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Zhang H, Zeng C, Zhu Q, Zhu D, Yu B. Synthesis of the Reducing-end Hexasaccharide Fragment of Marine Lipopolysaccharide Axinelloside A. Chemistry 2024; 30:e202304180. [PMID: 38180294 DOI: 10.1002/chem.202304180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Revised: 12/27/2023] [Accepted: 01/05/2024] [Indexed: 01/06/2024]
Abstract
Chemical synthesis of an orthogonally protected hexasaccharide relevant to the reducing-end half of axinelloside A, a highly sulfated marine lipopolysaccharide, is disclosed. The synthesis features preparation of the scyllo-inositol unit via a Ferrier-type-II rearrangement, construction of the 1,2-cis-glycosidic bonds via remote participation, and concise [2+2+2] assembly via Au(I)-catalyzed glycosylation.
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Affiliation(s)
- Haoliang Zhang
- State Key Laboratory of Chemical Biology, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, China
| | - Changgen Zeng
- State Key Laboratory of Chemical Biology, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, China
| | - Qian Zhu
- State Key Laboratory of Chemical Biology, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, China
| | - Dapeng Zhu
- Institute of Translational Medicine, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China
| | - Biao Yu
- State Key Laboratory of Chemical Biology, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, China
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2
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Joffrin AM, Saunders AM, Barneda D, Flemington V, Thompson AL, Sanganee HJ, Conway SJ. Development of isotope-enriched phosphatidylinositol-4- and 5-phosphate cellular mass spectrometry probes. Chem Sci 2021; 12:2549-2557. [PMID: 34820112 PMCID: PMC8607509 DOI: 10.1039/d0sc06219g] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Accepted: 12/28/2020] [Indexed: 12/20/2022] Open
Abstract
Synthetic phosphatidylinositol phosphate (PtdInsPn) derivatives play a pivotal role in broadening our understanding of PtdInsPn metabolism. However, the development of such tools is reliant on efficient enantioselective and regioselective synthetic strategies. Here we report the development of a divergent synthetic route applicable to the synthesis of deuterated PtdIns4P and PtdIns5P derivatives. The synthetic strategy developed involves a key enzymatic desymmetrisation step using Lipozyme TL-IM®. In addition, we optimised the large-scale synthesis of deuterated myo-inositol, allowing for the preparation of a series of saturated and unsaturated deuterated PtdIns4P and PtdIns5P derivatives. Experiments in MCF7 cells demonstrated that these deuterated probes enable quantification of the corresponding endogenous phospholipids in a cellular setting. Overall, these deuterated probes will be powerful tools to help improve our understanding of the role played by PtdInsPn in physiology and disease. We report the synthesis of deuterium-labelled derivatives of phosphatidylinositol 4-phosphate and phosphatidylinositol 5-phosphate, and demonstrate their use in quantifying levels of endogenous phospholipids in cells.![]()
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Affiliation(s)
- Amélie M Joffrin
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford Mansfield Road Oxford OX1 3TA UK
| | - Alex M Saunders
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford Mansfield Road Oxford OX1 3TA UK
| | - David Barneda
- Inositide Laboratory, Babraham Institute Babraham Research Campus Cambridge CB22 3AT UK.,Bioscience, Oncology R&D, AstraZeneca Cambridge CB4 0WG UK
| | | | - Amber L Thompson
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford Mansfield Road Oxford OX1 3TA UK
| | - Hitesh J Sanganee
- Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca Cambridge UK
| | - Stuart J Conway
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford Mansfield Road Oxford OX1 3TA UK
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3
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Novel isochroman-triazoles and thiadiazole hybrids: Design, synthesis and antimicrobial activity. JOURNAL OF SAUDI CHEMICAL SOCIETY 2017. [DOI: 10.1016/j.jscs.2015.04.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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4
