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Ismatullah H, Jabeen I, Kiani YS. Structural and functional insight into a new emerging target IP 3R in cancer. J Biomol Struct Dyn 2024; 42:2170-2196. [PMID: 37070253 DOI: 10.1080/07391102.2023.2201332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Accepted: 04/05/2023] [Indexed: 04/19/2023]
Abstract
Calcium signaling has been identified as an important phenomenon in a plethora of cellular processes. Inositol 1,4,5-trisphosphate receptors (IP3Rs) are ER-residing intracellular calcium (Ca2+) release channels responsible for cell bioenergetics by transferring calcium from the ER to the mitochondria. The recent availability of full-length IP3R channel structure has enabled the researchers to design the IP3 competitive ligands and reveal the channel gating mechanism by elucidating the conformational changes induced by ligands. However, limited knowledge is available for IP3R antagonists and the exact mechanism of action of these antagonists within a tumorigenic environment of a cell. Here in this review a summarized information about the role of IP3R in cell proliferation and apoptosis has been discussed. Moreover, structure and gating mechanism of IP3R in the presence of antagonists have been provided in this review. Additionally, compelling information about ligand-based studies (both agonists and antagonists) has been discussed. The shortcomings of these studies and the challenges toward the design of potent IP3R modulators have also been provided in this review. However, the conformational changes induced by antagonists for channel gating mechanism still display some major drawbacks that need to be addressed. However, the design, synthesis and availability of isoform-specific antagonists is a rather challenging one due to intra-structural similarity within the binding domain of each isoform. HighlightsThe intricate complexity of IP3R's in cellular processes declares them an important target whereby, the recently solved structure depicts the receptor's potential involvement in a complex network of processes spanning from cell proliferation to cell death.Pharmacological inhibition of IP3R attenuates the proliferation or invasiveness of cancers, thus inducing necrotic cell death.Despite significant advancements, there is a tremendous need to design new potential hits to target IP3R, based upon 3D structural features and pharmacophoric patterns.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Humaira Ismatullah
- Department of Sciences, School of Interdisciplinary Engineering and Sciences (SINES), National University of Sciences and Technology (NUST), Islamabad, Pakistan
| | - Ishrat Jabeen
- Department of Sciences, School of Interdisciplinary Engineering and Sciences (SINES), National University of Sciences and Technology (NUST), Islamabad, Pakistan
| | - Yusra Sajid Kiani
- Department of Sciences, School of Interdisciplinary Engineering and Sciences (SINES), National University of Sciences and Technology (NUST), Islamabad, Pakistan
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Gambardella J, Morelli MB, Wang X, Castellanos V, Mone P, Santulli G. The discovery and development of IP3 receptor modulators: an update. Expert Opin Drug Discov 2021; 16:709-718. [PMID: 33356639 DOI: 10.1080/17460441.2021.1858792] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Introduction: Inositol 1,4,5-trisphosphate receptors (IP3Rs) are intracellular calcium (Ca2+) release channels located on the endoplasmic/sarcoplasmic reticulum. The availability of the structure of the ligand-binding domain of IP3Rs has enabled the design of compatible ligands, but the limiting step remains their actual effectiveness in a biological context.Areas covered: This article summarizes the compelling literature on both agonists and antagonists targeting IP3Rs, emphasizing their strengths and limitations. The main challenges toward the discovery and development of IP3 receptor modulators are also described.Expert opinion: Despite significant progress in recent years, the pharmacology of IP3R still has major drawbacks, especially concerning the availability of specific antag onists. Moreover, drugs specifically targeting the three different subtypes of IP3R are especially needed.
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Affiliation(s)
- Jessica Gambardella
- Department of Medicine (Division of Cardiology), Wilf Family Cardiovascular Research Institute, Einstein Institute for Aging Research, Albert Einstein College of Medicine, Montefiore University Hospital, New York City, USA.,Department of Molecular Pharmacology, Fleischer Institute for Diabetes and Metabolism, Einstein-Sinai Diabetes Research Center (ES-DRC), Albert Einstein College of Medicine, New York City, USA.,Department of Advanced Biomedical Sciences, "Federico II" University, Naples, Italy.,International Translational Research and Medical Education (ITME), Naples, Italy
| | - Marco B Morelli
- Department of Medicine (Division of Cardiology), Wilf Family Cardiovascular Research Institute, Einstein Institute for Aging Research, Albert Einstein College of Medicine, Montefiore University Hospital, New York City, USA.,Department of Molecular Pharmacology, Fleischer Institute for Diabetes and Metabolism, Einstein-Sinai Diabetes Research Center (ES-DRC), Albert Einstein College of Medicine, New York City, USA
| | - Xujun Wang
- Department of Medicine (Division of Cardiology), Wilf Family Cardiovascular Research Institute, Einstein Institute for Aging Research, Albert Einstein College of Medicine, Montefiore University Hospital, New York City, USA
