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Ariaans G, Tiersma JF, Evers B, Gerding A, Waaijer SJH, Koster RA, Touw DJ, Bakker BM, Reijngoud DJ, de Jong S, Jalving M. Everolimus decreases [U- 13C]glucose utilization by pyruvate carboxylase in breast cancer cells in vitro and in vivo. Biomed Pharmacother 2024; 173:116362. [PMID: 38432130 DOI: 10.1016/j.biopha.2024.116362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Revised: 02/25/2024] [Accepted: 02/26/2024] [Indexed: 03/05/2024] Open
Abstract
Reprogrammed metabolism is a hallmark of cancer, but notoriously difficult to target due to metabolic plasticity, especially in response to single metabolic interventions. Combining mTOR inhibitor everolimus and mitochondrial complex 1 inhibitor metformin results in metabolic synergy in in vitro models of triple-negative breast cancer. Here, we investigated whether the effect of this drug combination on tumor size is reflected in changes in tumor metabolism using [U-13C]glucose labeling in an MDA-MB-231 triple negative breast cancer xenograft model. The in vitro effects of everolimus and metformin treatment on oxidative phosphorylation and glycolysis reflected changes in 13C-labeling of metabolites in MDA-MB-231 cells. Treatment of MDA-MB-231 xenografts in SCID/Beige mice with everolimus resulted in slower tumor growth and reduced tumor size and tumor viability by 35%. Metformin treatment moderately inhibited tumor growth but did not enhance everolimus-induced effects. High serum levels of everolimus were reached, whereas levels of metformin were relatively low. Everolimus decreased TCA cycle metabolite labeling and inhibited pyruvate carboxylase activity. Metformin only caused a mild reduction in glycolytic metabolite labeling and did not affect pyruvate carboxylase activity or TCA cycle metabolite labeling. In conclusion, treatment with everolimus, but not metformin, decreased tumor size and viability. Furthermore, the efficacy of everolimus was reflected in reduced 13C-labeling of TCA cycle intermediates and reduced pyruvate carboxylase activity. By using in-depth analysis of drug-induced changes in glucose metabolism in combination with measurement of drug levels in tumor and plasma, effects of metabolically targeted drugs can be explained, and novel targets can be identified.
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Affiliation(s)
- Gerke Ariaans
- Department of Medical Oncology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - Jiske F Tiersma
- Department of Medical Oncology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - Bernardus Evers
- Department of Pediatrics, Center for Liver, Digestive and Metabolic Diseases, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - Albert Gerding
- Department of Pediatrics, Center for Liver, Digestive and Metabolic Diseases, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - Stijn J H Waaijer
- Department of Medical Oncology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - Remco A Koster
- Department of Clinical Pharmacy and Pharmacology, Laboratory for Clinical and Forensic Toxicology and Drugs Analysis, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - Daan J Touw
- Department of Clinical Pharmacy and Pharmacology, Laboratory for Clinical and Forensic Toxicology and Drugs Analysis, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - Barbara M Bakker
- Department of Pediatrics, Center for Liver, Digestive and Metabolic Diseases, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - Dirk-Jan Reijngoud
- Department of Pediatrics, Center for Liver, Digestive and Metabolic Diseases, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - Steven de Jong
- Department of Medical Oncology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands.
| | - Mathilde Jalving
- Department of Medical Oncology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands.
