A Stereoselective and Highly Practical Synthesis of Cytosolic Phospholipase A2 Substrate, 2-S-Arachidonoyl-1-O-hexadecyl-sn-2-thioglycero-3-O-phosphocholine
摘要:
The substrate 1 of cytosolic phospholipase A(2) (cPLA(2)) is an ether-type thiophospholipid with arachidonic acid at the C-2 position and is required for the chromogenic assay for reliable and convenient high throughput screening. The original method of synthesis of 1 has significant problems, resulting in extremely low overall yield and purity. We developed a novel and highly practical method of preparing sufficient quantities of pure 1 for assay. Our synthetic sequence is started with commercially available 1,2-O-isopropylidene-sn-grycerol (5) and is based on the following key steps: trityl migration reaction of 10 with boron trifluoride etherate to form 13, phosphocholine-forming reaction of 13 to yield 15, and efficient conversion of 15 into 1 by deprotection of a trityl group and condensation with arachidonic acid. Our method offers a practical means of large-scale production of 1 with excellent high chemical purity, because of the introduction of arachidonic acid at the last step of the synthetic sequence.
作者:Judith E. Browne、Richard T. Freeman、Jeremy C. Russell、Peter G. Sammes
DOI:10.1039/a910266n
日期:——
Several structural analogues of the biocompatible diacyl glycerol phosphatidylcholine family have been prepared. Considerable variation in structure is allowed without impairing the desirable biocompatible properties. In particular, derivatives in which the fatty ester link is replaced by ether links and in which the central glycerol group is replaced by simple variants such as the symmetrical tris(hydroxymethyl)ethane group retain biocompatible properties.
For the purpose of carrying out smoothly enzymatic reaction of water-insoluble substrates in organic solvents, a new type of immobilized enzyme, a lipid-lipase aggregate, was developed. In order to prepare various kinds of lipid-lipase aggregates, 27 kinds of dialkyl ether-type phospholipid analogues were newly synthesized and used for the preparation of aggregates with lipase. Thus obtained lipid-lipase aggregates were found to catalyze the enantioselective hydrolysis of the (±)-α-acyloxy ester 2 much more efficiently than lipase immobilized with synthetic prepolymer (ENTP-4000) in water-saturated isopropyl ether. Namely. the reaction time became much shorter (2 to 3d for completion as compared with 21 d) and the chemical and optical yields of the reaction products were found to be high.
[EN] BIPOLAR TETRAETHER LIPIDS<br/>[FR] LIPIDES BIPOLAIRES DE TYPE TÉTRAÉTHER
申请人:UNIV CALIFORNIA
公开号:WO2017040702A1
公开(公告)日:2017-03-09
Disclosed herein, inter alia, are compounds, compositions, and liposomes and methods of thereof.
披露的内容包括但不限于化合物、组合物、脂质体及其方法。
Compounds for determining the activity of phospholipase A2
申请人:Sirs-Lab GmbH
公开号:US07301043B2
公开(公告)日:2007-11-27
Compounds for determining the activity of phospholipase A2, are described herein, and include embodiments having formula (1)
wherein
L1 is derived from an ether (R1—OR2)m, wherein R1 and R2 are independently selected and are derived from a hydrocarbon having 1 to 12 carbon atoms, with m being an integer from 1 to 4, or from a hydrocarbon R having 1 to 20 carbon atoms;
F is unsubstituted or substituted pyrene as a flouraphore;
Q is a quencher, and
L2 is C(O)-L1 or C(O)-L1-NH, wherein L1 is as defined above. These compounds may be used to determine the activity of phospholipase A2, in particular PAF-AH.
Hybrid Lipids Inspired by Extremophiles and Eukaryotes Afford Serum‐Stable Membranes with Low Leakage
作者:Takaoki Koyanagi、Kevin J. Cao、Geoffray Leriche、David Onofrei、Gregory P. Holland、Michael Mayer、David Sept、Jerry Yang
DOI:10.1002/chem.201701378
日期:2017.5.17
strategy (lipid tethering or cholesterol incorporation) to increase membrane integrity. Molecular dynamics simulations reveal that tethering of lipid tails and integration of cholesterol both reduce the disorder in lipid tails and time-dependent variance in area per lipid within a membrane, leading to tighter lipid packing. These hybridlipidmembranes have exceptional stability in serum, yet can support