| | - Vanessa Castellanos
- Department of Medicine (Division of Cardiology), Wilf Family Cardiovascular Research Institute, Einstein Institute for Aging Research, Albert Einstein College of Medicine, Montefiore University Hospital, New York City, USA
| | - Pasquale Mone
- University of Campania "Luigi Vanvitelli", Naples, Italy
| | - Gaetano Santulli
- Department of Medicine (Division of Cardiology), Wilf Family Cardiovascular Research Institute, Einstein Institute for Aging Research, Albert Einstein College of Medicine, Montefiore University Hospital, New York City, USA.,Department of Molecular Pharmacology, Fleischer Institute for Diabetes and Metabolism, Einstein-Sinai Diabetes Research Center (ES-DRC), Albert Einstein College of Medicine, New York City, USA.,Department of Advanced Biomedical Sciences, "Federico II" University, Naples, Italy.,International Translational Research and Medical Education (ITME), Naples, Italy
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Lin J, Zhao C, Liu C, Fu S, Han L, Lu X, Yang C. Redox-responsive F127-folate/F127-disulfide bond-d-α-tocopheryl polyethylene glycol 1000 succinate/P123 mixed micelles loaded with paclitaxel for the reversal of multidrug resistance in tumors. Int J Nanomedicine 2018; 13:805-830. [PMID: 29445276 PMCID: PMC5808690 DOI: 10.2147/ijn.s152395] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Introduction The development of nanodrug carriers utilizing tumor microenvironment has become a hotspot in reversing multidrug resistance (MDR). Materials and methods This study synthesized a redox-sensitive copolymer, Pluronic F127-disulfide bond-d-α-tocopheryl polyethylene glycol 1000 succinate (FSST), through the connection of the reduction-sensitive disulfide bond between F127 and d-α-tocopheryl polyethylene glycol 1000 succinate. This polymer could induce the elevation of reactive oxygen species (ROS) levels, ultimately resulting in cytotoxicity. Moreover, the redox-responsive mixed micelles, F127-folate (FA)/FSST/P123 (FFSSTP), based on FSST, Pluronic F127-FA, and Pluronic P123, were prepared to load paclitaxel (PTX). Results The in vitro release study demonstrated that FFSSTP/PTX accelerated the PTX release through the breakage of disulfide bond in reductive environment. In cellular experiment, FFSSTP/PTX induced significant apoptosis in PTX-resistant MCF-7/PTX cells through inhibiting adenosine triphosphate (ATP)-binding cassette proteins from pumping out PTX by interfering with the mitochondrial function and ATP synthesis. Furthermore, FFSSTP/PTX induced apoptosis through elevating the intracellular levels of ROS. Conclusion FFSSTP could become a potential carrier for the treatment of MDR tumors.
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Affiliation(s)
- Jing Lin
- College of Pharmacy, Jiamusi University, Jiamusi, Heilongjiang, China
| | - Chaoyue Zhao
- College of Pharmacy, Jiamusi University, Jiamusi, Heilongjiang, China
| | - Cuijuan Liu
- College of Pharmacy, Jiamusi University, Jiamusi, Heilongjiang, China
| | - Shiyao Fu
- College of Pharmacy, Jiamusi University, Jiamusi, Heilongjiang, China
| | - Luying Han
- College of Pharmacy, Jiamusi University, Jiamusi, Heilongjiang, China
| | - Xinping Lu
- College of Pharmacy, Jiamusi University, Jiamusi, Heilongjiang, China
| | - Chunrong Yang
- College of Pharmacy, Jiamusi University, Jiamusi, Heilongjiang, China
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Dong K, Yang C, Yan Y, Wang P, Sun Y, Wang K, Lu T, Chen Q, Zhang Y, Xing J, Dong Y. Investigation of the intracellular oxidative stress amplification, safety and anti-tumor effect of a kind of novel redox-responsive micelle. J Mater Chem B 2018; 6:1105-1117. [DOI: 10.1039/c7tb02973j] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Redox-responsive FSST micelles with good biocompatibility can increase ROS levels in tumor cells and amplify oxidative stress, ultimately inducing apoptosis.
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Vibhute AM, Pushpanandan P, Varghese M, Koniecnzy V, Taylor CW, Sureshan KM. Synthesis of dimeric analogs of adenophostin A that potently evoke Ca 2+ release through IP 3 receptors. RSC Adv 2016; 6:86346-86351. [PMID: 28066549 PMCID: PMC5171214 DOI: 10.1039/c6ra19413c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Accepted: 09/05/2016] [Indexed: 11/21/2022] Open
Abstract
Syntheses and Ca2+ release potentials of four dimeric analogs of adenophostin A (AdA) through activation of type 1 IP3R are reported. These analogs are full agonists of IP3R and are equipotent to AdA, the most potent agonist of IP3R.
Inositol 1,4,5-trisphosphate receptors (IP3Rs) are tetrameric intracellular channels through which many extracellular stimuli initiate the Ca2+ signals that regulate diverse cellular responses. There is considerable interest in developing novel ligands of IP3R. Adenophostin A (AdA) is a potent agonist of IP3R and since some dimeric analogs of IP3R ligands are more potent than the corresponding monomer; we considered whether dimeric AdA analogs might provide agonists with increased potency. We previously synthesized traizolophostin, in which a simple triazole replaced the adenine of AdA, and showed it to be equipotent to AdA. Here, we used click chemistry to synthesize four homodimeric analogs of triazolophostin, connected by oligoethylene glycol chains of different lengths. We evaluated the potency of these analogs to release Ca2+ through type 1 IP3R and established that the newly synthesized dimers are equipotent to AdA and triazolophostin.