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Bru M, Kotkar SP, Kar N, Köhn M. Development of a solid phase synthesis strategy for soluble phosphoinositide analogues. Chem Sci 2012. [DOI: 10.1039/c2sc01061e] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
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Anderson RJ, Osborne SL, Meunier FA, Painter GF. Regioselective Approach to Phosphatidylinositol 3,5-Bisphosphates: Syntheses of the Native Phospholipid and Biotinylated Short-Chain Derivative. J Org Chem 2010; 75:3541-51. [DOI: 10.1021/jo100393c] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Regan J. Anderson
- Carbohydrate Chemistry Team, Industrial Research Limited, PO Box 31-310, Lower Hutt, New Zealand
| | - Shona L. Osborne
- Molecular Dynamics of Synaptic Function Laboratory, Queensland Brain Institute and School of Biomedical Sciences, The University of Queensland, St. Lucia, 4072 Queensland, Australia
| | - Frederic A. Meunier
- Molecular Dynamics of Synaptic Function Laboratory, Queensland Brain Institute and School of Biomedical Sciences, The University of Queensland, St. Lucia, 4072 Queensland, Australia
| | - Gavin F. Painter
- Carbohydrate Chemistry Team, Industrial Research Limited, PO Box 31-310, Lower Hutt, New Zealand
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6
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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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7
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Conway SJ, Gardiner J, Grove SJA, Johns MK, Lim ZY, Painter GF, Robinson DEJE, Schieber C, Thuring JW, Wong LSM, Yin MX, Burgess AW, Catimel B, Hawkins PT, Ktistakis NT, Stephens LR, Holmes AB. Synthesis and biological evaluation of phosphatidylinositol phosphate affinity probes. Org Biomol Chem 2009; 8:66-76. [PMID: 20024134 DOI: 10.1039/b913399b] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The synthesis of the complete family of phosphatidylinositol phosphate analogues (PIPs) from five key core intermediates A-E is described. These core compounds were obtained from myo-inositol orthoformate 1 via regioselective DIBAL-H and trimethylaluminium-mediated cleavages and a resolution-protection process using camphor acetals 10. Coupling of cores A-E with phosphoramidites 34 and 38, derived from the requisite protected lipid side chains, afforded the fully-protected PIPs. Removal of the remaining protecting groups was achieved via hydrogenolysis using palladium black or palladium hydroxide on carbon in the presence of sodium bicarbonate to afford the complete family of dipalmitoyl- and amino-PIP analogues 42, 45, 50, 51, 58, 59, 67, 68, 76, 77, 82, 83, 92, 93, 99 and 100. Investigations using affinity probes incorporating these compounds have identified novel proteins involved in the PI3K intracellular signalling network and have allowed a comprehensive proteomic analysis of phosphoinositide interacting proteins.
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Affiliation(s)
- Stuart J Conway
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
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Keddie NS, Bultynck G, Luyten T, Slawin AM, Conway SJ. A type 2 Ferrier rearrangement-based synthesis of d-myo-inositol 1,4,5-trisphosphate. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.tetasy.2009.03.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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9
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Panchal N, Gaffney PRJ. Synthesis of unsaturated phosphatidylinositol 4,5-bisphosphate and analogues. Org Biomol Chem 2009; 7:4832-41. [DOI: 10.1039/b907551h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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10
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Kayser-Bricker KJ, Jordan PA, Miller SJ. Catalyst-Dependent Syntheses of Phosphatidylinositol-5 Phosphate-DiC8 and its Enantiomer. Tetrahedron 2008; 64:7015-7020. [PMID: 19606206 PMCID: PMC2673006 DOI: 10.1016/j.tet.2008.03.037] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Peptide-based catalysts have been applied to the enantioselective syntheses of the title compounds, with this being the first report of the synthesis of an ent-PI5P analogue. The key steps in the synthesis involve asymmetric phosphorylation catalysis. Additional maneuvers were developed with a protecting groups scheme that enabled efficient, streamlined syntheses of these important mediators of biochemical events.
