Determinants of pH profile and acyl chain selectivity in lysosomal phospholipase A2 [S]
作者:Vania Hinkovska-Galcheva、Robert Kelly、Kelly A. Manthei、Renee Bouley、Wenmin Yuan、Anna Schwendeman、JohnJ.G. Tesmer、James A. Shayman
DOI:10.1194/jlr.m084012
日期:——
Lysosomal phospholipaseA2 (LPLA2) is characterized by broad substrate recognition, peak activity at acidic pH, and the transacylation of lipophilic alcohols, especially N-acetyl-sphingosine. Prior structural analysis of LPLA2 revealed the presence of an atypical acidic residue, Asp13, in the otherwise hydrophobic activesite cleft. We hypothesized that Asp13 contributed to the pH profile and/or substrate
Positional specificity of lysosomal phospholipase A2
作者:Akira Abe、Miki Hiraoka、James A. Shayman
DOI:10.1194/jlr.m600183-jlr200
日期:2006.10
5-fold higher than that of 1-O-palmitoyl-NAS. Thus, Lpla2 can act on acylgroups at both sn-1 and sn-2 positions of POPC and OPPC. When 1-palmitoyl-2-unsaturated acyl-sn-glycero-3-phosphocholines were used as acyl donors, the transacylation of the acylgroupfrom the sn-2 position to NAS was preferred to that of the palmitoyl groupfrom the sn-1 position. An exception was observed for 1-palmitoyl-2-ar
申请人:Centre National de la Recherche Scientifique
(CNRS)
公开号:EP2444464A1
公开(公告)日:2012-04-25
The instant invention concerns
- a method for preparing a material comprising the following steps of a) treating the support to obtain a layer having SiH function, b) grafting the SiH layer obtained in step a) with an alkene and a catalyst for covalently bonding the alkene to the coating, said alkene being non-terminal and/or having an hydrophilic part, and c) recovering a material comprising a support coated with a chain covalently grafted with Si-C bonds,
- a material comprising a support, optionally comprising a polyhydrosiloxane layer, on which surface is covalently bonded a grafted chain, wherein the covalent bonding between the support and/or the polyhydrosiloxane and the chain is an Si-C bond, and the grafted chain is bonded through a non-terminal carbon, through more than one covalent bond and/or the chain is having at least one hydrophilic part, and
- devices comprising such material.
本发明涉及
- 一种制备材料的方法,包括以下步骤 a) 处理支持物以获得具有 SiH 功能的层;b) 将步骤 a) 中获得的 SiH 层与烯烃和催化剂接枝,以将烯烃共价键合到涂层上,所述烯烃为非末端烯烃和/或具有亲水部分;以及 c) 回收一种材料,该材料包括涂有共价键合的 Si-C 键接枝链的支持物、
- 一种材料,包括支撑体,可选择包括聚氢硅氧烷层,在支撑体表面共价键合了一条接枝链,其中支撑体和/或聚氢硅氧烷与链之间的共价键合是 Si-C 键,接枝链通过非末端碳键、通过一个以上的共价键和/或链具有至少一个亲水部分键合,以及
- 包括这种材料的装置。
System for collecting animal semen and method for collecting animal semen using such a system
申请人:IMV TECHNOLOGIES
公开号:US10195009B2
公开(公告)日:2019-02-05
The invention concerns a system for collecting animal semen, comprising a container (3) configured to be mounted on an end (9) of an artificial vagina (2), having an internal space (15) configured to receive said semen and configured to comprise a first dilution extender (5) before receiving said semen, and said system (1) comprises a collecting device (4) configured to be at least partially inserted into said container and to be fastened to said vagina, and being interposed between said vagina and said container, said collecting device comprising a flow channel (23) for said semen extending within said internal space of said container and a discharge aperture (26) for said semen open to said internal space; and said system is configured to prevent, at least for the most part, said first dilution extender from passing in said flow channel of said collecting device.
Oxidatively Truncated Docosahexaenoate Phospholipids: Total Synthesis, Generation, and Peptide Adduction Chemistry
作者:Xiaorong Gu、Mingjiang Sun、Bogdan Gugiu、Stanley Hazen、John W. Crabb、Robert G. Salomon
DOI:10.1021/jo026721t
日期:2003.5.1
The recent immunological detection of extraordinarily high levels of carboxyethylpyrrole (CEP) modifications of proteins from the retinas of individuals with age-related macular degeneration provided presumptive evidence for the involvement of docosahexaenoate-derived oxidatively truncated phospholipids in retinal pathology. To facilitate the in vivo detection and characterization of the chemistry and biological activities of these postulated naturally occurring molecules, a family of oxidatively truncated phospholipids was prepared by total syntheses. Their formation in oxidation reactions of a docosahexaenoate ester of 2-lysophosphatidylcholine (DHA-PC) was also demonstrated. Free radical-induced oxidative cleavage of DHA-PC promoted by myeloperoxidase or copper ions generates similar mixtures of these phospholipids. The most abundant products were 1-palmitoyl-2-succinoyl-sn-glycero-3-phosphatidylcholine (4.7%) and 2-(6-carboxy-4-oxohex-5-enoyl)-1-palmitoylsn-glycero-3-phosphatidylcholine (1.7%). Both of these oxidatively truncated phospholipids are homologues of biologically active arachidonate-derived phospholipids. A minor product from DHA-PC, 2-(4-hydroxy-7-oxohept-5-enoyl)-1-palmitoyl-sn-glycero-3-phosphatidylcholine (0.4% yield), reacted with the 6-amino group of a peptide lysyl residue to produce a CEP derivative in 0.7% yield. These observations support the previous conclusion, based on immunological evidence, that CEPs are generated by the reaction of an oxidatively truncated phospholipid with proteins in the retina and further indicate that CEP protein modifications probably represent only a tiny fraction of the products generated upon oxidative damage of DHA-PC in photoreceptor disk membranes.