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Vibhute AM, Sureshan KM. Strength from Weakness: Conformational Divergence between Solid and Solution States of Substituted Cyclitols Facilitated by CH···O Hydrogen Bonding. J Org Chem 2014; 79:4892-908. [DOI: 10.1021/jo5004778] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Amol M. Vibhute
- School
of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram, Thiruvananthapuram, Kerala 695016, India
| | - Kana M. Sureshan
- School
of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram, Thiruvananthapuram, Kerala 695016, India
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4
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Mills SJ, Dozol H, Vandeput F, Backers K, Woodman T, Erneux C, Spiess B, Potter BVL. 3-Hydroxybenzene 1,2,4-Trisphosphate, a Novel Second Messenger Mimic and unusual Substrate for Type-I myo-Inositol 1,4,5-Trisphosphate 5-Phosphatase: Synthesis and Physicochemistry. Chembiochem 2006; 7:1696-706. [PMID: 16964627 DOI: 10.1002/cbic.200600125] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
3-Hydroxybenzene 1,2,4-trisphosphate 4 is a new myo-inositol 1,4,5-trisphosphate analogue based on the core structure of benzene 1,2,4-trisphosphate 2 with an additional hydroxyl group at position-3, and is the first noninositol based compound to be a substrate for inositol 1,4,5-trisphosphate 5-phosphatase. In physicochemical studies on 2, when three equivalents of protons were added, the (31)P NMR spectrum displayed monophasic behaviour in which phosphate-1 and phosphate-2 behaved independently in most of the studied pH range. For compound 4, phosphate-2 and phosphate-4 interacted with the 3-OH group, which does not titrate at physiological pH, displaying complex biphasic behaviour which demonstrated co-operativity between these groups. Phosphate-1 and phosphate-2 strongly interacted with each other and phosphate-4 experienced repulsion because of the interaction of the 3-OH group. Benzene 1,2,4-trisphosphate 2 is resistant to inositol 1,4,5-trisphosphate type I 5-phosphatase catalysed dephosphorylation. However, surprisingly, 3-hydroxybenzene 1,2,4-trisphosphate 4 was dephosphorylated by this 5-phosphatase to give the symmetrical 2,3-dihydroxybenzene 1,4-bisphosphate 16. The extra hydroxyl group is shown to form a hydrogen bond with the vicinal phosphate groups at -15 degrees C, and (1)H NMR titration of the ring and hydroxyl protons in 4 shows the OH proton to be strongly stabilized as soon as the phosphate groups are deprotonated. The effect of the phenolic 3-OH group in compound 4 confirms a critical role for the 6-OH group of the natural messenger in the dephosphorylation mechanism that persists even in radically modified analogues.
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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
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5
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Riley AM, Trusselle M, Kuad P, Borkovec M, Cho J, Choi JH, Qian X, Shears SB, Spiess B, Potter* BVL. scyllo-inositol pentakisphosphate as an analogue of myo-inositol 1,3,4,5,6-pentakisphosphate: chemical synthesis, physicochemistry and biological applications. Chembiochem 2006; 7:1114-22. [PMID: 16755629 PMCID: PMC1892220 DOI: 10.1002/cbic.200600037] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2006] [Indexed: 01/08/2023]
Abstract
myo-Inositol 1,3,4,5,6-pentakisphosphate (Ins(1,3,4,5,6)P(5)), an inositol polyphosphate of emerging significance in cellular signalling, and its C-2 epimer scyllo-inositol pentakisphosphate (scyllo-InsP(5)) were synthesised from the same myo-inositol-based precursor. Potentiometric and NMR titrations show that both pentakisphosphates undergo a conformational ring-flip at higher pH, beginning at pH 8 for scyllo-InsP(5) and pH 9 for Ins(1,3,4,5,6)P(5). Over the physiological pH range, however, the conformation of the inositol rings and the microprotonation patterns of the phosphate groups in Ins(1,3,4,5,6)P(5) and scyllo-InsP(5) are similar. Thus, scyllo-InsP(5) should be a useful tool for identifying biologically relevant actions of Ins(1,3,4,5,6)P(5), mediated by specific binding sites, and distinguishing them from nonspecific electrostatic effects. We also demonstrate that, although scyllo-InsP(5) and Ins(1,3,4,5,6)P(5) are both hydrolysed by multiple inositol polyphosphate phosphatase (MINPP), scyllo-InsP(5) is not dephosphorylated by PTEN or phosphorylated by Ins(1,3,4,5,6)P(5) 2-kinases. This finding both reinforces the value of scyllo-InsP(5) as a biological control and shows that the axial 2-OH group of Ins(1,3,4,5,6)P(5) plays a part in substrate recognition by PTEN and the Ins(1,3,4,5,6)P(5) 2-kinases.