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Affiliation(s)
- Amol M Vibhute
- School of Chemistry , Indian Institute of Science Education and Research Thiruvananthapuram , Kerala 695016 , India . ; http://kms514.wix.com/kmsgroup
| | - Poornenth Pushpanandan
- School of Chemistry , Indian Institute of Science Education and Research Thiruvananthapuram , Kerala 695016 , India . ; http://kms514.wix.com/kmsgroup
| | - Maria Varghese
- School of Chemistry , Indian Institute of Science Education and Research Thiruvananthapuram , Kerala 695016 , India . ; http://kms514.wix.com/kmsgroup
| | - Vera Koniecnzy
- Department of Pharmacology , University of Cambridge , Tennis Court Road , Cambridge , CB2 1PD , UK
| | - Colin W Taylor
- Department of Pharmacology , University of Cambridge , Tennis Court Road , Cambridge , CB2 1PD , UK
| | - Kana M Sureshan
- School of Chemistry , Indian Institute of Science Education and Research Thiruvananthapuram , Kerala 695016 , India . ; http://kms514.wix.com/kmsgroup
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Synthesis and in vitro anticancer activity evaluation of novel bioreversible phosphate inositol derivatives. Eur J Med Chem 2015; 93:172-81. [DOI: 10.1016/j.ejmech.2015.01.064] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2014] [Revised: 12/29/2014] [Accepted: 01/31/2015] [Indexed: 01/13/2023]
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7
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Chen WB, Liu JB, Dou DL, Song FB, Li LY, Xi Z. Synthesis and screening of novel inositol phosphonate derivatives for anticancer functions in vitro. CHINESE CHEM LETT 2015. [DOI: 10.1016/j.cclet.2014.11.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Khalili H, Godwin A, Choi JW, Lever R, Khaw PT, Brocchini S. Fab-PEG-Fab as a Potential Antibody Mimetic. Bioconjug Chem 2013; 24:1870-82. [DOI: 10.1021/bc400246z] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Hanieh Khalili
- UCL
School of Pharmacy, University College London, 29-39 Brunswick Square, London WC1N 1AX, United Kingdom
- NIHR
Biomedical Research Centre, Moorfields Eye Hospital and UCL Institute of Ophthalmology, London, EC1 V 9EL, United Kingdom
| | - Antony Godwin
- PolyTherics
Ltd, The London Bioscience Innovation Centre, 2 Royal College Street, London NW1 0NH, United Kingdom
| | - Ji-won Choi
- PolyTherics
Ltd, The London Bioscience Innovation Centre, 2 Royal College Street, London NW1 0NH, United Kingdom
| | - Rebecca Lever
- UCL
School of Pharmacy, University College London, 29-39 Brunswick Square, London WC1N 1AX, United Kingdom
| | - Peng T. Khaw
- NIHR
Biomedical Research Centre, Moorfields Eye Hospital and UCL Institute of Ophthalmology, London, EC1 V 9EL, United Kingdom
| | - Steve Brocchini
- UCL
School of Pharmacy, University College London, 29-39 Brunswick Square, London WC1N 1AX, United Kingdom
- NIHR
Biomedical Research Centre, Moorfields Eye Hospital and UCL Institute of Ophthalmology, London, EC1 V 9EL, United Kingdom
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Scheibe C, Wedepohl S, Riese SB, Dernedde J, Seitz O. Carbohydrate-PNA and aptamer-PNA conjugates for the spatial screening of lectins and lectin assemblies. Chembiochem 2013; 14:236-50. [PMID: 23292704 DOI: 10.1002/cbic.201200618] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2012] [Indexed: 11/06/2022]
Abstract
Nucleic acid architectures offer intriguing opportunities for the interrogation of structural properties of protein receptors. In this study, we performed a DNA-programmed spatial screening to characterize two functionally distinct receptor systems: 1) structurally well-defined Ricinus communis agglutinin (RCA(120)), and 2) rather ill-defined assemblies of L-selectin on nanoparticles and leukocytes. A robust synthesis route that allowed the attachment both of carbohydrate ligands-such as N-acetyllactosamine (LacNAc), sialyl-Lewis-X (sLe(X)), and mannose-and of a DNA aptamer to PNAs was developed. A systematically assembled series of different PNA-DNA complexes served as multivalent scaffolds to control the spatial alignments of appended lectin ligands. The spatial screening of the binding sites of RCA(120) was in agreement with the crystal structure analysis. The study revealed that two appropriately presented LacNAc ligands suffice to provide unprecedented RCA(120) affinity (K(D) = 4 μM). In addition, a potential secondary binding site was identified. Less dramatic binding enhancements were obtained when the more flexible L-selectin assemblies were probed. This study involved the bivalent display both of the weak-affinity sLe(X) ligand and of a high-affinity DNA aptamer. Bivalent presentation led to rather modest (sixfold or less) enhancements of binding when the self-assemblies were targeted against L-selectin on gold nanoparticles. Spatial screening of L-selectin on the surfaces of leukocytes showed higher affinity enhancements (25-fold). This and the distance-activity relationships indicated that leukocytes permit dense clustering of L-selectin.
