Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts: Gene/Protein Disease Symptom Drug Enzyme Compound   Target Concepts: Gene/Protein Disease Symptom Drug Enzyme Compound

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Query: EC:3.1.27.4 (ribonuclease)
6,621 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Kinetic studies have been made with glutathione-insulin transhydrogenase, an enzyme which degrades insulin by promoting cleavage of its disulfide bonds via sulfhydryl-disulfide interchange. The degradation of 125I-labeled insulin by enzyme purified from beef pancreas was studied with various thiol-containing compounds as cosubstrates. The apparent Km for insulin was found to be a function of the type and concentration of thiol; values obtained were in the range from 1 to 40 muM. Lineweaver-Burk plots for insulin as varied substrate were linear, whereas those for the thiol substrates were nonlinears: the plots for low molecular weight monothiols (GSH and mercaptoethanol) were parabolic; those for low molecular weight dithiols (dithiothreitol, dihydrolipoic acid, and 2,3-dimercaptopropanol) were apparently linear modified by substrate inhibition; and the plots for protein polythiols (reduced insulin A and B chains and reduced ribonuclease) were parabolic with superposed substrate inhibition. The nonparallel nature of the reciprocal plots for all substrates shows that the enzyme does not follow a ping-pong mechanism. Product inhibition studies were performed with GSH as thiol substrate. Oxidized glutathione was found to be a linear competitive inhibitor vs. both GSH and insulin. The S-sulfonated derivative of insulin A chain was also linearly competitive vs. both substrates. Inhibition by S-sulfonated B chain was competitive vs. insulin; the data eliminated the possibility that this derivative was uncompetitive vs. GSH. Experiments with the cysteic acid derivatives of insulin A and B chains similarly excluded the possibility that these were uncompetitive vs. either substrate. These inhibition studies indicate that the enzyme probably follows a randdom mechanism.
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PMID:Kinetic analysis of the mechanism of insulin degradation by glutathione-insulin transhydrogenase (thiol: protein-disulfide oxidoreductase). 117 Aug 76

With the glutathione system that leads to rapid regeneration of reduced lysozyme (Saxena, V. P., and Wetlaufer, D. B. (1971) Biochemistry 9, 5015), reduced pancreatic ribonuclease (RNase) regenerated activity in high yield (greater than 90%) but at a considerably lower rate (t1/2 approximately 75 min). Systematic examination of the effects upon regeneration of the concentrations and ratios of reduced and oxidized glutathione (GSH and GSSG) showed the same broad optima for RNase as were earlier found for lysozyme: [GSSG] = 5 X 10(-4) M, [GSH] = 5 X 10(-3) M. Regeneration of reduced RNase by air oxidation was shown to be inhibitable by 10(-4) M EDTA, whereas the glutathione regeneration was unaffected by EDTA. In addition the air-oxidative regeneration showed a strong temperature dependence, in contrast with the glutathione system. The mechanisms of these two kinds of regenerations are therefore different. Six potentially catalytic metal ions were tested in the air-oxidative regeneration of RNase: Cu2+, Co2+, Mn2+, Fe3+, Zn2+, and Ni2+. Of these, only Cu2+ enhanced the rate of regeneration of RNase activity, although both Cu2+ and Co2+ catalyzed thioloxidation of reduced RNase. The rates and yields of RNase regenerations were independent of protein concentration from 3 X 10(-7) M to 1.2 X 10(-5) M in the glutathione system. Preincubation of freshly dissolved reduced RNase under nonoxidizing conditions before adding glutathione did not change the rate or extent of regeneration. Studies of its pH dependence showed that the glutathione regeneration depends on the deprotonation of prototropic groups with 7.5 less than pK less than 8.0. The major ion exchange chromatographic peaks from glutathione and air-oxidative regenerations appeared to be identical with native RNase, by the criteria of specific activity, chromatographic mobility, and circular dichroic spectra. The glutathione system permits regeneration at much higher RNase concentration than the air regeneration, with rates and yields comparable to the greatest reported for air regeneration.
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PMID:Nonenzymic reactivation of reduced bovine pancreatic ribonuclease by air oxidation and by glutathione oxidoreduction buffers. 119 63

