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Sharaf NG, Shahgholi M, Kim E, Lai JY, VanderVelde DG, Lee AT, Rees DC. Characterization of the ABC methionine transporter from Neisseria meningitidis reveals that lipidated MetQ is required for interaction. eLife 2021; 10:69742. [PMID: 34409939 PMCID: PMC8416018 DOI: 10.7554/elife.69742] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2021] [Accepted: 08/18/2021] [Indexed: 01/05/2023] Open
Abstract
NmMetQ is a substrate-binding protein (SBP) from Neisseria meningitidis that has been identified as a surface-exposed candidate antigen for meningococcal vaccines. However, this location for NmMetQ challenges the prevailing view that SBPs in Gram-negative bacteria are localized to the periplasmic space to promote interaction with their cognate ABC transporter embedded in the bacterial inner membrane. To elucidate the roles of NmMetQ, we characterized NmMetQ with and without its cognate ABC transporter (NmMetNI). Here, we show that NmMetQ is a lipoprotein (lipo-NmMetQ) that binds multiple methionine analogs and stimulates the ATPase activity of NmMetNI. Using single-particle electron cryo-microscopy, we determined the structures of NmMetNI in the presence and absence of lipo-NmMetQ. Based on our data, we propose that NmMetQ tethers to membranes via a lipid anchor and has dual function and localization, playing a role in NmMetNI-mediated transport at the inner membrane and moonlighting on the bacterial surface.
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Affiliation(s)
- Naima G Sharaf
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, United States.,Howard Hughes Medical Institute, California Institute of Technology, Pasadena, United States
| | - Mona Shahgholi
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, United States
| | - Esther Kim
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, United States
| | - Jeffrey Y Lai
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, United States.,Howard Hughes Medical Institute, California Institute of Technology, Pasadena, United States
| | - David G VanderVelde
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, United States
| | - Allen T Lee
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, United States.,Howard Hughes Medical Institute, California Institute of Technology, Pasadena, United States
| | - Douglas C Rees
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, United States.,Howard Hughes Medical Institute, California Institute of Technology, Pasadena, United States
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2
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Buss JA, Bailey GA, Oppenheim J, VanderVelde DG, Goddard WA, Agapie T. CO Coupling Chemistry of a Terminal Mo Carbide: Sequential Addition of Proton, Hydride, and CO Releases Ethenone. J Am Chem Soc 2019; 141:15664-15674. [DOI: 10.1021/jacs.9b07743] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Joshua A. Buss
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard MC 127-72, Pasadena, California 91125, United States
| | - Gwendolyn A. Bailey
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard MC 127-72, Pasadena, California 91125, United States
| | - Julius Oppenheim
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard MC 127-72, Pasadena, California 91125, United States
| | - David G. VanderVelde
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard MC 127-72, Pasadena, California 91125, United States
| | - William A. Goddard
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard MC 127-72, Pasadena, California 91125, United States
| | - Theodor Agapie
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard MC 127-72, Pasadena, California 91125, United States
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3
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Buss JA, VanderVelde DG, Agapie T. Lewis Acid Enhancement of Proton Induced CO2 Cleavage: Bond Weakening and Ligand Residence Time Effects. J Am Chem Soc 2018; 140:10121-10125. [DOI: 10.1021/jacs.8b05874] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Joshua A. Buss
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 E. California Boulevard MC 127-72, Pasadena, California 91125, United States
| | - David G. VanderVelde
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 E. California Boulevard MC 127-72, Pasadena, California 91125, United States
| | - Theodor Agapie
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 E. California Boulevard MC 127-72, Pasadena, California 91125, United States
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4
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Liniger M, VanderVelde DG, Takase MK, Shahgholi M, Stoltz BM. Total Synthesis and Characterization of 7-Hypoquinuclidonium Tetrafluoroborate and 7-Hypoquinuclidone BF3 Complex. J Am Chem Soc 2016; 138:969-74. [PMID: 26713861 DOI: 10.1021/jacs.5b11750] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Derivatives of the fully twisted bicyclic amide 7-hypoquinuclidone are synthesized using a Schmidt-Aubé reaction. Their structures were unambiguously confirmed by X-ray diffraction analysis and extensive spectroscopic characterization. Furthermore, the stability and chemical reactivity of these anti-Bredt amides are investigated. 7-Hypoquinuclidonium tetrafluoroborate is shown to decompose to a unique nitrogen bound amide-BF3 complex of 7-hypoquinuclidone under anhydrous conditions and to react instantaneously with water making it one of the most reactive amides known to date.
