共查询到20条相似文献,搜索用时 9 毫秒
1.
2.
19-Hydroxyandrostenedione (19-OHA), highly labeled with deuterium at position 7, was synthesized from unlabeled androstenediol diacetate. The deuterium labels were introduced into the 7-keto compound with dichloroaluminum deuteride to obtain [7-2H2]androstenediol. The labeled androstenediol diacetate was converted to the labeled 19-OHA by a five-step sequence without appreciable loss of deuterium. The labeled 19-OHA is useful as an internal standard for gas chromatography-mass spectroscopy analysis of the endogenous levels and as a tracer for in vivo metabolic studies. 相似文献
3.
4.
S. Partanen 《The Histochemical journal》1984,16(5):501-506
Summary A new, direct-colouring, metal precipitation method for the light microscopical demonstration of arylsulphatases A and B is described. It is based on the reducing capacity of nitrocatechol liberated by arylsulphatases fromp-nitrocatechol sulphate. The reaction is carried out in Karnovsky-Roots' copper ferricyanide incubation mixture at pH 5.0 or 5.5; the nitrocatechol liberated reduces ferricyanide to ferrocyanide, which in turn forms a brown precipitate with copper that indicates enzyme activity. Enzyme activity was localized in cytoplasmic particles compatible with a lysosomal localization of the enzyme. The histochemical reaction was inhibited by phosphate, which has been shown to inhibit arylsulphatases A and B in biochemical determinations. The method described is technically simple, and sections can be mounted in synthetic resin after dehydration. 相似文献
5.
《Mutation Research Letters》1995,346(3):181-186
This is the first report of clastogenic effects of chlorinated hydroxyfuranones (CHFs) in plants. Two byproducts of water chlorination, 3-chloro-4-(dichloromethyl)-5-hydroxy-2[5H]-furanone (MX) and 3,4-dichloro 5-hydroxy-2[5H]-furanone (MA) induced a dose dependent increase of micronuclei (MN) in pollen mother cells of Tradescantia when doses up to 100 μg MX and 500 μg MA were applied directly to the inflorescences. In contrast, exposure of the stems in aqueous solutions containing up to 1 mg/I MX and 10 mg/I MA did not cause a positive response. 相似文献
6.
Jean Guillon Maria Mamani-Matsuda Stephane Massip Jean-Michel Leger Denis Thiolat Djavad Mossalayi 《Journal of enzyme inhibition and medicinal chemistry》2013,28(6):391-396
The synthesis of new 7-hydroxy-2-substituted-methyl-5 H -oxazolo[3,2- a] pyrimidin-5-ones derivatives, designed as structural bicyclic analogues of the iron chelator deferiprone, is described. They were tested for their ability to inhibit proliferation in human Bcr-Abl + leukemia cells. 相似文献
7.
8.
9.
《Journal of lipid research》2018,59(7):1132-1147
10.
Guillon J Mamani-Matsuda M Massip S Leger JM Thiolat D Mossalayi D Jarry C 《Journal of enzyme inhibition and medicinal chemistry》2002,17(6):391-396
The synthesis of new 7-hydroxy-2-substituted-methyl-5H-oxazolo[3,2-a]pyrimidin-5-ones derivatives, designed as structural bicyclic analogues of the iron chelator deferiprone, is described. They were tested for their ability to inhibit proliferation in human Bcr-Abl+ leukemia cells. 相似文献
11.
《Biochimica et Biophysica Acta (BBA)/General Subjects》2017,1861(8):2119-2131
Members of the monothiol glutaredoxin family and members of the BolA-like protein family have recently emerged as specific interacting partners involved in iron-sulfur protein maturation and redox regulation pathways. It is known that human mitochondrial BOLA1 and BOLA3 form [2Fe-2S] cluster-bridged dimeric heterocomplexes with the monothiol glutaredoxin GRX5. The structure and cluster coordination of the two [2Fe-2S] heterocomplexes as well as their molecular function are, however, not defined yet. Experimentally-driven structural models of the two [2Fe-2S] cluster-bridged dimeric heterocomplexes, the relative stability of the two complexes and the redox properties of the [2Fe-2S] cluster bound to these complexes are here presented on the basis of UV/vis, CD, EPR and NMR spectroscopies and computational protein-protein docking. While the BOLA1-GRX5 complex coordinates a reduced, Rieske-type [2Fe-2S]1+ cluster, an oxidized, ferredoxin-like [2Fe-2S]2+ cluster is present in the BOLA3-GRX5 complex. The [2Fe-2S] BOLA1-GRX5 complex is preferentially formed over the [2Fe-2S] BOLA3-GRX5 complex, as a result of a higher cluster binding affinity. All these observed differences provide the first indications discriminating the molecular function of the two [2Fe-2S] heterocomplexes. 相似文献
12.