Thioredoxin (Trx) from Escherichia coli was compared with bovine protein disulfide-isomerase (PDI) for its ability to catalyze native disulfide formation in either reduced or randomly oxidized (scrambled) ribonuclease A (RNase). On a molar basis, a 100-fold higher concentration of Trx than of PDI was required to give the same rate of native disulfide formation measured as recovery of RNase activity. A Pro-34 to His (P34H Trx) mutation in the active site of E. coli Trx (WCGPC), mimicking the two suggested active sites in PDI (WCGHC), increased the catalytic activity in disulfide formation about 10-fold. The mutant P34H Trx displayed a 35-mV higher redox potential (E'0) of the active site disulfide/dithiol relative to wild type Trx, making it more similar to the redox potential observed for PDI. This higher redox potential correlates well with the enhanced activity and suggests a role for the histidine side chain. Enzymatic isomerization of disulfides in scrambled, oxidized RNase requires the presence of a catalytic thiol such as GSH to initiate the thiol-disulfide interchange. Bovine thioredoxin reductase, together with NADPH, could replace GSH. For oxidative folding of reduced RNase in air with Trx, P34H Trx, or PDI, catalytic amounts of sodium selenite (1 microM) resulted in rapid disulfide formation and high yields of ribonuclease activity equivalent to previously known redox buffers of GSH and GSSG. These results demonstrate no obligatory role for glutathione in disulfide formation. A possible mechanism for the unknown thiol oxidative process accompanying folding and protein disulfide formation in vivo is discussed.
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PMID:A Pro to His mutation in active site of thioredoxin increases its disulfide-isomerase activity 10-fold. New refolding systems for reduced or randomly oxidized ribonuclease. 157 42

The velocity of the oxidative renaturation of reduced ribonuclease A catalyzed by protein disulfide isomerase (PDI) is strongly dependent on the composition of a glutathione/glutathione disulfide redox buffer. As with the uncatalyzed, glutathione-mediated oxidative folding of ribonuclease, the steady-state velocity of the PDI-catalyzed reaction displays a distinct optimum with respect to both the glutathione (GSH) and glutathione disulfide (GSSG) concentrations. Optimum activity is observed at [GSH] = 1.0 mM and [GSSG] = 0.2 mM. The apparent kcat at saturating RNase concentration is 0.46 +/- 0.05 mumol of RNase renatured min-1 (mumol of PDI)-1 compared to the apparent first-order rate constant for the uncatalyzed reaction of 0.02 +/- 0.01 min-1. Changes in GSH and GSSG concentration have a similar effect on the rate of both the PDI-catalyzed and uncatalyzed reactions except under the more oxidizing conditions employed, where the catalytic effectiveness of PDI is diminished. The ratio of the velocity of the catalyzed reaction to that of the uncatalyzed reaction increases as the quantity [GSH]2/[GSSG] increases and approaches a constant, limiting value at [GSH]2/[GSSG] greater than 1 mM, suggesting that a reduced, dithiol form of PDI is required for optimum activity. As long as the glutathione redox buffer is sufficiently reducing to maintain PDI in an active form [( GSH]2/[GSSG] greater than 1 mM), the rate acceleration provided by PDI is reasonably constant, although the actual rate may vary by more than an order of magnitude. PDI exhibits half of the maximum rate acceleration at a [GSH]2/[GSSG] of 0.06 +/- 0.01 mM.
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PMID:Catalysis of the oxidative folding of ribonuclease A by protein disulfide isomerase: dependence of the rate on the composition of the redox buffer. 198 50

At low concentrations of a glutathione redox buffer, the protein disulfide isomerase (PDI) catalyzed oxidative renaturation of reduced ribonuclease A exhibits a rapid but incomplete activation of ribonuclease, which precedes the steady-state reaction. This behavior can be attributed to a GSSG-dependent partitioning of the substrate, reduced ribonuclease, between two classes of thiol/disulfide redox forms, those that can be converted to active ribonuclease at low concentrations of GSH and those that cannot. With catalytic concentrations of PDI and near stoichiometric concentrations of glutathione disulfide, approximately 4 equiv (2 equiv of ribonuclease disulfide) of GSH are formed very rapidly followed by a slower formation of GSH, which corresponds to an additional 2 disulfide bond equiv. The rapid formation of RNase disulfide bonds and the subsequent rearrangement of incorrect disulfide isomers to active RNase are both catalyzed by PDI. In the absence of GSSG or other oxidants, disulfide bond equivalents of PDI can be used to form disulfide bonds in RNase in a stoichiometric reaction. In the absence of a glutathione redox buffer, the rate of reduced ribonuclease regeneration increases markedly with increasing PDI concentrations below the equivalence point; however, PDI in excess over stoichiometric concentrations inhibits RNase regeneration.
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PMID:Catalysis of the oxidative folding of ribonuclease A by protein disulfide isomerase: pre-steady-state kinetics and the utilization of the oxidizing equivalents of the isomerase. 198 51

