1
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Matés JM, Campos-Sandoval JA, de Los Santos-Jiménez J, Segura JA, Alonso FJ, Márquez J. Metabolic Reprogramming of Cancer by Chemicals that Target Glutaminase Isoenzymes. Curr Med Chem 2020; 27:5317-5339. [PMID: 31038055 DOI: 10.2174/0929867326666190416165004] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Revised: 03/19/2019] [Accepted: 03/31/2019] [Indexed: 02/06/2023]
Abstract
BACKGROUND Metabolic reprogramming of tumours is a hallmark of cancer. Among the changes in the metabolic network of cancer cells, glutaminolysis is a key reaction altered in neoplasms. Glutaminase proteins control the first step in glutamine metabolism and their expression correlates with malignancy and growth rate of a great variety of cancers. The two types of glutaminase isoenzymes, GLS and GLS2, differ in their expression patterns and functional roles: GLS has oncogenic properties and GLS2 has been described as a tumour suppressor factor. RESULTS We have focused on glutaminase connections with key oncogenes and tumour suppressor genes. Targeting glutaminase isoenzymes includes different strategies aimed at deactivating the rewiring of cancer metabolism. In addition, we found a long list of metabolic enzymes, transcription factors and signalling pathways dealing with glutaminase. On the other hand, a number of chemicals have been described as isoenzyme-specific inhibitors of GLS and/or GLS2 isoforms. These molecules are being characterized as synergic and therapeutic agents in many types of tumours. CONCLUSION This review states the metabolic pathways that are rewired in cancer, the roles of glutaminase isoforms in cancer, as well as the metabolic circuits regulated by glutaminases. We also show the plethora of anticancer drugs that specifically inhibit glutaminase isoenzymes for treating several sets of cancer.
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Affiliation(s)
- José M Matés
- Instituto de Investigacion Biomedica de Malaga (IBIMA), Department of Molecular Biology and Biochemistry, Canceromics Lab, Faculty of Sciences, Campus de Teatinos, University of Malaga, 29071 Malaga, Spain
| | - José A Campos-Sandoval
- Instituto de Investigacion Biomedica de Malaga (IBIMA), Department of Molecular Biology and Biochemistry, Canceromics Lab, Faculty of Sciences, Campus de Teatinos, University of Malaga, 29071 Malaga, Spain
| | - Juan de Los Santos-Jiménez
- Instituto de Investigacion Biomedica de Malaga (IBIMA), Department of Molecular Biology and Biochemistry, Canceromics Lab, Faculty of Sciences, Campus de Teatinos, University of Malaga, 29071 Malaga, Spain
| | - Juan A Segura
- Instituto de Investigacion Biomedica de Malaga (IBIMA), Department of Molecular Biology and Biochemistry, Canceromics Lab, Faculty of Sciences, Campus de Teatinos, University of Malaga, 29071 Malaga, Spain
| | - Francisco J Alonso
- Instituto de Investigacion Biomedica de Malaga (IBIMA), Department of Molecular Biology and Biochemistry, Canceromics Lab, Faculty of Sciences, Campus de Teatinos, University of Malaga, 29071 Malaga, Spain
| | - Javier Márquez
- Instituto de Investigacion Biomedica de Malaga (IBIMA), Department of Molecular Biology and Biochemistry, Canceromics Lab, Faculty of Sciences, Campus de Teatinos, University of Malaga, 29071 Malaga, Spain
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2
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Matés JM, Di Paola FJ, Campos-Sandoval JA, Mazurek S, Márquez J. Therapeutic targeting of glutaminolysis as an essential strategy to combat cancer. Semin Cell Dev Biol 2019; 98:34-43. [PMID: 31100352 DOI: 10.1016/j.semcdb.2019.05.012] [Citation(s) in RCA: 80] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Revised: 05/11/2019] [Accepted: 05/13/2019] [Indexed: 01/08/2023]
Abstract
Metabolic reprogramming in cancer targets glutamine metabolism as a key mechanism to provide energy, biosynthetic precursors and redox requirements to allow the massive proliferation of tumor cells. Glutamine is also a signaling molecule involved in essential pathways regulated by oncogenes and tumor suppressor factors. Glutaminase isoenzymes are critical proteins to control glutaminolysis, a key metabolic pathway for cell proliferation and survival that directs neoplasms' fate. Adaptive glutamine metabolism can be altered by different metabolic therapies, including the use of specific allosteric inhibitors of glutaminase that can evoke synergistic effects for the therapy of cancer patients. We also review other clinical applications of in vivo assessment of glutaminolysis by metabolomic approaches, including diagnosis and monitoring of cancer.
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Affiliation(s)
- José M Matés
- Instituto de Investigación Biomédica de Málaga (IBIMA), Department of Molecular Biology and Biochemistry, Faculty of Sciences, University of Málaga, E-29071 Málaga, Spain
| | - Floriana J Di Paola
- Institute of Veterinary Physiology and Biochemistry, Justus Liebig University of Giessen, D-35392 Giessen, Germany
| | - José A Campos-Sandoval
- Instituto de Investigación Biomédica de Málaga (IBIMA), Department of Molecular Biology and Biochemistry, Faculty of Sciences, University of Málaga, E-29071 Málaga, Spain
| | - Sybille Mazurek
- Institute of Veterinary Physiology and Biochemistry, Justus Liebig University of Giessen, D-35392 Giessen, Germany
| | - Javier Márquez
- Instituto de Investigación Biomédica de Málaga (IBIMA), Department of Molecular Biology and Biochemistry, Faculty of Sciences, University of Málaga, E-29071 Málaga, Spain.
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3
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Chaudhary BP, Dahal SR, Sayania B, Kumar A, Mohanty S. Effect of Toxic Metal Binding on Tax-Interacting Protein1 (TIP1): A Protein Related to Brain Diseases. Nat Prod Commun 2019. [DOI: 10.1177/1934578x19849161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Human tax-interacting protein1 (TIP1), also known as glutaminase-interacting protein (GIP), is a small globular protein containing a PDZ domain. PDZ domains are the most common protein-protein interaction modules present in eukaryotes. In humans, TIP1 plays a very important role in many cellular pathways including β-catenin-mediated Wnt signaling, Rho-activator rhotekin-mediated Rho signaling pathway, and glutamate signaling pathway for the normal activity of the central nervous system. TIP1 also regulates potassium channel expression in the plasma membrane and is a binding partner to many proteins including viral oncoproteins, HTLV-1 Tax and HPV16 E6. Since TIP1 is at a pivotal point in many cellular processes through its interaction with a growing list of partner proteins, any impact on the proper functioning of this protein can have severe consequences on the well-being of a living system. Although metals are essential for plants and animals in trace amounts, elevated levels of heavy metals such as arsenic, cadmium, zinc, and lead are toxic causing various health problems including cardiovascular disorders, neuronal damage, renal injuries, and cancer. Here, we report the effect of heavy metals, arsenic and cadmium, on TIP1 conformation using circular dichroism and fluorescence spectroscopy techniques. Our study revealed these metals have a significant impact on the structure of TIP1 even at very low levels.
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Affiliation(s)
| | - Salik R. Dahal
- Department of Chemistry, Oklahoma State University, Stillwater, OK, USA
| | | | - Amit Kumar
- Department of Chemistry, Oklahoma State University, Stillwater, OK, USA
| | - Smita Mohanty
- Department of Chemistry, Oklahoma State University, Stillwater, OK, USA
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4
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Transfection with GLS2 Glutaminase (GAB) Sensitizes Human Glioblastoma Cell Lines to Oxidative Stress by a Common Mechanism Involving Suppression of the PI3K/AKT Pathway. Cancers (Basel) 2019; 11:cancers11010115. [PMID: 30669455 PMCID: PMC6356507 DOI: 10.3390/cancers11010115] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2018] [Revised: 01/16/2019] [Accepted: 01/17/2019] [Indexed: 01/23/2023] Open
Abstract
GLS-encoded glutaminase promotes tumorigenesis, while GLS2-encoded glutaminase displays tumor-suppressive properties. In glioblastoma (GBM), the most aggressive brain tumor, GLS is highly expressed and in most cases GLS2 is silenced. Previously, it was shown that transfection with a sequence encoding GAB, the main GLS2 isoform, decreased the survival, growth, and ability to migrate of human GBM cells T98G and increased their sensitivity towards an alkylating agent temozolomide (TMZ) and oxidative stress compared to the controls, by a not well-defined mechanism. In this study we report that GAB transfection inhibits growth and increases susceptibility towards TMZ and H2O2-mediated oxidative stress of two other GBM cell lines, U87MG and LN229. We also show that in GAB-transfected cells treated with H2O2, the PI3K/AKT pathway is less induced compared to the pcDNA-transfected counterparts and that pretreatment with PDGF-BB, an activator of AKT, protects GAB-transfected cells from death caused by the H2O2 treatment. In conclusion, our results show that (i) GAB suppresses the malignant phenotype of the GBM cells of different tumorigenic potentials and genetic backgrounds and (ii) the GAB-mediated increase of sensitivity to oxidative stress is causally related to the inhibition of the PI3K/AKT pathway. The upregulation of the GLS2 expression and the inhibition of the PI3K/AKT pathway may become a novel combined therapeutic strategy for anti-glioma preclinical investigations.
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5
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de Guzzi Cassago CA, Dias MM, Pinheiro MP, Pasquali CC, Bastos ACS, Islam Z, Consonni SR, de Oliveira JF, Gomes EM, Ascenção CFR, Honorato R, Pauletti BA, Indolfo NDC, Filho HVR, de Oliveira PSL, Figueira ACM, Paes Leme AF, Ambrosio ALB, Dias SMG. Glutaminase Affects the Transcriptional Activity of Peroxisome Proliferator-Activated Receptor γ (PPARγ) via Direct Interaction. Biochemistry 2018; 57:6293-6307. [PMID: 30295466 DOI: 10.1021/acs.biochem.8b00773] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Phosphate-activated glutaminases catalyze the deamidation of glutamine to glutamate and play key roles in several physiological and pathological processes. In humans, GLS encodes two multidomain splicing isoforms: KGA and GAC. In both isoforms, the canonical glutaminase domain is flanked by an N-terminal region that is folded into an EF-hand-like four-helix bundle. However, the splicing event replaces a well-structured three-repeat ankyrin domain in KGA with a shorter, unordered C-terminal stretch in GAC. The multidomain architecture, which contains putative protein-protein binding motifs, has led to speculation that glutaminases are involved in cellular processes other than glutamine metabolism; in fact, some proteins have been identified as binding partners of KGA and the isoforms of its paralogue gene, GLS2. Here, a yeast two-hybrid assay identified nuclear receptor peroxisome proliferator-activated receptor γ (PPARγ) as a new binding partner of the glutaminase. We show that KGA and GAC directly bind PPARγ with a low-micromolar dissociation constant; the interaction involves the N-terminal and catalytic domains of glutaminases as well as the ligand-binding domain of the nuclear receptor. The interaction occurs within the nucleus, and by sequestering PPARγ from its responsive element DR1, the glutaminases decreased nuclear receptor activity as assessed by a luciferase reporter assay. Altogether, our findings reveal an unexpected glutaminase-binding partner and, for the first time, directly link mitochondrial glutaminases to an unanticipated role in gene regulation.