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Buccoliero AM, Caporalini C, Moscardi S, Cetica V, Mei D, Conti V, Nozzoli F, Bonaudo C, Battista F, Giordano F, Mura R, Spacca B, Mussa F, D'Onofrio V, Guerrini R, Genitori L, Scagnet M. Leat-associated seizures the possible role of EAAT2, pyruvate carboxylase and glutamine synthetase. Epilepsy Res 2024; 199:107258. [PMID: 38086219 DOI: 10.1016/j.eplepsyres.2023.107258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 10/27/2023] [Accepted: 11/09/2023] [Indexed: 01/13/2024]
Abstract
BACKGROUND Drug-resistant epilepsy is a common condition in patients with brain neoplasms. The pathogenesis of tumor-associated seizures is poorly understood. Among the possible pathogenetic mechanisms, the increase in glutamate concentration has been proposed. Glutamate transporters, glutamine synthetase and pyruvate carboxylase are involved in maintaining the physiological concentration of glutamate in the intersynaptic spaces. In our previous research on angiocentric gliomas, we demonstrated that all tumors lacked the expression of the main glutamate transporter EAAT2, while the expression of glutamine synthetase and pyruvate carboxylase was mostly preserved. METHODS In the present study, we evaluated the immunohistochemical expression of EAAT2, glutamine synthetase and pyruvate carboxylase in a heterogeneous series of 25 long-term epilepsy-associated tumors (10 dysembryoplastic neuroepithelial tumors, 7 gangliogliomas, 3 subependymal giant cell astrocytomas, 3 rosette forming glioneuronal tumors, 1 diffuse astrocytoma MYB- or MYBL1-altered and 1 angiocentric glioma). In order to evaluate the incidence of variants in the SLC1A2 gene, encoding EAAT2, in a large number of central nervous system tumors we also queried the PedcBioPortal. RESULTS EAAT2 protein expression was lost in 9 tumors (36 %: 3 dysembryoplastic neuroepithelial tumors, 1 ganglioglioma, 3 subependymal giant cell astrocytomas, 1 diffuse astrocytoma MYB- or MYBL1-altered and 1 angiocentric glioma). Glutamine synthetase protein expression was completely lost in 2 tumors (8 %; 1 ganglioglioma and 1 diffuse astrocytoma MYB- or MYBL1-altered). All tumors of our series but rosette forming glioneuronal tumors (in which neurocytic cells were negative) were diffusely positive for pyruvate carboxylase. Consultation of the PedcBioPortal revealed that of 2307 pediatric brain tumors of different histotype and grade, 20 (< 1%) had variants in the SLC1A2 gene. Among the SLC1A2-mutated tumors, there were no angiocentric gliomas or other LEATs CONCLUSIONS: In conclusion, unlike angiocentric gliomas where the EAAT2 loss is typical and constant, the current study shows the loss of EAAT2 expression only in a fraction of the LEATs. In these cases, we may hypothesize some possible epileptogenic role of the EAAT2 loss. The retained expression of pyruvate carboxylase may contribute to determining a pathological glutamate excess unopposed by glutamine synthetase that resulted expressed to a variable extent in the majority of the tumors. Furthermore, we can assume that the EAAT2 loss in brain tumors in general and in LEATs in particular is more conceivably epigenetic.
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Affiliation(s)
| | | | - Selene Moscardi
- Pathology Unit, Meyer Children's Hospital IRCCS, Florence, Italy
| | - Valentina Cetica
- Department of Neurosciences, Psychology, Drug Research, and Child Health (NEUROFARBA), University of Florence, Meyer Children's Hospital IRCCS, Florence, Italy
| | - Davide Mei
- Department of Neurosciences, Psychology, Drug Research, and Child Health (NEUROFARBA), University of Florence, Meyer Children's Hospital IRCCS, Florence, Italy
| | - Valerio Conti
- Department of Neurosciences, Psychology, Drug Research, and Child Health (NEUROFARBA), University of Florence, Meyer Children's Hospital IRCCS, Florence, Italy
| | - Filippo Nozzoli
- Histopathology and Molecular Diagnostics, Careggi University Hospital, Florence, Italy
| | - Camilla Bonaudo
- Department of Neurosciences, Psychology, Drug Research, and Child Health (NEUROFARBA), Careggi University Hospital, Florence, Italy
| | - Francesca Battista
- Department of Neurosciences, Psychology, Drug Research, and Child Health (NEUROFARBA), Careggi University Hospital, Florence, Italy
| | - Flavio Giordano
- Department of Neurosciences, Psychology, Drug Research, and Child Health (NEUROFARBA), University of Florence, Meyer Children's Hospital IRCCS, Florence, Italy
| | - Regina Mura
- Department of Neurosurgery, Meyer Children's Hospital IRCCS, Florence, Italy
| | - Barbara Spacca
- Department of Neurosurgery, Meyer Children's Hospital IRCCS, Florence, Italy
| | - Federico Mussa
- Department of Neurosurgery, Meyer Children's Hospital IRCCS, Florence, Italy
| | | | - Renzo Guerrini