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Affiliation(s)
- Christian Scheibe
- Institut für Chemie, Humboldt Universität zu Berlin, Brook-Taylor-Strasse 2, 12489 Berlin, Germany
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10
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Mills SJ, Luyten T, Erneux C, Parys JB, Potter BVL. Multivalent benzene polyphosphate derivatives are non-Ca 2+-mobilizing Ins(1,4,5)P 3 receptor antagonists. MESSENGER (LOS ANGELES, CALIF. : PRINT) 2012; 1:167-181. [PMID: 24749014 PMCID: PMC3988618 DOI: 10.1166/msr.2012.1016] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Inositol 1,4,5-trisphosphate [Ins(1,4,5)P31] mobilizes intracellular Ca2+ through the Ins(1,4,5)P3 receptor [InsP3R]. Although some progress has been made in the design of synthetic InsP3R partial agonists and antagonists, there are still few examples of useful small molecule competitive antagonists. A "multivalent" approach is explored and new dimeric polyphosphorylated aromatic derivatives were designed, synthesized and biologically evaluated. The established weak InsP3R ligand benzene 1,2,4-trisphosphate [Bz(1,2,4)P32] is dimerized through its 5-position in two different ways, first directly as the biphenyl derivative biphenyl 2,2',4,4',5,5'-hexakisphosphate, [BiPh(2,2',4,4',5,5')P68] and with its regioisomeric biphenyl 3,3',4,4',5,5'-hexakisphosphate [BiPh(3,3',4,4',5,5')P611]. Secondly, a linker motif is introduced in a flexible ethylene-bridged dimer (9) with its corresponding 1,2-bisphosphate dimer (10), both loosely analogous to the very weak antagonist 1,2-bis(2-aminophenoxy)ethane-N,N,N',N'-tetraacetic acid (BAPTA 7). In permeabilized L15 fibroblasts overexpressing type 1 InsP3R, BiPh(2,2',4,4',5,5')P6 (8) inhibits Ins(1,4,5)P3-induced Ca2+ release in a apparently competitive fashion [IC50 187 nM] and the Bz(1,2,4)P3 dimer (9) is only slightly weaker [IC50 380 nM]. Compounds were also evaluated against type I Ins(1,4,5)P3 5-phosphatase. All compounds are resistant to dephosphorylation, with BiPh(2,2',4,4',5,5')P6 (8), being the most effective inhibitor of any biphenyl derivative synthesized to date [IC50 480 nM] and the Bz(1,2,4)P3 ethylene dimer (9) weaker [IC50 3.55 μM]. BiPh(3,3',4,4',5,5')P6 (11) also inhibits 5-phosphatase [IC50 730 nM] and exhibits unexpected Ca2+ releasing activity [EC50 800 nM]. Thus, relocation of only a single mirrored phenyl phosphate group in (11) from that of antagonist (8) does not markedly change enzyme inhibitory activity, but elicits a dramatic switch in Ca2+-releasing activity. Such new agents demonstrate the power of the multivalent approach and may be useful to investigate the chemical biology of signaling through InsP3R and as templates for further design.
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Affiliation(s)
- Stephen J Mills
- Wolfson Laboratory of Medicinal Chemistry, Department of Pharmacy and Pharmacology, University of Bath, Claverton Down, Bath, BA2 7AY, UK
| | - Tomas Luyten
- Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, KU Leuven, Campus Gasthuisberg O/N-1, Herestraat 49, Bus 802, 3000 Leuven, Belgium
| | - Christophe Erneux
- Institut de Recherche Interdisciplinaire (IRIBHM), Université Libre de Bruxelles, Campus Erasme, Brussels, Belgium
| | - Jan B. Parys
- Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, KU Leuven, Campus Gasthuisberg O/N-1, Herestraat 49, Bus 802, 3000 Leuven, Belgium
| | - Barry V. L. Potter
- Professor B. V. L. Potter, Department of Pharmacy and Pharmacology, University of Bath, Claverton Down, Bath, BA2 7AY, UK. University of Bath, Claverton Down, Bath, BA2 7AY, Tel: +44 1225 386639; Fax: +44 1225 386114;
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11
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Song F, Zhang J, Zhao Y, Chen W, Li L, Xi Z. Synthesis and antitumor activity of inositol phosphotriester analogues. Org Biomol Chem 2012; 10:3642-54. [DOI: 10.1039/c2ob00031h] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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12
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Shan M, Bujotzek A, Abendroth F, Wellner A, Gust R, Seitz O, Weber M, Haag R. Conformational Analysis of Bivalent Estrogen Receptor Ligands: From Intramolecular to Intermolecular Binding. Chembiochem 2011; 12:2587-98. [DOI: 10.1002/cbic.201100529] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2011] [Indexed: 11/07/2022]
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13
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Scheibe C, Bujotzek A, Dernedde J, Weber M, Seitz O. DNA-programmed spatial screening of carbohydrate–lectin interactions. Chem Sci 2011. [DOI: 10.1039/c0sc00565g] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Sun M, Wang Y, Shen J, Xiao Y, Su Z, Ping Q. Octreotide-modification enhances the delivery and targeting of doxorubicin-loaded liposomes to somatostatin receptors expressing tumor in vitro and in vivo. NANOTECHNOLOGY 2010; 21:475101. [PMID: 21030757 DOI: 10.1088/0957-4484/21/47/475101] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Octreotide is believed to be the ligand of somatostatin receptors (SSTRs) which are widely used in tumor diagnosis and clinical therapy. In the present work, a new targeting conjugate, octreotide-polyethylene glycol-phosphatidylethanolamine (Oct-PEG-PE), was developed for the assembling of liposome, and the effect of