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Affiliation(s)
- Carolina Aparecida de Guzzi Cassago
- Brazilian Biosciences National Laboratory (LNBio) , Brazilian Center for Research in Energy and Materials (CNPEM) , Campinas , Sao Paulo 13083-970 , Brazil
| | - Marília Meira Dias
- Brazilian Biosciences National Laboratory (LNBio) , Brazilian Center for Research in Energy and Materials (CNPEM) , Campinas , Sao Paulo 13083-970 , Brazil
| | - Matheus Pinto Pinheiro
- Brazilian Biosciences National Laboratory (LNBio) , Brazilian Center for Research in Energy and Materials (CNPEM) , Campinas , Sao Paulo 13083-970 , Brazil
| | - Camila Cristina Pasquali
- Brazilian Biosciences National Laboratory (LNBio) , Brazilian Center for Research in Energy and Materials (CNPEM) , Campinas , Sao Paulo 13083-970 , Brazil
| | - Alliny Cristiny Silva Bastos
- Brazilian Biosciences National Laboratory (LNBio) , Brazilian Center for Research in Energy and Materials (CNPEM) , Campinas , Sao Paulo 13083-970 , Brazil.,Graduate Program in Genetics and Molecular Biology, Institute of Biology , University of Campinas (UNICAMP) , Campinas , Sao Paulo 13083-970 , Brazil
| | - Zeyaul Islam
- Brazilian Biosciences National Laboratory (LNBio) , Brazilian Center for Research in Energy and Materials (CNPEM) , Campinas , Sao Paulo 13083-970 , Brazil
| | - Sílvio Roberto Consonni
- Department of Biochemistry and Tissue Biology , University of Campinas , Campinas , Sao Paulo 13083-872 , Brazil
| | - Juliana Ferreira de Oliveira
- Brazilian Biosciences National Laboratory (LNBio) , Brazilian Center for Research in Energy and Materials (CNPEM) , Campinas , Sao Paulo 13083-970 , Brazil
| | - Emerson Machi Gomes
- Brazilian Biosciences National Laboratory (LNBio) , Brazilian Center for Research in Energy and Materials (CNPEM) , Campinas , Sao Paulo 13083-970 , Brazil
| | - Carolline Fernanda Rodrigues Ascenção
- Brazilian Biosciences National Laboratory (LNBio) , Brazilian Center for Research in Energy and Materials (CNPEM) , Campinas , Sao Paulo 13083-970 , Brazil.,Graduate Program in Genetics and Molecular Biology, Institute of Biology , University of Campinas (UNICAMP) , Campinas , Sao Paulo 13083-970 , Brazil
| | - Rodrigo Honorato
- Brazilian Biosciences National Laboratory (LNBio) , Brazilian Center for Research in Energy and Materials (CNPEM) , Campinas , Sao Paulo 13083-970 , Brazil
| | - Bianca Alves Pauletti
- Brazilian Biosciences National Laboratory (LNBio) , Brazilian Center for Research in Energy and Materials (CNPEM) , Campinas , Sao Paulo 13083-970 , Brazil
| | - Nathalia de Carvalho Indolfo
- Brazilian Biosciences National Laboratory (LNBio) , Brazilian Center for Research in Energy and Materials (CNPEM) , Campinas , Sao Paulo 13083-970 , Brazil
| | - Helder Veras Ribeiro Filho
- Brazilian Biosciences National Laboratory (LNBio) , Brazilian Center for Research in Energy and Materials (CNPEM) , Campinas , Sao Paulo 13083-970 , Brazil
| | - Paulo Sergio Lopes de Oliveira
- Brazilian Biosciences National Laboratory (LNBio) , Brazilian Center for Research in Energy and Materials (CNPEM) , Campinas , Sao Paulo 13083-970 , Brazil
| | - Ana Carolina Migliorini Figueira
- Brazilian Biosciences National Laboratory (LNBio) , Brazilian Center for Research in Energy and Materials (CNPEM) , Campinas , Sao Paulo 13083-970 , Brazil
| | - Adriana Franco Paes Leme
- Brazilian Biosciences National Laboratory (LNBio) , Brazilian Center for Research in Energy and Materials (CNPEM) , Campinas , Sao Paulo 13083-970 , Brazil
| | - Andre Luis Berteli Ambrosio
- Brazilian Biosciences National Laboratory (LNBio) , Brazilian Center for Research in Energy and Materials (CNPEM) , Campinas , Sao Paulo 13083-970 , Brazil
| | - Sandra Martha Gomes Dias
- Brazilian Biosciences National Laboratory (LNBio) , Brazilian Center for Research in Energy and Materials (CNPEM) , Campinas , Sao Paulo 13083-970 , Brazil
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6
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Fazzari J, Linher-Melville K, Singh G. Tumour-Derived Glutamate: Linking Aberrant Cancer Cell Metabolism to Peripheral Sensory Pain Pathways. Curr Neuropharmacol 2018; 15:620-636. [PMID: 27157265 PMCID: PMC5543678 DOI: 10.2174/1570159x14666160509123042] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2016] [Revised: 03/16/2016] [Accepted: 04/17/2016] [Indexed: 01/22/2023] Open
Abstract
Background Chronic pain is a major symptom that develops in cancer patients, most commonly emerging during advanced stages of the disease. The nature of cancer-induced pain is complex, and the efficacy of current therapeutic interventions is restricted by the dose-limiting side-effects that accompany common centrally targeted analgesics. Methods This review focuses on how up-regulated glutamate production and export by the tumour converge at peripheral afferent nerve terminals to transmit nociceptive signals through the transient receptor cation channel, TRPV1, thereby initiating central sensitization in response to peripheral disease-mediated stimuli. Results Cancer cells undergo numerous metabolic changes that include increased glutamine catabolism and over-expression of enzymes involved in glutaminolysis, including glutaminase. This mitochondrial enzyme mediates glutaminolysis, producing large pools of intracellular glutamate. Up-regulation of the plasma membrane cystine/glutamate antiporter, system xc-, promotes aberrant glutamate release from cancer cells. Increased levels of extracellular glutamate have been associated with the progression of cancer-induced pain and we discuss how this can be mediated by activation of TRPV1. Conclusion With a growing population of patients receiving inadequate treatment for intractable pain, new targets need to be considered to better address this largely unmet clinical need for improving their quality of life. A better understanding of the mechanisms that underlie the unique qualities of cancer pain will help to identify novel targets that are able to limit the initiation of pain from a peripheral source–the tumour.
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Affiliation(s)
| | | | - Gurmit Singh
- Department of Pathology and Molecular Medicine; Michael G. DeGroote Institute for Pain Research and Care, McMaster University, Hamilton, ON. Canada
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7
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Banerjee A, Ray S. Novel insight into mutational impacts and binding mechanism of human glutaminase and glutaminase-interacting protein: A bio-molecular modeling and docking analysis. GENE REPORTS 2017. [DOI: 10.1016/j.genrep.2017.04.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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8
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Zhang C, Liu J, Zhao Y, Yue X, Zhu Y, Wang X, Wu H, Blanco F, Li S, Bhanot G, Haffty BG, Hu W, Feng Z. Glutaminase 2 is a novel negative regulator of small GTPase Rac1 and mediates p53 function in suppressing metastasis. eLife 2016; 5:e10727. [PMID: 26751560 PMCID: PMC4749555 DOI: 10.7554/elife.10727] [Citation(s) in RCA: 77] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Accepted: 12/06/2015] [Indexed: 01/13/2023] Open
Abstract
Glutaminase (GLS) isoenzymes GLS1 and GLS2 are key enzymes for glutamine metabolism. Interestingly, GLS1 and GLS2 display contrasting functions in tumorigenesis with elusive mechanism; GLS1 promotes tumorigenesis, whereas GLS2 exhibits a tumor-suppressive function. In this study, we found that GLS2 but not GLS1 binds to small GTPase Rac1 and inhibits its interaction with Rac1 activators guanine-nucleotide exchange factors, which in turn inhibits Rac1 to suppress cancer metastasis. This function of GLS2 is independent of GLS2 glutaminase activity. Furthermore, decreased GLS2 expression is associated with enhanced metastasis in human cancer. As a p53 target, GLS2 mediates p53's function in metastasis suppression through inhibiting Rac1. In summary, our results reveal that GLS2 is a novel negative regulator of Rac1, and uncover a novel function and mechanism whereby GLS2 suppresses metastasis. Our results also elucidate a novel mechanism that contributes to the contrasting functions of GLS1 and GLS2 in tumorigenesis.
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Affiliation(s)
- Cen Zhang
- Department of Radiation Oncology, Rutgers Cancer Institute of New Jersey, Rutgers, The State University of New Jersey, New Brunswick, United States
| | - Juan Liu
- Department of Radiation Oncology, Rutgers Cancer Institute of New Jersey, Rutgers, The State University of New Jersey, New Brunswick, United States
| | - Yuhan Zhao
- Department of Radiation Oncology, Rutgers Cancer Institute of New Jersey, Rutgers, The State University of New Jersey, New Brunswick, United States
| | - Xuetian Yue
- Department of Radiation Oncology, Rutgers Cancer Institute of New Jersey, Rutgers, The State University of New Jersey, New Brunswick, United States
| | - Yu Zhu
- Department of Radiation Oncology, Rutgers Cancer Institute of New Jersey, Rutgers, The State University of New Jersey, New Brunswick, United States.,Department of Neurosurgery, First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Xiaolong Wang
- Department of Radiation Oncology, Rutgers Cancer Institute of New Jersey, Rutgers, The State University of New Jersey, New Brunswick, United States
| | - Hao Wu
- Department of Radiation Oncology, Rutgers Cancer Institute of New Jersey, Rutgers, The State University of New Jersey, New Brunswick, United States
| | - Felix Blanco
- Department of Radiation Oncology, Rutgers Cancer Institute of New Jersey, Rutgers, The State University of New Jersey, New Brunswick, United States
| | - Shaohua Li
- Department of Surgery, Robert Wood Johnson Medical School, Rutgers, The State University of New Jersey, New Brunswick, United States
| | - Gyan Bhanot
- Department of Molecular Biology, Biochemistry & Physics, Rutgers, The State University of New Jersey, Piscataway, United States
| | - Bruce G Haffty
- Department of Radiation Oncology, Rutgers Cancer Institute of New Jersey, Rutgers, The State University of New Jersey, New Brunswick, United States
| | - Wenwei Hu
- Department of Radiation Oncology, Rutgers Cancer Institute of New Jersey, Rutgers, The State University of New Jersey, New Brunswick, United States
| | - Zhaohui Feng
- Department of Radiation Oncology, Rutgers Cancer Institute of New Jersey, Rutgers, The State University of New Jersey, New Brunswick, United States
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9
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Abstract
Mammalian glutaminases catalyze the stoichiometric conversion of L-glutamine to L-glutamate and ammonium ions. In brain, glutaminase is considered the prevailing pathway for synthesis of the neurotransmitter pool of glutamate. Besides neurotransmission, the products of glutaminase reaction also fulfill crucial roles in energy and metabolic homeostasis in mammalian brain. In the last years, new functional roles for brain glutaminases are being uncovered by using functional genomic and proteomic approaches. Glutaminases may act as multifunctional proteins able to perform different tasks: the discovery of multiple transcript variants in neurons and glial cells, novel extramitochondrial localizations, and isoform-specific proteininteracting partners strongly support possible moonlighting functions for these proteins. In this chapter, we present a critical account of essential works on brain glutaminase 80 years after its discovery. We will highlight the impact of recent findings and thoughts in the context of the glutamate/glutamine brain homeostasis.
