Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: EC:1.6.5.2 (NQO1)
 6,196 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

1. Pig heart lipoamide dehydrogenase (NADH: lipoamide oxidoreductase, EC 1.6.4.3) has been immobilised to Sepharose by thiol-disulphide interchange via a series of thiolated spacer molecules of increasing length. A number of properties of the immobilised enzyme have been investigated in order to ascertain the effects of proximity to the matrix backbone. 2. Proximity to the matrix backbone reduced the specific activity for lipoamide as substrate but enhanced by 3-8-fold the diaphorase activity with 2,6-dichloroindophenol. These observations are explained in part by an increase in the apparent Km for lipoamide when the enzyme is covalently attached to Sepharose via a short spacer molecule. 3. Both the thermal stability at 90 degrees C and the stability in 30% (v/v) dioxane are enhanced by up to 200% when the enzyme resides close to the matrix but approach those of the native enzyme as the length of the spacer molecule is increased. 4. These data have been correlated with measures of the accessibility of the enzyme as the nominal length of the spacer arm was increased. Thus, as the chain length increased, the rate of cleavage of the disulphide linkage between the enzyme and spacer increased and the enzyme became more susceptible to proteolysis by thermolysin. In contrast, increasing the chain length of the spacer made the enzyme less amenable to inhibition by a specific antibody. 5. These data are discussed in terms of the effect of the matrix on the conformation of the bound enzyme.
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PMID:Immobilised lipoamide dehydrogenase. 2. Properties of the enzyme immobilised to agarose through spacer molecules of various lengths. 56 Sep 66

NADH and NADPH diaphorase isozymes have been studied in human tissues. Evidence from rare heterozygotes suggests that the red cell and main tissue forms of NADH diaphorase are products of the same locus DIA1. NADPH-dependent diaphorase appears to be the product of a second locus DIA2. A third locus, DIA3, codes for the polymorphic sperm diaphorase. The products of this locus are also found in foetal tissues including placenta and adult brain and gonads. The products of these three loci may be distinguished by their substrate specificity, thermostability and molecular size.
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PMID:An interpretation of human diaphorase isozymes in terms of three gene loci DIA1, DIA2 and DIA3. 56 99

Spinal ganlia of a 9-day chick embryo were cultivated by the method of "floating rafts" in common medium (control) and in the medium containing amizyl (100 microgram/ml) or a neuregrowth factor (50 microgram/ml). With the action of amizyl there proved to be an increase in the number of surviving neurons; the majority of these neurons contained monoaminoxidase; there was a rise of NAD-diaphorase activity, and, to a lesser extent, of lactic dehydrogenase and isocitric dehydrogenase activities. The neurogrowth factor caused an increase in the number of nerve cells with acetylcholinesterase; there was an elevation of NAD-diaphorase and some rise of malic dehydrogenase activities; the activity of lactic dehydrogenase became maximal; as to succinic dehydrogenase--its activity was somewhat suppressed.
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PMID:[Effect of nerve growth factor and amizil on the viability and metabolism of cultured spinal ganglia]. 56 23

Spinach nitrate reductase complex previously inactivated by treatment with mercurials p-hydroxymercuribenzoate or p-hydroxymercuriphenyl sulphonate can be reactivated by incubation with dithioerythritol. The reactivation of NADH-diaphorase seems to be FAD-dependent, whereas that of FNH2-nitrate reductase is not. The requirement of FAD for NADH-inactivation of nitrate reductase treated with p-hydroxymercuribenzoate disappears after treatment with dithioerythritol.
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PMID:Nitrate reductase from Spinacea oleracea. FAD and the reactivation of the enzyme treated with p-Hydroxymercuribenzoate. 59 86

The polymorphism of sperm diaphorase (SD) was investigated in 141 unrelated persons from Hessen, Germany, by high voltage thin-layer agarose gel electrophoresis (Age) and thin-layer isoelectric focusing on polyacrylamide gel (Pagif). In addition to the three known common phenotypes SD 1, 2-1, and 2, two further phenotypes with the preliminary designation SD 3-1 and SD 3-2 were discovered. This polymorphism can thus be explained in terms of three alleles, SD1, SD2, and SD3 segregating at an autosomal locus. The allele frequencies calculated from the five different phenotypes SD 1, 2, 2-1, 3-1, and 3-2 are: SD1 = 0.7553, SD2 = 0.2234, and SD3 = 0.0213. As we also found SD activity in female reproductive tract tissues (ovaries, oviducts, uterus), the term 'gonadal diaphorase' (GD) appears to be applicable.
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PMID:Investigations on the polymorphism of sperm diaphorase in man. Evidence for a third common allele, SD. 60 47