- Department of Neurosciences, Psychology, Drug Research, and Child Health (NEUROFARBA), University of Florence, Meyer Children's Hospital IRCCS, Florence, Italy
| | - Lorenzo Genitori
- Department of Neurosciences, Psychology, Drug Research, and Child Health (NEUROFARBA), Careggi University Hospital, Florence, Italy
| | - Mirko Scagnet
- Department of Neurosurgery, Meyer Children's Hospital IRCCS, Florence, Italy
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Li J, Yin Y, Zou J, Zhang E, Li Q, Chen L, Li J. The adipose-derived stem cell peptide ADSCP2 alleviates hypertrophic scar fibrosis via binding with pyruvate carboxylase and remodeling the metabolic landscape. Acta Physiol (Oxf) 2023; 238:e14010. [PMID: 37366253 DOI: 10.1111/apha.14010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Revised: 05/29/2023] [Accepted: 06/04/2023] [Indexed: 06/28/2023]
Abstract
AIM The purpose of this study was to investigate the function and mechanism of a novel peptide derived from adipose-derived stem cell-conditioned medium (ADSC-CM). METHODS Mass spectrometry was applied to identify expressed peptides in ADSC-CM obtained at different time points. The cell counting kit-8 assay and quantitative reverse transcription polymerase chain reactions were performed to screen the functional peptides contained within ADSC-CM. RNA-seq, western blot, a back skin excisional model of BALB/c mice, the peptide pull-down assay, rescue experiments, untargeted metabolomics, and mixOmics analysis were performed to thoroughly understand the functional mechanism of selected peptide. RESULTS A total of 93, 827, 1108, and 631 peptides were identified in ADSC-CM at 0, 24, 48, and 72 h of conditioning, respectively. A peptide named ADSCP2 (DENREKVNDQAKL) derived from ADSC-CM inhibited collagen and ACTA2 mRNAs in hypertrophic scar fibroblasts. Moreover, ADSCP2 facilitated wound healing and attenuated collagen deposition in a mouse model. ADSCP2 bound with the pyruvate carboxylase (PC) protein and inhibited PC protein expression. Overexpressing PC rescued the reduction in collagen and ACTA2 mRNAs caused by ADSCP2. Untargeted metabolomics identified 258 and 447 differential metabolites in the negative and positive mode, respectively, in the ADSCP2-treated group. The mixOmics analysis, which integrated RNA-seq and untargeted metabolomics data, provided a more holistic view of the functions of ADSCP2. CONCLUSION Overall, a novel peptide derived from ADSC-CM, named ADSCP2, attenuated hypertrophic scar fibrosis in vitro and in vivo, and the novel peptide ADSCP2 might be a promising drug candidate for clinical scar therapy.
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Affiliation(s)
- Jingyun Li
- Nanjing Maternal and Child Health Medical Institute, Women's Hospital of Nanjing Medical University (Nanjing Maternity and Child Health Care Hospital), Nanjing, China
| | - Yiliang Yin
- Department of Plastic & Cosmetic Surgery, Women's Hospital of Nanjing Medical University (Nanjing Maternity and Child Health Care Hospital), Nanjing, China
| | - Jijun Zou
- Department of Burns and Plastic Surgery, Children's Hospital of Nanjing Medical University, Nanjing, Jiangsu, China
| | - Enyuan Zhang
- Department of Plastic & Cosmetic Surgery, Women's Hospital of Nanjing Medical University (Nanjing Maternity and Child Health Care Hospital), Nanjing, China
| | - Qian Li
- Department of Plastic & Cosmetic Surgery, Women's Hospital of Nanjing Medical University (Nanjing Maternity and Child Health Care Hospital), Nanjing, China
| | - Ling Chen
- Department of Plastic & Cosmetic Surgery, Women's Hospital of Nanjing Medical University (Nanjing Maternity and Child Health Care Hospital), Nanjing, China
| | - Jun Li
- Department of Plastic & Cosmetic Surgery, Women's Hospital of Nanjing Medical University (Nanjing Maternity and Child Health Care Hospital), Nanjing, China
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Wu WZ, Ling-Hu T, Zhao YH, Zhao WD, Ji C, Tian JS, Ren Y, Qin XM. A unique insight for Xiaoyao San exerts antidepressant effects by modulating hippocampal glucose catabolism using stable isotope-resolved metabolomics. J Ethnopharmacol 2023; 300:115702. [PMID: 36099982 DOI: 10.1016/j.jep.2022.115702] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Revised: 08/14/2022] [Accepted: 09/02/2022] [Indexed: 06/15/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE In traditional Chinese medicine (TCM) theory, depression is an emotional disease, which is thought to be related to stagnation of liver qi and dysfunction of the spleen in transport. Xiaoyao San (XYS) is considered to have the effects of soothing liver-qi stagnation and invigorating the spleen. The spleen has the function to transport and transform nutrients. The liver has also termed the center of energy