting biological activity is the desired outcome. By characterising the DNA binding, cellular uptake and gene regulatory properties of these small molecules, we can elucidate the determinants of the elicited biological activity, which can be impacted by even small structural modifications in the polyamide molecular design.
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Nardone V, Chaves-Sanjuan A, Lapi M, Airoldi C, Saponaro A, Pasqualato S, Dolfini D, Camilloni C, Bernardini A, Gnesutta N, Mantovani R, Nardini M. Structural Basis of Inhibition of the Pioneer Transcription Factor NF-Y by Suramin. Cells 2020; 9:E2370. [PMID: 33138093 PMCID: PMC7692634 DOI: 10.3390/cells9112370] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Revised: 10/25/2020] [Accepted: 10/26/2020] [Indexed: 12/27/2022] Open
Abstract
NF-Y is a transcription factor (TF) comprising three subunits (NF-YA, NF-YB, NF-YC) that binds with high specificity to the CCAAT sequence, a widespread regulatory element in gene promoters of prosurvival, cell-cycle-promoting, and metabolic genes. Tumor cells undergo "metabolic rewiring" through overexpression of genes involved in such pathways, many of which are under NF-Y control. In addition, NF-YA appears to be overexpressed in many tumor types. Thus, limiting NF-Y activity may represent a desirable anti-cancer strategy, which is an ongoing field of research. With virtual-screening docking simulations on a library of pharmacologically active compounds, we identified suramin as a potential NF-Y inhibitor. We focused on suramin given its high water-solubility that is an important factor for in vitro testing, since NF-Y is sensitive to DMSO. By electrophoretic mobility shift assays (EMSA), isothermal titration calorimetry (ITC), STD NMR, X-ray crystallography, and molecular dynamics (MD) simulations, we showed that suramin binds to the histone fold domains (HFDs) of NF-Y, preventing DNA-binding. Our analyses, provide atomic-level detail on the interaction between suramin and NF-Y and reveal a region of the protein, nearby the suramin-binding site and poorly conserved in other HFD-containing TFs, that may represent a promising starting point for rational design of more specific and potent inhibitors with potential therapeutic applications.
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Affiliation(s)
- Valentina Nardone
- Department of Biosciences, University of Milano, Via Celoria 26, 20133 Milano, Italy; (V.N.); (A.C.-S.); (M.L.); (A.S.); (D.D.); (C.C.); (A.B.); (N.G.); (R.M.)
| | - Antonio Chaves-Sanjuan
- Department of Biosciences, University of Milano, Via Celoria 26, 20133 Milano, Italy; (V.N.); (A.C.-S.); (M.L.); (A.S.); (D.D.); (C.C.); (A.B.); (N.G.); (R.M.)
| | - Michela Lapi
- Department of Biosciences, University of Milano, Via Celoria 26, 20133 Milano, Italy; (V.N.); (A.C.-S.); (M.L.); (A.S.); (D.D.); (C.C.); (A.B.); (N.G.); (R.M.)
| | - Cristina Airoldi
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, Piazza della Scienza 2, 20126 Milan, Italy;
| | - Andrea Saponaro
- Department of Biosciences, University of Milano, Via Celoria 26, 20133 Milano, Italy; (V.N.); (A.C.-S.); (M.L.); (A.S.); (D.D.); (C.C.); (A.B.); (N.G.); (R.M.)
| | - Sebastiano Pasqualato
- Department of Experimental Oncology, IEO, European Institute of Oncology IRCCS, Via Adamello 16, 20139 Milan, Italy;
| | - Diletta Dolfini
- Department of Biosciences, University of Milano, Via Celoria 26, 20133 Milano, Italy; (V.N.); (A.C.-S.); (M.L.); (A.S.); (D.D.); (C.C.); (A.B.); (N.G.); (R.M.)
| | - Carlo Camilloni
- Department of Biosciences, University of Milano, Via Celoria 26, 20133 Milano, Italy; (V.N.); (A.C.-S.); (M.L.); (A.S.); (D.D.); (C.C.); (A.B.); (N.G.); (R.M.)
| | - Andrea Bernardini
- Department of Biosciences, University of Milano, Via Celoria 26, 20133 Milano, Italy; (V.N.); (A.C.-S.); (M.L.); (A.S.); (D.D.); (C.C.); (A.B.); (N.G.); (R.M.)
| | - Nerina Gnesutta
- Department of Biosciences, University of Milano, Via Celoria 26, 20133 Milano, Italy; (V.N.); (A.C.-S.); (M.L.); (A.S.); (D.D.); (C.C.); (A.B.); (N.G.); (R.M.)
| | - Roberto Mantovani
- Department of Biosciences, University of Milano, Via Celoria 26, 20133 Milano, Italy; (V.N.); (A.C.-S.); (M.L.); (A.S.); (D.D.); (C.C.); (A.B.); (N.G.); (R.M.)
| | - Marco Nardini
- Department of Biosciences, University of Milano, Via Celoria 26, 20133 Milano, Italy; (V.N.); (A.C.-S.); (M.L.); (A.S.); (D.D.); (C.C.); (A.B.); (N.G.); (R.M.)