GSH, but not GSSG, inhibits the reactivation by phosphate ion of ribonuclease activity inactivated by urea or guanidine. The effects of GSH are rather slow and pretreatment of ribonuclease with urea is a requisite for the inhibitory action of GSH on enzyme reactivation. GSH is more effective in urea than in guanidine and its action is greatly enhanced by EDTA. An optimum pH of about 9.0 was found for the inhibitory effect of GSH. Titration of the thiol groups formed after inactivation of ribonuclease by GSH strongly suggests that the reduction of only one disulphide linkage is involved. The reduction of this bond is sufficient to completely abolish the enzymic activity.
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PMID:Effect of glutathione on ribonuclease. 496 74

Refolding of dimeric porcine cytosolic or mitochondrial malate dehydrogenases and of tetrameric pig heart and skeletal muscle lactate dehydrogenases (containing 5-7 cysteine residues), as well as reformation of the four cystine cross-bridges of bovine pancreatic ribonuclease, were studied in the presence of reduced and oxidized glutathione (GSH and GSSG). At the intracellular GSH level (5 mM) reduced ribonuclease can be reoxidized by 0.01-0.5 mM GSSG (pH 7.4) both at 20 degrees C and 37 degrees C. In this physiological range of GSSG concentrations and pH, the dehydrogenases show at least partial reactivation. With GSSG concentrations greater than 5 mM, reactivation is found to be completely inhibited for all the enzymes given. The results show that at the intracellular level of GSH and GSSG, thiol groups in reduced, unfolded ribonuclease are oxidized to form intramolecular cystine cross-bridges, while thiol groups of typical cysteine enzymes, such as lactate and malate dehydrogenase, remain in their reduced state during refolding. The rate of reactivation of lactate dehydrogenase (porcine muscle) is not affected by GSSG. In the case of ribonuclease, increasing concentrations of GSSG increase the rate of reactivation: At 20 degrees C, the halftime of the correct disulfide bond formation varies from approximately equal to 80 h in the presence of 0.01 mM GSSG to approximately equal to 10 h in the presence of 0.25 mM GSSG. A further increase in the rate of reactivation at higher GSSG concentrations is accompanied by a decrease in yield. Reactivation of ribonuclease is also observed at the low glutathione level found in blood plasma (5-25 microM GSH).
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PMID:Influence of glutathione on the reactivation of enzymes containing cysteine or cystine. 661 43

Protein folding, associated with isomerization of disulfide bonds, was studied using the mixed disulfide between glutathione and reduced ribonuclease T1 (GS-RNase T1) as a stable soluble and homogeneous starting material; conditions were selected to model those within the lumen of the endoplasmic reticulum where native disulfide bonds are formed in protein biosynthesis. Folding was initiated by addition of free glutathione (GSH +/- GSSG) to promote thiol-disulfide interchange and was monitored by intrinsic protein fluorescence, appearance of native ribonuclease activity, HPLC, and nonreducing SDS-PAGE. All the analyses indicated that native RNase T1 was recovered in high yield in a variety of redox conditions. Appearance of native activity followed first-order kinetics; kinetic analysis of the intrinsic fluorescence changes indicated an additional rapid process in some conditions, interpreted as the formation of a nonnative intermediate state. Analysis by HPLC and SDS-PAGE also indicated the formation of transient intermediates. In 1.5 M NaCl, GS-RNase T1 adopts a compact native-like conformation; refolding by thiol-disulfide interchange in these conditions was accelerated approximately 2-fold. Refolding of GS-RNase T1 was catalyzed by protein disulfide isomerase (PDI); substoichiometric quantities of PDI accelerated refolding several-fold. GS-RNase T1 refolding was inhibited by BiP; refolding was completely blocked in presence of a 5-fold molar excess of BiP, and the yield of refolding was substantially reduced by equimolar concentrations of BiP; the refolding was then restored by the addition of ATP. GS-RNase T1 is a convenient model substrate for studying protein folding linked to native disulfide formation in conditions comparable to those within the lumen of the endoplasmic reticulum.
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PMID:Refolding by disulfide isomerization: the mixed disulfide between ribonuclease T1 and glutathione as a model refolding substrate. 762 8

