European journal of biochemistry最新文献

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Phylogenetic relationships in class I of the superfamily of bacterial, fungal, and plant peroxidases. 细菌、真菌和植物过氧化物酶超家族I类的系统发育关系。
European journal of biochemistry Pub Date : 2004-08-01 DOI: 10.1111/j.1432-1033.2004.04262.x
Marcel Zámocký
{"title":"Phylogenetic relationships in class I of the superfamily of bacterial, fungal, and plant peroxidases.","authors":"Marcel Zámocký","doi":"10.1111/j.1432-1033.2004.04262.x","DOIUrl":"https://doi.org/10.1111/j.1432-1033.2004.04262.x","url":null,"abstract":"Molecular phylogeny among catalase-peroxidases, cytochrome c peroxidases, and ascorbate peroxidases was analysed. Sixty representative sequences covering all known subgroups of class I of the superfamily of bacterial, fungal, and plant heme peroxidases were selected. Each sequence analysed contained the typical peroxidase motifs evolved to bind effectively the prosthetic heme group, enabling peroxidatic activity. The N-terminal and C-terminal domains of catalase-peroxidases matching the ancestral tandem gene duplication event were treated separately in the phylogenetic analysis to reveal their specific evolutionary history. The inferred unrooted phylogenetic tree obtained by three different methods revealed the existence of four clearly separated clades (C-terminal and N-terminal domains of catalase-peroxidases, ascorbate peroxidases, and cytochrome c peroxidases) which were segregated early in the evolution of this superfamily. From the results, it is obvious that the duplication event in the gene for catalase-peroxidase occurred in the later phase of evolution, in which the individual specificities of the peroxidase families distinguished were already formed. Evidence is presented that class I of the heme peroxidase superfamily is spread among prokaryotes and eukaryotes, obeying the birth-and-death process of multigene family evolution.","PeriodicalId":11817,"journal":{"name":"European journal of biochemistry","volume":"271 16","pages":"3297-309"},"PeriodicalIF":0.0,"publicationDate":"2004-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/j.1432-1033.2004.04262.x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40888927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 49
Relationships between structure, function and stability for pyridoxal 5'-phosphate-dependent starch phosphorylase from Corynebacterium callunae as revealed by reversible cofactor dissociation studies. 可逆性辅因子解离研究揭示了愈伤棒状杆菌吡哆醛5'-磷酸依赖性淀粉磷酸化酶的结构、功能和稳定性之间的关系。
European journal of biochemistry Pub Date : 2004-08-01 DOI: 10.1111/j.1432-1033.2004.04265.x
Richard Griessler, Barbara Psik, Alexandra Schwarz, Bernd Nidetzky
{"title":"Relationships between structure, function and stability for pyridoxal 5'-phosphate-dependent starch phosphorylase from Corynebacterium callunae as revealed by reversible cofactor dissociation studies.","authors":"Richard Griessler,&nbsp;Barbara Psik,&nbsp;Alexandra Schwarz,&nbsp;Bernd Nidetzky","doi":"10.1111/j.1432-1033.2004.04265.x","DOIUrl":"https://doi.org/10.1111/j.1432-1033.2004.04265.x","url":null,"abstract":"<p><p>Using 0.4 m imidazole citrate buffer (pH 7.5) containing 0.1 mm l-cysteine, homodimeric starch phosphorylase from Corynebacterium calluane (CcStP) was dissociated into native-like folded subunits concomitant with release of pyridoxal 5'-phosphate and loss of activity. The inactivation rate of CcStP under resolution conditions at 30 degrees C was, respectively, four- and threefold reduced in two mutants, Arg234-->Ala and Arg242-->Ala, previously shown to cause thermostabilization of CcStP [Griessler, R., Schwarz, A., Mucha, J. & Nidetzky, B. (2003) Eur. J. Biochem.270, 2126-2136]. The proportion of original enzyme activity restored upon the reconstitution of wild-type and mutant apo-phosphorylases with pyridoxal 5'-phosphate was increased up to 4.5-fold by added phosphate. The effect on recovery of activity displayed a saturatable dependence on the phosphate concentration and results from interactions with the oxyanion that are specific to the quarternary state. Arg234-->Ala and Arg242-->Ala mutants showed, respectively, eight- and > 20-fold decreased apparent affinities for phosphate (K(app)), compared to the wild-type (K(app) approximately 