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Affiliation(s)
| | - Peter A. Jordan
- Department of Chemistry, Yale University, P. O. Box 208107, New Haven, CT 06520
| | - Scott J. Miller
- Department of Chemistry, Yale University, P. O. Box 208107, New Haven, CT 06520
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11
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Bauder C. A convenient synthesis of orthogonally protected 2-deoxystreptamine (2-DOS) as an aminocyclitol scaffold for the development of novel aminoglycoside antibiotic derivatives against bacterial resistance. Org Biomol Chem 2008; 6:2952-60. [DOI: 10.1039/b804784g] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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12
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Huang W, Zhang H, Davrazou F, Kutateladze TG, Shi X, Gozani O, Prestwich GD. Stabilized phosphatidylinositol-5-phosphate analogues as ligands for the nuclear protein ING2: chemistry, biology, and molecular modeling. J Am Chem Soc 2007; 129:6498-506. [PMID: 17469822 PMCID: PMC2553394 DOI: 10.1021/ja070195b] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The interaction of PtdIns(5)P with the tumor suppressor protein ING2 has been implicated in the regulation of chromatin modification. To enhance the stability of PtdIns(5)P for studies of the biological role in vivo, two phosphatase-resistant moieties were used to replace the labile 5-phosphate. The total asymmetric synthesis of the 5-methylenephosphonate (MP) and 5-phosphothionate (PT) analogues of PtdIns(5)P is described herein, and the resulting metabolically stabilized lipid analogues were evaluated in three ways. First, liposomes containing either the dioleoyl MP or PT analogues bound to recombinant ING2 similar to liposomes containing dipalmitoyl PtdIns(5)P, indicating that the replacement of the hydrolyzable 5-phosphate group does not compromise the binding. Second, the dioleoyl MP and PT PtdIns(5)P analogues were equivalent to dipalmitoyl PtdIns(5)P in augmenting cell death induced by a DNA double-strand break in HT1080 cells. Finally, molecular modeling and docking of the MP or PT analogues to the C-terminus PtdInsP-binding region of ING2 (consisting of a PHD finger and a polybasic region) revealed a number of complementary surface and electrostatic contacts between the lipids and ING2.
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Affiliation(s)
- Wei Huang
- Department of Medicinal Chemistry, The University of Utah, 419 Wakara Way, Suite 205, Salt Lake City, Utah 84108-1257 USA, Phone: +1-801-585-9051. Fax: +1-801-585-9053.
| | - Honglu Zhang
- Department of Medicinal Chemistry, The University of Utah, 419 Wakara Way, Suite 205, Salt Lake City, Utah 84108-1257 USA, Phone: +1-801-585-9051. Fax: +1-801-585-9053.
| | - Foteini Davrazou
- Department of Pharmacology, University of Colorado Health Sciences Center, Aurora, Colorado 80045-0511 USA
| | - Tatiana G. Kutateladze
- Department of Pharmacology, University of Colorado Health Sciences Center, Aurora, Colorado 80045-0511 USA
| | - Xiaobing Shi
- Department of Biological Sciences, Stanford University, Palo Alto, California 94305 USA
| | - Or Gozani
- Department of Biological Sciences, Stanford University, Palo Alto, California 94305 USA
| | - Glenn D. Prestwich
- Department of Medicinal Chemistry, The University of Utah, 419 Wakara Way, Suite 205, Salt Lake City, Utah 84108-1257 USA, Phone: +1-801-585-9051. Fax: +1-801-585-9053.
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13
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Xu Y, Lee SA, Kutateladze TG, Sbrissa D, Shisheva A, Prestwich GD. Chemical synthesis and molecular recognition of phosphatase-resistant analogues of phosphatidylinositol-3-phosphate. J Am Chem Soc 2006; 128:885-97. [PMID: 16417379 PMCID: PMC2535791 DOI: 10.1021/ja0554716] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The remodeling of phosphatidylinositol polyphosphates in cellular membranes by phosphatases and kinases orchestrates the signaling by these lipids in space and time. To provide chemical tools to study the changes in cell physiology mediated by these lipids, three new metabolically stabilized (ms) analogues of phosphatidylinositol-3-phosphate (PtdIns(3)P) were synthesized. We describe herein the total asymmetric synthesis of 3-methylphosphonate, 3-(monofluoromethyl)phosphonate and 3-phosphorothioate analogues of PtdIns(3)P. From differentially protected D-myo-inositol key intermediates, a versatile phosphoramidite reagent was employed in the synthesis of PtdIns(3)P analogues with diacylglyceryl moieties containing dioleoyl, dipalmitoyl, and dibutyryl chains. In addition, we introduce a new phosphorylation reagent, (monofluoromethyl)phosphonyl chloride, which has general applications for the preparation of "pKa-matched" monofluorophosphonates. These ms-PtdIns(3)P analogues exhibited reduced binding activities with 15N-labeled FYVE and PX domains, as significant 1H and 15N chemical shift changes in the FYVE domain were induced by titrating ms-PtdIns(3)P analogues into membrane-mimetic dodecylphosphocholine micelles. In addition, the PtdIns(3)P analogues with dioleoyl and dipalmitoyl chains were substrates for the 5-kinase enzyme PIKfyve; the corresponding phosphorylated ms-PI(3,5)P2 products were detected by radio-TLC analysis.