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Affiliation(s)
- Marc Liniger
- Division of Chemistry and Chemical Engineering, California Institute of Technology , Pasadena, California 91125, United States
| | - David G VanderVelde
- Division of Chemistry and Chemical Engineering, California Institute of Technology , Pasadena, California 91125, United States
| | - Michael K Takase
- Division of Chemistry and Chemical Engineering, California Institute of Technology , Pasadena, California 91125, United States
| | - Mona Shahgholi
- Division of Chemistry and Chemical Engineering, California Institute of Technology , Pasadena, California 91125, United States
| | - Brian M Stoltz
- Division of Chemistry and Chemical Engineering, California Institute of Technology , Pasadena, California 91125, United States
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5
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Horak KT, VanderVelde DG, Agapie T. Tuning of Metal Complex Electronics and Reactivity by Remote Lewis Acid Binding to π-Coordinated Pyridine Diphosphine Ligands. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00562] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kyle T. Horak
- Division of Chemistry and
Chemical Engineering, California Institute of Technology, 1200 East
California Boulevard MC 127-72, Pasadena, California 91125, United States
| | - David G. VanderVelde
- Division of Chemistry and
Chemical Engineering, California Institute of Technology, 1200 East
California Boulevard MC 127-72, Pasadena, California 91125, United States
| | - Theodor Agapie
- Division of Chemistry and
Chemical Engineering, California Institute of Technology, 1200 East
California Boulevard MC 127-72, Pasadena, California 91125, United States
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6
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Sattler A, VanderVelde DG, Labinger JA, Bercaw JE. Lewis Acid Promoted Titanium Alkylidene Formation: Off-Cycle Intermediates Relevant to Olefin Trimerization Catalysis. J Am Chem Soc 2014; 136:10790-800. [PMID: 25007394 DOI: 10.1021/ja5055687] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Aaron Sattler
- Arnold and Mabel Beckman
Laboratories of Chemical Synthesis, California Institute of Technology, Pasadena, California 91125, United States
| | - David G. VanderVelde
- Arnold and Mabel Beckman
Laboratories of Chemical Synthesis, California Institute of Technology, Pasadena, California 91125, United States
| | - Jay A. Labinger
- Arnold and Mabel Beckman
Laboratories of Chemical Synthesis, California Institute of Technology, Pasadena, California 91125, United States
| | - John E. Bercaw
- Arnold and Mabel Beckman
Laboratories of Chemical Synthesis, California Institute of Technology, Pasadena, California 91125, United States
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7
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Lenton TN, VanderVelde DG, Bercaw JE. Synthesis of a Bis(thiophenolate)pyridine Ligand and Its Titanium, Zirconium, and Tantalum Complexes. Organometallics 2012. [DOI: 10.1021/om300789h] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Taylor N. Lenton
- Arnold and Mabel
Beckman Laboratories of Chemical Synthesis, California Institute of Technology, Pasadena, California
91125, United States
| | - David G. VanderVelde
- Arnold and Mabel
Beckman Laboratories of Chemical Synthesis, California Institute of Technology, Pasadena, California
91125, United States
| | - John E. Bercaw
- Arnold and Mabel
Beckman Laboratories of Chemical Synthesis, California Institute of Technology, Pasadena, California
91125, United States
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Chartron JW, VanderVelde DG, Rao M, Clemons WM. Get5 carboxyl-terminal domain is a novel dimerization motif that tethers an extended Get4/Get5 complex. J Biol Chem 2012; 287:8310-7. [PMID: 22262836 DOI: 10.1074/jbc.m111.333252] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Tail-anchored trans-membrane proteins are targeted to membranes post-translationally. The proteins Get4 and Get5 form an obligate complex that catalyzes the transfer of tail-anchored proteins destined to the endoplasmic reticulum from Sgt2 to the cytosolic targeting factor Get3. Get5 forms a homodimer mediated by its carboxyl domain. We show here that a conserved motif exists within the carboxyl domain. A high resolution crystal structure and solution NMR structures of this motif reveal a novel and stable helical dimerization domain. We additionally determined a solution NMR structure of a divergent fungal homolog, and comparison of these structures allows annotation of specific stabilizing interactions. Using solution x-ray scattering and the structures of all folded domains, we present a model of the full-length Get4/Get5 complex.