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3
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An XD, Yang S, Qiu B, Yang TT, Li XJ, Xiao J. Photoredox-Enabled Synthesis of β-Substituted Pyrroles from Pyrrolidines. J Org Chem 2020; 85:9558-9565. [PMID: 32567860 DOI: 10.1021/acs.joc.0c00459] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The merger of photoredox-initiated enamine-imine tautomerization and nucleophilic addition processes to access β-substituted pyrroles from pyrrolidines has been achieved. The significant advantage of this method is suppressing the Friedel-Crafts reaction, which usually occurs between N-aryl pyrrolidines and the highly electrophilic ketoesters. The good functional group tolerance, high atom economy, and high regioselectivity as well as easy handling conditions make it an appealing alternative to synthesize β-substituted pyrroles.
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Affiliation(s)
- Xiao-De An
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Shuo Yang
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Bin Qiu
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Ting-Ting Yang
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Xian-Jiang Li
- Shandong Kangqiao Biotechnology Co. Ltd., Binzhou 256500, China
| | - Jian Xiao
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China.,School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao 266109, China
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Liu B, Pett L, Kiakos K, Patil PC, Satam V, Hartley JA, Lee M, Wilson WD. DNA-Binding Properties of New Fluorescent AzaHx Amides: Methoxypyridylazabenzimidazolepyrroleimidazole/pyrrole. Chembiochem 2018; 19:1979-1987. [PMID: 29974647 DOI: 10.1002/cbic.201800273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2018] [Indexed: 11/11/2022]
Abstract
DNA minor groove binding polyamides have been extensively developed to control abnormal gene expression. The establishment of novel, inherently fluorescent 2-(p-anisyl)benzimidazole (Hx) amides has provided an alternative path for studying DNA binding in cells by direct observation of cell localization. Because of the 2:1 antiparallel stacking homodimer binding mode of these molecules to DNA, modification of Hx amides to 2-(p-anisyl)-4-azabenzimidazole (AzaHx) amides has successfully extended the DNA-recognition repertoire from central CG [recognized by Hx-I (I=N-methylimidazole)] to central GC [recognized by AzaHx-P (P=N-methylpyrrole)] recognition. For potential targeting of two consecutive GG bases, modification of the AzaHx moiety to 2- and 3-pyridyl-aza-benzimidazole (Pyr-AzaHx) moieties was explored. The newly designed molecules are also small-sized, fluorescent amides with the Pyr-AzaHx moiety connected to two conventional five-membered heterocycles. Complementary biophysical methods were performed to investigate the DNA-binding properties of these molecules. The results showed that neither 3-Pyr-AzaHx nor 2-Pyr-AzaHx was able to mimic I-I=N-methylimidazole-N-methylimidazole to target GG dinucleotides specifically. Rather, 3-Pyr-AzaHx was found to function like AzaHx, f-I (f=formamide), or P-I as an antiparallel stacked dimer. 3-Pyr-AzaHx-PI (2) binds 5'-ACGCGT'-3' with improved binding affinity and high sequence specificity in comparison to its parent molecule AzaHx-PI (1). However, 2-Pyr-AzaHx is detrimental to DNA binding because of an unfavorable steric clash upon stacking in the minor groove.
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Affiliation(s)
- Beibei Liu
- Department of Chemistry, Georgia State University, 50 Decatur Street SE, Atlanta, GA, 30303, USA
| | - Luke Pett
- Cancer Research (UK) Drug-DNA Interactions Research Group, UCL Cancer Institute, Gower Street, London, WC1E 6BT, UK
| | - Konstantinos Kiakos
- Cancer Research (UK) Drug-DNA Interactions Research Group, UCL Cancer Institute, Gower Street, London, WC1E 6BT, UK
| | - Pravin C Patil
- Department of Chemistry, Hope College, 141 E 12th Street, Holland, MI, 49423, USA
| | - Vijay Satam
- Department of Chemistry, Hope College, 141 E 12th Street, Holland, MI, 49423, USA
| | - John A Hartley
- Cancer Research (UK) Drug-DNA Interactions Research Group, UCL Cancer Institute, Gower Street, London, WC1E 6BT, UK
| | - Moses Lee
- Department of Chemistry, Georgia State University, 50 Decatur Street SE, Atlanta, GA, 30303, USA.,Department of Chemistry, Hope College, 141 E 12th Street, Holland, MI, 49423, USA.,Current address: M. J. Murdock Charitable Trust, 703 Broadway Street, Suite, 710, Vancouver, WA, 98660, USA
| | - W David Wilson
- Department of Chemistry, Georgia State University, 50 Decatur Street SE, Atlanta, GA, 30303, USA
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5
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Affiliation(s)
- Hasan Y. Alniss
- Department of Medicinal Chemistry, College of Pharmacy, University of Sharjah, P.O. Box 27272, Sharjah, United Arab Emirates
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Kawamoto Y, Bando T, Sugiyama H. Sequence-specific DNA binding Pyrrole-imidazole polyamides and their applications. Bioorg Med Chem 2018; 26:1393-1411. [PMID: 29439914 DOI: 10.1016/j.bmc.2018.01.026] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2017] [Revised: 01/25/2018] [Accepted: 01/28/2018] [Indexed: 12/25/2022]
Abstract
Pyrrole-imidazole polyamides (Py-Im polyamides) are cell-permeable compounds that bind to the minor groove of double-stranded DNA in a sequence-specific manner without causing denaturation of the DNA. These compounds can be used to control gene expression and to stain specific sequences in cells. Here, we review the history, structural variations, and functional investigations of Py-Im polyamides.