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Affiliation(s)
- Yong Xu
- Department of Medicinal Chemistry, The University of Utah, 419 Wakara Way, Suite 205, Salt Lake City, Utah 84108-1257 USA
| | - Stephanie A. Lee
- Department of Pharmacology, University of Colorado Health Sciences Center, Aurora, CO 80045 USA
| | - Tatiana G. Kutateladze
- Department of Pharmacology, University of Colorado Health Sciences Center, Aurora, CO 80045 USA
| | - Diego Sbrissa
- Department of Physiology, Wayne State University School of Medicine, 540 E. Canfield Detroit, MI 48201 USA
| | - Assia Shisheva
- Department of Physiology, Wayne State University School of Medicine, 540 E. Canfield Detroit, MI 48201 USA
| | - Glenn D. Prestwich
- Department of Medicinal Chemistry, The University of Utah, 419 Wakara Way, Suite 205, Salt Lake City, Utah 84108-1257 USA
- Phone: +1-801-585-9051. Fax: +1-801-585-9053.
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14
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Gozani O, Field SJ, Ferguson CG, Ewalt M, Mahlke C, Cantley LC, Prestwich GD, Yuan J. Modification of protein sub-nuclear localization by synthetic phosphoinositides: Evidence for nuclear phosphoinositide signaling mechanisms. ACTA ACUST UNITED AC 2005; 45:171-85. [PMID: 16199078 DOI: 10.1016/j.advenzreg.2005.02.010] [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: 01/22/2023]
Abstract
PtdInsPs are critical signaling molecules that regulate diverse cellular functions. One method to study PtdInsP biology involves using synthetic PtdInsP analogs to activate endogenous PtdInsP-mediated events in living cells. Such methodology has been successfully employed to explore the role of several PtdInsP-biological outcomes in the cytoplasm. However, this strategy has not previously been used to examine the function of PtdInsPs in the nucleus of live cells, primarily because there has not been a well-defined PtdInsP-binding protein to provide functional nuclear readouts. Here we have shown that synthetic PtdIns(5)P analogs access and function in the nucleus. We have found that these molecules modify the sub-nuclear localization of PHD finger-containing proteins in live cells and in real time. This work demonstrates that synthetic PtdInsPs and PtdInsP derivatives may be powerful tools for probing nuclear PtdInsP functions. Finally, our work supports a model that endogenous PtdInsPs regulate sub-nuclear localization and function of endogenous nuclear PtdInsP-binding proteins.
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Affiliation(s)
- Or Gozani
- Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA.
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15
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Abstract
Lipid signaling by phosphoinositides (PIP(n)s) involves an array of proteins with lipid recognition, kinase, phosphatase, and phospholipase functions. Understanding PIP(n) pathway signaling requires identification and characterization of PIP(n)-interacting proteins. Moreover, spatiotemporal localization and physiological function of PIP(n)-protein complexes must be elucidated in cellular and organismal contexts. For protein discovery to functional elucidation, reporter-linked phosphoinositides or tethered PIP(n)s have been essential. The phosphoinositide 3-kinase (PI 3-K) signaling pathway has recently emerged as an important source of potential "druggable" therapeutic targets in human pathophysiology in both academic and pharmaceutical environments. This review summarizes the chemistry of PIP(n) affinity probes and their use in identifying macromolecular targets. The process of target validation will be described, i.e., the use of tethered PIP(n)s in determining PIP(n) selectivity in vitro and in establishing the function of PIP(n)-protein complexes in living cells.
