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Fuentes-Lemus E, Reyes JS, Figueroa JD, Davies MJ, López-Alarcón C. The enzymes of the oxidative phase of the pentose phosphate pathway as targets of reactive species: consequences for NADPH production. Biochem Soc Trans 2023; 51:2173-2187. [PMID: 37971161 DOI: 10.1042/bst20231027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 10/31/2023] [Accepted: 11/06/2023] [Indexed: 11/19/2023]
Abstract
The pentose phosphate pathway (PPP) is a key metabolic pathway. The oxidative phase of this process involves three reactions catalyzed by glucose-6-phosphate dehydrogenase (G6PDH), 6-phosphogluconolactonase (6PGL) and 6-phosphogluconate dehydrogenase (6PGDH) enzymes. The first and third steps (catalyzed by G6PDH and 6PGDH, respectively) are responsible for generating reduced nicotinamide adenine dinucleotide phosphate (NAPDH), a key cofactor for maintaining the reducing power of cells and detoxification of both endogenous and exogenous oxidants and electrophiles. Despite the importance of these enzymes, little attention has been paid to the fact that these proteins are targets of oxidants. In response to oxidative stimuli metabolic pathways are modulated, with the PPP often up-regulated in order to enhance or maintain the reductive capacity of cells. Under such circumstances, oxidation and inactivation of the PPP enzymes could be detrimental. Damage to the PPP enzymes may result in a downward spiral, as depending on the extent and sites of modification, these alterations may result in a loss of enzymatic activity and therefore increased oxidative damage due to NADPH depletion. In recent years, it has become evident that the three enzymes of the oxidative phase of the PPP have different susceptibilities to inactivation on exposure to different oxidants. In this review, we discuss existing knowledge on the role that these enzymes play in the metabolism of cells, and their susceptibility to oxidation and inactivation with special emphasis on NADPH production. Perspectives on achieving a better understanding of the molecular basis of the oxidation these enzymes within cellular environments are given.
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Affiliation(s)
- Eduardo Fuentes-Lemus
- Department of Biomedical Sciences, Panum Institute, University of Copenhagen, Copenhagen, Denmark
| | - Juan Sebastián Reyes
- Departamento de Química Física, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Juan David Figueroa
- Departamento de Química Física, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Michael J Davies
- Department of Biomedical Sciences, Panum Institute, University of Copenhagen, Copenhagen, Denmark
| | - Camilo López-Alarcón
- Departamento de Química Física, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago, Chile
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Reyes JS, Fuentes-Lemus E, Romero J, Arenas F, Fierro A, Davies MJ, López-Alarcón C. Peroxyl radicals modify 6-phosphogluconolactonase from Escherichia coli via oxidation of specific amino acids and aggregation which inhibits enzyme activity. Free Radic Biol Med 2023; 204:118-127. [PMID: 37119864 DOI: 10.1016/j.freeradbiomed.2023.04.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 04/21/2023] [Accepted: 04/26/2023] [Indexed: 05/01/2023]
Abstract
6-phosphogluconolactonase (6PGL) catalyzes the second reaction of the pentose phosphate pathway (PPP) converting 6-phosphogluconolactone to 6-phosphogluconate. The PPP is critical to the generation of NADPH and metabolic intermediates, but some of its components are susceptible to oxidative inactivation. Previous studies have characterized damage to the first (glucose-6-phosphate dehydrogenase) and third (6-phosphogluconate dehydrogenase) enzymes of the pathway, but no data are available for 6PGL. This knowledge gap is addressed here. Oxidation of Escherichia coli 6PGL by peroxyl radicals (ROO•, from AAPH (2,2'-azobis(2-methylpropionamidine) dihydrochloride) was examined using SDS-PAGE, amino acid consumption, liquid chromatography with mass detection (LC-MS), protein carbonyl formation and computational methods. NADPH generation was assessed using mixtures all three enzymes of the oxidative phase of the PPP. Incubation of 6PGL with 10 or 100 mM AAPH resulted in protein aggregation mostly due to reducible (disulfide) bonds. High fluxes of ROO• induced consumption of Cys, Met and Trp, with the Cys oxidation rationalizing the aggregate formation. Low levels of carbonyls were detected, while LC-MS analyses provided evidence for oxidation of selected Trp and Met residues (Met1, Trp18, Met41, Trp203, Met220 and Met221). ROO• elicited little loss of enzymatic activity of monomeric 6PGL, but the aggregates showed diminished NADPH generation. This is consistent with in silico analyses that indicate that the modified Trp and Met are far from the 6-phosphogluconolactone binding site and the catalytic dyad (His130 and Arg179). Together these data indicate that monomeric 6PGL is a robust enzyme towards oxidative inactivation by ROO• and when compared to other PPP enzymes.