6 mm). When reconstituted next to each other in solution, apo-protomers of CcStP and Escherichia coli maltodextrin phosphorylase did not detectably associate to hybrid dimers, indicating that structural complementarity among the different subunits was lacking. Pyridoxal-reconstituted CcStP was inactive but approximately 60% and 5% of wild-type activity could be rescued at pH 7.5 by phosphate (3 mm) and phosphite (5 mm), respectively. pH effects on catalytic rates were different for the native enzyme and pyridoxal-phosphorylase bound to phosphate and could reflect the differences in pK(a) values for the cofactor 5'-phosphate and the exogenous oxyanion.</p>","PeriodicalId":11817,"journal":{"name":"European journal of biochemistry","volume":"271 16","pages":"3319-29"},"PeriodicalIF":0.0,"publicationDate":"2004-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/j.1432-1033.2004.04265.x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40888138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
Akt-dependent phosphorylation negatively regulates the transcriptional activity of dHAND by inhibiting the DNA binding activity. akt依赖性磷酸化通过抑制DNA结合活性负向调节dHAND的转录活性。
European journal of biochemistry Pub Date : 2004-08-01 DOI: 10.1111/j.1432-1033.2004.04267.x
Masao Murakami, Keiichiro Kataoka, Shigetomo Fukuhara, Osamu Nakagawa, Hiroki Kurihara
{"title":"Akt-dependent phosphorylation negatively regulates the transcriptional activity of dHAND by inhibiting the DNA binding activity.","authors":"Masao Murakami,&nbsp;Keiichiro Kataoka,&nbsp;Shigetomo Fukuhara,&nbsp;Osamu Nakagawa,&nbsp;Hiroki Kurihara","doi":"10.1111/j.1432-1033.2004.04267.x","DOIUrl":"https://doi.org/10.1111/j.1432-1033.2004.04267.x","url":null,"abstract":"<p><p>HAND2/dHAND is a basic helix-loop-helix transcription factor expressed in the heart and neural crest derivatives during embryogenesis. Although dHAND is essential for branchial arch, cardiovascular and limb development, its target genes have not been identified. The regulatory mechanisms of dHAND function also remain relatively unknown. Here we report that Akt/PKB, a serine/threonine protein kinase involved in cell survival, growth and differentiation, phosphorylates dHAND and inhibits dHAND-mediated transcription. AU5-dHAND expressed in 293T cells became phosphorylated, possibly at its Akt phosphorylation motif, in the absence of kinase inhibitors, whereas the phosphatidylinositol 3-kinase inhibitor wortmannin and the Akt inhibitor NL-71-101, but not the p70 S6 kinase inhibitor rapamycin, significantly reduced dHAND phosphorylation. Coexpression of HA-Akt augmented dHAND phosphorylation at multiple serine and threonine residues mainly located in the bHLH domain and, as a result, decreased the transcriptional activity of dHAND. Consistently, alanine mutation mimicking the nonphosphorylation state abolished the inhibitory effect of Akt on dHAND, whereas aspartate mutation mimicking the phosphorylation state resulted in a loss of dHAND transcriptional activity. These changes in dHAND transcriptional activity were in parallel with changes in the DNA binding activity rather than in dimerization activity. These results suggest that Akt-mediated signaling may regulate dHAND transcriptional activity through the modulation of its DNA binding activity during embryogenesis.</p>","PeriodicalId":11817,"journal":{"name":"European journal of biochemistry","volume":"271 16","pages":"3330-9"},"PeriodicalIF":0.0,"publicationDate":"2004-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/j.1432-1033.2004.04267.x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40888139","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 18
Substrate specificity and transport mode of the proton-dependent amino acid transporter mPAT2. 质子依赖性氨基酸转运体mPAT2的底物特异性和转运方式。
European journal of biochemistry Pub Date : 2004-08-01 DOI: 10.1111/j.1432-1033.2004.04268.x
Martin Foltz, Carmen Oechsler, Michael Boll, Gabor Kottra, Hannelore Daniel