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Affiliation(s)
- Yusuke Kawamoto
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan
| | - Toshikazu Bando
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan.
| | - Hiroshi Sugiyama
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan; Institute for Integrated Cell-Material Science (iCeMS), Kyoto University, Sakyo, Kyoto 606-8501, Japan.
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7
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Pett L, Kiakos K, Satam V, Patil P, Laughlin-Toth S, Gregory M, Bowerman M, Olson K, Savagian M, Lee M, Lee M, Wilson WD, Hochhauser D, Hartley JA. Modulation of topoisomerase IIα expression and chemosensitivity through targeted inhibition of NF-Y:DNA binding by a diamino p-anisyl-benzimidazole (Hx) polyamide. BIOCHIMICA ET BIOPHYSICA ACTA. GENE REGULATORY MECHANISMS 2017; 1860:617-629. [PMID: 27750031 PMCID: PMC5757371 DOI: 10.1016/j.bbagrm.2016.10.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Revised: 10/11/2016] [Accepted: 10/12/2016] [Indexed: 11/21/2022]
Abstract
BACKGROUND Sequence specific polyamide HxIP 1, targeted to the inverted CCAAT Box 2 (ICB2) on the topoisomerase IIα (topo IIα) promoter can inhibit NF-Y binding, re-induce gene expression and increase sensitivity to etoposide. To enhance biological activity, diamino-containing derivatives (HxI*P 2 and HxIP* 3) were synthesised incorporating an alkyl amino group at the N1-heterocyclic position of the imidazole/pyrrole. METHODS DNase I footprinting was used to evaluate DNA binding of the diamino Hx-polyamides, and their ability to disrupt the NF-Y:ICB2 interaction assessed using EMSAs. Topo IIα mRNA (RT-PCR) and protein (Immunoblotting) levels were measured following 18h polyamide treatment of confluent A549 cells. γH2AX was used as a marker for etoposide-induced DNA damage after pre-treatment with HxIP* 3 and cell viability was measured using Cell-Titer Glo®. RESULTS Introduction of the N1-alkyl amino group reduced selectivity for the target sequence 5'-TACGAT-3' on the topo IIα promoter, but increased DNA binding affinity. Confocal microscopy revealed both fluorescent diamino polyamides localised in the nucleus, yet HxI*P 2 was unable to disrupt the NF-Y:ICB2 interaction and showed no effect against the downregulation of topo IIα. In contrast, inhibition of NF-Y binding by HxIP* 3 stimulated dose-dependent (0.1-2μM) re-induction of topo IIα and potentiated cytotoxicity of topo II poisons by enhancing DNA damage. CONCLUSIONS Polyamide functionalisation at the N1-position offers a design strategy to improve drug-like properties. Dicationic HxIP* 3 increased topo IIα expression and chemosensitivity to topo II-targeting agents. GENERAL SIGNIFICANCE Pharmacological modulation of topo IIα expression has the potential to enhance cellular sensitivity to clinically-used anticancer therapeutics. This article is part of a Special Issue entitled: Nuclear Factor Y in Development and Disease, edited by Prof. Roberto Mantovani.
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Affiliation(s)
- Luke Pett
- Cancer Research UK Drug-DNA Interactions Research Group, UCL Cancer Institute, London, WC1E 6BT, UK
| | - Konstantinos Kiakos
- Cancer Research UK Drug-DNA Interactions Research Group, UCL Cancer Institute, London, WC1E 6BT, UK
| | - Vijay Satam
- Department of Chemistry, Hope College, Holland, MI 49423, United States
| | - Pravin Patil
- Department of Chemistry, Hope College, Holland, MI 49423, United States
| | - Sarah Laughlin-Toth
- Department of Chemistry, Georgia State University, Atlanta, GA 30303, United States
| | - Matthew Gregory
- Department of Chemistry, Hope College, Holland, MI 49423, United States
| | - Michael Bowerman
- Department of Chemistry, Hope College, Holland, MI 49423, United States
| | - Kevin Olson
- Department of Chemistry, Hope College, Holland, MI 49423, United States
| | - Mia Savagian
- Department of Chemistry, Hope College, Holland, MI 49423, United States
| | - Megan Lee
- Department of Chemistry, Hope College, Holland, MI 49423, United States
| | - Moses Lee
- Department of Chemistry, Hope College, Holland, MI 49423, United States; Department of Chemistry, Georgia State University, Atlanta, GA 30303, United States
| | - W David Wilson
- Department of Chemistry, Georgia State University, Atlanta, GA 30303, United States
| | - Daniel Hochhauser
- Cancer Research UK Drug-DNA Interactions Research Group, UCL Cancer Institute, London, WC1E 6BT, UK
| | - John A Hartley
- Cancer Research UK Drug-DNA Interactions Research Group, UCL Cancer Institute, London, WC1E 6BT, UK.