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Affiliation(s)
- Juan Sebastián Reyes
- Departamento de Química Física, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Chile
| | - Eduardo Fuentes-Lemus
- Department of Biomedical Sciences, Panum Institute, University of Copenhagen, Denmark
| | - Jefferson Romero
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Chile
| | - Felipe Arenas
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Chile
| | - Angélica Fierro
- Departamento de Química Orgánica, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Chile
| | - Michael J Davies
- Department of Biomedical Sciences, Panum Institute, University of Copenhagen, Denmark
| | - Camilo López-Alarcón
- Departamento de Química Física, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Chile.
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Li Y, Adur MK, Lonergan SM, Keating AF, Ross JW. MicroRNA21 inhibition affects porcine oocyte maturation and alters protein expression critical for metabolic pathway function. Mol Reprod Dev 2022; 89:443-458. [PMID: 36001642 PMCID: PMC9804257 DOI: 10.1002/mrd.23641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Revised: 06/08/2022] [Accepted: 08/12/2022] [Indexed: 01/05/2023]
Abstract
MicroRNA21 (MIR21) abundance in porcine oocytes and cumulus cells increases during in vitro maturation. The mechanism by which MIR21 regulates oocyte maturation and the effect on the developmental competence of subsequent embryos remains unclear. The objective of this study was to assess the function of MIR21 during porcine oocyte maturation and its effect on embryonic development. Treatment with peptide nucleic acid MIR21 inhibitor (MIR21-PNA), designed to specifically bind to and prevent MIR21 activity during in vitro oocyte maturation, decreased cumulus cell expansion, and the oocyte ability to achieve metaphase II maturation stage when compared to control groups. Following parthenogenetic activation, the cleavage rate at 48 h in the MIR21-PNA group was decreased (p ≤ 0.03) relative to the control groups. Additionally, liquid chromatography-mass spectrometry (LC-MS/MS) of oocyte and cumulus cell total protein following MIR21-PNA treatment during in vitro maturation identified changes in signaling pathways with primary involvement of glucose metabolism (GM) pathways. Furthermore, there was no difference (p = 0.21) in oocyte maturation of control and MIR21-PNA treated oocytes when cultured in pyruvate lacking medium. Finally, MIR21-PNA treatment decreased (p = 0.04) glutathione and increased (p = 0.07) reactive oxygen species production in the oocyte. These data suggest that MIR21 influences porcine oocyte maturation by regulating GM pathways in the cumulus-oocyte complex.