{"title":"Substrate specificity and transport mode of the proton-dependent amino acid transporter mPAT2.","authors":"Martin Foltz,&nbsp;Carmen Oechsler,&nbsp;Michael Boll,&nbsp;Gabor Kottra,&nbsp;Hannelore Daniel","doi":"10.1111/j.1432-1033.2004.04268.x","DOIUrl":"https://doi.org/10.1111/j.1432-1033.2004.04268.x","url":null,"abstract":"<p><p>The PAT2 transporter has been shown to act as an electrogenic proton/amino acid symporter. The PAT2 cDNA has been cloned from various human, mouse and rat tissues and belongs to a group of four genes (pat1 to pat4) with PAT3 and PAT4 still resembling orphan transporters. The first immunolocalization studies demonstrated that the PAT2 protein is found in the murine central nervous system in neuronal cells with a proposed role in the intra and/or intercellular amino acid transport. Here we provide a detailed analysis of the transport mode and substrate specificity of the murine PAT2 transporter after expression in Xenopus laevis oocytes, by electrophysiological techniques and flux studies. The structural requirements to the PAT2 substrates - when considering both low and high affinity type substrates - are similar to those reported for the PAT1 protein with the essential features of a free carboxy group and a small side chain. For high affinity binding, however, PAT2 requires the amino group to be located in an alpha-position, tolerates only one methyl function attached to the amino group and is highly selective for the L-enantiomers. Electrophysiological analysis revealed pronounced effects of membrane potential on proton binding affinity, but substrate affinities and maximal transport currents only modestly respond to changes in membrane voltage. Whereas substrate affinity is dependent on extracellular pH, proton binding affinity to PAT2 is substrate-independent, favouring a sequential binding of proton followed by substrate. Maximal transport currents are substrate-dependent which suggests that the translocation of the loaded carrier to the internal side is the rate-limiting step.</p>","PeriodicalId":11817,"journal":{"name":"European journal of biochemistry","volume":"271 16","pages":"3340-7"},"PeriodicalIF":0.0,"publicationDate":"2004-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/j.1432-1033.2004.04268.x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40888140","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 34
Platelet factor 4 disrupts the intracellular signalling cascade induced by vascular endothelial growth factor by both KDR dependent and independent mechanisms. 血小板因子4通过KDR依赖和独立机制破坏血管内皮生长因子诱导的细胞内信号级联。
European journal of biochemistry Pub Date : 2004-08-01 DOI: 10.1111/j.1432-1033.2004.04263.x
Eric Sulpice, Jean-Olivier Contreres, Julie Lacour, Marijke Bryckaert, Gerard Tobelem
{"title":"Platelet factor 4 disrupts the intracellular signalling cascade induced by vascular endothelial growth factor by both KDR dependent and independent mechanisms.","authors":"Eric Sulpice,&nbsp;Jean-Olivier Contreres,&nbsp;Julie Lacour,&nbsp;Marijke Bryckaert,&nbsp;Gerard Tobelem","doi":"10.1111/j.1432-1033.2004.04263.x","DOIUrl":"https://doi.org/10.1111/j.1432-1033.2004.04263.x","url":null,"abstract":"<p><p>The mechanism by which the CXC chemokine platelet factor 4 (PF-4) inhibits endothelial cell proliferation is unclear. The heparin-binding domains of PF-4 have been reported to prevent vascular endothelial growth factor 165 (VEGF(165)) and fibroblast growth factor 2 (FGF2) from interacting with their receptors. However, other studies have suggested that PF-4 acts via heparin-binding independent interactions. Here, we compared the effects of PF-4 on the signalling events involved in the proliferation induced by VEGF(165), which binds heparin, and by VEGF(121), which does not. Activation of the VEGF receptor, KDR, and phospholipase Cgamma (PLCgamma) was unaffected in conditions in which PF-4 inhibited VEGF(121)-induced DNA synthesis. In contrast, VEGF(165)-induced phosphorylation of KDR and PLCgamma was partially inhibited by PF-4. These observations are consistent with PF-4 affecting the binding of VEGF(165), but not that of VEGF(121), to KDR. PF-4 also strongly inhibited the VEGF(165)- and VEGF(121)-induced mitogen-activated protein (MAP) kinase signalling pathways comprising Raf1, MEK1/2 and ERK1/2: for VEGF(165) it interacts directly or upstream from Raf1; for VEGF(121), it acts downstream from PLCgamma. Finally, the mechanism by which PF-4 may inhibit the endothelial cell proliferation induced by both VEGF(121) and VEGF(165), involving disruption of the MAP kinase signalling pathway downstream from KDR did not seem to involve CXCR3B activation.</p>","PeriodicalId":11817,"journal":{"name":"European journal of biochemistry","volume":"271 16","pages":"3310-8"},"PeriodicalIF":0.0,"publicationDate":"2004-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/j.1432-1033.2004.04263.x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40888137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 31