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Affiliation(s)
- Glenn D Prestwich
- Department of Medicinal Chemistry, The University of Utah, 419 Wakara Way, Suite 205, Salt Lake City, UT 84108, USA.
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16
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Saito S, Shimazawa R, Shirai R. Diastereoselective Synthesis of D- and L-myo-Inositol 3,4,5,6-Tetrakisphosphates from D-Glucose via Dihydroxylation of (+)-Conduritol B Derivatives. Chem Pharm Bull (Tokyo) 2004; 52:727-32. [PMID: 15187396 DOI: 10.1248/cpb.52.727] [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] [Indexed: 11/22/2022]
Abstract
Syntheses of D- and L-myo-inositol 3,4,5,6-tetrakisphosphates were achieved via diastereoselective 1,2-addition of vinylcopper reagent with the chiral aldehyde prepared from 1,2,5,6-diisopropylidene-D-glucose, ring-closing metathesis of 1,7-diene with Grubbs catalyst followed by catalytic OsO(4) dihydroxylation of (+)-conduritol B derivatives.
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Affiliation(s)
- Shintaro Saito
- Research and Education Center for Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama-cho, Ikoma, Nara 630-0101, Japan
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Han F, Hayashi M, Watanabe Y. Enantiomerically Convergent Synthesis of Phosphatidyl-D-myo-inositol 3,5-Bisphosphate from Both L- and D-1,2-O-Cyclohexylidene-myo-inositol. CHEM LETT 2003. [DOI: 10.1246/cl.2003.724] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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18
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Conrad RM, Grogan MJ, Bertozzi CR. Stereoselective synthesis of myo-inositol via ring-closing metathesis: a building block for glycosylphosphatidylinositol (GPI) anchor synthesis. Org Lett 2002; 4:1359-61. [PMID: 11950362 DOI: 10.1021/ol025680k] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Here we report a concise stereoselective synthesis of myo-inositol via ring-closing metathesis. A readily available bis-Weinreb amide of D-tartrate served as a key intermediate. [reaction: see text]
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Affiliation(s)
- Rosemary M Conrad
- Department of Chemistry, Center for New Directions in Organic Synthesis, University of California, Berkeley, CA 94720
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19
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Nishikawa A, Saito S, Hashimoto Y, Koga K, Shirai R. Synthesis of l-α-phosphatidyl-d-myo-inositol 3,5-bisphosphate from d-glucose. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(01)01946-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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20
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Direct Conversion of 5,6-Unsaturated Hexopyranosyl Compounds to Functionalized Cyclohexanones. Top Curr Chem (Cham) 2001. [DOI: 10.1007/3-540-44422-x_10] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
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21
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Synthesis of dipalmitoyl–phosphatidylinositol 5-phosphate and its modified biological tools. Tetrahedron Lett 2000. [DOI: 10.1016/s0040-4039(00)01541-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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22
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Rohács T, Chen J, Prestwich GD, Logothetis DE. Distinct specificities of inwardly rectifying K(+) channels for phosphoinositides. J Biol Chem 1999; 274:36065-72. [PMID: 10593888 DOI: 10.1074/jbc.274.51.36065] [Citation(s) in RCA: 166] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Activation of several inwardly rectifying K(+) channels (Kir) requires the presence of phosphatidylinositol 4,5-bisphosphate (PtdIns(4,5)P(2)). The constitutively active Kir2.1 (IRK1) channels interact with PtdIns(4,5)P(2) strongly, whereas the G-protein activated Kir3.1/3.4 channels (GIRK1/GIRK4), show only weak interactions with PtdIns(4,5)P(2). We investigated whether these inwardly rectifying K(+) channels displayed distinct specificities for different phosphoinositides. IRK1, but not GIRK1/GIRK4 channels, showed a marked specificity toward phosphates in the 4,5 head group positions. GIRK1/GIRK4 channels were activated with a similar efficacy by PtdIns(3,4)P(2), PtdIns(3,5)P(2), PtdIns(4,5)P(2), and PtdIns(3,4,5)P(3). In contrast, IRK1 channels were not activated by PtdIns(3,4)P(2) and only marginally by high concentrations of PtdIns(3,5)P(2). Similarly, high concentrations of PtdIns(3,4,5)P(3) were required to activate IRK1 channels. For either channel, PtdIns(4)P was much less effective than PtdIns(4,5)P(2), whereas PtdIns was inactive. In contrast to the dependence on the position of phosphates of the phospholipid head group, GIRK1/GIRK4, but not IRK1 channel activation, showed a remarkable dependence on the phospholipid acyl chains. GIRK1/GIRK4 channels were activated most effectively by the natural arachidonyl stearyl PtdIns(4,5)P(2) and much less by the synthetic dipalmitoyl analog, whereas IRK1 channels were activated equally by dipalmitoyl and arachidonyl stearyl PtdIns(4,5)P(2). Incorporation of PtdInsP(2) into the membrane is necessary for activation, as the short chain water soluble diC(4) PtdIns(4,5)P(2) did not activate either channel, whereas activation by diC(8) PtdIns(4, 5)P(2) required high concentrations.