metabolism in the body. Therefore, exploring the antidepressant effects of XYS from the perspective of energy metabolism may reveal new findings. AIM OF THE STUDY Glucose catabolism is an important part of energy metabolism. In recent years, several researchers have found that XYS can exert antidepressant effects by modulating abnormalities in glucose catabolism-related metabolites. The previous research of our research group found that the hippocampus glucose catabolism was disordered in depression. However, the antidepressant potential of XYS through modulating the disorders of hippocampal glucose catabolism and the specific metabolic pathways and targets of XYS action were still unknown. The aim of this study was to address the above scientific questions. MATERIALS AND METHODS In this research, the CUMS (chronic unpredictable mild stress) model was used as the animal model of depression. The antidepressant effect of XYS was evaluated by behavioral indicators. The specific pathways and targets of XYS modulating the disorders of glucose catabolism in the hippocampus of CUMS rats were obtained by stable isotope-resolved metabolomics. Further, the isotope tracing results were also verified by molecular biology and electron transmission electron microscopy. RESULTS The results demonstrated that XYS pretreatment could significantly improve the depressive symptoms induced by CUMS. More importantly, it was found that XYS could modulate the disorders of glucose catabolism in the hippocampus of CUMS rats. Stable isotope-resolved metabolomics and enzyme activity tests showed that Lactate dehydrogenase (LDH), Pyruvate carboxylase (PC), and Pyruvate dehydrogenase (PDH) were targets of XYS for modulating the disorders of glucose catabolism in the hippocampus of CUMS rats. The Succinate dehydrogenase (SDH) and mitochondrial respiratory chain complex V (MRCC-Ⅴ) were targets of XYS to improve abnormal mitochondrial oxidative phosphorylation in the hippocampus of CUMS rats. XYS was also found to have the ability to improve the structural damage of mitochondria and nuclei in the hippocampal caused by CUMS. CONCLUSIONS This study was to explore the antidepressant effect of XYS from the perspective of glucose catabolism based on a strategy combining stable isotope tracing, molecular biology techniques, and transmission electron microscopy. We not only obtained the specific pathways and targets of XYS to improve the disorders of glucose catabolism in the hippocampus of CUMS rats, but also revealed the specific targets of the pathways of XYS compared with VLF.
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Affiliation(s)
- Wen-Ze Wu
- Modern Research Center for Traditional Chinese Medicine, Shanxi University, Taiyuan, 030006, Shanxi, China; The Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education, Shanxi University, Taiyuan, 030006, Shanxi, China; The Key Laboratory of Effective Substances Research and Utilization in TCM of Shanxi Province, China
| | - Ting Ling-Hu
- Modern Research Center for Traditional Chinese Medicine, Shanxi University, Taiyuan, 030006, Shanxi, China; The Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education, Shanxi University, Taiyuan, 030006, Shanxi, China; The Key Laboratory of Effective Substances Research and Utilization in TCM of Shanxi Province, China
| | - Yun-Hao Zhao
- Modern Research Center for Traditional Chinese Medicine, Shanxi University, Taiyuan, 030006, Shanxi, China; The Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education, Shanxi University, Taiyuan, 030006, Shanxi, China; The Key Laboratory of Effective Substances Research and Utilization in TCM of Shanxi Province, China
| | - Wei-di Zhao
- School of Physical Education, Shanxi University, Taiyuan Shanxi, 030006, China
| | - Cui Ji
- School of Physical Education, Shanxi University, Taiyuan Shanxi, 030006, China
| | - Jun-Sheng Tian
- Modern Research Center for Traditional Chinese Medicine, Shanxi University, Taiyuan, 030006, Shanxi, China; The Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education, Shanxi University, Taiyuan, 030006, Shanxi, China; The Key Laboratory of Effective Substances Research and Utilization in TCM of Shanxi Province, China.
| | - Yan Ren
- Department of Psychiatry, Shanxi Bethune Hospital, Shanxi Academy of Medical Sciences, Tongji Shanxi Hospital, Third Hospital of Shanxi Medical University, Taiyuan, 030032, China; Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.
| | - Xue-Mei Qin
- Modern Research Center for Traditional Chinese Medicine, Shanxi University, Taiyuan, 030006, Shanxi, China; The Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education, Shanxi University, Taiyuan, 030006, Shanxi, China; The Key Laboratory of Effective Substances Research and Utilization in TCM of Shanxi Province, China.
