Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UNIPROT:P06889 (Mol)
 630,302 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

1. The ventilatory responses to transient and steady-state hypoxia were measured in ten patients with hepatic cirrhosis and in ten healthy control subjects. Successive measurements of these responses were also obtained in six goats before and after the experimental production of liver failure. Changes in the effect of steady-state hypoxia on the ventilatory response to hypercapnia were evaluated by successive studies in another goat. 2. In spite of a respiratory alkalosis during liver failure, the response to transient hypoxia was greater in the patients than in the control subjects. This response was increased after the onset of liver failure in all the goats. 3. In healthy humans and goats the responses to transient and steady-state hypoxia were similar in magnitude. During liver failure there was a disparity between the size of these responses, since the ventilatory increment evoked by steady-state hypoxia was unchanged in spite of the increase in response to transient hypoxia. Steady-state hypoxia consistently enhanced the ventilatory response to hypercapnia in a healthy goat, but frequently depressed the response to hypercapnia during liver failure. 4. The findings suggest that liver failure heightens the sensitivity of the peripheral chemoreceptors to the hypoxic stimulus, but may increase the tendency of the medullary centres to become depressed in hypoxia.
Clin Sci Mol Med 1976 Jan
PMID:Effect of liver failure on the ventilatory response to hypoxia in man and the goat. 0 6

1. Ventilatory response to carbon dioxide was measured by the rebreathing technique in seven patients with mild tetanus during the disease state and after clinical recovery. 2. The ventilatory response to carbon dioxide was found to be decreased in the tetanus patients during the disease state with normal response after full clinical recovery. It is postulated that the restrictive ventilatory defect was responsible for the decreased ventilatory response to carbon dioxide.
Clin Sci Mol Med 1976 Jan
PMID:Ventilatory response to carbon dioxide in tetanus. 0 7


J Mol Biol 1975 Dec 15
PMID:The determination of stability constants from small-angle x-ray scattering data and the analysis of pH-dependent macromolecular equilibria. 0 84


J Mol Biol 1975 Dec 25
PMID:Subunit composition, x-ray diffraction, amino acid analysis and oxygen binding behaviour of Panulirus interruptus hemocyanin. 0 85

Aminomalononitrile (HCN trimer) reacts with electrophiles such as aldehydes and acrylonitrile under very mild conditions of temperature and pH to produce intermediates which, after acid hydrolysis, yield amino acids. The following amino acids have been identified and quantitated: glycine, D, L-erythro- and D, L-threo-beta - hydroxyaspartic acids, D, L glutamic acid, and D, L-threonine and allo-threonine. The mechanism of their formation and the possible significance of these reactions in prebiotic syntheses are discussed.
J Mol Evol 1975 Dec 31
PMID:Reactions of aminomalononitrile with electrophiles. 0 86

All Bacillus subtilis R-type strains showing the phenomena of restriction and modification contain an endonuclease that inactivates in vitro the biological activity of a variety of DNAs lacking R-specific modification, such as transfecting SPPI, SPO2 and phi105 DNA, and transforming B. subtilis 168-type DNA. The corresponding DNAs carrying R-specific modification are resistant to the enzyme. The enzyme has been purified approximately 400-fold and is essentially free from contaminating double strand-directed unspecific exo- or endonuclease activity. Only Mg2+ is required as cofactor. The substrate DNAs are cleaved at specific sites. The double-stranded fragments produced from SPP1 DNA (molecular weight 2.5 x 10(7)) have an average molecular weight of about 3 x 10(5).
Mol Gen Genet 1975 Dec 30
PMID:Restriction and modification in B. subtilis. Purification and general properties of a restriction endonuclease from strain R. 0 56