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10
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Grosso M, Kalstein A, Parisi G, Roitberg AE, Fernandez-Alberti S. On the analysis and comparison of conformer-specific essential dynamics upon ligand binding to a protein. J Chem Phys 2015; 142:245101. [DOI: 10.1063/1.4922925] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Affiliation(s)
- Marcos Grosso
- Universidad Nacional de Quilmes, Roque Saenz Peña 352, B1876BXD Bernal, Argentina
| | - Adrian Kalstein
- Universidad Nacional de Quilmes, Roque Saenz Peña 352, B1876BXD Bernal, Argentina
| | - Gustavo Parisi
- Universidad Nacional de Quilmes, Roque Saenz Peña 352, B1876BXD Bernal, Argentina
| | - Adrian E. Roitberg
- Departments of Physics and Chemistry, University of Florida, Gainesville, Florida 32611, USA
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11
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Campos-Sandoval JA, Martín-Rufián M, Cardona C, Lobo C, Peñalver A, Márquez J. Glutaminases in brain: Multiple isoforms for many purposes. Neurochem Int 2015; 88:1-5. [PMID: 25837287 DOI: 10.1016/j.neuint.2015.03.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Revised: 03/12/2015] [Accepted: 03/16/2015] [Indexed: 10/23/2022]
Abstract
Glutaminase is expressed in most mammalian tissues and cancer cells, but recent studies are now revealing a considerably degree of complexity in its pattern of expression and functional regulation. Novel transcript variants of the mammalian glutaminase Gls2 gene have been recently found and characterized in brain. Co-expression of different isoforms in the same cell type would allow cells to fine-tune their Gln/Glu levels under a wide range of metabolic states. Moreover, the discovery of protein interacting partners and novel subcellular localizations, for example nucleocytoplasmic in neurons and astrocytes, strongly suggest non-neurotransmission roles for Gls2 isoforms associated with transcriptional regulation and cellular differentiation. Of note, Gls isoforms have been considered as an important trophic factor for neuronal differentiation and postnatal development of brain regions. On the other hand, glutaminases are taking center stage in tumor biology as new therapeutic targets to inhibit metabolic reprogramming of cancer cells. Interestingly, glutaminase isoenzymes play seemingly opposing roles in cancer cell growth and proliferation; this issue will be also succinctly discussed with special emphasis on brain tumors.
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Affiliation(s)
- José A Campos-Sandoval
- Departamento de Biología Molecular y Bioquímica, Canceromics Lab. Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain; Instituto de Investigación Biomédica de Málaga (IBIMA), Málaga, Spain
| | | | - Carolina Cardona
- Departamento de Biología Molecular y Bioquímica, Canceromics Lab. Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain; Instituto de Investigación Biomédica de Málaga (IBIMA), Málaga, Spain
| | - Carolina Lobo
- Proteomics Lab, Central Facility Core, Universidad de Málaga, 29071 Málaga, Spain
| | - Ana Peñalver
- Departamento de Biología Molecular y Bioquímica, Canceromics Lab. Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain; Instituto de Investigación Biomédica de Málaga (IBIMA), Málaga, Spain
| | - Javier Márquez
- Departamento de Biología Molecular y Bioquímica, Canceromics Lab. Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain; Instituto de Investigación Biomédica de Málaga (IBIMA), Málaga, Spain.
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12
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Reinstein E, Orvin K, Tayeb-Fligelman E, Stiebel-Kalish H, Tzur S, Pimienta AL, Bazak L, Bengal T, Cohen L, Gaton DD, Bormans C, Landau M, Kornowski R, Shohat M, Behar DM. Mutations inTAX1BP3Cause Dilated Cardiomyopathy with Septo-Optic Dysplasia. Hum Mutat 2015; 36:439-42. [DOI: 10.1002/humu.22759] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2014] [Accepted: 01/11/2015] [Indexed: 11/05/2022]
Affiliation(s)
- Eyal Reinstein
- The Raphael Recanati Genetic Institute; Rabin Medical Center; Israel
- Sackler School of Medicine; Tel Aviv University; Israel
| | - Katia Orvin
- Department of Cardiology; Rabin Medical Center; Israel
| | | | - Hadas Stiebel-Kalish
- Sackler School of Medicine; Tel Aviv University; Israel
- Department of Ophthalmology; Rabin Medical Center; Israel
| | - Shay Tzur
- Laboratory of Molecular Medicine; Rambam Health Care Campus; Haifa Israel
| | - Allen L. Pimienta
- Faculty of Medicine; Technion-Israel Institute of Technology; Haifa Israel
| | - Lily Bazak
- The Raphael Recanati Genetic Institute; Rabin Medical Center; Israel
| | - Tuvia Bengal
- Department of Cardiology; Rabin Medical Center; Israel
| | - Lior Cohen
- The Raphael Recanati Genetic Institute; Rabin Medical Center; Israel
| | - Dan D. Gaton
- Sackler School of Medicine; Tel Aviv University; Israel
- Department of Ophthalmology; Rabin Medical Center; Israel
| | | | - Meytal Landau
- Department of Biology; Technion-Israel Institute of Technology; Haifa Israel
| | - Ran Kornowski
- Department of Cardiology; Rabin Medical Center; Israel
| | - Mordechai Shohat
- The Raphael Recanati Genetic Institute; Rabin Medical Center; Israel
- Sackler School of Medicine; Tel Aviv University; Israel
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13
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Mohanty S, Ovee M, Banerjee M. PDZ Domain Recognition: Insight from Human Tax-Interacting Protein 1 (TIP-1) Interaction with Target Proteins. BIOLOGY 2015; 4:88-103. [PMID: 25665168 PMCID: PMC4381219 DOI: 10.3390/biology4010088] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Revised: 01/22/2015] [Accepted: 01/23/2015] [Indexed: 11/16/2022]
Abstract
Cellular signaling is primarily directed via protein-protein interactions. PDZ (PSD-95/Discs large/ZO-1 homologous) domains are well known protein-protein interaction modules involved in various key signaling pathways. Human Tax-interacting protein 1 (TIP-1), also known as glutaminase interaction protein (GIP), is a Class I PDZ domain protein that recognizes the consensus binding motif X-S/T-X-V/I/L-COOH of the C-terminus of its target proteins. We recently reported that TIP-1 not only interacts via the C-terminus of its target partner proteins but also recognizes an internal motif defined by the consensus sequence S/T-X-V/L-D in the target protein. Identification of new target partners containing either a C-terminal or internal recognition motif has rapidly expanded the TIP-1 protein interaction network. TIP-1 being composed solely of a single PDZ domain is unique among PDZ containing proteins. Since it is involved in many important signaling pathways, it is a possible target for drug design. In this mini review, we have discussed human TIP-1, its structure, mechanism of function, its interactions with target proteins containing different recognition motifs, and its involvement in human diseases. Understanding the molecular mechanisms of TIP-1 interactions with distinct target partners and their role in human diseases will be useful for designing novel therapeutics.
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Affiliation(s)
- Smita Mohanty
- Department of Chemistry, Oklahoma State University, Stillwater, OK 74078, USA.
| | - Mohiuddin Ovee
- Department of Chemistry, Oklahoma State University, Stillwater, OK 74078, USA.
| | - Monimoy Banerjee
- Department of Chemistry, Oklahoma State University, Stillwater, OK 74078, USA.
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Szeliga M, Albrecht J. Opposing roles of glutaminase isoforms in determining glioblastoma cell phenotype. Neurochem Int 2014; 88:6-9. [PMID: 25529918 DOI: 10.1016/j.neuint.2014.11.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2014] [Revised: 10/28/2014] [Accepted: 11/04/2014] [Indexed: 01/04/2023]
Abstract
Glutamine (Gln) and glutamate (Glu) play pivotal roles in the malignant phenotype of brain tumors via multiple mechanisms. Glutaminase (GA, EC 3.5.1.2) metabolizes Gln to Glu and ammonia. Human GA isoforms are encoded by two genes: GLS gene codes for kidney-type isoforms, KGA and GAC, whereas GLS2 codes for liver-type isoforms, GAB and LGA. The expression pattern of both genes in different neoplastic cell lines and tissues implicated that the kidney-type isoforms are associated with cell proliferation, while the liver-type isoforms dominate in, and contribute to the phenotype of quiescent cells. GLS gene has been demonstrated to be regulated by oncogene c-Myc, whereas GLS2 gene was identified as a target gene of p53 tumor suppressor. In glioblastomas (GBM, WHO grade IV), the most aggressive brain tumors, high levels of GLS and only traces or lack of GLS2 transcripts were found. Ectopic overexpression of GLS2 in human glioblastoma T98G cells decreased their proliferation and migration and sensitized them to the alkylating agents often used in the chemotherapy of gliomas. GLS silencing reduced proliferation of glioblastoma T98G cells and strengthen the antiproliferative effect evoked by previous GLS2 overexpression.
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Affiliation(s)
- Monika Szeliga
- Department of Neurotoxicology, Mossakowski Medical Research Centre, Polish Academy of Sciences, Warsaw, Poland.
| | - Jan Albrecht
- Department of Neurotoxicology, Mossakowski Medical Research Centre, Polish Academy of Sciences, Warsaw, Poland
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15
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Szeliga M, Bogacińska-Karaś M, Różycka A, Hilgier W, Marquez J, Albrecht J. Silencing of GLS and overexpression of GLS2 genes cooperate in decreasing the proliferation and viability of glioblastoma cells. Tumour Biol 2013; 35:1855-62. [PMID: 24096582 PMCID: PMC3967065 DOI: 10.1007/s13277-013-1247-4] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2013] [Accepted: 09/23/2013] [Indexed: 12/25/2022] Open
Abstract
Glutamine (Gln) metabolism, initiated by its degradation by glutaminases (GA), is elevated in neoplastic cells and tissues. In malignant glia-derived tumors, GA isoforms, KGA and GAC, coded by the GLS gene, are overexpressed, whereas the GLS2-coded GAB and LGA isoforms, are hardly detectable in there. Our previous study revealed that transfection of T98G glioblastoma cells with GAB reduced cell proliferation and migration, by a yet unknown mechanism not related to Gln degradation. The question arose how simultaneous overexpression of GAB and inhibition of KGA would affect glioblastoma cell growth. Here, we used siRNA to silence the expression of Gls in T98G cells which were or were not stably transfected with GAB (TGAB cells). In both T98G and TGAB cell lines, silencing of Gls with siRNAs targeted at different sequences decreased cell viability and proliferation in a different, sequence-dependent degree, and the observed decreases were in either cell line highly correlated with increase of intracellular Gln (r > 0.9), a parameter manifesting decreased Gln degradation. The results show that combination of negative modulation of GA isoforms arising from GLS gene with the introduction of the GLS2 gene product, GAB, may in the future provide a useful means to curb glioblastoma growth in situ. At the same time, the results underscore the critical role of Gln degradation mediated by KGA in the manifestations of aggressive glial tumor phenotype.
