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Ensinck D, Gerhardt ECM, Rollan L, Huergo LF, Gramajo H, Diacovich L. The PII protein interacts with the Amt ammonium transport and modulates nitrate/nitrite assimilation in mycobacteria. Front Microbiol 2024; 15:1366111. [PMID: 38591044 PMCID: PMC11001197 DOI: 10.3389/fmicb.2024.1366111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Accepted: 03/04/2024] [Indexed: 04/10/2024] Open
Abstract
PII proteins are signal transduction proteins that belong to a widely distributed family of proteins involved in the modulation of different metabolisms in bacteria. These proteins are homotrimers carrying a flexible loop, named T-loop, which changes its conformation due to the recognition of diverse key metabolites, ADP, ATP, and 2-oxoglutarate. PII proteins interact with different partners to primarily regulate a set of nitrogen pathways. In some organisms, PII proteins can also control carbon metabolism by interacting with the biotin carboxyl carrier protein (BCCP), a key component of the acetyl-CoA carboxylase (ACC) enzyme complex, inhibiting its activity with the consequent reduction of fatty acid biosynthesis. Most bacteria contain at least two PII proteins, named GlnB and GlnK, with different regulatory roles. In mycobacteria, only one PII protein was identified, and the three-dimensional structure was solved, however, its physiological role is unknown. In this study we purified the Mycobacterium tuberculosis (M. tb) PII protein, named GlnB, and showed that it weakly interacts with the AccA3 protein, the α subunit shared by the three different, and essential, Acyl-CoA carboxylase complexes (ACCase 4, 5, and 6) present in M. tb. A M. smegmatis deletion mutant, ∆MsPII, exhibited a growth deficiency on nitrate and nitrite as unique nitrogen sources, and accumulated nitrite in the culture supernatant. In addition, M. tb PII protein was able to interact with the C-terminal domain of the ammonium transporter Amt establishing the ancestral role for this PII protein as a GlnK functioning protein.
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Affiliation(s)
- Delfina Ensinck
- Instituto de Biología Molecular y Celular de Rosario (IBR-CONICET), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Rosario, Argentina
| | - Edileusa C. M. Gerhardt
- Department of Biochemistry and Molecular Biology, Universidade Federal do Paraná, Curitiba, Paraná, Brazil
| | - Lara Rollan
- Instituto de Biología Molecular y Celular de Rosario (IBR-CONICET), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Rosario, Argentina
| | - Luciano F. Huergo
- Setor Litoral, Federal University of Paraná, Universidade Federal do Paraná (UFPR), Matinhos, Paraná, Brazil
- Graduated Program in Sciences-Biochemistry, Universidade Federal do Paraná (UFPR), Curitiba, Paraná, Brazil
| | - Hugo Gramajo
- Instituto de Biología Molecular y Celular de Rosario (IBR-CONICET), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Rosario, Argentina
| | - Lautaro Diacovich
- Instituto de Biología Molecular y Celular de Rosario (IBR-CONICET), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Rosario, Argentina
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2
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Chubatsu LS, Gerhardt ECM, Souza EM. A simple preparation of prestained molecular markers for electrophoresis using inexpensive and readily available proteins. Anal Biochem 2023; 676:115231. [PMID: 37414351 DOI: 10.1016/j.ab.2023.115231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Revised: 07/02/2023] [Accepted: 07/03/2023] [Indexed: 07/08/2023]
Abstract
Protein electrophoresis in polyacrylamide gels in the presence of sodium dodecyl sulfate (SDS-PAGE) is one of the most commonly performed procedures in biochemical laboratories. It requires the use of molecular weight (MW) markers as an internal technical control and to determine the migration rate of a particular protein. In this work, we describe a simple method for preparing "homemade" prestained protein markers using readily available cow's milk and chicken egg white proteins without the need of any major protein purification step, and produce prestained MW markers ranging from 19 to 98 kDa.