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Affiliation(s)
- Justin W Chartron
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA
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9
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Klet RC, VanderVelde DG, Labinger JA, Bercaw JE. Highly regioirregular polypropylene from asymmetric group 4 anilide(pyridine)phenoxide complexes. Chem Commun (Camb) 2012; 48:6657-9. [DOI: 10.1039/c2cc32806b] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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10
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Wenzel AG, Blake G, VanderVelde DG, Grubbs RH. Characterization and dynamics of substituted ruthenacyclobutanes relevant to the olefin cross-metathesis reaction. J Am Chem Soc 2011; 133:6429-39. [PMID: 21452876 PMCID: PMC3083245 DOI: 10.1021/ja2009746] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The reaction of the phosphonium alkylidene [(H(2)IMes)RuCl(2)=CHP(Cy)(3))](+) BF(4)(-) with propene, 1-butene, and 1-hexene at -45 °C affords various substituted, metathesis-active ruthenacycles. These metallacycles were found to equilibrate over extended reaction times in response to decreases in ethylene concentrations, which favored increased populations of α-monosubstituted and α,α'-disubstituted (both cis and trans) ruthenacycles. On an NMR time scale, rapid chemical exchange was found to preferentially occur between the β-hydrogens of the cis and trans stereoisomers prior to olefin exchange. Exchange on an NMR time scale was also observed between the α- and β-methylene groups of the monosubstituted ruthenacycle (H(2)IMes)Cl(2)Ru(CHRCH(2)CH(2)) (R = CH(3), CH(2)CH(3), (CH(2))(3)CH(3)). EXSY NMR experiments at -87 °C were used to determine the activation energies for both of these exchange processes. In addition, new methods have been developed for the direct preparation of metathesis-active ruthenacyclobutanes via the protonolysis of dichloro(1,3-bis(2,4,6-trimethylphenyl)-2-imidazolidinylidene)(benzylidene) bis(pyridine)ruthenium(II) and its 3-bromopyridine analogue. Using either trifluoroacetic acid or silica-bound toluenesulfonic acid as the proton source, the ethylene-derived ruthenacyclobutane (H(2)IMes)Cl(2)Ru(CH(2)CH(2)CH(2)) was observed in up to 98% yield via NMR at -40 °C. On the basis of these studies, mechanisms accounting for the positional and stereochemical exchange within ruthenacyclobutanes are proposed, as well as the implications of these dynamics toward olefin metathesis catalyst and reaction design are described.
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Affiliation(s)
- Anna G Wenzel
- Joint Science Department, Claremont McKenna, Pitzer, and Scripps Colleges, Claremont, California 91711, USA.
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11
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Eddingsaas NC, VanderVelde DG, Wennberg PO. Kinetics and products of the acid-catalyzed ring-opening of atmospherically relevant butyl epoxy alcohols. J Phys Chem A 2010; 114:8106-13. [PMID: 20684583 DOI: 10.1021/jp103907c] [Citation(s) in RCA: 175] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Epoxydiols are produced in the gas phase from the photo-oxidation of isoprene in the absence of significant mixing ratios of nitrogen oxides (NO(x)). The reactive uptake of these compounds onto acidic aerosols has been shown to produce secondary organic aerosol (SOA). To better characterize the fate of isoprene epoxydiols in the aerosol phase, the kinetics and products of the acid-catalyzed ring-opening reactions of four hydroxy-substituted epoxides were studied by nuclear magnetic resonance (NMR) techniques. Polyols and sulfate esters are observed from the ring-opening of the epoxides in solutions of H(2)SO(4)/Na(2)SO(4). Likewise, polyols and nitrate esters are produced in solutions of HNO(3)/NaNO(3). In sulfuric acid, the rate of acid-catalyzed ring-opening is dependent on hydronium ion activity, sulfate ion, and bisulfate. The rates are much slower than the nonhydroxylated equivalent epoxides; however, the hydroxyl groups make them much more water-soluble. A model was constructed with the major channels for epoxydiol loss (i.e., aerosol-phase ring-opening, gas-phase oxidation, and deposition). In the atmosphere, SOA formation from epoxydiols will depend on a number of variables (e.g., pH and aerosol water content) with the yield of ring-opening products varying from less than 1% to greater than 50%.