octreotide-modification on the enhancement of the delivery and targeting of doxorubicin-loaded liposomes was investigated in vitro and in vivo. Oct-PEG-PE was synthesized by a three-step reaction involving two derivative intermediate formations of bis (p-nitrophenyl carbonate)-PEG ((pNP)(2)-PEG) and pNP-PEG-PE. The Oct-modified and unmodified liposomes (DOX-OL and DOX-CL) were prepared by the ammonium sulfate gradient method. Both drug uptake assay and cell apoptosis assay suggested that DOX-OL noticeably increased the uptake of DOX in SMMC-7721 cells and showed a more significant cytotoxicity, compared with DOX-CL. The effect of DOX-OL was remarkably inhibited by free octreotide. In contrast, no significant difference in drug cytotoxicity was found between DOX-OL and DOX-CL in CHO cells without obvious expression of SSTRs. The study of ex vivo fluorescence tissues imaging of BALB/c mice and in vivo tissue distribution of B16 tumor-bearing mice indicated that DOX-OL caused remarkable accumulation of DOX in melanoma tumors and the pancreas, in which the SSTRs are highly expressed.
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Affiliation(s)
- Minjie Sun
- School of Pharmacy, China Pharmaceutical University, Nanjing, People's Republic of China.
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Best MD, Zhang H, Prestwich GD. Inositol polyphosphates, diphosphoinositol polyphosphates and phosphatidylinositol polyphosphate lipids: Structure, synthesis, and development of probes for studying biological activity. Nat Prod Rep 2010; 27:1403-30. [DOI: 10.1039/b923844c] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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16
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Rossi AM, Riley AM, Tovey SC, Taufiq-Ur-Rahman, Dellis O, Taylor EJA, Veresov VG, Potter BVL, Taylor CW. Synthetic partial agonists reveal key steps in IP3 receptor activation. Nat Chem Biol 2009; 5:631-9. [PMID: 19668195 PMCID: PMC2869033 DOI: 10.1038/nchembio.195] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2009] [Accepted: 05/28/2009] [Indexed: 11/10/2022]
Abstract
Inositol 1,4,5-trisphosphate receptors (IP(3)Rs) are ubiquitous intracellular Ca2+ channels. IP(3) binding to the IP(3)-binding core (IBC) near the N terminus initiates conformational changes that lead to opening of a pore. The mechanisms underlying this process are unresolved. We synthesized 2-O-modified IP(3) analogs that are partial agonists of IP(3)R. These are similar to IP(3) in their interactions with the IBC, but they are less effective than IP(3) in rearranging the relationship between the IBC and the N-terminal suppressor domain (SD), and they open the channel at slower rates. IP(3)R with a mutation in the SD occupying a position similar to the 2-O substituent of the partial agonists has a reduced open probability that is similar for full and partial agonists. Bulky or charged substituents from either the ligand or the SD therefore block obligatory coupling of the IBC and the SD. Analysis of DeltaG for ligand binding shows that IP(3) is recognized by the IBC and conformational changes then propagate entirely via the SD to the pore.
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Affiliation(s)
- Ana M. Rossi
- Department of Pharmacology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1PD, UK
| | - Andrew M. Riley
- Wolfson Laboratory of Medicinal Chemistry, Department of Pharmacy and Pharmacology, University of Bath, Claverton Down, Bath, BA2 7AY, UK
| | - Stephen C. Tovey
- Department of Pharmacology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1PD, UK
| | - Taufiq-Ur-Rahman
- Department of Pharmacology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1PD, UK
| | - Olivier Dellis
- Department of Pharmacology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1PD, UK
| | - Emily J. A. Taylor
- Department of Pharmacology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1PD, UK
| | - Valery G. Veresov
- Department of Cell Biophysics, Institute of Biophysics and Cell Engineering, Minsk 220072, Academicheskaya St. 27, Belarus
| | - Barry V. L. Potter
- Wolfson Laboratory of Medicinal Chemistry, Department of Pharmacy and Pharmacology, University of Bath, Claverton Down, Bath, BA2 7AY, UK
| | - Colin W. Taylor
- Department of Pharmacology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1PD, UK
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Zhang L, Huang W, Tanimura A, Morita T, Harihar S, Dewald DB, Prestwich GD. Synthesis and biological activity of metabolically stabilized cyclopentyl trisphosphate analogues of D-myo-Ins(1,4,5)P3. ChemMedChem 2008; 2:1281-9. [PMID: 17589888 DOI: 10.1002/cmdc.200700071] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
We describe the synthesis of four novel metabolically stabilized analogues of Ins(1,4,5)P(3) based on the known cyclopentane pentaol tris(phosphate) 2: tris(phosphorothioate) 3, tris(methylenephosphate) 4, tris(sulfonamide) 5, and tris(sulfate) 6. Of these analogues, only the tris(phosphorothioate) 3 and parent tris(phosphate) 2 bound to the type I InsP(3)R construct. In addition, both the tris(phosphorothioate) 3 and parent tris(phosphate) 2 elicited calcium release in MDA MB-435 breast cancer cells. The Ins(1,4,5)P(3) agonist activities of these two compounds can be rationalized on the basis of computational docking of the ligands to the binding domain of the type I InsP(3)R.