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8
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Zhou H, Chen D, Bai JK, Sun XL, Li C, Qiao RZ. Effect of ligand sequence-specific modification on DNA hybrid catalysis. Org Biomol Chem 2017; 15:6738-6745. [DOI: 10.1039/c7ob01249g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report a sequence-specific catalytic ligand as a chemical modification strategy to achieve DNA-based asymmetric reactions with sequence-dependent enantioselectivity.
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Affiliation(s)
- H. Zhou
- State Key Laboratory of Chemical Resource Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - D. Chen
- State Key Laboratory of Chemical Resource Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - J. K. Bai
- State Key Laboratory of Chemical Resource Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - X. L. Sun
- State Key Laboratory of Chemical Resource Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - C. Li
- State Key Laboratory of Chemical Resource Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - R. Z. Qiao
- State Key Laboratory of Chemical Resource Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
- State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical Sciences
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9
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Gurtner A, Manni I, Piaggio G. NF-Y in cancer: Impact on cell transformation of a gene essential for proliferation. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2016; 1860:604-616. [PMID: 27939755 DOI: 10.1016/j.bbagrm.2016.12.005] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Revised: 11/30/2016] [Accepted: 12/05/2016] [Indexed: 12/17/2022]
Abstract
NF-Y is a ubiquitous heterotrimeric transcription factor with a binding affinity for the CCAAT consensus motif, one of the most common cis-acting element in the promoter and enhancer regions of eukaryote genes in direct (CCAAT) or reverse (ATTGG) orientation. NF-Y consists of three subunits, NF-YA, the regulatory subunit of the trimer, NF-YB, and NF-YC, all required for CCAAT binding. Growing evidence in cells and animal models support the notion that NF-Y, driving transcription of a plethora of cell cycle regulatory genes, is a key player in the regulation of proliferation. Proper control of cellular growth is critical for cancer prevention and uncontrolled proliferation is a hallmark of cancer cells. Indeed, during cell transformation aberrant molecular pathways disrupt mechanisms controlling proliferation and many growth regulatory genes are altered in tumors. Here, we review bioinformatics, molecular and functional evidence indicating the involvement of the cell cycle regulator NF-Y in cancer-associated pathways. This article is part of a Special Issue entitled: Nuclear Factor Y in Development and Disease, edited by Prof. Roberto Mantovani.
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Affiliation(s)
- Aymone Gurtner
- Department of Research, Advanced Diagnostics and Technological Innovation, UOSD SAFU, Regina Elena National Cancer Institute, Via Elio Chianesi 53, 00144, Rome, Italy
| | - Isabella Manni
- Department of Research, Advanced Diagnostics and Technological Innovation, UOSD SAFU, Regina Elena National Cancer Institute, Via Elio Chianesi 53, 00144, Rome, Italy
| | - Giulia Piaggio
- Department of Research, Advanced Diagnostics and Technological Innovation, UOSD SAFU, Regina Elena National Cancer Institute, Via Elio Chianesi 53, 00144, Rome, Italy.
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10
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Kiakos K, Pett L, Satam V, Patil P, Hochhauser D, Lee M, Hartley JA. Nuclear Localization and Gene Expression Modulation by a Fluorescent Sequence-Selective p-Anisyl-benzimidazolecarboxamido Imidazole-Pyrrole Polyamide. CHEMISTRY & BIOLOGY 2015; 22:862-75. [PMID: 26119998 DOI: 10.1016/j.chembiol.2015.06.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Revised: 05/20/2015] [Accepted: 06/02/2015] [Indexed: 01/03/2023]
Abstract
Synthetic pyrrole (P)-imidazole (I) containing polyamides can target predetermined DNA sequences and modulate gene expression by interfering with transcription factor binding. We have previously shown that rationally designed polyamides targeting the inverted CCAAT box 2 (ICB2) of the topoisomerase IIα (topo IIα) promoter can inhibit binding of transcription factor NF-Y, re-inducing expression of the enzyme in confluent cells. Here, the A/T recognizing fluorophore, p-anisylbenzimidazolecarboxamido (Hx) was incorporated into the hybrid polyamide HxIP, which fluoresces upon binding to DNA, providing an intrinsic probe to monitor cellular uptake. HxIP targets the 5'-TACGAT-3' sequence of the 5' flank of ICB2 with high affinity and sequence specificity, eliciting an ICB2-selective inhibition/displacement of NF-Y. HxIP is readily taken up by NIH3T3 and A549 cells, and detected in the nucleus within minutes. Exposure to the polyamide at confluence resulted in a dose-dependent upregulation of topo IIα expression and enhanced formation of etoposide-induced DNA strand breaks.