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Affiliation(s)
- Monika Szeliga
- Department of Neurotoxicology, Mossakowski Medical Research Centre Polish Academy of Sciences, 5 Pawińskiego Str., 02-106, Warsaw, Poland,
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16
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Márquez J, Cardona C, Campos-Sandoval JA, Peñalver A, Tosina M, Matés JM, Martín-Rufián M. Mammalian glutaminase isozymes in brain. Metab Brain Dis 2013; 28:133-7. [PMID: 23149879 DOI: 10.1007/s11011-012-9356-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/27/2012] [Accepted: 10/30/2012] [Indexed: 11/28/2022]
Abstract
Glutamine/glutamate homeostasis must be exquisitely regulated in mammalian brain and glutaminase (GA, E.C. 3.5.1.2) is one of the main enzymes involved. The products of GA reaction, glutamate and ammonia, are essential metabolites for energy and biosynthetic purposes but they are also hazardous compounds at concentrations beyond their normal physiological thresholds. The classical pattern of GA expression in mammals has been recently challenged by the discovery of novel transcript variants and protein isoforms. Furthermore, the interactome of brain GA is also starting to be uncovered adding a new level of regulatory complexity. GA may traffic in brain and unexpected locations, like cytosol and nucleus, have been found for GA isoforms. Finally, the expression of GA in glial cells has been reported and its potential implications in ammonia homeostasis are discussed.
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Affiliation(s)
- Javier Márquez
- Departamento de Biología Molecular y Bioquímica, Laboratorio de Química de Proteínas, Facultad de Ciencias, Universidad de Málaga, Málaga 29071, Spain.
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17
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Wang H, Han M, Whetsell W, Wang J, Rich J, Hallahan D, Han Z. Tax-interacting protein 1 coordinates the spatiotemporal activation of Rho GTPases and regulates the infiltrative growth of human glioblastoma. Oncogene 2013; 33:1558-69. [PMID: 23563176 PMCID: PMC3965267 DOI: 10.1038/onc.2013.97] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2012] [Revised: 01/17/2013] [Accepted: 02/04/2013] [Indexed: 12/28/2022]
Abstract
PDZ domains represent one group of the major structural units that mediate protein interactions in intercellular contact, signal transduction and assembly of biological machineries. TIP-1 protein is composed of a single PDZ domain that distinguishes TIP-1 from other PDZ domain proteins that more often contain multiple protein domains and function as scaffolds for protein complex assembly. However, the biological functions of TIP-1, especially in cell transformation and tumor progression, are still controversial as observed in a variety of cell types. In this study, we have identified ARHGEF7, a guanine nucleotide exchange factor (GEF) for Rho GTPases, as one novel TIP-1 interacting protein in human glioblastoma cells. We found that the presence of TIP-1 protein is essential to the intracellular redistribution of ARHGEF7 and rhotekin, one Rho effector, and the spatiotemporally coordinated activation of Rho GTPases (RhoA, Cdc42 and Rac1) in migrating glioblastoma cells. TIP-1 knockdown resulted in both aberrant localization of ARHGEF7 and rhotekin, as well as abnormal activation of Rho GTPases that was accompanied with impaired motility of glioblastoma cells. Furthermore, TIP-1 knockdown suppressed tumor cell dispersal in orthotopic glioblastoma murine models. We also observed high levels of TIP-1 expression in human glioblastoma specimens, and the elevated TIP-1 levels are associated with advanced staging and poor prognosis in glioma patients. Although more studies are needed to further dissect the mechanism(s) by which TIP-1 modulates the intracellular redistribution and activation of Rho GTPases, this study suggests that TIP-1 holds potential as both a prognostic biomarker and a therapeutic target of malignant gliomas.
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Affiliation(s)
- H Wang
- 1] Department of Radiation Oncology, Vanderbilt University School of Medicine, Nashville, TN, USA [2] Department of Cancer Biology, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - M Han
- 1] Department of Radiation Oncology, Vanderbilt University School of Medicine, Nashville, TN, USA [2] Key Laboratory of Animal Models and Human Disease Mechanisms, Kunming Institute of Zoology, Chinese Academy of Science, Kunming, China [3] Graduate School, Chinese Academy of Sciences, Beijing, China
| | - W Whetsell
- Department of Pathology, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - J Wang
- 1] Department of Neurological Surgery, Vanderbilt University School of Medicine, Nashville, TN, USA [2] Vanderbilt-Ingram Cancer Center, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - J Rich
- Department of Stem Cell Biology and Regenerative Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA
| | - D Hallahan
- Department of Radiation Oncology, Washington University School of Medicine, St Louis, MO, USA
| | - Z Han
- 1] Department of Radiation Oncology, Vanderbilt University School of Medicine, Nashville, TN, USA [2] Department of Cancer Biology, Vanderbilt University School of Medicine, Nashville, TN, USA [3] Vanderbilt-Ingram Cancer Center, Vanderbilt University School of Medicine, Nashville, TN, USA
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Zencir S, Banerjee M, Dobson MJ, Ayaydin F, Fodor EA, Topcu Z, Mohanty S. New partner proteins containing novel internal recognition motif for human glutaminase interacting protein (hGIP). Biochem Biophys Res Commun 2013; 432:10-5. [PMID: 23395680 DOI: 10.1016/j.bbrc.2013.01.098] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2013] [Accepted: 01/28/2013] [Indexed: 12/30/2022]
Abstract
Regulation of gene expression in cells is mediated by protein-protein, DNA-protein and receptor-ligand interactions. PDZ (PSD-95/Discs-large/ZO-1) domains are protein-protein interaction modules. PDZ-containing proteins function in the organization of multi-protein complexes controlling spatial and temporal fidelity of intracellular signaling pathways. In general, PDZ proteins possess multiple domains facilitating distinct interactions. The human glutaminase interacting protein (hGIP) is an unusual PDZ protein comprising entirely of a single PDZ domain and plays pivotal roles in many cellular processes through its interaction with the C-terminus of partner proteins. Here, we report the identification by yeast two-hybrid screening of two new hGIP-interacting partners, DTX1 and STAU1. Both proteins lack the typical C-terminal PDZ recognition motif but contain a novel internal hGIP recognition motif recently identified in a phage display library screen. Fluorescence resonance energy transfer and confocal microscopy analysis confirmed the in vivo association of hGIP with DTX1 and STAU1 in mammalian cells validating the previous discovery of S/T-X-V/L-D as a consensus internal motif for hGIP recognition. Similar to hGIP, DTX1 and STAU1 have been implicated in neuronal function. Identification of these new interacting partners furthers our understanding of GIP-regulated signaling cascades and these interactions may represent potential new drug targets in humans.
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Affiliation(s)
- Sevil Zencir
- Department of Medical Biology, Faculty of Medicine, Pamukkale University, Denizli 20070, Turkey
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19
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Han M, Wang H, Zhang HT, Han Z. Expression of Tax-interacting protein 1 (TIP-1) facilitates angiogenesis and tumor formation of human glioblastoma cells in nude mice. Cancer Lett 2012; 328:55-64. [PMID: 23010083 DOI: 10.1016/j.canlet.2012.09.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2012] [Revised: 08/28/2012] [Accepted: 09/14/2012] [Indexed: 11/18/2022]
Abstract
Glioblastoma is the most common and fatal type of primary brain tumors featured with hyperplastic blood vessels. Here, we performed meta-analyses of published data and established a correlation between high TIP-1 expression levels and the poor prognosis of glioblastoma patients. Next, we explored the biological relevance of TIP-1 expression in the pathogenesis of glioblastoma. By using orthotopic and heterotopic mouse models of human glioblastomas, this study has characterized TIP-1 as one contributing factor to the tumor-driven angiogenesis. In vitro and in vivo functional assays, along with biochemical analyses with microarrays and antibody arrays, have demonstrated that TIP-1 utilizes multiple pathways including modulating fibronectin gene expression and uPA protein secretion, to establish or maintain a pro-angiogenic microenvironment within human glioblastoma. In conclusion, this work supports one hypothesis that TIP-1 represents a novel prognostic biomarker and a therapeutic target of human glioblastoma.
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Affiliation(s)
- Miaojun Han
- Department of Radiation Oncology, School of Medicine, Vanderbilt University, Nashville, TN 37232, USA
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20
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Szeliga M, Zgrzywa A, Obara-Michlewska M, Albrecht J. Transfection of a human glioblastoma cell line with liver-type glutaminase (LGA) down-regulates the expression of DNA-repair gene MGMT and sensitizes the cells to alkylating agents. J Neurochem 2012; 123:428-36. [PMID: 22888977 DOI: 10.1111/j.1471-4159.2012.07917.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2012] [Revised: 07/30/2012] [Accepted: 08/05/2012] [Indexed: 12/21/2022]
Abstract
O(6)-methylguanine-DNA methyltransferase (MGMT) is a DNA-repair protein promoting resistance of tumor cells to alkylating chemotherapeutic agents. Glioma cells are particularly resistant to this class of drugs which include temozolomide (TMZ) and carmustine (BCNU). A previous study using the RNA microarray technique showed that decrease of MGMT mRNA stands out among the alterations in gene expression caused by the cell growth-depressing transfection of a T98G glioma cell line with liver-type glutaminase (LGA) [Szeliga et al. (2009) Glia, 57, 1014]. Here, we show that stably LGA-transfected cells (TLGA) exhibit decreased MGMT protein expression and activity as compared with non-transfected or mock transfected cells (controls). However, the decrease of expression occurs in the absence of changes in the methylation of the promoter region, indicating that LGA circumvents, by an as yet unknown route, the most common mechanism of MGMT silencing. TLGA turned out to be significantly more sensitive to treatment with 100-1000 μM of TMZ and BCNU in the acute cell growth inhibition assay (MTT). In the clonogenic survival assay, TLGA cells displayed increased sensitivity even to 10 μM TMZ and BCNU. Our results indicate that enrichment with LGA, in addition to inhibiting glioma growth, may facilitate chemotherapeutic intervention.
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Affiliation(s)
- Monika Szeliga
- Department of Neurotoxicology, Mossakowski Medical Research Centre, Polish Academy of Sciences, Warsaw, Poland.
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21
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Banerjee M, Zoetewey DL, Ovee M, Mazumder S, Petrenko VA, Samoylova TI, Mohanty S. Specificity and promiscuity in human glutaminase interacting protein recognition: insight from the binding of the internal and C-terminal motif. Biochemistry 2012; 51:6950-60. [PMID: 22876914 DOI: 10.1021/bi3008033] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A large number of cellular processes are mediated by protein-protein interactions, often specified by particular protein binding modules. PDZ domains make up an important class of protein-protein interaction modules that typically bind to the C-terminus of target proteins. These domains act as a scaffold where signaling molecules are linked to a multiprotein complex. Human glutaminase interacting protein (GIP), also known as tax interacting protein 1, is unique among PDZ domain-containing proteins because it is composed almost exclusively of a single PDZ domain rather than one of many domains as part of a larger protein. GIP plays pivotal roles in cellular signaling, protein scaffolding, and cancer pathways via its interaction with the C-terminus of a growing list of partner proteins. We have identified novel internal motifs that are recognized by GIP through combinatorial phage library screening. Leu and Asp residues in the consensus sequence were identified to be critical for binding to GIP through site-directed mutagenesis studies. Structure-based models of GIP bound to two different surrogate peptides determined from nuclear magnetic resonance constraints revealed that the binding pocket is flexible enough to accommodate either the smaller carboxylate (COO(-)) group of a C-terminal recognition motif or the bulkier aspartate side chain (CH(2)COO(-)) of an internal motif. The noncanonical ILGF loop in GIP moves in for the C-terminal motif but moves out for the internal recognition motifs, allowing binding to different partner proteins. One of the peptides colocalizes with GIP within human glioma cells, indicating that GIP might be a potential target for anticancer therapeutics.