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Affiliation(s)
- Yunsheng Li
- Department of Animal ScienceIowa State UniversityAmesIowaUSA,College of Animal Science and TechnologyAnhui Agricultural UniversityHefeiChina
| | | | | | | | - Jason W. Ross
- Department of Animal ScienceIowa State UniversityAmesIowaUSA
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Dhumal TT, Kumar R, Paul A, Roy PK, Garg P, Singh S. Molecular explorations of the Leishmania donovani 6-phosphogluconolactonase enzyme, a key player in the pentose phosphate pathway. Biochimie 2022; 202:212-225. [PMID: 36037881 DOI: 10.1016/j.biochi.2022.08.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2022] [Revised: 07/12/2022] [Accepted: 08/09/2022] [Indexed: 11/18/2022]
Abstract
The enzymes of the pentose phosphate pathway are vital to survival in kinetoplastids. The second step of the pentose phosphate pathway involves hydrolytic cleavage of 6-phosphogluconolactone to 6-phosphogluconic acid by 6- phosphogluconolactonase (6PGL). In the present study, Leishmania donovani 6PGL (Ld6PGL) was cloned and overexpressed in bacterial expression system. Comparative sequence analysis revealed the conserved sequence motifs, functionally and structurally important residues in 6PGL family. In silico amino acid substitution study and interacting partners of 6PGL were predicted. The Ld6PGL enzyme was found to be active in the assay and in the parasites. Specificity was confirmed by western blot analysis. The ∼30 kDa protein was found to be a dimer in MALDI, glutaraldehyde crosslinking and size exclusion chromatography studies. Kinetic analysis and structural stability studies of Ld6PGL were performed with denaturants and at varied temperature. Computational 3D Structural modelling of Ld6PGL elucidates that it has a similar α/β hydrolase fold structural topology as in other members of 6PGL family. The three loops are found in extended form when the structure is compared with the human 6PGL (Hs6PGL). Further, enzyme substrate binding mode and its mechanism were investigated using the molecular docking and molecular simulation studies. Interesting dynamics action of substrate 6-phosphogluconolactone was observed into active site during MD simulation. Interesting differences were observed between host and parasite enzyme which pointed towards its potential to be explored as an antileishmanial drug target. This study forms the basis for further analysis of the role of Ld6PGL in combating oxidative stress in Leishmania.
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Affiliation(s)
- Tushar Tukaram Dhumal
- Department of Biotechnology, National Institute of Pharmaceutical Education and Research, SAS Nagar, Mohali, 160062, Punjab, India
| | - Rajender Kumar
- Department of Clinical Microbiology, Umeå University, SE-90185, Umeå, Sweden
| | - Anindita Paul
- Department of Biotechnology, National Institute of Pharmaceutical Education and Research, SAS Nagar, Mohali, 160062, Punjab, India
| | - Pradyot Kumar Roy
- Department of Biotechnology, National Institute of Pharmaceutical Education and Research, SAS Nagar, Mohali, 160062, Punjab, India
| | - Prabha Garg
- Department of Pharmacoinformatics, National Institute of Pharmaceutical Education and Research, SAS Nagar, Mohali, 160062, Punjab, India
| | - Sushma Singh
- Department of Biotechnology, National Institute of Pharmaceutical Education and Research, SAS Nagar, Mohali, 160062, Punjab, India.
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Alfarouk KO, Ahmed SBM, Elliott RL, Benoit A, Alqahtani SS, Ibrahim ME, Bashir AHH, Alhoufie STS, Elhassan GO, Wales CC, Schwartz LH, Ali HS, Ahmed A, Forde PF, Devesa J, Cardone RA, Fais S, Harguindey S, Reshkin SJ. The Pentose Phosphate Pathway Dynamics in Cancer and Its Dependency on Intracellular pH. Metabolites 2020; 10:E285. [PMID: 32664469 PMCID: PMC7407102 DOI: 10.3390/metabo10070285] [Citation(s) in RCA: 56] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Revised: 07/02/2020] [Accepted: 07/06/2020] [Indexed: 12/21/2022] Open
Abstract
The Pentose Phosphate Pathway (PPP) is one of the key metabolic pathways occurring in living cells to produce energy and maintain cellular homeostasis. Cancer cells have higher cytoplasmic utilization of glucose (glycolysis), even in the presence of oxygen; this is known as the "Warburg Effect". However, cytoplasmic glucose utilization can also occur in cancer through the PPP. This pathway contributes to cancer cells by operating in many different ways: (i) as a defense mechanism via the reduced form of nicotinamide adenine dinucleotide phosphate (NADPH) to prevent apoptosis, (ii) as a provision for the maintenance of energy by intermediate glycolysis, (iii) by increasing genomic material to the cellular pool of nucleic acid bases, (iv) by promoting survival through increasing glycolysis, and so increasing acid production, and (v) by inducing cellular proliferation by the synthesis of nucleic acid, fatty acid, and amino acid. Each step of the PPP can be upregulated in some types of cancer but not in others. An interesting aspect of this metabolic pathway is the shared regulation of the glycolytic and PPP pathways by intracellular pH (pHi). Indeed, as with glycolysis, the optimum activity of the enzymes driving the PPP occurs at an alkaline pHi, which is compatible with the cytoplasmic pH of cancer cells. Here, we outline each step of the PPP and discuss its possible correlation with cancer.