Glutaredoxin (Grx) contains a redox-active disulfide and catalyzes thiol-disulfide interchange reactions with specificity for GSH. The dithiol form of Grx reduces mixed disulfides involving GSH or protein disulfides. During oxidative refolding of 8 microM reduced and denatured ribonuclease RNase-(SH)8 in a redox buffer of 1 mM GSH and 0.2 mM GSSG to yield native RNase-(S2)4, a large number of GSH-mixed disulfide species are formed. A lag phase that precedes formation of folded active RNase at a steady-state rate was shortened or eliminated by the presence of a catalytic concentration (0.5 microM) of Escherichia coli Grx together with protein disulfide-isomerase (PDI), its procaryotic equivalent E. coli DsbA, or the PDI analogue the E. coli thioredoxin mutant protein P34H. A mutant Grx in which one of the active site cysteine residues (Cys-11 and Cys-14) had been replaced by serine, C14S Grx, had similar effect compared with its wild-type counterpart. This demonstrated that Grx acted by a monothiol mechanism involving only Cys-11 and that RNase-S-SG-mixed disulfides were the substrates. Grx displayed synergistic activity together with PDI only in GSH/GSSG redox buffers with sufficiently low redox potential (E'0 of -208 or -181 mV) to allow reduction of the active site of Grx. In refolding systems that do not depend on glutathione, like cystamine/cysteamine or in the presence of selenite (SeO3(2-)), no synergistic activity of Grx was observed with PDI. We conclude that Grx acts by reducing mixed disulfides between GSH and RNase that are rate-limiting in enzyme-catalyzed refolding.
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PMID:Glutaredoxin accelerates glutathione-dependent folding of reduced ribonuclease A together with protein disulfide-isomerase. 771 72

It has been shown previously that CaBP2, the rat analog of the murine protein ERp72, and CaBP1, the rat analogue of the hamster protein P5, represent members of the protein disulfide isomerase (PDI) family and are able to catalyze the reduction of insulin in the presence of various reductants (Nguyen Van et al., 1993). We have now examined the abilities of CaBP2 and CaBP1 to catalyze the renaturation of denatured reduced model proteins. Both CaBP2 and CaBP1 catalyzed the reappearance of the biological activity of the denatured reduced Fab fragment of a monoclonal anti-human creatine phosphokinase antibody. The reaction rate was positively correlated with the amount of CaBP2 or CaBP1 and dependent on the GSH/GSSG ratio (maximum at GSH/GSSG = 1). Peptide prolyl-cis,trans-isomerase (PPI), which catalyzed some renaturation on its own, showed synergistic effects with PDI, CaBP2, and CaBP1. No synergistic effects could be observed when the combinations CaBP2 + PDI, CaBP1 + PDI, or CaBP2 + CaBP1 were tested. Variation of [Ca2+] between 0 and 1 mM did not have any effect on the rate or amount of renaturation catalyzed by CaBP2, CaBP1, or PDI, nor were these parameters affected by the simultaneous presence of BiP or grp94. Both CaBP2 and CaBP1 catalyzed also the renaturation of denatured reduced ribonuclease AIII in a way that depended on the amounts of CaBP2 or CaBP1 and on the redox potential of the redox system used (GSH/GSSG or CSH/CSSC). PPI alone had no effect on the rate of RNase AIII renaturation and did not significantly affect renaturation catalyzed by PDI, CaBP2, or CaBP1. PDI showed a moderate but significant synergism with CaBP2, and a strong synergism with CaBP1. The results indicate that both CaBP2 and CaBP1 can catalyze the formation of disulfide bonds and protein disulfide isomerization and may thus be involved in the folding of nascent proteins in the secretory pathway. This does not exclude the possibility of additional functions of these proteins in the pre-Golgi compartments.
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PMID:Effects of CaBP2, the rat analog of ERp72, and of CaBP1 on the refolding of denatured reduced proteins. Comparison with protein disulfide isomerase. 830 May 76


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