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Affiliation(s)
- Konstantinos Kiakos
- Cancer Research UK Drug-DNA Interactions Research Group, UCL Cancer Institute, Paul O'Gorman Building, 72 Huntley Street, London WC1E 6BT, UK
| | - Luke Pett
- Cancer Research UK Drug-DNA Interactions Research Group, UCL Cancer Institute, Paul O'Gorman Building, 72 Huntley Street, London WC1E 6BT, UK
| | - Vijay Satam
- Division of Natural & Applied Sciences and Department of Chemistry, Hope College, 35 East, 12(th) Street, Holland, MI 49423, USA
| | - Pravin Patil
- Division of Natural & Applied Sciences and Department of Chemistry, Hope College, 35 East, 12(th) Street, Holland, MI 49423, USA
| | - Daniel Hochhauser
- Cancer Research UK Drug-DNA Interactions Research Group, UCL Cancer Institute, Paul O'Gorman Building, 72 Huntley Street, London WC1E 6BT, UK
| | - Moses Lee
- Division of Natural & Applied Sciences and Department of Chemistry, Hope College, 35 East, 12(th) Street, Holland, MI 49423, USA
| | - John A Hartley
- Cancer Research UK Drug-DNA Interactions Research Group, UCL Cancer Institute, Paul O'Gorman Building, 72 Huntley Street, London WC1E 6BT, UK.
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11
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Chavda S, Babu B, Patil P, Plaunt A, Ferguson A, Lee M, Tzou S, Sjoholm R, Rice T, Mackay H, Ramos J, Wang S, Lin S, Kiakos K, Wilson WD, Hartley JA, Lee M. Design, synthesis, and DNA binding characteristics of a group of orthogonally positioned diamino, N-formamido, pyrrole- and imidazole-containing polyamides. Bioorg Med Chem 2013; 21:3907-18. [PMID: 23647824 DOI: 10.1016/j.bmc.2013.04.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Revised: 03/26/2013] [Accepted: 04/02/2013] [Indexed: 02/08/2023]
Abstract
Orthogonally positioned diamino/dicationic polyamides (PAs) have good water solubility and enhanced binding affinity, whilst retaining DNA minor groove and sequence specificity compared to their monoamino/monocationic counterparts. The synthesis and DNA binding properties of the following diamino PAs: f-IPI (3a), f-IPP (4), f-PIP (5), and f-PPP (6) are described. P denotes the site where a 1-propylamino group is attached to the N1-position of the heterocycle. Binding of the diamino PAs to DNA was assessed by DNase I footprinting, thermal denaturation, circular dichroism titration, biosensor surface plasmon resonance (SPR), and isothermal titration calorimetry (ITC) studies. According to SPR studies, f-IPI (3a) bound more strongly (K(eq)=2.4×10(8) M(-1)) and with comparable sequence selectivity to its cognate sequence 5'-ACGCGT-3' when compared to its monoamino analog f-IPI (1). The binding of f-IPI (3a) to 5'-ACGCGT-3' via the stacked dimer motif was balanced between enthalpy and entropy, and that was quite different from the enthalpy-driven binding of its monoamino parent f-IPI (1). f-IPP (4) also bound more strongly to its cognate sequence 5'-ATGCAT-3' (K(eq)=7.4×10(6) M(-1)) via the side-by-side stacked motif than its monoamino analog f-IPP (2a). Although f-PPP (6) bound via a 1:1 motif, it bound strongly to its cognate sequence 5'-AAATTT-3' (K(eq)=4.8×10(7) M(-1)), 15-times higher than the binding of its monoamino analog f-PPP (2c), albeit f-PPP bound via the stacked motif. Finally, f-PIP (5) bound to its target sequence 5'-ATCGAT-3' as a stacked dimer and it has the lowest affinity among the diamino PAs tested (Keq <1×10(5) M(-1)). This was about two times lower in affinity than the binding of its monoamino analog f-PIP (2b). The results further demonstrated that the 'core rules' of DNA recognition by monoamino PAs also apply to their diamino analogs. Specifically, PAs that contain a stacked IP core structure bind most strongly (highest binding constants) to their cognate GC doublet, followed by the binding of PAs with a stacked PP structure to two degenerate AT base pairs, and finally the binding of PAs with a PI core to their cognate CG doublet.