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Affiliation(s)
- T Rohács
- Department of Physiology and Biophysics, Mount Sinai School of Medicine of the New York University, New York, New York 10029, USA
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Blader IJ, Cope MJ, Jackson TR, Profit AA, Greenwood AF, Drubin DG, Prestwich GD, Theibert AB. GCS1, an Arf guanosine triphosphatase-activating protein in Saccharomyces cerevisiae, is required for normal actin cytoskeletal organization in vivo and stimulates actin polymerization in vitro. Mol Biol Cell 1999; 10:581-96. [PMID: 10069805 PMCID: PMC25189 DOI: 10.1091/mbc.10.3.581] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Recent cloning of a rat brain phosphatidylinositol 3,4, 5-trisphosphate binding protein, centaurin alpha, identified a novel gene family based on homology to an amino-terminal zinc-binding domain. In Saccharomyces cerevisiae, the protein with the highest homology to centaurin alpha is Gcs1p, the product of the GCS1 gene. GCS1 was originally identified as a gene conditionally required for the reentry of cells into the cell cycle after stationary phase growth. Gcs1p was previously characterized as a guanosine triphosphatase-activating protein for the small guanosine triphosphatase Arf1, and gcs1 mutants displayed vesicle-trafficking defects. Here, we have shown that similar to centaurin alpha, recombinant Gcs1p bound phosphoinositide-based affinity resins with high affinity and specificity. A novel GCS1 disruption strain (gcs1Delta) exhibited morphological defects, as well as mislocalization of cortical actin patches. gcs1Delta was hypersensitive to the actin monomer-sequestering drug, latrunculin-B. Synthetic lethality was observed between null alleles of GCS1 and SLA2, the gene encoding a protein involved in stabilization of the actin cytoskeleton. In addition, synthetic growth defects were observed between null alleles of GCS1 and SAC6, the gene encoding the yeast fimbrin homologue. Recombinant Gcs1p bound to actin filaments, stimulated actin polymerization, and inhibited actin depolymerization in vitro. These data provide in vivo and in vitro evidence that Gcs1p interacts directly with the actin cytoskeleton in S. cerevisiae.
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Affiliation(s)
- I J Blader
- Departments of Neurobiology and Cell Biology, University of Alabama at Birmingham, Birmingham, Alabama 35294, USA
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Chen J, Feng L, Prestwich GD. Asymmetric Total Synthesis of Phosphatidylinositol 3-Phosphate and 4-Phosphate Derivatives. J Org Chem 1998. [DOI: 10.1021/jo980501r] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jian Chen
- Department of Medicinal Chemistry, The University of Utah, 30 South, 2000 East, Room 201, Salt Lake City, Utah 84112-5820
| | - Li Feng
- Department of Medicinal Chemistry, The University of Utah, 30 South, 2000 East, Room 201, Salt Lake City, Utah 84112-5820
| | - Glenn D. Prestwich
- Department of Medicinal Chemistry, The University of Utah, 30 South, 2000 East, Room 201, Salt Lake City, Utah 84112-5820
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