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EADIE GS, GALE GR. Studies of enzyme kinetics. I. The course of the reaction and the effect of a second addition of substrate on pyruvic carboxylase of yeast. Arch Biochem Biophys 1998; 93:37-42. [PMID: 13725470 DOI: 10.1016/0003-9861(61)90312-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Tanabe T, Takai T. [Structure of biotin-binding site of biotin-dependent carboxylases]. Seikagaku 1988; 60:41-4. [PMID: 2899127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Abstract
Sheep liver pyruvate carboxylase was mixed with avidin at a molar ratio of 1:1 in the presence of various combinations of the components of the assay systems required for either the acetyl-CoA-dependent or the acetyl-CoA-independent activity and negatively stained samples were examined by electron microscopy. Significant numbers of chain-like polymers of enzyme-avidin complexes were evident only when acetyl-CoA or high levels of pyruvate were present in the media. Similar results were also obtained for chicken liver pyruvate carboxylase despite this enzyme's almost complete lack of acetyl-CoA-independent activity. Thus, although acetyl-CoA and high concentrations of pyruvate may induce pyruvate carboxylase to adopt a 'tight' tetrahedron-like conformation which can interact with avidin to form chains, this structural change alone does not result in an enzymic form that is maximally active. This suggests that the allosteric activation of pyruvate carboxylase by acetyl-CoA is attributable, at least in part to more subtle conformational changes; especially in the case of the chicken enzyme.
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Allred JB, Goodson J. Does pyruvate carboxylase interfere with the radioactive bicarbonate fixation assay of acetyl-CoA carboxylase? Biochem J 1982; 208:247-8. [PMID: 6130758 PMCID: PMC1153954 DOI: 10.1042/bj2080247] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Abstract
Biotin responsive multiple carboxylase deficiency was suspected in a third trimester conceptus on the basis of enzymatic confirmation in fibroblasts cultured from an earlier sibling who suffered a demise in the immediate neonatal period. Maternal urinary organic acid profile was normal throughout the final 4 wk of pregnancy. Oral administration of biotin, 10 mg/day to the mother resulted in a 100-fold increase in urinary biotin excretion within 7 days. Urinary biotin excretion over the subsequent 2 wk decreased steadily, suggesting either decreased maternal absorption or increased fetal sequestration. After the birth of nonidentical twins, cord blood and urinary organic acid profiles of the infants were normal. However, cord blood biotin concentration was 4 to 7-fold that of normal newborns. Subsequent enzymatic and genetic complementation studies utilizing cultured skin fibroblasts from the infants demonstrated one of them to be affected by the multiple carboxylase defect, although he was clinically and biochemically normal throughout the neonatal period. Thus, prenatal therapy of this inborn enzymatic defect can be safely and effectively accomplished by administration of pharmacologic biotin doses in the last month of pregnancy.
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Abstract
Using negative staining and electron microscopic tilting techniques in conjunction with modelling experiments, the fine structure of chicken, sheep and rat pyruvate carboxylases has been studied. The overall configuration appears to be a tetrahedron-like structure consisting of two pairs of subunits in two different planes orthogonal to each other with the opposing pairs of subunits interacting with each other on their convex surfaces. The predominant form of the enzyme particles mounted and stained in the presence of acetyl-coenzyme A consisted of a compact, triangular outline enclosing three readily visible intensity maxima. When samples were mounted in the absence of acetyl-coenzyme A the molecules were more 'open' predominantly rhomboid structures. From tilting experiments it is concluded that the rhomboid images found in the absence of acetyl-coenzyme A represent partly or wholly flattened forms of the tetrahedron-like molecule. A feature of the enzyme when mounted in the absence of acetyl-coenzyme A was the existence of a 'cleft' along the longitudinal midline of each subunit, suggesting that the subunits may consist of two distinct domains.
