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排序方式: 共有195条查询结果,搜索用时 156 毫秒
1.
The effects of the local anesthetic dibucaine on coupling between electron transport and ATP synthesis-hydrolysis by the coupling-factor complex (CF0CF1 ATPase) were investigated in thylakoid membranes from Spinacia oleracea L. cv. Monatol. Evidence is presented that inhibition of ATP synthesis was produced by a specific uncoupling mechanism which was based on dibucaine-membrane surface interactions rather than on the interaction of dibucaine with the ATPase complex. Dibucaine reduced the osmotic space of thylakoid vesicles. At low pH of the medium it stimulated ATP hydrolysis beyond the rates obtained with optimum concentrations of ‘classical’ uncouplers. After addition of dibucaine, there was displacement of membrane-bound Mg2+ and strong thylakoid stacking in the presence of only low Mg2+ concentrations. Inhibition of ATP synthesis and transmembrane pH gradient increased with medium pH. Hydrolysis of ATP by isolated CF1 and the CF0CF1 complex was only slightly affected by dibucaine. The data are discussed assuming the involvement of localized proton channels on the membrane surface in protonic coupling of electron transport and ATP synthesis. A hypothesis for the mechanisms of action of local anesthetics at the thylakoid membrane is presented. 相似文献
2.
Lorne J. Brandes Mark W. Hermonat 《Biochemical and biophysical research communications》1984,123(2):724-728
A new para-diphenylmethyl derivative, N,N-diethyl-2-[(4-phenylmethyl)-phenoxy]-ethanamine·HCl (N,N-DPPE) has been synthesized which binds with high affinity to the anti-estrogen binding site found in male rat liver microsomes. However, no evidence of significant interaction with the estrogen receptor can be observed at or below 10 μM in rat uterine cytosols; 10 nM N,N-DPPE fails to significantly induce progesterone receptor in MCF-7 cells. Tamoxifen also binds to anti-estrogen binding site but, unlike N,N-DPPE, binds significantly to estrogen receptor at much loeer concentrations and induces MCF-7 progesterone receptor. This property of high affinity for anti-estrogen binding site but not for estrogen receptor may make N,N-DPPE an important probe for the study of anti-estrogen binding site and its biological relevance. 相似文献
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Wen-Zong Whong 《Mutation research》1979,60(3):301-312
The nature of the N2 effect for ICR-170, i.e., the greater mutagenic and lethal activities of this agent in the presence of N2 than O2, has been studied at the ad-3 region of Neurospora crassa. The characteristics of the N2 effect for ICR-170 were that (1) the N2 effect with ICR-170 was displayed in conidia when N2 was administered during, but not before or after, ICR-170 treatment, (2) the highly increased mutagenic and lethal activities of ICR-170 in the presence of N2 were due to an anoxic condition rather than to the presence of N2 per se, (3) the high killing activity of ICR-170 under N2 was due largely to increased cytoplasmic inactivation, (4) the N2 effect was a general phenomenon at the ad-3 region of N. crassa, and (5) the highly ICR-170-induced mutation in conidia under N2 was attributable to an actual enhancement in the mutagenic activity of ICR-170 rather than to selective killing. With regard to the mechanisms of the N2 effect with ICR-170, results indicate that this effect (1) was not due to more extracellular oxidative degradation of ICR-170 molecules in the presence of O2, or to a greater uptake of ICR-170 by conidia under N2, but (2) was due to the inhibition of conidial respiration under an anoxic environment. 相似文献
5.
The synthesis of benzylpenicillin (BP) after mixing phenyl-acetyl-glycine(PAG), 6-aminopenicillanic acid (6-APA) and free or immobilized penicillin amidase (E.C.3.5.1.11.) was studied as a function of pH and ionic strength. Before the final equilibrium was reached a kinetically controlled synthesis of BP was observed. Then a transient maximum concentration in BP much larger than the final equilibrium content was synthesized in the acyl-transfer process. The factors influencing this maximum have been analyzed. Increasing ionic strength markedly decreased the maximum in BP and the rate of deacylation of phenyl-acetyl-penicillin amidase by 6-APA. The change was largest when the enzyme was immobilized in a positively charged support, where at low ionic strength the concentration of 6-APA around the enzyme is larger than the bulk concentration due to the partitioning of charged solutes. 相似文献
6.
Variation between mouse major urinary protein genes isolated from a single inbred line 总被引:13,自引:0,他引:13
We describe ten Charon 4A genomic DNA clones from BALB/c mice which include at least seven different major urinary protein (MUP) genes. We have established the orientation of all seven sequences, and have placed six of them in precise register by means of restriction site maps and Southern blot hybridization with cloned cDNA sequences. Four of the seven genomic sequences (family I sequences) form hybrids with six independent cDNA clones that have a high thermal stability and hybridize more strongly with mRNA from three inbred mouse lines. Hybrids between the remaining three genomic sequences and the cDNA clones have a lower thermal stability and hybridize less strongly with mRNA from the three inbred lines. Homologies between different cloned sequences extend over as much as 15 kb. No clone contains parts of two MUP genes, and no homology has been detected between the 3' flanking region of one MUP gene and the 5' flanking region of another. 相似文献
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The effects of pentobarbitone on the transport of 45Ca2+ by rat brain mitochondria were studied, using the Ruthenium Red-EGTA quench technique. In the presence of succinate and inorganic phosphate, mitochondria rapidly accumulate 45Ca2+. Pentobarbitone (0.1-1.0 mM) stimulates the initial rate of Ca2+ transport. In contrast, pentobarbitone (1 mM) did not affect the NaCl (50 mM)-induced efflux of 45Ca2+ from mitochondria. Dibucaine (60 micro M), a clinically used local anaesthetic, inhibits both 45Ca2+ uptake an efflux. The results suggest that barbiturate stimulation of mitochondrial Ca2+ uptake may, in combination with effects on other Ca2+ sequestering processes, contribute to the inhibitor of transmitter release observed at a number of synapses. 相似文献
10.
Jolanta Krudysz-Amblo Mark E. Jennings II Tyler Knight Dwight E. Matthews Kenneth G. Mann Saulius Butenas 《Biochimica et Biophysica Acta (BBA)/General Subjects》2013