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Affiliation(s)
- Sameer Chavda
- Division of Natural and Applied Sciences and Department of Chemistry, Hope College, Holland, MI 49423, USA
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12
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Zhang L, Peng XM, Damu GLV, Geng RX, Zhou CH. Comprehensive review in current developments of imidazole-based medicinal chemistry. Med Res Rev 2013; 34:340-437. [PMID: 23740514 DOI: 10.1002/med.21290] [Citation(s) in RCA: 482] [Impact Index Per Article: 43.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Imidazole ring is an important five-membered aromatic heterocycle widely present in natural products and synthetic molecules. The unique structural feature of imidazole ring with desirable electron-rich characteristic is beneficial for imidazole derivatives to readily bind with a variety of enzymes and receptors in biological systems through diverse weak interactions, thereby exhibiting broad bioactivities. The related research and developments of imidazole-based medicinal chemistry have become a rapidly developing and increasingly active topic. Particularly, numerous imidazole-based compounds as clinical drugs have been extensively used in the clinic to treat various types of diseases with high therapeutic potency, which have shown the enormous development value. This work systematically gives a comprehensive review in current developments of imidazole-based compounds in the whole range of medicinal chemistry as anticancer, antifungal, antibacterial, antitubercular, anti-inflammatory, antineuropathic, antihypertensive, antihistaminic, antiparasitic, antiobesity, antiviral, and other medicinal agents, together with their potential applications in diagnostics and pathology. It is hoped that this review will be helpful for new thoughts in the quest for rational designs of more active and less toxic imidazole-based medicinal drugs, as well as more effective diagnostic agents and pathologic probes.
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Affiliation(s)
- Ling Zhang
- Laboratory of Bioorganic & Medicinal Chemistry, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, People's Republic of China
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Nanjunda R, Wilson WD. Binding to the DNA minor groove by heterocyclic dications: from AT-specific monomers to GC recognition with dimers. ACTA ACUST UNITED AC 2013; Chapter 8:Unit8.8. [PMID: 23255206 DOI: 10.1002/0471142700.nc0808s51] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Compounds that bind in the DNA minor groove have provided critical information on DNA molecular recognition, have found extensive uses in biotechnology, and are providing clinically useful drugs against diseases as diverse as cancer and sleeping sickness. This review focuses on the development of clinically useful heterocyclic diamidine minor groove binders. These compounds have shown us that the classical model for minor groove binding in AT DNA sequences must be expanded in several ways: compounds with nonstandard shapes can bind strongly to the groove, water can be directly incorporated into the minor groove complex in an interfacial interaction, and the compounds can form cooperative stacked dimers to recognize GC and mixed AT/GC base pair sequences.
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Affiliation(s)
- Rupesh Nanjunda
- Department of Chemistry, Georgia State University, Atlanta, Georgia, USA
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Barrett MP, Gemmell CG, Suckling CJ. Minor groove binders as anti-infective agents. Pharmacol Ther 2013; 139:12-23. [PMID: 23507040 DOI: 10.1016/j.pharmthera.2013.03.002] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2013] [Accepted: 01/22/2013] [Indexed: 12/29/2022]
Abstract
Minor groove binders are small molecules that form strong complexes with the minor groove of DNA. There are several structural types of which distamycin and netropsin analogues, oligoamides built from heterocyclic and aromatic amino acids, and bis-amidines separated by aromatic and heterocyclic rings are of particular pharmaceutical interest. These molecules have helical topology that approximately matches the curvature of DNA in the minor groove. Depending upon the precise structure of the minor groove binder, selectivity can be obtained with respect to the DNA base sequence to which the compound binds. Minor groove binders have found substantial applications in anti-cancer therapy but their significance in anti-infective therapy has also been significant and is growing. For example, compounds of the bis-amidine class have been notable contributors to antiparasitic therapy for many years with examples such as berenil and pentamidine being well-known. A recent growth area has been inreased sophistication in the oligoamide class. High sequence selectivity is now possible and compounds with distinct antibacterial, antifungal, antiviral, and antiparasitic activity have all been identified. Importantly, the structures of the most active compounds attacking the various infective organisms differ significantly but not necessarily predictively. This poses interesting questions of mechanism of action with many different targets involved in DNA processing being candidates. Access of compounds to specific cell types also plays a role and in some cases, can be decisive. Prospects for a range of selective therapeutic agents from this class of compounds are higher now than for some considerable time.
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Affiliation(s)
- Michael P Barrett
- Wellcome Trust Centre for Molecular Parasitology, Institute of Infection, Immunity and Inflammation, College of Medical, Veterinary and Life Sciences, Sir Graeme Davies Building University of Glasgow, 120 University Place, Glasgow, G12 8TA, Scotland, United Kingdom.