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Affiliation(s)
- Monimoy Banerjee
- Department of Chemistry and Biochemistry, Auburn University, Auburn, AL 36849, USA
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22
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Han M, Wang H, Zhang HT, Han Z. The PDZ protein TIP-1 facilitates cell migration and pulmonary metastasis of human invasive breast cancer cells in athymic mice. Biochem Biophys Res Commun 2012; 422:139-45. [PMID: 22564736 DOI: 10.1016/j.bbrc.2012.04.123] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2012] [Accepted: 04/22/2012] [Indexed: 11/25/2022]
Abstract
Tax-interacting protein 1 (TIP-1, also known as Tax1bp3) inhibited proliferation of colon cancer cells through antagonizing the transcriptional activity of beta-catenin. However, in this study, elevated TIP-1 expression levels were detected in human invasive breast cancers. Studies with two human invasive breast cancer cell lines indicated that RNAi-mediated TIP-1 knockdown suppressed the cell adhesion, proliferation, migration and invasion in vitro, and inhibited tumor growth in mammary fat pads and pulmonary metastasis in athymic mice. Biochemical studies showed that TIP-1 knockdown had moderate and differential effects on the beta-catenin-regulated gene expression, but remarkably down regulated the genes for cell adhesion and motility in breast cancer cells. The decreased expression of integrins and paxillin was accompanied with reduced cell adhesion and focal adhesion formation on fibronectin-coated surface. In conclusion, this study revealed a novel oncogenic function of TIP-1 suggesting that TIP-1 holds potential as a prognostic biomarker and a therapeutic target in the treatment of human invasive breast cancers.
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Affiliation(s)
- Miaojun Han
- Key Laboratory of Animal Models and Human Disease Mechanisms of the Chinese Academy of Sciences & Yunnan Province, Kunming Institute of Zoology, Yunnan, China
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Zencir S, Ovee M, Dobson MJ, Banerjee M, Topcu Z, Mohanty S. Identification of brain-specific angiogenesis inhibitor 2 as an interaction partner of glutaminase interacting protein. Biochem Biophys Res Commun 2011; 411:792-7. [PMID: 21787750 DOI: 10.1016/j.bbrc.2011.07.029] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2011] [Accepted: 07/12/2011] [Indexed: 10/17/2022]
Abstract
The vast majority of physiological processes in living cells are mediated by protein-protein interactions often specified by particular protein sequence motifs. PDZ domains, composed of 80-100 amino acid residues, are an important class of interaction motif. Among the PDZ-containing proteins, glutaminase interacting protein (GIP), also known as Tax Interacting Protein TIP-1, is unique in being composed almost exclusively of a single PDZ domain. GIP has important roles in cellular signaling, protein scaffolding and modulation of tumor growth and interacts with a number of physiological partner proteins, including Glutaminase L, β-Catenin, FAS, HTLV-1 Tax, HPV16 E6, Rhotekin and Kir 2.3. To identify the network of proteins that interact with GIP, a human fetal brain cDNA library was screened using a yeast two-hybrid assay with GIP as bait. We identified brain-specific angiogenesis inhibitor 2 (BAI2), a member of the adhesion-G protein-coupled receptors (GPCRs), as a new partner of GIP. BAI2 is expressed primarily in neurons, further expanding GIP cellular functions. The interaction between GIP and the carboxy-terminus of BAI2 was characterized using fluorescence, circular dichroism (CD) and nuclear magnetic resonance (NMR) spectroscopy assays. These biophysical analyses support the interaction identified in the yeast two-hybrid assay. This is the first study reporting BAI2 as an interaction partner of GIP.
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Affiliation(s)
- Sevil Zencir
- Department of Biochemistry, Faculty of Science, Ege University, Izmir, Turkey
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Zoetewey DL, Ovee M, Banerjee M, Bhaskaran R, Mohanty S. Promiscuous binding at the crossroads of numerous cancer pathways: insight from the binding of glutaminase interacting protein with glutaminase L. Biochemistry 2011; 50:3528-39. [PMID: 21417405 DOI: 10.1021/bi102055y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The glutaminase interacting protein (GIP) is composed of a single PDZ domain that interacts with a growing list of partner proteins, including glutaminase L, that are involved in a number of cell signaling and cancer pathways. Therefore, GIP makes a good target for structure-based drug design. Here, we report the solution structures of both free GIP and GIP bound to the C-terminal peptide analogue of glutaminase L. This is the first reported nuclear magnetic resonance structure of GIP in a complex with one of its binding partners. Our analysis of both free GIP and GIP in a complex with the glutaminase L peptide provides important insights into how a promiscuous binding domain can have affinity for multiple binding partners. Through a detailed chemical shift perturbation analysis and backbone dynamics studies, we demonstrate here that the binding of the glutaminase L peptide to GIP is an allosteric event. Taken together, the insights reported here lay the groundwork for the future development of a specific inhibitor for GIP.
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Affiliation(s)
- David L Zoetewey
- Department of Chemistry and Biochemistry, Auburn University, Alabama 36849, United States
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Abstract
AbstractGlutaminase is considered as the main glutamate producer enzyme in brain. Consequently, the enzyme is essential for both glutamatergic and gabaergic transmissions. Glutamine-derived glutamate and ammonia, the products of glutaminase reaction, fulfill crucial roles in energy metabolism and in the biosynthesis of basic metabolites, such as GABA, proteins and glutathione. However, glutamate and ammonia are also hazardous compounds and danger lurks in their generation beyond normal physiological thresholds; hence, glutaminase activity must be carefully regulated in the mammalian brain. The differential distribution and regulation of glutaminase are key factors to modulate the metabolism of glutamate and glutamine in brain. The discovery of novel isoenzymes, protein interacting partners and subcellular localizations indicate new functions for brain glutaminase. In this short review, we summarize recent findings that point consistently towards glutaminase as a multifaceted protein able to perform different tasks. Finally, we will highlight the involvement of glutaminase in pathological states and its consideration as a potential therapeutic target.
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Durney MA, Birrane G, Anklin C, Soni A, Ladias JAA. Solution structure of the human Tax-interacting protein-1. JOURNAL OF BIOMOLECULAR NMR 2009; 45:329-334. [PMID: 19685007 DOI: 10.1007/s10858-009-9361-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2009] [Accepted: 07/23/2009] [Indexed: 05/28/2023]
Affiliation(s)
- Michael A Durney
- Molecular Medicine Laboratory and Macromolecular Crystallography Unit, Department of Medicine, Harvard Medical School, Boston, MA, 02215, USA
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28
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Yan X, Zhou H, Zhang J, Shi C, Xie X, Wu Y, Tian C, Shen Y, Long J. Molecular mechanism of inward rectifier potassium channel 2.3 regulation by tax-interacting protein-1. J Mol Biol 2009; 392:967-76. [PMID: 19635485 DOI: 10.1016/j.jmb.2009.07.060] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2009] [Revised: 06/10/2009] [Accepted: 07/21/2009] [Indexed: 01/02/2023]
Abstract
Inwardly rectifying potassium channel 2.3 (Kir2.3) is specifically targeted on the basolateral membranes of epithelial and neuronal cells, and it thus plays an important role in maintaining potassium homeostasis. Tax-interacting protein-1 (TIP-1), an atypical PDZ-domain-containing protein, binds to Kir2.3 with a high affinity, causing the intracellular accumulation of Kir2.3 in cultured epithelial cells. However, the molecular basis of the TIP-1/Kir2.3 interaction is still poorly understood. Here, we present the crystal structure of TIP-1 in complex with the C-terminal Kir2.3-peptide (residues 436-445) to reveal the molecular details of the interaction between them. Moreover, isothermal titration calorimetry experiments show that the C-terminal Kir2.3-peptide binds much more strongly to TIP-1 than to mammalian Lin-7, indicating that TIP-1 can compete with mammalian Lin-7 to uncouple Kir2.3 from its basolateral membrane anchoring complex. We further show that the phosphorylation/dephosphorylation of Ser443 within the C-terminal Kir2.3 PDZ-binding motif RRESAI dynamically regulates the Kir2.3/TIP-1 association in heterologous HEK293T cells. These data suggest that TIP-1 may act as an important regulator for the endocytic pathway of Kir2.3.
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Affiliation(s)
- Xiaojie Yan
- Tianjin Key Laboratory of Protein Science, College of Life Science, Nankai University, Tianjin 300071, China
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Szeliga M, Obara-Michlewska M, Matyja E, Łazarczyk M, Lobo C, Hilgier W, Alonso FJ, Márquez J, Albrecht J. Transfection with liver-type glutaminase cDNA alters gene expression and reduces survival, migration and proliferation of T98G glioma cells. Glia 2009; 57:1014-23. [PMID: 19062176 DOI: 10.1002/glia.20825] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Liver-type glutaminase (LGA) is a glutaminase isoform that has been implicated in transcription modulation. LGA mRNA is absent from postoperative samples of primary gliomas and is low in cultured astrocytes. In this study, stable transfection of T98G cells with a vector carrying human LGA sequence increased the expression of LGA mRNA and protein, and the ability of the cells to degrade glutamine (Gln), as manifested by a three-fold reduction of their steady-state Gln content and a 2.5-fold increase of their glutamate (Glu) content. The transfected cells (TLGA cells) showed a 40% decrease of cell survival as assessed by colony formation, well correlated with significant reduction of mitochondrial activity as demonstrated with MTT test. Also, a 45% reduction of cell migration and a 47% decrease of proliferation index (Ki67 immunostaining) were found as compared with sham-transfected cells. Microarray analysis, which included over 47,000 transcripts, revealed a significantly altered expression of 85 genes in TLGA, but not in sham-transfected or control cells (P < 0.005). Microarray data were confirmed with real-time PCR analysis for eight genes potentially relevant to malignancy: S100A16, CAPN2, FNDC3B, DYNC1LI1, TIMP4, MGMT, ADM, and TIMP1. Of these changes, decreased expression of S100A16 and MGMT can be best reconciled with the current views on the role of their protein products in glioma malignancy. Malignancy-reducing effect of newly inserted LGA mRNA in glioblastoma cells can be reconciled with a hypothesis that absence of such a modulatory mechanism in glia-derived tumors deprived of LGA mRNA may facilitate some aspects of their progression.
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Affiliation(s)
- Monika Szeliga
- Department of Neurotoxicology, Mossakowski Medical Research Centre, Polish Academy of Sciences, Warsaw, Poland.
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New insights into brain glutaminases: beyond their role on glutamatergic transmission. Neurochem Int 2009; 55:64-70. [PMID: 19428808 DOI: 10.1016/j.neuint.2009.02.022] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2008] [Revised: 02/18/2009] [Accepted: 02/27/2009] [Indexed: 01/29/2023]
Abstract
The synthesis of glutamate in brain must be exquisitely regulated because of its harmful potential giving rise to excitotoxic damage. In this sense, a stringent control based on multiple regulatory mechanisms should be expected to be exhibited by the biosynthetic enzymes responsible of glutamate generation, to assure that glutamate is only synthesized at the right place and at the right time. Glutaminase is considered as the main glutamate-producer enzyme in brain. Recently, novel glutaminase isoforms and extramitochondrial locations for these proteins have been discovered in the brain of mammals: identifying the function of each isozyme is essential for understanding the role of glutaminases in cerebral function. In addition, the interactome of glutaminases is starting to be uncovered adding a new level of regulatory complexity with important functional consequences, including selective and regulated targeting to concrete cellular locations. Finally, recent progress has identified glutaminase to be also present in astrocytes which precludes its classical consideration as a neuron-specific enzyme.