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Cohen ND, Duc JA, Beegen H, Utter MF. Quaternary structure of pyruvate carboxylase from Pseudomonas citronellolis. J Biol Chem 1979; 254:9262-9. [PMID: 479194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Physical-chemical studies of pyruvate carboxylase from Pseudomonas citronellolis demonstrate that the enzyme has an alpha 4 beta 4 structure. The individual polypeptides, alpha (Mr = 65,000) and beta (Mr = 54,000), were separated and isolated by preparative gel electrophoresis. Analysis of the relationship between Coomassie blue staining and protein quantity for each polypeptide indicated that the alpha and beta subunits are present in a 1:1 stoichiometry in the native enzyme. Determinations of the molecular weight of the protein by sedimentation equilibrium (Mr = 454,000), gel filtration analysis (Mr = 510,000), disc gel electrophoresis (Mr = 530,000), and mass measurement from the Scanning Transmission Electron Microscope (Mr = 530,000) are consistent with the proposed alpha 4 beta 4 structure. Disc gel electrophoresis studies revealed that under certain circumstances the enzyme may dissociate to a smaller molecular weight species (Mr = 228,000). This dissociation phenomenon could explain the earlier reported observation of Taylor et al. ((1972) J. Biol. Chem 22, 7388-8390) that the enzyme had a molecular weight of 265,000. Evidence from electron microscopic studies shows that the three-dimensional structure of this enzyme is quite distinct from other species of pyruvate carboxylase. The enzyme does not show the typical rhombic appearance which has been noted for chicken liver, sheep liver, and yeast pyruvate carboxylase.
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Cohen ND, Utter MF, Wrigley NG, Barrett AN. Quaternary structure of yeast pyruvate carboxylase: biochemical and electron microscope studies. Biochemistry 1979; 18:2197-203. [PMID: 375971 DOI: 10.1021/bi00578a010] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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McGurk KS, Spivey HO. Ligand-induced conformational transitions and secondary structure composition of chicken liver pyruvate carboxylase. Biochem J 1979; 177:697-705. [PMID: 435260 PMCID: PMC1186422 DOI: 10.1042/bj1770697] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Apparent conformational transitions induced in chicken liver pyruvate carboxylase by substrates, KHCO(3) and MgATP, and the allosteric effector, acetyl-CoA, were studied by using the fluorescent probe, 8-anilinonaphthalene-1-sulphonic acid and c.d. Fluorescence measurements were made with both conventional and stopped-flow spectrophotometers. Additions of acetyl-CoA and/or ATP to the enzyme-probe solutions quenched fluorescence of the probe by the following cumulative amounts regardless of the sequence of additions: acetyl-CoA, 10-13%; ATP, 21-24%; acetyl-CoA plus ATP, about 35%. Additions of KHCO(3) had no effect on the fluorescence. The rates of quenching by acetyl-CoA and MgATP (in the presence of acetyl-CoA) were too rapid to measure by stopped-flow kinetic methods, but kinetics of the MgATP effect (in the absence of acetyl-CoA) indicate three unimolecular transitions after the association step. The negligible effect of the probe on enzyme catalytic activity, a preservation of the near-u.v. c.d. effect of MgATP and acetyl-CoA in the presence of the probe and no observable unimolecular transitions after binding of the probe to the enzyme indicate that the probe had no deleterious effect on the enzyme. In contrast with results with 8-anilinonaphthalene-1-sulphonic acid, fluorescence of the epsilon-derivative of acetyl-CoA or ATP [fluorescent analogues; Secrist, Barrio, Leonard & Weber (1972) Biochemistry11, 3499-3506] was not changed when either one was added to the enzyme. Secondary-structure composition of chicken liver pyruvate carboxylase estimated from the far-u.v. c.d. spectrum of the enzyme is 27% helix, 7% beta-pleated sheet and 66% other structural types.