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Affiliation(s)
- Khalid O. Alfarouk
- Alfarouk Biomedical Research LLC, Temple Terrace, FL 33617, USA
- American Biosciences Inc., New York, NY 10913, USA;
- Al-Ghad International College for Applied Medical Sciences, Al-Madinah Al-Munawarah 42316, Saudi Arabia
| | | | - Robert L. Elliott
- The Elliott-Elliott-Baucom Breast Cancer Research and Treatment Center, Baton Rouge, LA 70806, USA;
- The Sallie A. Burdine Breast Foundation, Baton Rouge, LA 70806, USA;
| | - Amanda Benoit
- The Sallie A. Burdine Breast Foundation, Baton Rouge, LA 70806, USA;
| | - Saad S. Alqahtani
- Clinical Pharmacy Department, College of Pharmacy, Jazan University, Jazan 45142, Saudi Arabia;
| | - Muntaser E. Ibrahim
- Institute of Endemic Diseases, University of Khartoum, Khartoum 11111, Sudan; (M.E.I.); (A.H.H.B.)
| | - Adil H. H. Bashir
- Institute of Endemic Diseases, University of Khartoum, Khartoum 11111, Sudan; (M.E.I.); (A.H.H.B.)
| | - Sari T. S. Alhoufie
- Department of Clinical Laboratory Sciences, Faculty of Applied Medical Sciences, Taibah University, Al-Madinah Al-Munwarah 42353, Saudi Arabia;
| | - Gamal O. Elhassan
- Unaizah College of Pharmacy, Qassim University, Unaizah 56264, Saudi Arabia;
| | | | | | - Heyam S. Ali
- Department of Pharmaceutics, Faculty of Pharmacy, University of Khartoum, Khartoum 11111, Sudan;
| | - Ahmed Ahmed
- Department of Oesphogastric and General Surgery, University Hospitals of Leicester, Leicester LE5 4PW, UK;
| | - Patrick F. Forde
- CancerResearch@UCC, Western Gateway Building, University College Cork, Cork T12 XF62, Ireland;
| | - Jesus Devesa
- Scientific Direction, Foltra Medical Centre, Travesía de Montouto 24, 15886 Teo, Spain;
| | - Rosa A. Cardone
- Department of Biosciences, Biotechnologies, and Biopharmaceutics, University of Bari, 90126 Bari, Italy; (R.A.C.); (S.J.R.)
| | - Stefano Fais
- Department of Oncology and Molecular Medicine, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Rome, Italy;
| | - Salvador Harguindey
- Department of Oncology, Institute for Clinical Biology and Metabolism, 01004 Vitoria, Spain;
| | - Stephan J. Reshkin
- Department of Biosciences, Biotechnologies, and Biopharmaceutics, University of Bari, 90126 Bari, Italy; (R.A.C.); (S.J.R.)
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Calligari P, Torsello M, Bortoli M, Orian L, Polimeno A. Modelling of Ca2+-promoted structural effects in wild type and post-translationally modified Connexin26. MOLECULAR SIMULATION 2019. [DOI: 10.1080/08927022.2019.1690653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Paolo Calligari
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, Padova, Italy
| | - Mauro Torsello
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, Padova, Italy
| | - Marco Bortoli
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, Padova, Italy
| | - Laura Orian
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, Padova, Italy
| | - Antonino Polimeno
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, Padova, Italy
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