The differential effects of papaverine (Pap) and rotenone (Rot) were studied on the highly respiration-dependent contracture of guinea pig taenia coli in 40 mM potassium (40-K) medium, on isolated DT diaphorase activity and on mitochondrial respiration. The inhibition of guinea pig taenia coli to the 40-K induced tension by Rot (5 x 10(-7)M) was fully reversed by the addition of a water soluble vitamin K3 (VK3) derivative or menadione sodium bisulfite (MSB). A low concentration (10(-7)--10(-6)M) of Pap which had no effect on the 40-K induced tension inhibited the VK3 restored tension from the Rot suppression, corresponding to a Pap inhibition of the isolated DT diaphorase. Inhibition of the effective concentration of Pap to the 40-K induced tension development was never reversed by addition of VK3 or MSB. In taenia coli, both MSB and VK3 established a bypass of the Rot sensitive site on the mitochondrial respiratory chain by means of the DT diaphorase system. The difference in washout-efficacy between Pap and Rot on the inhibition of 40-K induced tension was ascribed to a difference in their mitochondrial binding properties.
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PMID:The inhibitory effect of papaverine on respiration-dependent contracture of guinea pig taenia coli in high-K medium. III. The differential effect of papaverine and rotenone on DT diaphorase. 60 51

The study of some NAD(P)H dehydrogenating enzymes in one slow- and one fast-growing transplantable hepatoma has shown that the activity of the soluble enzyme D-T diaphorase is increased several-fold when compared with the activity of the control livers. The increase in enzyme activity is similar in both hepatomas, regardless of the rate of growth of the tumors. The activity of the glycerolphosphate, malic and lactic dehydrogenases are decreased in both tumors. The possible functional significance of these changes is discussed in the text.
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PMID:The activity of the D-T diaphorase in experimental hepatomas. 61 21

1. Gene frequencies of esterase D, glyoxalase I and uridine monophosphate kinase in Alaskan populations were determined. 2. Improved methods for demonstrating phenotypes of glyoxalase I and uridine monophosphate kinase are presented. 3. Rare variants of adenylate kinase (AK1) and diaphorase (DIA) were found. One of the AK1 variants is new. 4. Gene frequencies were notably diverse within major ethnic groups. This variability was consistent with a population structure composed of small groups that were relatively isolated from one another.
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PMID:Polymorphism of red cell enzymes in Alaskan ethnic groups. 62 78

After having described in detail the pathophysiology, symptomatology, X-chromosomal inheritance and some laboratory methods in detecting G-6-PD-deficiency by demonstrating a case of favism (Schulz et al. 1977), the authors now discuss the particularities of the enzyme deficiency in the newborn. These are complicated by additional physiological and transient deficiency of the enzymes catalase, NAD-diaphorase, glutathione peroxidase, and glucuronyl transferase. Several chemical substances, acidosis, hypoxia, hypoglycemia, and immaturity may cause a severe hyperbilirubinemia in G-6-PD-deficient newborns. The development of a kern-icterus in these cases may be prevented by early exchange transfusion. From clinical findings and some observations in different regions of Greece an additional factor influencing the liver function has been postulated which favors the development of hyperbilirubinemias in G-6-PD-deficient newborns. The nature of this possible factor is discussed. The authors emphasize the necessity of screening for G-6-PD-deficiency during pregnancy in families of mediterranian descent.
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PMID:[Glucose-6-phosphate dehydrogenase deficiency of the mediterranean type B minus. 2. Etiological basis for severe hyperbilirubinemia in the newborn]. 63 93

We describe a highly sensitive and accurate automated continuous-flow method for determining bile acids in serum. The bile acids are first liberated from serum protein by dialysis at alkaline pH and then measured fluorometrically after the following enzymic reaction. Bile acids are converted to 3-oxo bile acids with 3alpha-hydroxysteroid dehydrogenase (EC 1.1.1.50) with concomitant reduction of NAD+ to NADH. The hydrogen in the generated NADH is transferred by diaphorase (EC 1.6.4.3) to resazurin to yield resorfin, the fluorophore. Only 100 microliter of serum is required and 40 determinations can be done per hour. The CV for 20 replicate determinations in serum with a mean bile acid concentration of 9.8 mumol/liter was 2.6%. The CV for day-to-day variation for another serum on 27 successive days was 3.0% (mean concentration, 10.0 mumol/liter). We applied this method to 826 sera from various diseases; 29% exceeded the upper limit of normal, 10 mumol/liter, and abnormally high values (greater than 20 mumol/liter) were almost exclusively limited to sera from hepatobiliary and enteric disorders.
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PMID:Continuous-flow determination of bile acids in serum, and its clinical application. 65 94


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