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15
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Wang S, Nanjunda R, Aston K, Bashkin JK, Wilson WD. Correlation of local effects of DNA sequence and position of β-alanine inserts with polyamide-DNA complex binding affinities and kinetics. Biochemistry 2012; 51:9796-806. [PMID: 23167504 DOI: 10.1021/bi301327v] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
To improve our understanding of the effects of β-alanine (β) substitution and the number of heterocycles on DNA binding affinity and selectivity, we investigated the interactions of an eight-ring hairpin polyamide (PA) and two β derivatives as well as a six-heterocycle analogue with their cognate DNA sequence, 5'-TGGCTT-3'. Binding selectivity and the effects of β have been investigated with the cognate and five mutant DNAs. A set of powerful and complementary methods have been employed for both energetic and structural evaluations: UV melting, biosensor surface plasmon resonance, isothermal titration calorimetry, circular dichroism, and a DNA ligation ladder global structure assay. The reduced number of heterocycles in the six-ring PA weakens the binding affinity; however, the smaller PA aggregates significantly less than the larger PAs and allows us to obtain the binding thermodynamics. The PA-DNA binding enthalpy is large and negative with a large negative ΔC(p) and is the primary driving component of the Gibbs free energy. The complete SPR binding results clearly show that β substitutions can substantially weaken the binding affinity of hairpin PAs in a position-dependent manner. More importantly, the changes in the binding of PA to the mutant DNAs further confirm the position-dependent effects on the PA-DNA interaction affinity. Comparison of mutant DNA sequences also shows a different effect in recognition of T·A versus A·T base pairs. The effects of DNA mutations on binding of a single PA as well as the effects of the position of β substitution on binding tell a clear and very important story about sequence-dependent binding of PAs to DNA.
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Affiliation(s)
- Shuo Wang
- Department of Chemistry, Georgia State University, Atlanta, GA 30303, USA
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16
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Rettig M, Germann MW, Ismail MA, Batista-Parra A, Munde M, Boykin DW, Wilson WD. Microscopic rearrangement of bound minor groove binders detected by NMR. J Phys Chem B 2012; 116:5620-7. [PMID: 22530735 DOI: 10.1021/jp301143e] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Thermodynamic and structural studies are commonly utilized to optimize small molecules for specific DNA interactions, and, thus, a significant amount of binding data is available. However, the dynamic processes that are involved in minor groove complex formation and maintenance are not fully understood. To help define the processes involved, we have conducted 1D and 2D NMR in conjunction with biosensor-SPR experiments with a variety of compounds and symmetric, as well as asymmetric, AT tract DNA sequences. Surprisingly, the NMR data clearly show exchange between equivalent binding sites for strongly binding compounds like netropsin and DB921 (Ka > 10(8) M(-1)) that does not involve dissociation off the DNA. A quantitative analysis of the data revealed that these bound exchange rates are indeed much faster than the macroscopic dissociation rates which were independently determined by biosensor-SPR. Additionally, we could show the existence of at least two 1:1 compound DNA complexes at the same site for the interaction of these compounds with an asymmetric DNA sequence. To explain this behavior we introduced a model in which the ligand is rapidly flipping between two orientations while in close association with the DNA. The ligand reorientation will contribute favorably to the binding entropy. As the potential of minor groove binders to form more than a single complex with asymmetric, as well as symmetric, duplexes is widely unknown, the consequences for binding thermodynamics and compound design are discussed.
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Affiliation(s)
- Michael Rettig
- Department of Chemistry, Georgia State University , Atlanta, Georgia 30303, United States
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17
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From multiply active natural product to candidate drug? Antibacterial (and other) minor groove binders for DNA. Future Med Chem 2012; 4:971-89. [DOI: 10.4155/fmc.12.52] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Natural products that bind to DNA in the minor groove are valuable templates for drug design. Examples include distamycin, netropsin, duocarmycin and anthramycin. Anticancer and anti-infective drugs feature strongly amongst their derivatives. The structures and activities of chemotypes with various therapeutic actions are discussed in the context of the broader field of therapeutically active minor groove binders. The evolution of a series of exceptionally potent and nontoxic antibacterial compounds is discussed using the general design principle of introducing additional hydrophobicity into the distamycin template to increase the strength of binding to DNA. As well as potent antibacterial compounds, antifungal and antiparasitic compounds with exceptional cellular activity against trypanosomes have been identified. Possible mechanisms of action including gene regulation and topoisomerase inhibition are discussed with the need in mind to understand selective toxicity in the series to support future drug discovery.
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18
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Ghai R, Falconer RJ, Collins BM. Applications of isothermal titration calorimetry in pure and applied research--survey of the literature from 2010. J Mol Recognit 2012; 25:32-52. [PMID: 22213449 DOI: 10.1002/jmr.1167] [Citation(s) in RCA: 117] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Isothermal titration calorimetry (ITC) is a biophysical technique for measuring the formation and dissociation of molecular complexes and has become an invaluable tool in many branches of science from cell biology to food chemistry. By measuring the heat absorbed or released during bond formation, ITC provides accurate, rapid, and label-free measurement of the thermodynamics of molecular interactions. In this review, we survey the recent literature reporting the use of ITC and have highlighted a number of interesting studies that provide a flavour of the diverse systems to which ITC can be applied. These include measurements of protein-protein and protein-membrane interactions required for macromolecular assembly, analysis of enzyme kinetics, experimental validation of molecular dynamics simulations, and even in manufacturing applications such as food science. Some highlights include studies of the biological complex formed by Staphylococcus aureus enterotoxin C3 and the murine T-cell receptor, the mechanism of membrane association of the Parkinson's disease-associated protein α-synuclein, and the role of non-specific tannin-protein interactions in the quality of different beverages. Recent developments in automation are overcoming limitations on throughput imposed by previous manual procedures and promise to greatly extend usefulness of ITC in the future. We also attempt to impart some practical advice for getting the most out of ITC data for those researchers less familiar with the method.