Martin A. Perry Gillian M. Powell Frederick S. Wusteman C. Gerald Curtis 《The Biochemical journal》1977,166(3):373-379
The metabolic fate of heparan N-[(35)S]sulphate was studied in rats. Heparan sulphate was obtained from either bovine aorta or lung and labelled with (35)S by desulphation and subsequent resulphation in vitro. Experiments in which heparan N-[(35)S]sulphate was administered intravenously to either free-range or wholly anaesthetized rats with ureter cannulae established that substantial desulphation occurs in vivo, with elimination of inorganic [(35)S]sulphate in urine. Oligosaccharides labelled with (35)S, possible intermediates in heparan sulphate degradation, could not be detected in urine or blood. The general distribution of radioactivity after administration of heparan N-[(35)S]sulphate, as demonstrated by whole-body radioautography, suggested that desulphation was not restricted to one organ in particular. Support for this view was obtained in experiments in which heparan N-[(35)S]sulphate was administered to animals after the removal of kidneys, liver, spleen, pancreas or gastrointestinal tract. In all cases inorganic [(35)S]sulphate was still produced. The ability of rats of desulphate heparan N-[(35)S]sulphate was progressively impaired by increasing concentrations of heparin administered simultaneously. It was concluded that heparan sulphate is metabolized at a number of sites in the body by a sequence of degradative events leading to the formation of inorganic sulphate. It is also concluded that at least some of these events are common to heparan sulphate and heparin. 相似文献
13.
14.
15.
16.
17.
The effect of pH on the kinetics of rat liver arylsulphatases A and B is very similar and shows that two groups with pK values of 4.4-4.5 and 5.7-5.8 are important for enzyme activity. Substrate binding has no effect on the group with a pK of 4.4-4.5; however, the pK of the second group is shifted to 7.1-7.5 in the enzyme-substrate complex. An analysis of the effect of pH on the Ki for sulphate inhibition suggests that HSO4-is the true product. A model is proposed that involves the two ionizing groups identified in the present study in a concerted general acid-base-catalysed mechanism. 相似文献
18.
本文报道了[B1~Ala,B2-Ala]-胰岛素与人胎盘细胞膜胰岛素受体结合的特性和体外生物活力,并与胰岛素进行比较。在37℃和杆菌肽存在下,125I-[B1-Ala,B2-Ala]-胰岛素和125I-胰岛素与人胎盘细胞膜作用依赖于反应时间,反应6分钟到达平衡,此时,[B1-Ala,B2-Ala]-胰岛素和胰岛素与胰岛素受体的最大结合分别为每毫克膜蛋白结合6.44fmol和3.47fmol:达到平衡一半所需时间(T1/2)分别为19秒和25秒。用125I-[B1-Ala,B2-Ala]-胰岛素作为放射配体进行竞争性结合研究,从IC(50)得[B1-Ala,B2-Ala]胰岛素的受体结合活力为胰岛素的139.6%。Scatohard分析求得;[B1-Ala,B2-Ala]-胰岛素与高亲和和低亲和结合位点的结合常数在4℃时分别为5.88×108L/mol和7.63×105L/mol,而胰岛素分别为4.83×108L/mol和3.39×105L/mol。促脂肪细胞生成脂的实验表明:[B1-Ala,B2-Ala]-胰岛素的活力为胰岛素的130%。 相似文献
19.
Synthesis of 2-chloro-4-nitrophenyl alpha-L-fucopyranoside: a substrate for alpha-L-fucosidase (AFU)
An effective method to prepare the substrate of alpha-L-fucosidase (AFU) is described. Ethyl 1-thiofucoside with a free 2-OH group was used as the glycosyl donor, and there was found no self-condensed side product. The use of the HF.pyridine reagent to remove the silyl protecting group in the last step afforded a target molecule of high purity. 相似文献
20.