A new framework for the estimation of control parameters in metabolic pathways using lin-log kinetics. 利用林对数动力学估计代谢途径控制参数的新框架。
European journal of biochemistry Pub Date : 2004-08-01 DOI: 10.1111/j.0014-2956.2004.04269.x
Liang Wu, Weiming Wang, Wouter A van Winden, Walter M van Gulik, Joseph J Heijnen
{"title":"A new framework for the estimation of control parameters in metabolic pathways using lin-log kinetics.","authors":"Liang Wu,&nbsp;Weiming Wang,&nbsp;Wouter A van Winden,&nbsp;Walter M van Gulik,&nbsp;Joseph J Heijnen","doi":"10.1111/j.0014-2956.2004.04269.x","DOIUrl":"https://doi.org/10.1111/j.0014-2956.2004.04269.x","url":null,"abstract":"<p><p>The control properties of biochemical pathways can be described by control coefficients and elasticities, as defined in the framework of metabolic control analysis. The determination of these parameters using the traditional metabolic control analysis relationships is, however, limited by experimental difficulties (e.g. realizing and measuring small changes in biological systems) and lack of appropriate mathematical procedures (e.g. when the more practical large changes are made). In this paper, the recently developed lin-log approach is proposed to avoid the above-mentioned problems and is applied to estimate control parameters from measurements obtained in steady state experiments. The lin-log approach employs approximative linear-logarithmic kinetics parameterized by elasticities and provides analytical solutions for fluxes and metabolite concentrations when large changes are made. Published flux and metabolite concentration data are used, obtained from a reconstructed section of glycolysis converting 3-phosphoglycerate to pyruvate [Giersch, C. (1995) Eur. J. Biochem. 227, 194-201]. With the lin-log approach, all data from different experiments can be combined to give realistic elasticity and flux control coefficient estimates by linear regression. Despite the large changes, a good agreement of fluxes and metabolite concentrations is obtained between the measured and calculated values according to the lin-log model. Furthermore, it is shown that the lin-log approach allows a rigorous statistical evaluation to identify the optimal reference state and the optimal model structure assumption. In conclusion, the lin-log approach addresses practical problems encountered in the traditional metabolic control analysis-based methods by introducing suitable nonlinear kinetics, thus providing a novel framework with improved procedures for the estimation of elasticities and control parameters from large perturbation experiments.</p>","PeriodicalId":11817,"journal":{"name":"European journal of biochemistry","volume":"271 16","pages":"3348-59"},"PeriodicalIF":0.0,"publicationDate":"2004-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/j.0014-2956.2004.04269.x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40888141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 81
Possible involvement of an FKBP family member protein from a psychrotrophic bacterium Shewanella sp. SIB1 in cold-adaptation. 来自嗜冷细菌希瓦氏杆菌SIB1的FKBP家族成员蛋白可能参与冷适应。
European journal of biochemistry Pub Date : 2004-04-01 DOI: 10.1111/j.1432-1033.2004.04049.x
Yutaka Suzuki, Mitsuru Haruki, Kazufumi Takano, Masaaki Morikawa, Shigenori Kanaya