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Affiliation(s)
- Liuyin Zhang
- Department of Medicinal Chemistry, The University of Utah, 419 Wakara Way, Suite 205, Salt Lake City, UT 84108-1257, USA
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Mochizuki T, Kondo Y, Abe H, Tovey SC, Dedos SG, Taylor CW, Paul M, Potter BVL, Matsuda A, Shuto S. Synthesis of adenophostin A analogues conjugating an aromatic group at the 5'-position as potent IP3 receptor ligands. J Med Chem 2006; 49:5750-8. [PMID: 16970399 DOI: 10.1021/jm060310d] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Previous structure-activity relationship studies of adenophostin A, a potent IP(3) receptor agonist, led us to design the novel adenophostin A analogues 5a-c, conjugating an aromatic group at the 5'-position to develop useful IP(3) receptor ligands. The common key intermediate, a D-ribosyl alpha-D-glucoside 10alpha, was stereoselectively synthesized by a glycosidation with the 1-sulfinylglucoside donor 11, which was conformationally restricted by a 3,4-O-cyclic diketal protecting group. After introduction of an aromatic group at the 5-position of the ribose moiety, an adenine base was stereoselectively introduced at the anomeric beta-position to form 7a-c, where the tetra-O-i-butyryl donors 9a-c were significantly more effective than the corresponding O-acetyl donor. Thus, the target compounds 5a-c were synthesized via phosphorylation of the 2', 3' ', and 4' '-hydroxyls. The potencies of compounds 5a-c for Ca(2+) release were shown to be indistinguishable from that of adenophostin A, indicating that bulky substitutions at the 5'-position of adenophostin A are well-tolerated in the receptor binding. This biological activity of 5a-c can be rationalized by molecular modeling using the ligand binding domain of the IP(3) receptor.
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Affiliation(s)
- Tetsuya Mochizuki
- Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan
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19
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Dellis O, Dedos SG, Tovey SC, Dubel SJ, Taylor CW. Ca2+ entry through plasma membrane IP3 receptors. Science 2006; 313:229-33. [PMID: 16840702 DOI: 10.1126/science.1125203] [Citation(s) in RCA: 146] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Inositol 1,4,5-trisphosphate receptors (IP3Rs) release calcium ions, Ca2+, from intracellular stores, but their roles in mediating Ca2+ entry are unclear. IP3 stimulated opening of very few (1.9 +/- 0.2 per cell) Ca2+-permeable channels in whole-cell patch-clamp recording of DT40 chicken or mouse B cells. Activation of the B cell receptor (BCR) in perforated-patch recordings evoked the same response. IP3 failed to stimulate intracellular or plasma membrane (PM) channels in cells lacking IP3R. Expression of IP3R restored both responses. Mutations within the pore affected the conductances of IP3-activated PM and intracellular channels similarly. An impermeant pore mutant abolished BCR-evoked Ca2+ signals, and PM IP3Rs were undetectable. After introduction of an alpha-bungarotoxin binding site near the pore, PM IP3Rs were modulated by extracellular alpha-bungarotoxin. IP(3)Rs are unusual among endoplasmic reticulum proteins in being also functionally expressed at the PM, where very few IP3Rs contribute substantially to the Ca2+ entry evoked by the BCR.