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Affiliation(s)
- Leda S Chubatsu
- Department of Biochemistry and Molecular Biology, Universidade Federal do Paraná, Curitiba, PR, Brazil.
| | - Edileusa C M Gerhardt
- Department of Biochemistry and Molecular Biology, Universidade Federal do Paraná, Curitiba, PR, Brazil
| | - Emanuel M Souza
- Department of Biochemistry and Molecular Biology, Universidade Federal do Paraná, Curitiba, PR, Brazil
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3
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Zattoni IF, Huergo LF, Gerhardt ECM, Nardin JM, Dos Santos AMF, de Moraes Rego FG, Picheth G, Moure VR, Valdameri G. Multiplexed flow cytometric approach for detection of anti-SARS-CoV-2 IgG, IgM and IgA using beads covalently coupled to the nucleocapsid protein. Lett Appl Microbiol 2022; 74:863-872. [PMID: 35148433 PMCID: PMC9115257 DOI: 10.1111/lam.13674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Revised: 01/11/2022] [Accepted: 01/13/2022] [Indexed: 11/30/2022]
Abstract
Flow cytometry has emerged as a promising technique for detection of SARS‐CoV‐2 antibodies. In this study, we developed an innovative strategy for simultaneous detection of immunoglobulin G (IgG), IgM and IgA. The SARS‐CoV‐2 nucleocapsid protein was covalently bound to functional beads surface applying sulpho‐SMCC chemistry. BUV395 anti‐IgG, BB515 anti‐IgM, biotinylated anti‐IgA1/IgA2 and BV421 streptavidin were used as fluorophore conjugated secondary antibodies. Serum and antibodies reaction conditions were optimized for each antibody isotype detection and a multiplexed detection assay was developed. This new cell‐free assay efficiently discriminate COVID‐19 negative and positive samples. The simultaneous detection of IgG, IgM and IgA showed a sensitivity of 88·5–96·2% and specificity of 100%. This novel strategy opens a new avenue for flow cytometry‐based diagnosis.
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Affiliation(s)
- Ingrid Fatima Zattoni
- Pharmaceutical Sciences Graduate Program, Laboratory of Cancer Drug Resistance, Federal University of Paraná, 80210-170, Curitiba, PR, Brazil
| | - Luciano F Huergo
- Setor Litoral, Federal University of Paraná, 83260-000, Matinhos, PR, Brazil
| | - Edileusa C M Gerhardt
- Department of Biochemistry and Molecular Biology, Federal University of Paraná, 80060-000, Curitiba, PR, Brazil
| | | | | | | | - Geraldo Picheth
- Department of Clinical Analysis, Federal University of Paraná, 80210-170, Curitiba, PR, Brazil
| | - Vivian Rotuno Moure
- Pharmaceutical Sciences Graduate Program, Laboratory of Cancer Drug Resistance, Federal University of Paraná, 80210-170, Curitiba, PR, Brazil.,Department of Clinical Analysis, Federal University of Paraná, 80210-170, Curitiba, PR, Brazil
| | - Glaucio Valdameri
- Pharmaceutical Sciences Graduate Program, Laboratory of Cancer Drug Resistance, Federal University of Paraná, 80210-170, Curitiba, PR, Brazil.,Department of Clinical Analysis, Federal University of Paraná, 80210-170, Curitiba, PR, Brazil
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4
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Huergo LF, Conzentino M, Gonçalves MV, Gernet MV, Reis RA, Pedrosa FO, Baura VA, Pires A, Gerhardt ECM, Tuleski TR, Balsanelli E, Guizelini D, Souza EM, Chandra G, Cruz LM. The microbiome of a shell mound: ancient anthropogenic waste as a source of Streptomyces degrading recalcitrant polysaccharides. World J Microbiol Biotechnol 2021; 37:210. [PMID: 34719741 DOI: 10.1007/s11274-021-03174-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Accepted: 10/18/2021] [Indexed: 10/20/2022]
Abstract
Metagenome amplicon DNA sequencing and traditional cell culture techniques are helping to uncover the diversity and the biotechnological potential of prokaryotes in different habitats around the world. It has also had a profound impact on microbial taxonomy in the last decades. Here we used metagenome 16S rDNA amplicon sequencing to reveal the microbiome composition of different layers of an anthropogenic soil collected at a shell mound Sambaqui archeological site. The Samabaqui soil microbiome is mainly composed by phyla Acidobacteria, Rokubacteria, Proteobacteria and Thaumarchaeota. Using culture-dependent analysis we obtained few Streptomyces isolates from the Sambaqui soil. One of the isolates, named Streptomyces sp. S3, was able to grow in minimal medium containing recalcitrant polysaccharides including chitin, xylan, carboxymethylcellulose or microcrystalline cellulose as sole carbon sources. The activities of enzymes degrading these compounds were confirmed in cell free supernatants. The genome sequence revealed not only an arsenal of genes related to polysaccharides degradation but also biosynthetic gene clusters which may be involved in the production of biotechnologically interesting secondary metabolites.