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31
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de la Rosa V, Campos-Sandoval JA, Martín-Rufián M, Cardona C, Matés JM, Segura JA, Alonso FJ, Márquez J. A novel glutaminase isoform in mammalian tissues. Neurochem Int 2009; 55:76-84. [PMID: 19428810 DOI: 10.1016/j.neuint.2009.02.021] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2008] [Revised: 02/24/2009] [Accepted: 02/27/2009] [Indexed: 12/18/2022]
Abstract
The synthesis of neurotransmitter glutamate in brain is mainly carried out by glutaminase enzymes. This synthesis must be exquisitely regulated because of its harmful potential giving rise to excitotoxic damage. It is noteworthy that two glutaminase isozymes coded by different genes are expressed in the brain of mammals. The need for two genes and two isozymes to support the single process of glutamate synthesis is unexplained, and identifying the role of each glutaminase is an important factor in understanding glutamate-mediated neurotransmission. Multiple transcripts for glutaminase genes and simultaneous expression of glutaminase isoforms have been reported in mammalian tissues and cells. The recent discovery of protein interacting partners widens the possibilities of regulatory mechanisms controlling these biosynthetic enzymes. The expression of distinct isozymes and binding partners may represent the biochemical and molecular basis to achieve fine-tuning control of glutamate synthesis in different cell types or developmental states. In this review, we will briefly summarize recent works on glutaminase proteins in mammals, with particular emphasis on brain studies. We present convergent evidence supporting the existence of a novel glutaminase isozyme in mammalian tissues.
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Affiliation(s)
- Vanessa de la Rosa
- Departamento de Biología Molecular y Bioquímica, Facultad de Ciencias, Laboratorio de Química de Proteínas, Universidad de Málaga, Málaga, Spain
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32
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Glutamine in neoplastic cells: focus on the expression and roles of glutaminases. Neurochem Int 2009; 55:71-5. [PMID: 19428809 DOI: 10.1016/j.neuint.2009.01.008] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2008] [Revised: 01/09/2009] [Accepted: 01/14/2009] [Indexed: 01/21/2023]
Abstract
Glutamine is an important source of energy for neoplastic tissues, and products of its metabolism include, among others, glutamate (Glu) and glutathione (GSH), the two molecules that play a key role in tumor proliferation, invasiveness and resistance to therapy. Glutamine hydrolysis in normal and transforming mammalian tissues alike, is carried out by different isoforms of glutaminases, of which the two major are liver-type glutaminase (LGA) and kidney-type glutaminase (KGA). This brief review summarizes available data on the expression profiles and activities of these isoenzymes in different neoplastic tissues as compared to the tissues of origin, and dwells on recent work demonstrating effects of manipulation of glutaminase expression on tumor growth. A comment is devoted to the emerging evidence that LGA, apart from degrading Gln for metabolic purposes, is involved in gene transcription; its enforced overexpression in glioma cells was found to reduce their proliferation and migration.
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33
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Iyer PV, Singhal RS. Screening and selection of marine isolate for L-glutaminase production and media optimization using response surface methodology. Appl Biochem Biotechnol 2009; 159:233-50. [PMID: 19184546 DOI: 10.1007/s12010-008-8522-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2008] [Accepted: 12/29/2008] [Indexed: 10/21/2022]
Abstract
The current work details the screening of about 400 marine isolates from various marine niches, from which one isolate was finally selected based on the productivity of glutaminase (71.23 U/l). Further, biochemical identification tests and 16S rRNA sequencing identified this isolate to be Providencia sp. This isolate was taken up for further media optimization studies by using one-factor-at-a-time approach and subsequently by response surface methodology. A face centered central composite design was employed to investigate the interactive effects of four variables, viz., concentrations of glucose, methionine, urea, and succinic acid on glutaminase production. A significant influence of urea on glutaminase production was noted. Response surface methodology showed that a medium containing (g/l) glucose 10.0, urea 5.15, methionine 3.5, succinic acid 6.0, ammonium sulfate 2.5, and yeast extract 6.0 to be optimum for the production of glutaminase. The applied methodology was validated using this optimized media and enzyme activity 119 +/- 0.12 U/l and specific activity of 0.63 U/mg protein after 28 h of incubation at 25 degrees C was obtained.
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Affiliation(s)
- Padma V Iyer
- Food Engineering and Technology Department, Institute of Chemical Technology, Nathalal Parikh Marg, Mumbai, India.
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Waite A, Tinsley CL, Locke M, Blake DJ. The neurobiology of the dystrophin-associated glycoprotein complex. Ann Med 2009; 41:344-59. [PMID: 19172427 DOI: 10.1080/07853890802668522] [Citation(s) in RCA: 86] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
While the function of dystrophin in muscle disease has been thoroughly investigated, dystrophin and associated proteins also have important roles in the central nervous system. Many patients with Duchenne and Becker muscular dystrophies (D/BMD) have cognitive impairment, learning disability, and an increased incidence of some neuropsychiatric disorders. Accordingly, dystrophin and members of the dystrophin-associated glycoprotein complex (DGC) are found in the brain where they participate in macromolecular assemblies that anchor receptors to specialized sites within the membrane. In neurons, dystrophin and the DGC participate in the postsynaptic clustering and stabilization of some inhibitory GABAergic synapses. During development, alpha-dystroglycan functions as an extracellular matrix receptor controlling, amongst other things, neuronal migration in the developing cortex and cerebellum. Several types of congenital muscular dystrophy caused by impaired alpha-dystroglycan glycosylation cause neuronal migration abnormalities and mental retardation. In glial cells, the DGC is involved in the organization of protein complexes that target water-channels to the plasma membrane. Finally, mutations in the gene encoding epsilon-sarcoglycan cause the neurogenic movement disorder, myoclonus-dystonia syndrome implicating epsilon-sarcoglycan in dopaminergic neurotransmission. In this review we describe the recent progress in defining the role of the DGC and associated proteins in the brain.
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Affiliation(s)
- Adrian Waite
- Department of Psychological Medicine, Cardiff University, Heath Park, Cardiff, UK
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35
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Olalla L, Gutiérrez A, Jiménez AJ, López-Téllez JF, Khan ZU, Pérez J, Alonso FJ, de la Rosa V, Campos-Sandoval JA, Segura JA, Aledo JC, Márquez J. Expression of the scaffolding PDZ protein glutaminase-interacting protein in mammalian brain. J Neurosci Res 2008; 86:281-92. [PMID: 17847083 DOI: 10.1002/jnr.21505] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A human brain cDNA clone coding for a novel PDZ-domain protein of 124 amino acids was previously isolated in our laboratory. The protein was termed glutaminase-interacting protein (GIP), because it interacts with the C-terminal region of the human L-type glutaminase (LGA). The pattern of expression and functions of GIP in brain are completely unknown, so its significance remains undefined. Here we describe the expression of GIP mRNA and protein in mammalian brain. Northern blot analysis revealed that GIP mRNA was ubiquitous in most regions of human brain but was particularly abundant in spinal cord. The presence of the protein in rat and monkey brain was studied at the regional, cellular, and subcellular level by immunocytochemistry. The protein was found to be present in both neurons and astrocytes, with a cytosolic and mitochondrial subcellular localization. Double immunofluorescence labeling with anti-GIP and anti-LGA antibodies using confocal microscopy revealed colocalization of both proteins in astrocyte cell processes and their perivascular end feet. Electron microscopy of rat brain neurons revealed GIP immunoreactivity concentrated also in the nuclear envelope and the plasma membrane. The multiple locations for GIP in mammalian brain are in agreement with known protein interaction partners reported for this PDZ protein. The findings presented here support a role of GIP as an important scaffold in both astrocytes and neurons and point toward astrocytic processes and perivascular end feet as plausible anatomical substrates for interaction with glutaminase.
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Affiliation(s)
- Lucía Olalla
- Departamento de Biología Molecular y Bioquímica, Universidad de Málaga, Málaga, Spain
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36
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Campos-Sandoval JA, López de la Oliva AR, Lobo C, Segura JA, Matés JM, Alonso FJ, Márquez J. Expression of functional human glutaminase in baculovirus system: Affinity purification, kinetic and molecular characterization. Int J Biochem Cell Biol 2007; 39:765-73. [PMID: 17267261 DOI: 10.1016/j.biocel.2006.12.002] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2006] [Revised: 12/05/2006] [Accepted: 12/06/2006] [Indexed: 11/29/2022]
Abstract
Glutaminase catalyzes the hydrolysis of glutamine yielding stoichiometric amounts of glutamate plus ammonium ions. In mammals, there are two different genes encoding for glutaminase, known as liver (L) and kidney (K) types. The human L-type isoform expressed in baculovirus yielded functional recombinant enzyme in Sf9 insect cells. A novel affinity chromatography method, based on its specific interaction with a PDZ protein, was developed for purification. Kinetic constants were determined for the purified human isozyme, which showed an allosteric behaviour for glutamine, with a Hill index of 2.7 and S(0.5) values of 32 and 64 mM for high and low P(i) concentrations, respectively. Whereas the protein showed a low P(i) dependence typical for L-type glutaminases, the enzyme was unexpectedly inhibited by glutamate, a kinetic characteristic exclusive of K-type isozymes, and was slightly activated by ammonia, unlike the classical liver enzymes which show an absolute dependence on ammonia. Subcellular fractionation demonstrates that recombinant human glutaminase was targeted to both mitochondria and nucleus, and in both locations the protein was catalytically active. This is the first report of the expression of a functional L-type mammalian glutaminase enzyme. The study also provides a simple and efficient method for affinity purification of the recombinant enzyme. Moreover, the data imply that this human enzyme may represent a new isoform different from classical kidney and liver isozymes.
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Affiliation(s)
- José A Campos-Sandoval
- Departamento de Biología Molecular y Bioquímica, Laboratorio de Química de Proteínas, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain
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37
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Erdmann NB, Whitney NP, Zheng J. Potentiation of Excitotoxicity in HIV-1 Associated Dementia and the Significance of Glutaminase. ACTA ACUST UNITED AC 2006; 6:315-328. [PMID: 18059978 DOI: 10.1016/j.cnr.2006.09.009] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
HIV-1 Associated Dementia (HAD) is a significant consequence of HIV infection. Although multiple inflammatory factors contribute to this chronic, progressive dementia, excitotoxic damage appears to be an underlying mechanism in the neurodegenerative process. Excitotoxicity is a cumulative effect of multiple processes occurring in the CNS during HAD. The overstimulation of glutamate receptors, an increased vulnerability of neurons, and disrupted astrocyte support each potentiate excitotoxic damage to neurons. Recent evidence suggests that poorly controlled generation of glutamate by phosphate-activated glutaminase may contribute to the neurotoxic state typical of HAD as well as other neurodegenerative disorders. Glutaminase converts glutamine, a widely available substrate throughout the CNS to glutamate. Inflammatory conditions may precipitate unregulated activity of glutaminase, a potentially important mechanism in HAD pathogenesis.
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Affiliation(s)
- Nathan B Erdmann
- The laboratory of Neurotoxicology, University of Nebraska Medical Center, Omaha, Nebraska 68198-5880
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38
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Alewine C, Olsen O, Wade JB, Welling PA. TIP-1 has PDZ scaffold antagonist activity. Mol Biol Cell 2006; 17:4200-11. [PMID: 16855024 PMCID: PMC1635354 DOI: 10.1091/mbc.e06-02-0129] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2006] [Revised: 06/20/2006] [Accepted: 07/06/2006] [Indexed: 11/11/2022] Open
Abstract
PDZ proteins usually contain multiple protein-protein interaction domains and act as molecular scaffolds that are important for the generation and maintenance of cell polarity and cell signaling. Here, we identify and characterize TIP-1 as an atypical PDZ protein that is composed almost entirely of a single PDZ domain and functions as a negative regulator of PDZ-based scaffolding. We found that TIP-1 competes with the basolateral membrane mLin-7/CASK complex for interaction with the potassium channel Kir 2.3 in model renal epithelia. Consequently, polarized plasma membrane expression of Kir 2.3 is disrupted resulting in pronounced endosomal targeting of the channel, similar to the phenotype observed for mutant Kir 2.3 channels lacking the PDZ-binding motif. TIP-1 is ubiquitously expressed, raising the possibility that TIP-1 may play a similar role in regulating the expression of other membrane proteins containing a type I PDZ ligand.