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MESH Headings
- Animals
- B-Lymphocytes/metabolism
- Bungarotoxins/metabolism
- Bungarotoxins/pharmacology
- Calcium/metabolism
- Calcium Channels/genetics
- Calcium Channels/metabolism
- Calcium Signaling
- Cell Membrane/metabolism
- Cells, Cultured
- Chickens
- Electric Conductivity
- Endoplasmic Reticulum/metabolism
- Inositol 1,4,5-Trisphosphate/metabolism
- Inositol 1,4,5-Trisphosphate Receptors
- Ion Channel Gating
- Mice
- Nuclear Envelope/metabolism
- Patch-Clamp Techniques
- Point Mutation
- Rats
- Receptors, Antigen, B-Cell/metabolism
- Receptors, Cytoplasmic and Nuclear/antagonists & inhibitors
- Receptors, Cytoplasmic and Nuclear/genetics
- Receptors, Cytoplasmic and Nuclear/metabolism
- Transfection
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Affiliation(s)
- Olivier Dellis
- Department of Pharmacology, Tennis Court Road, Cambridge, CB2 1PD, UK
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20
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Poinas A, Backers K, Riley AM, Mills SJ, Moreau C, Potter BVL, Erneux C. Interaction of the catalytic domain of inositol 1,4,5-trisphosphate 3-kinase A with inositol phosphate analogues. Chembiochem 2005; 6:1449-57. [PMID: 15997461 DOI: 10.1002/cbic.200400443] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The levels of inositol 1,4,5-trisphosphate [Ins(1,4,5)P3] in the cytoplasm are tightly regulated by two enzymes, Ins(1,4,5)P3 3-kinase and type I Ins(1,4,5)P3 5-phosphatase. The catalytic domain of Ins(1,4,5)P3 3-kinase (isoenzymes A, B and C) is restricted to approximately 275 amino acids at the C-terminal end. We were interested in understanding the catalytic mechanism of this key family of enzymes in order to exploit this in inhibitor design. We expressed the catalytic domain of rat Ins(1,4,5)P3 3-kinase A in Escherichia coli as a His- and S-tagged fusion protein. The purified enzyme was used in an Ins(1,4,5)P3 kinase assay to phosphorylate a series of inositol phosphate analogues with three or four phosphate groups. A synthetic route to D-2-deoxy-Ins(1,4,5)P3 was devised. D-2-Deoxy-Ins(1,4,5)P3 and D-3-deoxy-Ins(1,4,6)P3 were potent inhibitors of the enzyme, with IC50 values in the micromolar range. Amongst all analogues tested, only D-2-deoxy-Ins(1,4,5)P3 appears to be a good substrate of the Ins(1,4,5)P3 3-kinase. Therefore, the axial 2-hydroxy group of Ins(1,4,5)P3 is not involved in recognition of the substrate nor does it participate in the phosphorylation mechanism of Ins(1,4,5)P3. In contrast, the equatorial 3-hydroxy function must be present in that configuration for phosphorylation to occur. Our data indicate the importance of the 3-hydroxy function in the mechanism of inositol trisphosphate phosphorylation rather than in substrate binding.
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Affiliation(s)
- Alexandra Poinas
- Interdisciplinary Research Institute (IRIBHM), Université Libre de Bruxelles, Campus Erasme, Bldg C, 808 Route de Lennik, 1070 Brussels, Belgium
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21
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Handl HL, Vagner J, Han H, Mash E, Hruby VJ, Gillies RJ. Hitting multiple targets with multimeric ligands. Expert Opin Ther Targets 2005; 8:565-86. [PMID: 15584863 DOI: 10.1517/14728222.8.6.565] [Citation(s) in RCA: 93] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Multimeric ligands consist of multiple monomeric ligands attached to a single backbone molecule, creating a multimer that can bind to multiple receptors or targets simultaneously. Numerous examples of multimeric binding exist within nature. Due to the multiple and simultaneous binding events, multimeric ligands bind with an increased affinity compared to their corresponding monomers. Multimeric ligands may provide opportunities in the field of drug discovery by providing enhanced selectivity and affinity of binding interactions, thus providing molecular-based targeted therapies. However, gaps in our knowledge currently exist regarding the quantitative measures for important design characteristics, such as flexibility, length and orientation of the inter-ligand linkers, receptor density and ligand sequence. In this review, multimeric ligand binding in two separate phases is examined. The prerecruitment phase describes the binding of one ligand of a multimer to its corresponding receptor, an event similar to monomeric ligand binding. This results in transient increases in the local concentration of the other ligands, leading to apparent cooperativity. The postrecruitment phase only occurs once all receptors have been aligned and bound by their corresponding ligand. This phase is analogous to DNA-DNA interactions in that the stability of the complex is derived from physical orientation. Multiple factors influence the kinetics and thermodynamics of multimeric binding, and these are discussed.
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Affiliation(s)
- Heather L Handl
- Arizona Cancer Center, Department of Biochemistry and Molecular Biophysics, 1515 N. Campbell Avenue, Tucson, AZ 85724-5024, USA
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22
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Berry DF, Berry DA. Tethered phytic acid as a probe for measuring phytase activity. Bioorg Med Chem Lett 2005; 15:3157-61. [PMID: 15878271 DOI: 10.1016/j.bmcl.2005.04.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2005] [Revised: 04/04/2005] [Accepted: 04/05/2005] [Indexed: 11/28/2022]
Abstract
A novel approach for measuring phytase activity is presented. We have developed a new chromophoric substrate analog of phytic acid, 5-O-[6-(benzoylamino)hexyl]-d-myo-inositol-1,2,3,4,6-pentakisphosphate that permits direct measurement of the phosphate ester bond-cleavage reaction using HPLC. This compound, along with its dephosphorylated T-phosphatidylinositol intermediates, are quantified using reversed phase chromatography with UV detection.
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Affiliation(s)
- Duane F Berry
- Virginia Polytechnic Institute and State University, Department of Crop and Soil Environmental Sciences, Blacksburg, VA 24061, USA.
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23
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Moris MA, Caron AZ, Guillemette G, Rognan D, Schmitt M, Schlewer G. Synthesis of (±)-2-O-[4‘-(N-9‘ ‘-Purinyl)butyl] myo-Inositol 1,4,5-Tris(phosphate), a Potent Full Agonist at the d-myo-Inositol 1,4,5-Tris(phosphate) Receptor. J Med Chem 2005; 48:1251-5. [PMID: 15715492 DOI: 10.1021/jm049458s] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Racemic 2-O-[4'(9''-N-purinyl)butyl] myo-inositol 1,4,5-tris(phosphate) 8 was synthesized starting from myo-inositol. Substitution of position 2 by an alkyl side chain was rendered possible by inversion of the chair conformation of the inositol ring by means of an orthoester. The final compound is a full agonist with the same order of potency as d-myo-inositol 1,4,5-tris(phosphate).