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Affiliation(s)
- Andrew M. Riley
- Dr. A. M. Riley, Dr. M. Trusselle, Prof. Dr. B. V. L. Potter, Wolfson Laboratory of Medicinal Chemistry, Department of Pharmacy and Pharmacology, University of Bath, Claverton Down, Bath, BA2 7AY (UK), Fax: (+44) 1225-386114, E-mail:
| | - Melanie Trusselle
- Dr. A. M. Riley, Dr. M. Trusselle, Prof. Dr. B. V. L. Potter, Wolfson Laboratory of Medicinal Chemistry, Department of Pharmacy and Pharmacology, University of Bath, Claverton Down, Bath, BA2 7AY (UK), Fax: (+44) 1225-386114, E-mail:
| | - Paul Kuad
- Dr. P. Kuad, Prof. Dr. B. Spiess, Département de Pharmacochimie de la Communication Cellulaire, UMR 7175-LC1 du CNRS-ULP, Faculté de Pharmacie, 74, route du Rhin, B. P. 24, 67401 Illkirch Cedex (France.)
| | - Michal Borkovec
- Dr. M. Borkovec, Department of Inorganic, Analytical, and Applied Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, 1211 Geneva 4 (Switzerland)
| | - Jaiesoon Cho
- Dr. J. Cho, Dr. J. H. Choi, Dr. X. Qian, Dr. S. B. Shears, Inositide Signaling Group, Laboratory of Signal Transduction and National Institute of Environmental Health Sciences, Research Triangle Park, NC 27709 (USA)
| | - Jae H. Choi
- Dr. J. Cho, Dr. J. H. Choi, Dr. X. Qian, Dr. S. B. Shears, Inositide Signaling Group, Laboratory of Signal Transduction and National Institute of Environmental Health Sciences, Research Triangle Park, NC 27709 (USA)
| | - Xun Qian
- Dr. J. Cho, Dr. J. H. Choi, Dr. X. Qian, Dr. S. B. Shears, Inositide Signaling Group, Laboratory of Signal Transduction and National Institute of Environmental Health Sciences, Research Triangle Park, NC 27709 (USA)
| | - Stephen B. Shears
- Dr. J. Cho, Dr. J. H. Choi, Dr. X. Qian, Dr. S. B. Shears, Inositide Signaling Group, Laboratory of Signal Transduction and National Institute of Environmental Health Sciences, Research Triangle Park, NC 27709 (USA)
| | - Bernard Spiess
- Dr. P. Kuad, Prof. Dr. B. Spiess, Département de Pharmacochimie de la Communication Cellulaire, UMR 7175-LC1 du CNRS-ULP, Faculté de Pharmacie, 74, route du Rhin, B. P. 24, 67401 Illkirch Cedex (France.)
| | - Barry V. L. Potter*
- Dr. A. M. Riley, Dr. M. Trusselle, Prof. Dr. B. V. L. Potter, Wolfson Laboratory of Medicinal Chemistry, Department of Pharmacy and Pharmacology, University of Bath, Claverton Down, Bath, BA2 7AY (UK), Fax: (+44) 1225-386114, E-mail:
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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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