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Affiliation(s)
| | | | | | | | | | - Fábio O Pedrosa
- Departamento de Bioquímica e Biologia Molecular, UFPR, Curitiba, PR, Brazil
| | - Valter A Baura
- Departamento de Bioquímica e Biologia Molecular, UFPR, Curitiba, PR, Brazil
| | - Araceli Pires
- Departamento de Bioquímica e Biologia Molecular, UFPR, Curitiba, PR, Brazil
| | | | - Thalita R Tuleski
- Departamento de Bioquímica e Biologia Molecular, UFPR, Curitiba, PR, Brazil
| | - Eduardo Balsanelli
- Departamento de Bioquímica e Biologia Molecular, UFPR, Curitiba, PR, Brazil
| | - Dieval Guizelini
- Programa de Pós-graduação em Bioinformática, UFPR, Curitiba, PR, Brazil
| | - Emanuel M Souza
- Departamento de Bioquímica e Biologia Molecular, UFPR, Curitiba, PR, Brazil
| | - Govind Chandra
- Department of Molecular Microbiology, John Innes Centre, Norwich Research Park, Norwich, NR4 7UH, UK
| | - Leonardo M Cruz
- Departamento de Bioquímica e Biologia Molecular, UFPR, Curitiba, PR, Brazil
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5
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Gravina F, Degaut FL, Gerhardt ECM, Pedrosa FO, Souza EM, Antônio de Souza G, Huergo LF. The protein-protein interaction network of the Escherichia coli EIIA Ntr regulatory protein reveals a role in cell motility and metabolic control. Res Microbiol 2021; 172:103882. [PMID: 34563668 DOI: 10.1016/j.resmic.2021.103882] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Revised: 09/10/2021] [Accepted: 09/13/2021] [Indexed: 01/17/2023]
Abstract
The nitrogen-related PTSNtr system, present in many Proteobacteria including Escherichia coli, acts as a phosphorelay cascade composed of the EINtr, NPr and EIIANtr proteins. Phosphotransfer initiates with phosphoenolpyruvate-dependent EINtr autophosphorylation, the phosphoryl group is then transferred to NPr and finally to a conserved histidine residue on EIIANtr. The reporter metabolites L-glutamine and 2-oxoglutarate reciprocally regulate EINtr autophosphorylation (Lee et al. 2013) and consequently the phosphorylation status of the PTSNtr components is controlled by the availability of nitrogen and carbon. The final phosphate acceptor, EIIANtr, regulates a range of cellular process by acting as the central hub of a complex protein-protein interaction network. Contact between EIIANtr and its target proteins is usually regulated by the EIIANtr phosphorylation status. In this study we performed ligand fishing assays coupled to label-free quantitative proteomics to examine the protein-protein interaction network of E. coli EIIANtr and a phosphomimic variant of the protein. The ligand fishing data, along with phenotypic analysis, indicated that EIIANtr interacts with proteins related to chemotaxis and thereby regulates cell motility. Important metabolic enzymes were also identified as potential EIIANtr binding partners.
