Supplementary MaterialsTransparent reporting form
Supplementary MaterialsTransparent reporting form. PI(4,5)P2 activation of exocytosis didn’t depend on the PI(4,5)P2-binding CAPS-proteins, suggesting that PI(4,5)P2 uncaging may bypass CAPS-function. Finally, PI(4,5)P2 uncaging triggered the rapid fusion of a subset of readily-releasable vesicles, revealing a rapid role of PI(4,5)P2 in fusion triggering. Thus, optical uncaging of signaling lipids can uncover their rapid effects on cellular processes and identify lipid effectors. values are given in Hz and chemical shifts were measured in ppm. Deuterated solvents were obtained from Deutero GmbH, Karlsruhe, Germany. Splitting patterns are designated as follows: s, singlet; d, doublet; t, triplet; q, quartet; m, multiplet; b, broad. 13C- and 31P-spectra were broadband proton decoupled. Mass spectra (ESI) were recorded using a Waters Micromass ZQ mass spectrometer. High-resolution mass spectra were recorded at the University of Heidelberg on a HP ICR Apex-Qe mass spectrometer. Masses are given as m/z. Melting points were determined on a Buechi Mouse monoclonal to SLC22A1 B-540 and are uncorrected. Synthesis of head group 10a,b Chemical structure 1. Open in a separate window Synthesis of head group 10a,b. Reagents and conditions: (a) CH2Cl2:HCO2H 4:1, rt, 3 hr, 88%; (b) (FmO)2P-N em i /em Pr2 7 (Mentel et al., 2011), 1 em H /em -tetrazole, CH2Cl2, rt, 1 hr, then AcO2H, ?80C-rt, 1 hr, 83% over two steps; (c) (Coum)(FmO)P-N em i /em Pr2 8 (Subramanian et al., 2010), 1 em H /em -tetrazole, CH2Cl2, rt, 1 hr, then AcO2H, ?80C-rt, 1 hr, 79%; (d) CH2Cl2:HCO2H 1:19, rt, 6 hr; (e) Pr-C(OMe)3, CH2Cl2, JandaJel pyridinium trifluoroacetate, rt, 23 hr, 37.5% over five actions predicated on 3. 3,6-Di-O-butyryl-1,2-O-isopropylidene-myo-inositol 5 3,6-Di- em O /em -butyryl-1,2:4,5-di- em O-iso /em propylidene- em myo /em -inositol 3 (801 mg, 2 mmol) was dissolved in dichloromethane:formic acidity (4:1, 16 mL) at 25C with stirring. After 4 hr, the perfect solution is was diluted with dichloromethane (100 mL) and cleaned with phosphate buffer (pH 7, 150 mL). The pH from the aqueous stage was modified to 6C7 from the cautious addition of saturated sodium bicarbonate option (~95 mL). The aqueous coating was extracted double with dichloromethane (2 100 mL), the pooled organic stages had been dried Lipoic acid (Na2SO4), evaporated and filtrated less than decreased pressure. The solid residue acquired was dried out at 0.2 mbar to provide the title substance (633 mg, 87.8%) like a white good. 1H NMR (400 MHz, CDCl3) ?=?5.10 (dd, em J /em ?=?10.3, 7.7, 1H, ins H-6), 5.02 (dd, em J /em ?=?10.1, 4.0, 1H, ins H-3), 4.47 (t, em J /em ?=?4.4 Hz, 1H, ins H-2), 4.14 (dd, em J /em ?=?7.6, 4.9 Hz, 1H, ins H-1), 4.01 (t, em J /em ?=?9.7 Hz, 1H, ins H-4), 3.42 (t, em J /em ?=?9.8 Hz, 1H, ins H-5), 2.76 (s, 1H, OH), 2.73 (s, 1H, OH), 2.43 (t, em J /em ?=?7.4, 2 H, -CH2), 2.39 (t, em J /em Lipoic acid ?=?7.5 Hz, 2H, -CH2), 1.79C1.64 (m, 4H, 2 x -CH2), 1.56 (s, 3H, CH3 ketal), 1.32 (s, 3 H, CH3 ketal), 0.97 (t, em J /em ?=?7.4, 3H, -CH3), 0.96 (t, em J /em ?=?7.4, 3 hr, -CH3). 13C NMR (101 MHz, CDCl3) ?=?173.98, 173.66, 110.63, 76.47, 75.14, 73.82, 72.47, 70.99, 70.92, 36.16, 36.01, 27.79, 26.03, 18.46, 18.36, 13.52, 13.48. TR80% methanol?=?2.2 min. Mp108C110C. HR-MS (ESI positive) determined C17H29O8 m/z 361.18569, found 361.18588 [M?+?H]+.Rosahl 3,6-Di-O-butyryl-4(5)-O-bis(9H-fluoren-9-ylmethyl)phosphoryl-1,2-O-isopropylidene-myo-inositol (combination of 4-O- and 5-O- isomers with regards to the position from the caged phosphate) 6a,b 3,6-Di- em O /em -butyryl-1,2- em O-iso /em propylidene- em myo /em -inositol 5 (900 mg, 2.5 mmol) is subsequently evaporated with acetonitrile (5 mL) and 1 em H /em -tetrazole solution in acetonitrile (11 mL, 5 mmol,~0.45 M). The rest Lipoic acid of the solids had been suspended in anhydrous dichloromethane (15 mL) and a remedy of bis-(9 em H /em -fluoren-9-ylmethyl)- em Lipoic acid N,N /em -di em iso /em propylphosphoramidite 7 (1.25 g, 2.4 mmol) in dichloromethane (5 mL) was added. The blend was stirred for 1 hr at 24C. After chilling to ?80C (acetone/water nitrogen), peracetic acidity solution (610 L, 3.6 mmol, 39% in 45% acetic acidity) was added. The chilling bath was eliminated and stirring continuing for 1 hr. The perfect solution is was diluted with dichloromethane (50 mL) and poured into stirring phosphate buffer (pH 7, 200 mL). The pH was modified to neutral from the cautious addition of saturated sodium bicarbonate option. The organic coating was separated, cleaned with phosphate buffer (pH 7, 100 mL), dried out (Na2Thus4), focused and filtrated less than decreased pressure to provide 1.84 g of the white foam. The crude item was purified by chromatography on the column of silica gel 60 (20 3 cm) with 1. dichloromethane:cyclohexane 1:5 (300 mL), 2. 1:3 (100 mL), 3. 1:1, four ethyl acetate:methanol 9:1 (400 mL). Another chromatography with 1. dichloromethane:methanol 1:0 (1 L), 2. 98:2 (100 mL), 3. 96:4 (100 mL), 94:6 (100 mL), 92:8 (100 mL) afforded the name compound mainly because white foam (1.58 g, 82.7%). TR100% methanol?=?3.7 min. 1H NMR (400 MHz, CDCl3) ?=?7.82C7.12 (m,.