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54.
Jorgina Satrustegui Juan Bautista Alberto Machado 《Molecular and cellular biochemistry》1983,51(2):123-127
Summary The utilization by yeast of two carbon sources is carried out through the operation of the glyoxylic acid cycle. Kinetic data from the isocitrate transforming enzymes suggest that the flow of isocitrate through the glyoxylic acid cycle depends upon the inhibition of the isocitrate decarboxylating enzymes. Both isocitrate dehydrogenases are inhibited by a mixture of glyoxylate + oxaloacetate, but for the reasons described in the text we consider that this inhibition is of no physiological significance. On the other hand, we have found that NADPH is a competitive inhibitor of NADP-isocitrate dehydrogenase with respect to NADP+, with a KI similar to its KM. It also produces an additive effect on the NADH-produced inhibition of NAD-isocitrate dehydrogenase. We propose NADPH as the compound that channels the utilization of isocitrate into the glyoxylic acid cycle. This is supported by the finding of an increased NADPH/NADP+ ratio in acetate grown yeast with respect to glucose grown cells. 相似文献
55.
Júlia Cabrita 《Mycopathologia》1974,54(3):347-360
A critical survey is made of human mycoses diagnosed in European Portugal and in the Portuguese Overseas Provinces. Dermatophyte infections and pityriasis versicolor are commom in the entire territory. The more frequently isolated dermatophytes in Continental Portugal wereTrichophyton violaceum, Microsporum canis, Trichophyton tonsurans andTrichophyton schoenleinii, in the scalp andTrichophyton rubrum, Trichophyton mentagrophytes, Trichophyton megninii andEpidermophyton floccosum in the other body sites. In the Overseas Provinces the species found in white people were very much the same, whereas in negroes mainlyMicrosporum audouinii andT. violaceum in Mozambique,M. audouinii in Angola, andTrichophyton soudanense, M. audouinii andT. rubrum in Guinea were identified.In Continental Portugal cases of candidiasis, mycetoma, aspergillosis, sporotrichosis and cryptococcosis were described in patients who had never been outside Europe; and tinea nigra, African histoplasmosis and South-American blastomycosis in individuals who live or lived in India, Africa and Brazil.The first case of North-American blastomycosis was reported in Mozambique. 相似文献
56.
A Alvarez U Hidalgo M E Kawada A Munizaga A Zú?iga L Ibánez C S Koenig M J Santos 《Analytical biochemistry》1992,206(1):147-154
This paper shows the successful isolation of peroxisomes from human liver samples that were kept frozen at -70 degrees C. Purification of these peroxisomes was obtained by a combination of two subcellular fractionation techniques: differential centrifugation and isopycnic fractionation in Nycodenz density gradients. Peroxisome integrity was evaluated by latency measurements and by ultrastructural observation. The procedure described here may be useful for the isolation of other subcellular organelles from frozen human samples. 相似文献
57.
B Teutsch C Bihoreaú C Monnot K E Bernstein T J Murphy R W Alexander P Corvol E Clauser 《Biochemical and biophysical research communications》1992,187(3):1381-1388
A rat vascular AT1 receptor cDNA has been stably expressed into Chinese Hamster Ovary cells and the resulting recombinant AT1a receptor has been functionally characterized. This receptor binds 125I Sar1-angiotensin II with an affinity of 0.9 nM and the displacement of this ligand by a series of peptidic and nonpeptidic analogs is shown. Binding of angiotensin II to this receptor causes a rapid increase in inositol phosphate production, whereas this effect is not observed in nontransfected cells. Des-aspartyl1 angiotensin II and at a lesser extent angiotensin I are also able to produce an increase in inositol phosphates. More importantly, the actions of angiotensin II on cell division were clearly demonstrated in this model, since angiotensin II is able to stimulate DNA synthesis by 400% and double the cell population of the transfected cells in 36 hours in the absence of any other growth factor, whereas no effect is observed in nontransfected cells. 相似文献
58.
The Na+/Ca2+ exchanger of squid axons, barnacle muscle and sarcolemma requires micromolar intracellular calcium for activation in the Na+i/Ca2+o exchange mode ('reverse' Na+/Ca2+ exchange). The requirement for [Ca2+]i has been demonstrated with the use of intracellular calcium buffers, such as Quin-2, to inhibit Na+i/Ca2+o exchange. However, the inhibition of Na+i/Ca2+o exchange in mammalian nerve terminals loaded with Quin-2 has not been observed [7], suggesting a lower sensitivity to low [Ca2+]i for this system. In contrast, the results reported herein indicate that 45Ca2+ uptake in synaptosomes through Na+i/Ca2+o exchange is inhibited by Quin-2 much in the same way as it is in the squid, provided that synaptosomes are preincubated in low Ca2+ medium to avoid saturation of Quin-2. Under these conditions, 45Ca2+ efflux via Ca2+i/Ca2+o exchange is also inhibited. Our results indicate that the Na+i/Ca2+o and Ca2+i/Ca2+o modes of the Na+/Ca2+ exchanger from rat brain synaptosomes require intracellular calcium for activation. However, because no clear relationship between the observed [Ca2+]i values and the inhibition of Na+i/Ca2+o exchange has been found, it is suggested that localised submembrane calcium concentrations not detected by the [Ca2+]i probe might regulate the exchanger. 相似文献
59.
Francisco Guillén Angel T. Martinez Maria Jesús Martínez 《Applied microbiology and biotechnology》1990,32(4):465-469
Summary Production of extracellular hydrogen peroxide by fungal oxidases is been investigated as a requirement for lignin degradation. Aryl-alcohol oxidase activity is described in extracellular liquid and mycelium ofPleurotus eryngii and studied under non-limiting nitrogen conditions. This aryl-alcohol oxidase catalyses conversion of primary aromatic alcohols to the corresponding aldehydes and H2O2, showing no activity with aliphatic and secondary aromatic alcohols. The enzyme is stable at pH 4.0–9.0, has maximal activity at 45°–50°C and pH 6.0–6.5, is inhibited by Ag+, Pb2+ and NaN3, and has aK
m
of 1.2 mM using veratryl alcohol as substrate. A single protein band with aryl-alcohol oxidase activity was found in zymograms of extracellular and intracellular crude enzyme preparations fromP. eryngii. 相似文献
60.
Palmaria decipiens, one of the most abundant red seaweeds of the chilean Antarctic, was collected in King George Island. The hot water extract (26% yield) showed by acid hydrolysis to contain xylose, galactose and traces of glucose. Fractionation with cetrimide gave a soluble neutral xylan and an insoluble fraction. The insoluble fraction afforded an acidic polysaccharide that contained 4.8% of uronic acids, 2.8% of sulfate and 18.9% of protein. Polyacrylamide gel electrophoresis showed that it was homogeneous. The GLC and HPLC analysis of the total acidic hydrolysis products showed that the acidic polysaccharide was composed of the neutral sugars galactose and xylose in the molar ratio 8.2:1.0 and of galacturonic and glucuronic acid in the ratio 1.5:1.0. The second-derivative FT-IR spectrum showed the characteristic amide I, II and III bands of proteins. Alkaline cleavage with 0.1 M NaOH indicated the presence of a glycoprotein with O-glycosidic linkage.Results found in this work suggest that the acidic polysaccharide extracted from Palmaria decipiens is an acidic xylogalactan-protein complex. 相似文献