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Affiliation(s)
- Nathan C Eddingsaas
- Division of Chemistry, California Institute of Technology, MC 127-72, 1200 East California Boulevard, Pasadena, California 91125, USA.
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12
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Hutt OE, Reddy BS, Nair SK, Reiff EA, Henri JT, Greiner JF, Chiu TL, VanderVelde DG, Amin EA, Himes RH, Georg GI. Total synthesis and evaluation of C25-benzyloxyepothilone C for tubulin assembly and cytotoxicity against MCF-7 breast cancer cells. Bioorg Med Chem Lett 2008; 18:4904-6. [PMID: 18684624 PMCID: PMC7047897 DOI: 10.1016/j.bmcl.2008.07.024] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2008] [Accepted: 07/01/2008] [Indexed: 10/21/2022]
Abstract
The total synthesis of C25-benzyloxy epothilone C is described. A sequential Suzuki-Aldol-Yamaguchi macrolactonization strategy was utilized employing a novel derivatized C8-C12 fragment. The C25-benzyloxy analog exhibited significantly reduced biological activity in microtubule assembly and cytotoxicity assays. Molecular modeling simulations indicated that excessive steric bulk in the C25 position may reduce activity by disrupting key hydrogen bonds that are crucial for epothilone binding to beta-tubulin.
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Affiliation(s)
- Oliver E. Hutt
- Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS 66045, USA
| | - Bollu S. Reddy
- Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS 66045, USA
| | - Sajiv K. Nair
- Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS 66045, USA
| | - Emily A. Reiff
- Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS 66045, USA
| | - John T. Henri
- Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS 66045, USA
| | - Jack F. Greiner
- Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS 66045, USA
| | - Ting-Lan Chiu
- Department of Medicinal Chemistry, and Institute for Therapeutics Discovery and Development, University of Minnesota, 717 Delaware Street SE, Minneapolis, MN 55414, USA
| | - David G. VanderVelde
- Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS 66045, USA
| | - Elizabeth A. Amin
- Department of Medicinal Chemistry, and Institute for Therapeutics Discovery and Development, University of Minnesota, 717 Delaware Street SE, Minneapolis, MN 55414, USA
| | - Richard H. Himes
- Department of Molecular Bioscience, University of Kansas, 1200 Sunnyside Avenue, Lawrence, KS 66045, USA
| | - Gunda I. Georg
- Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS 66045, USA
- Department of Medicinal Chemistry, and Institute for Therapeutics Discovery and Development, University of Minnesota, 717 Delaware Street SE, Minneapolis, MN 55414, USA
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13
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Khalaf JK, VanderVelde DG, Datta A. Synthetic Studies on Ezomycins: Stereoselective Route to a Thymine Octosyl Nucleoside Derivative. J Org Chem 2008; 73:5977-84. [DOI: 10.1021/jo801050r] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Juhienah K. Khalaf
- Department of Medicinal Chemistry, The University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045
| | - David G. VanderVelde
- Department of Medicinal Chemistry, The University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045
| | - Apurba Datta
- Department of Medicinal Chemistry, The University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045
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14
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Barboni L, Giarlo G, Ricciutelli M, Ballini R, Georg GI, VanderVelde DG, Himes RH, Wang M, Lakdawala A, Snyder JP. Synthesis, modeling, and anti-tubulin activity of a D-seco paclitaxel analogue. Org Lett 2004; 6:461-4. [PMID: 14961598 DOI: 10.1021/ol036204c] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text] We have previously described a model of paclitaxel-microtubule binding that led to the prediction that analogues of paclitaxel lacking any D ring could stabilize microtubules as well as paclitaxel if the substituent present at C4 did not have unfavorable steric interactions with the binding pocket. We report the synthesis of a 4-methyl paclitaxel analogue, compound 1, which bears this prediction out. Compound 1 is as potent as paclitaxel at microtubule stabilization in vitro; however, it has only about one-four-hundredth the cytotoxicity of paclitaxel.
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Affiliation(s)
- Luciano Barboni
- Dipartimento di Scienze Chimiche, Università di Camerino, via S. Agostino 1, 62032 Camerino (MC), Italy.
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15
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Koike M, VanderVelde DG, Shapley JR. Solution Structure and Dynamics of (.mu.-H)Os3(CO)10(.mu.-CH3). New 1H and 13C NMR Studies. Organometallics 2002. [DOI: 10.1021/om00016a048] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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