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Affiliation(s)
- Christine Alewine
- Department of Physiology, University of Maryland, School of Medicine, Baltimore, MD 21201
| | - Olav Olsen
- Department of Physiology, University of Maryland, School of Medicine, Baltimore, MD 21201
| | - James B. Wade
- Department of Physiology, University of Maryland, School of Medicine, Baltimore, MD 21201
| | - Paul A. Welling
- Department of Physiology, University of Maryland, School of Medicine, Baltimore, MD 21201
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39
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Feoli AM, Siqueira I, Almeida LMV, Tramontina AC, Battu C, Wofchuk ST, Gottfried C, Perry ML, Gonçalves CA. Brain glutathione content and glutamate uptake are reduced in rats exposed to pre- and postnatal protein malnutrition. J Nutr 2006; 136:2357-61. [PMID: 16920854 DOI: 10.1093/jn/136.9.2357] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
The brain is particularly susceptible to oxidative insults and its antioxidant defense is dependent on its glutathione content. Protein malnutrition (PMN) is an important and very common insult during development and compromises antioxidant defenses in the body, particularly glutathione levels. We investigated whether brain glutathione content and related metabolic pathways, predominantly regulated by astrocytes (particularly glutamate uptake and glutamine synthesis), are altered by pre- and postnatal PMN in rats. Thus, we measured the glutathione content, glutamine synthetase (GS) activity, and glutamate uptake activity in the cerebral cortex (Cx) and hippocampus of rats subjected to pre- and postnatal PMN and in nourished controls. Although malnourished rats exhibited an ontogenetic profile of glutathione levels in both brain regions similar to that of controls, they had lower levels on postnatal d 2 (P2); in Cx this decrease persisted until postnatal d 15. In addition, we found other changes, such as reduced total antioxidant reactivity and glutathione peroxidase activity on P2, and these were not accompanied by alterations in free radical levels or lipoperoxidation in either brain region. Moreover, malnourished rats had elevated GS and reduced glutamate uptake. Taken together, these alterations indicate specific changes in astrocyte metabolism, possibly responsible for the higher vulnerability to excitotoxic/oxidative damage in malnourished rats. The lower antioxidant defense appears to be the main alteration that causes oxidative imbalance, rather than an increase in reactive oxygen species. Moreover, a recovery of altered metabolic variables may occur during adulthood, despite persistent PMN.
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Affiliation(s)
- Ana Maria Feoli
- Departamento de Bioquímica, ICBS, Universidade Federal do Rio Grande de do Sul, Porto Alegre, Brazil
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40
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Márquez J, de la Oliva ARL, Matés JM, Segura JA, Alonso FJ. Glutaminase: A multifaceted protein not only involved in generating glutamate. Neurochem Int 2006; 48:465-71. [PMID: 16516349 DOI: 10.1016/j.neuint.2005.10.015] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2005] [Revised: 10/27/2005] [Accepted: 10/27/2005] [Indexed: 11/30/2022]
Abstract
The protein glutaminase has been traditionally considered as a mitochondrial enzyme, playing a key role in the energy and nitrogen metabolism of mammalian cells. However, new experimental evidence in the last few years has challenged this simplified view. The recent discovery of novel extramitochondrial localizations, the identification of potential protein interacting partners, the existence of multiple transcripts for mammalian glutaminase genes, and the presence of signature sequences and protein motifs on its sequence support the notion of glutaminase being a multifaceted protein, which may be involved in other functions besides glutamate generation from glutamine. In this short review, we will briefly summarize recent works on glutaminase proteins in mammals, with particular emphasis in brain studies. This experimental evidence will then be used to highlight new potential roles for this classical metabolic enzyme.
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Affiliation(s)
- Javier Márquez
- Laboratorio de Química de Proteínas, Departamento de Biología Molecular y Bioquímica, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain.
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41
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Pérez-Gómez C, Campos-Sandoval J, Alonso F, Segura J, Manzanares E, Ruiz-Sánchez P, González M, Márquez J, Matés J. Co-expression of glutaminase K and L isoenzymes in human tumour cells. Biochem J 2005; 386:535-42. [PMID: 15496140 PMCID: PMC1134872 DOI: 10.1042/bj20040996] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The pattern of expression of glutaminase isoenzymes in tumour cells has been investigated to clarify its role in the malignant transformation and the prospect of its use as a clinically relevant factor. Using leukaemia cells from medullar blood of human patients and several established human cancer cell lines, we have developed a competitive RT (reverse transcriptase)-PCR assay to quantify simultaneously K-type (kidney-type) and L-type (liver-type) glutaminase mRNAs. Co-expression of both transcripts and higher amounts of L-type mRNA were always found in all cancer cell types analysed. However, mature lymphocytes from the medullar blood of a patient suffering aplasia did not express the K-type transcript and showed a 15-fold increase of L-type transcript. Co-expression was also confirmed at the protein level using isoform-specific antibodies; nevertheless, it did not correlate with the relative abundance of glutaminase transcripts and strong K-type protein signals were detected. On the other hand, marked differences were found with regard to glutamate inhibition and phosphate activation of tumour glutaminase activity. Taken together, the protein data suggest that K isoform would account for the majority of glutaminase activity in these human tumour cells. The results confirm that simultaneous expression of both isoenzymes in human cancer cells is a more frequent event than previously thought. Furthermore, the present work and other previous data suggest that K isoform is up-regulated with increased rates of proliferation, whereas prevalence of the L isoform seems to be related with resting or quiescent cell states.
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Affiliation(s)
- Cristina Pérez-Gómez
- *Departamento de Biología Molecular y Bioquímica, Laboratorio de Química de Proteínas, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain
| | - José A. Campos-Sandoval
- †Department of Biochemistry, Medical College of Virginia, 1217 E. Marshall Street, Richmond, VA 23298-0565, U.S.A
| | - Francisco J. Alonso
- *Departamento de Biología Molecular y Bioquímica, Laboratorio de Química de Proteínas, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain
| | - Juan A. Segura
- *Departamento de Biología Molecular y Bioquímica, Laboratorio de Química de Proteínas, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain
| | - Elisa Manzanares
- *Departamento de Biología Molecular y Bioquímica, Laboratorio de Química de Proteínas, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain
| | - Pedro Ruiz-Sánchez
- ‡Servicio de Hematología, Hospital Materno Infantil, 29009 Málaga, Spain
| | - María E. González
- ‡Servicio de Hematología, Hospital Materno Infantil, 29009 Málaga, Spain
| | - Javier Márquez
- *Departamento de Biología Molecular y Bioquímica, Laboratorio de Química de Proteínas, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain
- To whom correspondence should be addressed (email or )
| | - José M. Matés
- *Departamento de Biología Molecular y Bioquímica, Laboratorio de Química de Proteínas, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain
- To whom correspondence should be addressed (email or )
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Wiedemann U, Boisguerin P, Leben R, Leitner D, Krause G, Moelling K, Volkmer-Engert R, Oschkinat H. Quantification of PDZ Domain Specificity, Prediction of Ligand Affinity and Rational Design of Super-binding Peptides. J Mol Biol 2004; 343:703-18. [PMID: 15465056 DOI: 10.1016/j.jmb.2004.08.064] [Citation(s) in RCA: 119] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2004] [Revised: 08/13/2004] [Accepted: 08/18/2004] [Indexed: 11/30/2022]
Abstract
Transient macromolecular complexes are often formed by protein-protein interaction domains (e.g. PDZ, SH2, SH3, WW) which recognize linear sequence motifs with in vitro affinities typically in the micromolar range. The analysis of the resulting interaction networks requires a quantification of domain specificity and selectivity towards all possible ligands with physiologically relevant affinity. As representative examples, we determined specificity as a function of ligand sequence-dependent affinity contributions by statistical analysis of peptide library screens for the AF6, ERBIN and SNA1 (alpha-1-syntrophin) PDZ domains. For this purpose, the three PDZ domains were first screened for binding with a peptide library comprising 6223 human C termini created by SPOT synthesis. Based on the detected ligand preferences, we designed focused peptide libraries (profile libraries). These libraries were used to quantify the affinity contributions of the four C-terminal ligand residues by means of ANOVA models (analysis of variance) relating the C-terminal ligand sequences to the corresponding dissociation constants. Our models agreed well with experimentally determined dissociation constants and allowed us to design super binding peptides. The latter were shown experimentally to bind to their cognate PDZ domains with the highest affinity. In addition, we determined structure-activity relationships and thereby rationalized the position-specific affinity contributions. Furthermore, we used the statistical models to predict the dissociation constants for the complete ligand sequence space and thus determined the specificity overlap for the three investigated PDZ domains (). Altogether, we present an efficient method for profiling protein-protein interaction domains that provides a biophysical picture of specificity and selectivity. This approach allows the rational design of functional experiments and provides a basis for simulating interaction networks in the field of systems biology.
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Affiliation(s)
- Urs Wiedemann
- Forschungsinstitut für Molekulare Pharmakologie, Robert-Rössle-Str. 10, 13125 Berlin, Germany
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43
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Taylor L, Curthoys NP. Glutamine metabolism: Role in acid-base balance*. BIOCHEMISTRY AND MOLECULAR BIOLOGY EDUCATION : A BIMONTHLY PUBLICATION OF THE INTERNATIONAL UNION OF BIOCHEMISTRY AND MOLECULAR BIOLOGY 2004; 32:291-304. [PMID: 21706743 DOI: 10.1002/bmb.2004.494032050388] [Citation(s) in RCA: 86] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The intent of this review is to provide a broad overview of the interorgan metabolism of glutamine and to discuss in more detail its role in acid-base balance. Muscle, adipose tissue, and the lungs are the primary sites of glutamine synthesis and release. During normal acid-base balance, the small intestine and the liver are the major sites of glutamine utilization. The periportal hepatocytes catabolize glutamine and convert ammonium and bicarbonate ions to urea. In contrast, the perivenous hepatocytes are capable of synthesizing glutamine. During metabolic acidosis, the kidney becomes the major site of glutamine extraction and catabolism. This process generates ammonium ions that are excreted in the urine to facilitate the excretion of acids and bicarbonate ions that are transported to the blood to partially compensate the acidosis. The increased renal extraction of glutamine is balanced by an increased release from muscle and liver and by a decreased utilization in the intestine. During chronic acidosis, this adaptation is sustained, in part, by increased renal expression of genes that encode various transport proteins and key enzymes of glutamine metabolism. The increased levels of phosphoenolpyruvate carboxykinase result from increased transcription, while the increase in glutaminase and glutamate dehydrogenase activities result from stabilization of their respective mRNAs. Where feasible, this review draws upon data obtained from studies in humans. Studies conducted in model animals are discussed where available data from humans is either lacking or not firmly established. Because there are quantitative differences in tissue utilization and synthesis of glutamine in different mammals, the review will focus more on common principles than on quantification.