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Rylatt DB, Keech DB, Wallace JC. Pyruvate carboxylase: the amino acid sequence at the biotin-attachment site of the enzymes isolated from chicken, turkey and sheep liver [proceedings]. Biochem Soc Trans 1977; 5:1544-6. [PMID: 923977 DOI: 10.1042/bst0051544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Rylatt DB, Keech DB, Wallace JC. Pyruvate carboxylase: isolation of the biotin-containing tryptic peptide and the determination of its primary sequency. Arch Biochem Biophys 1977; 183:113-22. [PMID: 562132 DOI: 10.1016/0003-9861(77)90425-8] [Citation(s) in RCA: 61] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Halestrap AP, Denton RM. The specificity and metabolic implications of the inhibition of pyruvate transport in isolated mitochondria and intact tissue preparations by alpha-Cyano-4-hydroxycinnamate and related compounds. Biochem J 1975; 148:97-106. [PMID: 1171687 PMCID: PMC1165510 DOI: 10.1042/bj1480097] [Citation(s) in RCA: 171] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
1. Effects of alpha-cyano-4-hydroxycinnamate and alpha-cyanocinnamate on a number of enzymes involved in pyruvate metabolism have been investigated. Little or no inhibition was observed of any enzyme at concentrations that inhibit completely mitochondrial pyruvate transport. At much higher concentrations (1 mM) some inhibition of pyruvate carboxylase was apparent. 2. Alpha-Cyano-4-hydroxycinnamate (1-100 muM) specifically inhibited pyruvate oxidation by mitochondria isolated from rat heart, brain, kidney and from blowfly flight muscle; oxidation of other substrates in the presence or absence of ADP was not affected. Similar concentrations of the compound also inhibited the carboxylation of pyruvate by rat liver mitochondria and the activation by pyruvate of pyruvate dehydrogenase in fat-cell mitochondria. These findings imply that pyruvate dehydrogenase, pyruvate dehydrogenase kinase and pyruvate carboxylase are exposed to mitochondrial matrix concentrations of pyruvate rather than to cytoplasmic concentrations. 3. Studies with whole-cell preparations incubated in vitro indicate that alpha-cyano-4-hydroxycinnamate or alpha-cyanocinnamate (at concentrations below 200 muM) can be used to specifically inhibit mitochondrial pyruvate transport within cells and thus alter the metabolic emphasis of the preparation. In epididymal fat-pads, fatty acid synthesis from glucose and fructose, but not from acetate, was markedly inhibited. No changes in tissue ATP concentrations were observed. The effects on fatty acid synthesis were reversible. In kidney-cortex slices, gluconeogenesis from pyruvate and lactate but not from succinate was inhibited. In the rat heart perfused with medium containing glucose and insulin, addition of alpha-cyanocinnamate (200 muM) greatly increased the output and tissue concentrations of lactate plus pyruvate but decreased the lactate/pyruvate ratio. 4. The inhibition by cyanocinnamate derivatives of pyruvate transport across the cell membrane of human erythrocytes requires much higher concentrations of the derivatives than the inhibition of transport across the mitochondrial membrane. Alpha-Cyano-4-hydroxycinnamate appears to enter erythrocytes on the cell-membrane pyruvate carrier. Entry is not observed in the presence of albumin, which may explain the small effects when these compounds are injected into whole animals.
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SCRUTTON MC, KEECH DB, UTTER MF. PYRUVATE CARBOXYLASE. IV. PARTIAL REACTIONS AND THE LOCUS OF ACTIVATION BY ACETYL COENZYME A. J Biol Chem 1965; 240:574-81. [PMID: 14275106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/26/2023] Open
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SCRUTTON MC, UTTER MF. PYRUVATE CARBOXYLASE. 3. SOME PHYSICAL AND CHEMICAL PROPERTIES OF THE HIGHLY PURIFIED ENZYME. J Biol Chem 1965; 240:1-9. [PMID: 14253413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/26/2023] Open
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HENNING HV, SEUBERT W. [ON THE MECHANISM OF GLUCONEOGENESIS AND ITS REGULATION. I. QUANTITATIVE DETERMINATION OF PYRUVATE CARBOXYLASE IN RAW EXTRACTS OF RAT LIVER]. Biochem Z 1964; 340:160-70. [PMID: 14303383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/26/2023]
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COPE FW. A GENERALIZED THEORY OF PARTICULATE ELECTRON CONDUCTION ENZYMES APPLIED TO CYTOCHROME OXIDASE. A THEORY OF COUPLED ELECTRON AND/ OR ION TRANSPORT APPLIED TO PYRUVATE CARBOXYLASE. NADC-ML-6405. NADC-MR Rep 1964; 126:1-26. [PMID: 14252935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/26/2023]
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KEECH DB, UTTER MF. PYRUVATE CARBOXYLASE. II. PROPERTIES. J Biol Chem 1963; 238:2609-14. [PMID: 14063280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/25/2023] Open
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