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MESH Headings
- Adrenal Cortex/ultrastructure
- Animals
- Calcium/metabolism
- Calcium Channels/metabolism
- Cattle
- Cell Line
- Endoplasmic Reticulum/metabolism
- In Vitro Techniques
- Inositol 1,4,5-Trisphosphate/analogs & derivatives
- Inositol 1,4,5-Trisphosphate/chemical synthesis
- Inositol 1,4,5-Trisphosphate/chemistry
- Inositol 1,4,5-Trisphosphate/metabolism
- Inositol 1,4,5-Trisphosphate/pharmacology
- Inositol 1,4,5-Trisphosphate Receptors
- Microsomes/drug effects
- Microsomes/metabolism
- Molecular Conformation
- Pancreas/cytology
- Permeability
- Purines/chemical synthesis
- Purines/chemistry
- Purines/pharmacology
- Radioligand Assay
- Receptors, Cytoplasmic and Nuclear/agonists
- Receptors, Cytoplasmic and Nuclear/metabolism
- Stereoisomerism
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Affiliation(s)
- Marc-Antoine Moris
- Laboratoire de Pharmacochimie de la Communication Cellulaire UMR 7081 du CNRS, Faculté de Pharmacie, Université Louis Pasteur de Strasbourg, 74, route du Rhin, 67401 Illkirch, France
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24
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Bosanac I, Michikawa T, Mikoshiba K, Ikura M. Structural insights into the regulatory mechanism of IP3 receptor. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2004; 1742:89-102. [PMID: 15590059 DOI: 10.1016/j.bbamcr.2004.09.016] [Citation(s) in RCA: 94] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2004] [Revised: 09/10/2004] [Accepted: 09/14/2004] [Indexed: 12/15/2022]
Abstract
Inositol 1,4,5-trisphosphate receptors (IP(3)R) are intracellular Ca(2+) release channels whose opening requires binding of two intracellular messengers IP(3) and Ca(2+). The regulation of IP(3)R function has also been shown to involve a variety of cellular proteins. Recent biochemical and structural analyses have deepened our understanding of how the IP(3)-operated Ca(2+) channel functions. Specifically, the atomic resolution structure of the IP(3)-binding region has provided a sound structural basis for the receptor interaction with the natural ligand. Electron microscopic studies have also shed light on the overall shape of the tetrameric receptor. This review aims to provide comprehensive overview of the current information available on the structure and function relationship of IP(3)R.
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Affiliation(s)
- Ivan Bosanac
- Division of Molecular and Structural Biology, Ontario Cancer Institute and Department of Medical Biophysics, University of Toronto, 610 University Avenue, Toronto, Ontario, Canada M5G 2M9
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25
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Riley AM, Dozol H, Spiess B, Potter BVL. 2-O-(2-Aminoethyl)-myo-inositol 1,4,5-trisphosphate as a novel ligand for conjugation: physicochemical properties and synthesis of a new Ins(1,4,5)P(3) affinity matrix. Biochem Biophys Res Commun 2004; 318:444-52. [PMID: 15120621 DOI: 10.1016/j.bbrc.2004.04.051] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2004] [Indexed: 11/22/2022]
Abstract
2-O-(2-Aminoethyl)-Ins(1,4,5)P(3), (5), a novel derivative of the Ca(2+)-mobilising second messenger d-myo-inositol 1,4,5-trisphosphate [Ins(1,4,5)P(3)], was synthesised from myo-inositol. 5 was found to be a potent mobiliser of intracellular Ca(2+), and an Ins(1,4,5)P(3) affinity matrix synthesised from 5 was effective at selectively binding N-terminal fragments of the Ins(1,4,5)P(3) receptor containing the intact Ins(1,4,5)P(3) binding site. The microprotonation scheme for 5 was resolved and the related constants were determined in comparison with Ins(1,4,5)P(3) and another reactive Ins(1,4,5)P(3) analogue 1-O-(2-aminoethyl-1-phospho)-Ins(4,5)P(2), (2a), by potentiometric and NMR titration methods. The (31)P and (1)H NMR titration curves for compound 5 and Ins(1,4,5)P(3) are remarkably close, indicating analogous acid-base properties and intramolecular interactions for the two compounds. The 1-phosphate-modified Ins(1,4,5)P(3) derivative 2a, on the contrary, behaves as a bisphosphorylated rather than a trisphosphorylated inositol. Thus, 5 is a new reactive Ins(1,4,5)P(3) analogue of considerable potential for investigation of the chemical biology of Ins(1,4,5)P(3)-mediated cellular signalling.
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Affiliation(s)
- Andrew M Riley
- Wolfson Laboratory of Medicinal Chemistry, Department of Pharmacy and Pharmacology, University of Bath, Bath BA2 7AY, UK
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