{"title":"Possible involvement of an FKBP family member protein from a psychrotrophic bacterium Shewanella sp. SIB1 in cold-adaptation.","authors":"Yutaka Suzuki,&nbsp;Mitsuru Haruki,&nbsp;Kazufumi Takano,&nbsp;Masaaki Morikawa,&nbsp;Shigenori Kanaya","doi":"10.1111/j.1432-1033.2004.04049.x","DOIUrl":"https://doi.org/10.1111/j.1432-1033.2004.04049.x","url":null,"abstract":"<p><p>A psychrotrophic bacterium Shewanella sp. strain SIB1 was grown at 4 and 20 degrees C, and total soluble proteins extracted from the cells were analyzed by two-dimensional polyacrylamide gel electrophoresis. Comparison of these patterns showed that the cellular content of a protein with a molecular mass of 28 kDa and an isoelectric point of four greatly increased at 4 degrees C compared to that at 20 degrees C. Determination of the N-terminal amino acid sequence, followed by the cloning and sequencing of the gene encoding this protein, revealed that this protein is a member of the FKBP family of proteins with an amino acid sequence identity of 56% to Escherichia coli FKBP22. This protein was overproduced in E. coli in a His-tagged form, purified, and analyzed for peptidyl-prolyl cis-trans isomerase activity. When this activity was determined by the protease coupling assay using N-succinyl-Ala-Leu-Pro-Phe-p-nitroanilide as a substrate at various temperatures, the protein exhibited the highest activity at 10 degrees C with a k(cat)/K(m) value of 0.87 micro m(-1) x s(-1). When the peptidyl-prolyl cis-trans isomerase activity was determined by the RNase T(1) refolding assay at 10 and 20 degrees C, the protein exhibited higher activity at 10 degrees C with a k(cat)/K(m) value of 0.50 micro m(-1) x s(-1). These k(cat)/K(m) values are lower but comparable to those of E. coli FKBP22. We propose that a FKBP family protein is involved in cold-adaptation of psychrotrophic bacteria.</p>","PeriodicalId":11817,"journal":{"name":"European journal of biochemistry","volume":"271 7","pages":"1372-81"},"PeriodicalIF":0.0,"publicationDate":"2004-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/j.1432-1033.2004.04049.x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40849986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 66
Disruption of the interaction between the Rieske iron-sulfur protein and cytochrome b in the yeast bc1 complex owing to a human disease-associated mutation within cytochrome b. 酵母bc1复合体中Rieske铁硫蛋白与细胞色素b的相互作用因细胞色素b的人类疾病相关突变而中断
European journal of biochemistry Pub Date : 2004-04-01 DOI: 10.1111/j.1432-1033.2004.04036.x
Nicholas Fisher, Ingrid Bourges, Philip Hill, Gael Brasseur, Brigitte Meunier
{"title":"Disruption of the interaction between the Rieske iron-sulfur protein and cytochrome b in the yeast bc1 complex owing to a human disease-associated mutation within cytochrome b.","authors":"Nicholas Fisher,&nbsp;Ingrid Bourges,&nbsp;Philip Hill,&nbsp;Gael Brasseur,&nbsp;Brigitte Meunier","doi":"10.1111/j.1432-1033.2004.04036.x","DOIUrl":"https://doi.org/10.1111/j.1432-1033.2004.04036.x","url":null,"abstract":"<p><p>The mitochondrial cytochrome b missense mutation, G167E, has been reported in a patient with cardiomyopathy. The residue G167 is located in an extramembranous helix close to the hinge region of the iron-sulfur protein. In order to characterize the effects of the mutation on the structure and function of the bc(1) complex, we introduced G167E into the highly similar yeast cytochrome b. The mutation had a severe effect on the respiratory function, with the activity of the bc(1) complex decreased to a few per cent of the wild type. Analysis of the enzyme activity indicated that the mutation affected its stability, which could be the result of an altered binding of the iron-sulfur protein on the complex. G167E had no major effect on the interaction between the iron-sulfur protein headgroup and the quinol oxidation site, as judged by the electron paramagnetic resonance signal, and only a minor effect on the rate of cytochrome b reduction, but it severely reduced the rate of cytochrome c(1) reduction. This suggested that the mutation G167E could hinder the movement of the iron-sulfur protein, probably by distorting the structure of the hinge region. The function of bc(1) was partially restored by mutations (W164L and W166L) located close to the primary change, which reduced the steric hindrance caused by G167E. Taken together, these observations suggest that the protein-protein interaction between the n-sulfur protein hinge region and the cytochrome b extramembranous cd2 helix is important for maintaining the structure of the hinge region and, by consequence, the movement of the headgroup and the integrity of the enzyme.</p>","PeriodicalId":11817,"journal":{"name":"European journal of biochemistry","volume":"271 7","pages":"1292-8"},"PeriodicalIF":0.0,"publicationDate":"2004-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/j.1432-1033.2004.04036.x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40927620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 40