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Affiliation(s)
- Rajesh Ghai
- Institute for Molecular Bioscience (IMB), University of Queensland, St. Lucia, Queensland, 4072, Australia
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Liu Y, Chai Y, Kumar A, Tidwell RR, Boykin DW, Wilson WD. Designed compounds for recognition of 10 base pairs of DNA with two at binding sites. J Am Chem Soc 2012; 134:5290-9. [PMID: 22369366 DOI: 10.1021/ja211628j] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Short AT base pair sequences that are separated by a small number of GCs are common in eukaryotic parasite genomes. Cell-permeable compounds that bind effectively and selectively to such sequences present an attractive therapeutic approach. Compounds with linked, one or two amidine-benzimidazole-phenyl (ABP) motifs were designed, synthesized, and evaluated for binding to adjacent AT sites by biosensor-surface plasmon resonance (SPR). A surprising feature of the linked ABP motifs is that a set of six similar compounds has three different minor groove binding modes with the target sequences. Compounds with one ABP bind independently to two separated AT sites. Unexpectedly, compounds with two ABP motifs can bind strongly either as monomers or as cooperative dimers to the full site. The results are supported by mass spectrometry and circular dichroism, and models to explain the different binding modes are presented.
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Affiliation(s)
- Yang Liu
- Department of Chemistry, Georgia State University, Atlanta, Georgia 30302-4098, United States
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20
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Dolfini D, Gatta R, Mantovani R. NF-Y and the transcriptional activation of CCAAT promoters. Crit Rev Biochem Mol Biol 2011; 47:29-49. [PMID: 22050321 DOI: 10.3109/10409238.2011.628970] [Citation(s) in RCA: 171] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The CCAAT box promoter element and NF-Y, the transcription factor (TF) that binds to it, were among the first cis-elements and trans-acting factors identified; their interplay is required for transcriptional activation of a sizeable number of eukaryotic genes. NF-Y consists of three evolutionarily conserved subunits: a dimer of NF-YB and NF-YC which closely resembles a histone, and the "innovative" NF-YA. In this review, we will provide an update on the functional and biological features that make NF-Y a fundamental link between chromatin and transcription. The last 25 years have witnessed a spectacular increase in our knowledge of how genes are regulated: from the identification of cis-acting sequences in promoters and enhancers, and the biochemical characterization of the corresponding TFs, to the merging of chromatin studies with the investigation of enzymatic machines that regulate epigenetic states. Originally identified and studied in yeast and mammals, NF-Y - also termed CBF and CP1 - is composed of three subunits, NF-YA, NF-YB and NF-YC. The complex recognizes the CCAAT pentanucleotide and specific flanking nucleotides with high specificity (Dorn et al., 1997; Hatamochi et al., 1988; Hooft van Huijsduijnen et al, 1987; Kim & Sheffery, 1990). A compelling set of bioinformatics studies clarified that the NF-Y preferred binding site is one of the most frequent promoter elements (Suzuki et al., 2001, 2004; Elkon et al., 2003; Mariño-Ramírez et al., 2004; FitzGerald et al., 2004; Linhart et al., 2005; Zhu et al., 2005; Lee et al., 2007; Abnizova et al., 2007; Grskovic et al., 2007; Halperin et al., 2009; Häkkinen et al., 2011). The same consensus, as determined by mutagenesis and SELEX studies (Bi et al., 1997), was also retrieved in ChIP-on-chip analysis (Testa et al., 2005; Ceribelli et al., 2006; Ceribelli et al., 2008; Reed et al., 2008). Additional structural features of the CCAAT box - position, orientation, presence of multiple Transcriptional Start Sites - were previously reviewed (Dolfini et al., 2009) and will not be considered in detail here.
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Affiliation(s)
- Diletta Dolfini
- Dipartimento di Scienze Biomolecolari e Biotecnologie, Università degli Studi di Milano, Milan, Italy
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Martinelli F, Palmieri A, Petrini M. Regioselective Synthesis of 3‐Substituted Pyrroles by Nucleophilic Addition of 3‐(1‐Arylsulfonylalkyl) Pyrroles Activated under Basic or Acid Conditions. Chemistry 2011; 17:7183-7. [DOI: 10.1002/chem.201100434] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2011] [Indexed: 12/21/2022]
Affiliation(s)
- Fabio Martinelli
- School of Science and Technology, Chemistry Division, Università di Camerino, Via S. Agostino, 1, 62032 Camerino (Italy), Fax: (+39) 0737‐402297
| | - Alessandro Palmieri
- School of Science and Technology, Chemistry Division, Università di Camerino, Via S. Agostino, 1, 62032 Camerino (Italy), Fax: (+39) 0737‐402297
| | - Marino Petrini
- School of Science and Technology, Chemistry Division, Università di Camerino, Via S. Agostino, 1, 62032 Camerino (Italy), Fax: (+39) 0737‐402297
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