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Affiliation(s)
- Lynn Taylor
- Department of Biochemistry and Molecular Biology Colorado State University, Fort Collins, CO 80523-1870
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44
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Boisguerin P, Leben R, Ay B, Radziwill G, Moelling K, Dong L, Volkmer-Engert R. An Improved Method for the Synthesis of Cellulose Membrane-Bound Peptides with Free C Termini Is Useful for PDZ Domain Binding Studies. ACTA ACUST UNITED AC 2004; 11:449-59. [PMID: 15123239 DOI: 10.1016/j.chembiol.2004.03.010] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2003] [Revised: 12/18/2003] [Accepted: 01/07/2004] [Indexed: 10/26/2022]
Abstract
SPOT synthesis permits parallel synthesis and screening of thousands of cellulose membrane-bound peptides to study protein-protein interactions in a proteomic context. Recognition of C-terminal residues is one of the most common binding features of PDZ domains. Unfortunately, most solid support-bound peptide libraries lack a free C terminus due to C-terminal fixation on the solid support. To overcome this restriction, we developed a robust methodology based on our previous strategy for generating peptides with authentic C termini. To validate this improved method, we screened a human peptide library of 6223 C termini with the syntrophin PDZ domain. Furthermore, using the same library, new peptide ligands derived from membrane proteins and receptors were found for the ERBIN PDZ domain. Finally, we identified the protein kinase breakpoint cluster region, which is known as a negative regulator of cell proliferation and oncogenic transformation, as an ERBIN ligand.
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Affiliation(s)
- Prisca Boisguerin
- Institut für Medizinische Immunologie, Charité-Universitätsmedizin Berlin, Hessische Strasse 3-4, 10115 Berlin, Germany
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Kanamori M, Sandy P, Marzinotto S, Benetti R, Kai C, Hayashizaki Y, Schneider C, Suzuki H. The PDZ protein tax-interacting protein-1 inhibits beta-catenin transcriptional activity and growth of colorectal cancer cells. J Biol Chem 2003; 278:38758-64. [PMID: 12874278 DOI: 10.1074/jbc.m306324200] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Wnt signaling is essential during development while deregulation of this pathway frequently leads to the formation of various tumors including colorectal carcinomas. A key component of the pathway is beta-catenin that, in association with TCF-4, directly regulates the expression of Wnt-responsive genes. To identify novel binding partners of beta-catenin that may control its transcriptional activity, we performed a mammalian two-hybrid screen and isolated the Tax-interacting protein (TIP-1). The in vivo complex formation between beta-catenin and TIP-1 was verified by coimmunoprecipitation, and a direct physical association was revealed by glutathione S-transferase pull-down experiments in vitro. By using a panel of deletion mutants of both proteins, we demonstrate that the interaction is mediated by the PDZ (PSD-95/DLG/ZO-1 homology) domain of TIP-1 and requires primarily the last four amino acids of beta-catenin. TIP-1 overexpression resulted in a dose-dependent decrease in the transcriptional activity of beta-catenin when tested on the TOP/FOPFLASH reporter system. Conversely, siRNA-mediated knock-down of endogenous TIP-1 slightly increased endogenous beta-catenin transactivation function. Moreover, we show that overexpression of TIP-1 reduced the proliferation and anchorage-independent growth of colorectal cancer cells. These data suggest that TIP-1 may represent a novel regulatory element in the Wnt/beta-catenin signaling pathway.
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Affiliation(s)
- Mutsumi Kanamori
- Laboratory for Genome Exploration Research Group, RIKEN Genomic Sciences Center, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama 230-0045, Japan
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Pérez-Gómez C, Matés JM, Gómez-Fabre PM, del Castillo-Olivares A, Alonso FJ, Márquez J. Genomic organization and transcriptional analysis of the human l-glutaminase gene. Biochem J 2003; 370:771-84. [PMID: 12444921 PMCID: PMC1223212 DOI: 10.1042/bj20021445] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2002] [Revised: 10/25/2002] [Accepted: 11/25/2002] [Indexed: 11/17/2022]
Abstract
In mammals, glutaminase (GA) is expressed in most tissues, but the regulation of organ-specific expression is largely unknown. Therefore, as an essential step towards studying the regulation of GA expression, the human liver-type GA (hLGA) gene has been characterized. LGA genomic sequences were isolated using the genome walking technique. Analysis and comparison of these sequences with two LGA cDNA clones and the Human Genome Project database, allowed the determination of the genomic organization of the LGA gene. The gene has 18 exons and is approx. 18 kb long. All exon/intron junction sequences conform to the GT/AG rule. Progressive deletion analysis of LGA promoter-luciferase constructs indicated that the core promoter is located between nt -141 and +410, with several potential regulatory elements: CAAT, GC, TATA-like, Ras-responsive element binding protein and specificity protein 1 (Sp1) sites. The minimal promoter was mapped within +107 and +410, where only an Sp1 binding site is present. Mutation experiments suggested that two CAAT recognition elements near the transcription-initiation site (-138 and -87), play a crucial role for optimal promoter activity. Electrophoretic mobility-shift assays confirmed the importance of CAAT- and TATA-like boxes to enhance basal transcription, and demonstrated that HNF-1 motif is a significant distal element for transcriptional regulation of the hLGA gene.
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Affiliation(s)
- Cristina Pérez-Gómez
- Departamento de Biología Molecular y Bioquímica, Laboratorio de Química de Proteínas, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain
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Olalla L, Gutiérrez A, Campos JA, Khan ZU, Alonso FJ, Segura JA, Márquez J, Aledo JC. Nuclear localization of L-type glutaminase in mammalian brain. J Biol Chem 2002; 277:38939-44. [PMID: 12163477 DOI: 10.1074/jbc.c200373200] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
In mammals, there are two different genes encoding for glutaminase isoforms, named liver (LGA) and kidney (KGA) types. LGA has long been believed to be present only in liver mitochondria from adult animals. However, we have recently reported the presence of LGA mRNA in human brain. We now describe the expression of LGA mRNA in the brain of other mammals (cow, mouse, rabbit, and rat) and in different areas of human brain as assessed by Northern blot analysis. The presence of mRNA encoding for this isoform in rat brain was further confirmed by reverse transcriptase-PCR cloning and sequencing. Although it has been well accepted that glutaminase is a mitochondrial enzyme, using newly generated isoform-specific antibodies, we have found a differential intracellular immunolocalization of both glutaminase isoforms in rat and monkey brain. In both species, KGA protein was present in mitochondria, whereas LGA protein was localized in nuclei. Furthermore, subcellular fractionation and Western blot analysis revealed that brain LGA was enriched in nuclei where it was catalytically active. Nuclear glutaminase exhibited a kinetic behavior that resembles that of the liver-type enzyme with regard to the low phosphate concentration requirement; however, nuclear glutaminase was susceptible to glutamate inhibition, a property that is absent in the rat liver enzyme.
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Affiliation(s)
- Lucía Olalla
- Departamento de Biologia Molecular y Bioquimica, Laboratorio de Quimica de Proteinas, Universidad de Málaga, 29071-Málaga, Spain
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Porter LD, Ibrahim H, Taylor L, Curthoys NP. Complexity and species variation of the kidney-type glutaminase gene. Physiol Genomics 2002; 9:157-66. [PMID: 12045296 DOI: 10.1152/physiolgenomics.00017.2002] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Increased expression of rat kidney-type glutaminase (KGA) during metabolic acidosis results from selective mRNA stabilization. This process is mediated by an 8-base AU-sequence that functions as a pH-response element (pHRE). LLC-PK1-FBPase+ cells, a pH-responsive porcine kidney cell line, express four distinct GA mRNAs. RNase H mapping indicated that three of the GA mRNAs are generated by use of alternative polyadenylation sites and are homologs of the rat KGA mRNA, while the fourth contains a different COOH-terminal coding and 3'-untranslated sequence. PCR cloning and sequencing established that the latter GA mRNA is the homolog of the human GAC mRNA. A rat GAC cDNA was also cloned from a rat kidney library. The 3'-untranslated regions of the GAC mRNAs, but not the porcine or human KGA mRNAs, contain identifiable pHREs. The human KGA gene spans 82 kb and is composed of 19 exons. The unique sequence from the hGAC cDNA is contained in a single exon. Thus in humans, alternative splicing of the initial transcript could produce two GA mRNAs, only one of which may be increased during acidosis.
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Affiliation(s)
- L David Porter
- Department of Biochemistry and Molecular Biology, Colorado State University, Fort Collins, Colorado 80523-1870, USA
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Matés JM, Pérez-Gómez C, Núñez de Castro I, Asenjo M, Márquez J. Glutamine and its relationship with intracellular redox status, oxidative stress and cell proliferation/death. Int J Biochem Cell Biol 2002; 34:439-58. [PMID: 11906817 DOI: 10.1016/s1357-2725(01)00143-1] [Citation(s) in RCA: 236] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Glutamine is a multifaceted amino acid used for hepatic urea synthesis, renal ammoniagenesis, gluconeogenesis in both liver and kidney, and as a major respiratory fuel for many cells. Decreased glutamine concentrations are found during catabolic stress and are related to susceptibility to infections. Besides, glutamine is not only an important energy source in mitochondria, but is also a precursor of the brain neurotransmitter glutamate, which is likewise used for biosynthesis of the cellular antioxidant glutathione. Reactive oxygen species, such as superoxide anions and hydrogen peroxide, function as intracellular second messengers activating, among others, apoptosis, whereas glutamine is an apoptosis suppressor. In fact, it could contribute to block apoptosis induced by exogenous agents or by intracellular stimuli. In conclusion, this article shows evidences for the important role of glutamine in the regulation of the cellular redox balance, including brain oxidative metabolism, apoptosis and tumour cell proliferation.
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Affiliation(s)
- José M Matés
- Department of Molecular Biology and Biochemistry, Faculty of Sciences, University of Málaga, Campus de Teatinos, s/n 29071 Málaga, Spain.
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Aledo JC, Rosado A, Olalla L, Campos JA, Márquez J. Overexpression, purification, and characterization of glutaminase-interacting protein, a PDZ-domain protein from human brain. Protein Expr Purif 2001; 23:411-8. [PMID: 11722177 DOI: 10.1006/prep.2001.1522] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A human brain cDNA clone coding for a novel PDZ-domain protein of 124 amino acids has been previously isolated in our laboratory. The protein was termed GIP (glutaminase-interacting protein) because it interacts with the C-terminal region of the human brain glutaminase L. Here we report the heterologous expression of GIP as a histidine-tagged fusion protein in Escherichia coli cells. The induction conditions (temperature and isopropyl beta-d-thiogalactopyranoside concentrations) were optimized in such a way that GIP accounted for about 20% of the total E. coli protein. A simple and rapid procedure for purification was developed, which yielded 17 mg of purified GIP per liter of bacterial cell culture. The apparent molecular mass of the protein by SDS-PAGE was 16 kDa, whereas in native form it was determined to be 28 kDa, which suggests dimer formation. The nature and integrity of the recombinant protein were verified by mass spectrometry analysis. The functionality of the GIP protein was tested with an in vitro activity assay: after being pulled down with glutathione S-transferase-glutaminase, GIP was revealed by Western blot using anti-GIP antibodies. Furthermore, the glutaminase activity in crude rat liver extracts was inhibited by the presence of recombinant purified GIP protein.
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Affiliation(s)
- J C Aledo
- Departamento de Biología Molecular y Bioquímica, Universidad de Málaga, Málaga, 29071, Spain
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