Inhibition of Drosophila melanogaster acetylcholinesterase by high concentrations of substrate. 高浓度底物对黑腹果蝇乙酰胆碱酯酶的抑制作用。
European journal of biochemistry Pub Date : 2004-04-01 DOI: 10.1111/j.1432-1033.2004.04048.x
Jure Stojan, Laure Brochier, Carole Alies, Jacques Philippe Colletier, Didier Fournier
{"title":"Inhibition of Drosophila melanogaster acetylcholinesterase by high concentrations of substrate.","authors":"Jure Stojan,&nbsp;Laure Brochier,&nbsp;Carole Alies,&nbsp;Jacques Philippe Colletier,&nbsp;Didier Fournier","doi":"10.1111/j.1432-1033.2004.04048.x","DOIUrl":"https://doi.org/10.1111/j.1432-1033.2004.04048.x","url":null,"abstract":"<p><p>Acetylcholine hydrolysis by acetylcholinesterase is inhibited at high substrate concentrations. To determine the residues involved in this phenomenon, we have mutated most of the residues lining the active-site gorge but mutating these did not completely eliminate hydrolysis. Thus, we analyzed the effect of a nonhydrolysable substrate analogue on substrate hydrolysis and on reactivation of an analogue of the acetylenzyme. Analyses of various models led us to propose the following sequence of events: the substrate initially binds at the rim of the active-site gorge and then slides down to the bottom of the gorge where it is hydrolyzed. Another substrate molecule can bind to the peripheral site: (a) when the choline is still inside the gorge - it will thereby hinder its exit; (b) after choline has dissociated but before deacetylation occurs - binding at the peripheral site increases deacetylation rate but (c) if a substrate molecule bound to the peripheral site slides down to the bottom of the active-site before the catalytic serine is deacetylated, its new position will prevent the approach of water, thus blocking deacetylation.</p>","PeriodicalId":11817,"journal":{"name":"European journal of biochemistry","volume":"271 7","pages":"1364-71"},"PeriodicalIF":0.0,"publicationDate":"2004-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/j.1432-1033.2004.04048.x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40849985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 42
Protein engineering of pyruvate carboxylase: investigation on the function of acetyl-CoA and the quaternary structure. 丙酮酸羧化酶的蛋白质工程:乙酰辅酶a的功能及其四级结构的研究。
European journal of biochemistry Pub Date : 2004-04-01 DOI: 10.1111/j.1432-1033.2004.04051.x
Shinji Sueda, Md Nurul Islam, Hiroki Kondo
{"title":"Protein engineering of pyruvate carboxylase: investigation on the function of acetyl-CoA and the quaternary structure.","authors":"Shinji Sueda,&nbsp;Md Nurul Islam,&nbsp;Hiroki Kondo","doi":"10.1111/j.1432-1033.2004.04051.x","DOIUrl":"https://doi.org/10.1111/j.1432-1033.2004.04051.x","url":null,"abstract":"<p><p>Pyruvate carboxylase (PC) from Bacillus thermodenitrificans was engineered in such a way that the polypeptide chain was divided into two, between the biotin carboxylase (BC) and carboxyl transferase (CT) domains. The two proteins thus formed, PC-(BC) and PC-(CT+BCCP), retained their catalytic activity as assayed by biotin-dependent ATPase and oxamate-dependent oxalacetate decarboxylation, for the former and the latter, respectively. Neither activity was dependent on acetyl-CoA, in sharp contrast to the complete reaction of intact PC. When assessed by gel filtration chromatography, PC-(BC) was found to exist either in dimers or monomers, depending on the protein concentration, while PC-(CT + BCCP) occurred in dimers for the most part. The two proteins do not associate spontaneously or in the presence of acetyl-CoA. Based on these observations, this paper discusses how the tetrameric structure of PC is built up and how acetyl-CoA modulates the protein structure.</p>","PeriodicalId":11817,"journal":{"name":"European journal of biochemistry","volume":"271 7","pages":"1391-400"},"PeriodicalIF":0.0,"publicationDate":"2004-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/j.1432-1033.2004.04051.x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40849988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 25
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