Enzyme preparations from oat seedlings showing the activity of myo-inositol oxygenase (E.C.1.13.99.1) have been described previously. In contrast to myo-inositol oxygenase preparations from other sources, e.g. rat kidney or yeast, the oat enzyme seemed to exhibit a somewhat less stringent activity, acting on other inositols and inositol methyl ethers as well as on myo-inositol. By purification of the enzyme present in the extract from oat seedlings with the help of an affinity gel specific for enzymes acting on myo-inositol a homogeneous enzyme preparation was obtained, which shows the same strict specificity as the myo-inositol oxygenase from other sources. It has a molecular weight of 62,000 and tends to aggregate to oligomers (up to tetramers) under physiological pH-values; in more alkaline media dissociation to monomers is observed. The action on the other inositols and inositol methyl ethers is apparently due to one or more other enzymes, which are also adsorbed on the affinity gel, but can be separated from the myo-inositol oxygenase by elution with increasing concentrations of myo-inositol.
Mol Cell Biochem 1976 Jan 31
PMID:Myo-inositol oxygenase from oat seedlings. 0 57

The factors involved in the movement of monovalent cations across the inner membrane of the isolate heart mitochondrion are reviewed. The evidence suggests that the energy-dependent uptake of K+ and Na+ which results in swelling of the matrix is an electrophoretic response to a negative internal potential. There are no clear cut indications that this electrophoretic cation movement is carrier-mediated and possible modes of entry which do not require a carrier are examined. The evidence also suggests that the monovalent cation for proton exchanger (Na+ greater than K+) present in the membrane may participate in the energy-dependent extrusion of accumulated ions. The two processes, electrophoreti c cation uptake (swelling) and exchange-dependent cation extrusion (contraction) may represent a means of controlling the volume of the mitochondrion within the functioning cell. A number of indications point to the possibility that the volume control process may be mediated by the divalent cations Ca+2 and Mg+2. Studies with mercurial reagents also implicate certain membrane thiol groups in the postulated volume control process.
Mol Cell Biochem 1976 Jan 31
PMID:The uptake and extrusion of monovalent cations by isolated heart mitochondria. 0 58

Influence of pH was studied on the absorption spectra (340-670 nm) and on the curves of abnormal dispersion of optic rotation (220-270 nm) of the lupine ferri-leg-hemoglobin (Lb). pH range of the existence of the lupine Lb native form was determined (pH 5.5-11.0 at 20-25degrees C). It has been shown that not only met-hydroxy transition (which is in a complicated manner connected with the ionization of both ligand-bound water and certain amino acid residues of globin) but the ionization of a group with pK approximately 5, too, in the native molecule produces a heterotropic effect onto the haem. Complex analysis of the acidic and alkaline denaturation evidences that these processes are cooperative and proceed via several stages. pK values and the number of tyrosine residues were determined; it has been shown that these amino acid moieties are "buried" in the protein molecule. The results are discussed on the basis of a tentative model of the lupine Lb spatial suggested by the authors.
Mol Biol (Mosk)
PMID:[Acid-alkaline equilibrium of the ferri-leg-hemoglobin of the lupine (Lupinus luteus L.) Spectral studies]. 0 59

Kinetics of DNA alkylation with 2',3'-o-[N-2-chloroethyl-N-methylamino)benzylidene]uridine (UCHRCL), uridine-5'-methylphosphate (MepUCHRCL) and 4-(N-2-chloroethyl-N-methylamino)benzylamine (NH2CH2RCl) and kinetics of elimination of alkylated bases have been studied. Efficiency of DNA alkylation (p/s-ratio of rate constant of alkylation to the sum of rate constants of by-reactions of an active intermediate formed from the reagent) increases with an increase of the positive charge of the reagents as well as efficiency of tRNA alkylation. Alkylated bases are eliminated from DNA; rate of elimination depends on the structure of the reagent; it decreases in the series NH2CH2R- greater than greater than UCHR-greater than MepUCHR-. Bases alkylated by NH2CH2RCl and UCHRCl are eliminated from DNA during alkylation; therefore plots of DNA alkylation by NH2CH2RCl have a maximum. DNA alkylated by MepUCHRCl is rather stable; alkylated bases are not eliminated during alkylation. Effect of temperature and pH on elimination has been studied.
Mol Biol (Mosk)
PMID:[Kinetic characteristics of DNA alkylation with some chloroethylmethylarylamines and elimination of alkylated bases from DNA]. 0 60


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