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Affiliation(s)
- Fernanda Gravina
- Departamento de Bioquímica e Biologia Molecular, UFPR Curitiba, PR, Brazil
| | - Flávia L Degaut
- Departamento de Bioquímica e Biologia Molecular, UFPR Curitiba, PR, Brazil
| | | | - Fabio O Pedrosa
- Departamento de Bioquímica e Biologia Molecular, UFPR Curitiba, PR, Brazil
| | - Emanuel M Souza
- Departamento de Bioquímica e Biologia Molecular, UFPR Curitiba, PR, Brazil
| | | | - Luciano F Huergo
- Departamento de Bioquímica e Biologia Molecular, UFPR Curitiba, PR, Brazil; Setor Litoral, UFPR Matinhos, PR, Brazil.
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6
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Huergo LF, Selim KA, Conzentino MS, Gerhardt ECM, Santos ARS, Wagner B, Alford JT, Deobald N, Pedrosa FO, de Souza EM, Nogueira MB, Raboni SM, Souto D, Rego FGM, Zanette DL, Aoki MN, Nardin JM, Fornazari B, Morales HMP, Borges VA, Nelde A, Walz JS, Becker M, Schneiderhan-Marra N, Rothbauer U, Reis RA, Forchhammer K. Magnetic Bead-Based Immunoassay Allows Rapid, Inexpensive, and Quantitative Detection of Human SARS-CoV-2 Antibodies. ACS Sens 2021; 6:703-708. [PMID: 33496577 PMCID: PMC7860136 DOI: 10.1021/acssensors.0c02544] [Citation(s) in RCA: 38] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Accepted: 01/20/2021] [Indexed: 12/12/2022]
Abstract
Immunological methods to detect SARS-CoV-2 seroconversion in humans are important to track COVID-19 cases and the humoral response to SARS-CoV-2 infections and immunization to future vaccines. The aim of this work was to develop a simple chromogenic magnetic bead-based immunoassay which allows rapid, inexpensive, and quantitative detection of human antibodies against SARS-CoV-2 in serum, plasma, or blood. Recombinant 6xHis-tagged SARS-CoV-2 Nucleocapsid protein was mobilized on the surface of Ni2+ magnetic beads and challenged with serum or blood samples obtained from controls or COVID-19 cases. The beads were washed, incubated with anti-human IgG-HPR conjugate, and immersed into a solution containing a chromogenic HPR substrate. Bead transfer and homogenization between solutions was aided by a simple low-cost device. The method was validated by two independent laboratories, and the performance to detect SARS-CoV-2 seroconversion in humans was in the same range as obtained using the gold standard immunoassays ELISA and Luminex, though requiring only a fraction of consumables, instrumentation, time to deliver results, and volume of sample. Furthermore, the results obtained with the method described can be visually interpreted without compromising accuracy as demonstrated by validation at a point-of-care unit. The magnetic bead immunoassay throughput can be customized on demand and is readily adapted to be used with any other 6xHis tagged protein or peptide as antigen to track other diseases.
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Affiliation(s)
- Luciano F. Huergo
- Setor Litoral, Federal University of
Paraná (UFPR) Matinhos, PR 83260-000,
Brazil
| | - Khaled A. Selim
- Interfaculty Institute for Microbiology and Infection
Medicine, Eberhard Karls University of Tübingen, 72074
Tübingen,Germany
| | | | - Edileusa C. M. Gerhardt
- Biochemistry and Molecular Biology Department,
Federal University of Paraná (UFPR) Curitiba, PR
80060-000, Brazil
| | - Adrian R. S. Santos
- Biochemistry and Molecular Biology Department,
Federal University of Paraná (UFPR) Curitiba, PR
80060-000, Brazil
| | - Berenike Wagner
- Interfaculty Institute for Microbiology and Infection
Medicine, Eberhard Karls University of Tübingen, 72074
Tübingen,Germany
| | - Janette T. Alford
- Interfaculty Institute for Microbiology and Infection
Medicine, Eberhard Karls University of Tübingen, 72074
Tübingen,Germany
| | - Nelli Deobald
- Interfaculty Institute for Microbiology and Infection
Medicine, Eberhard Karls University of Tübingen, 72074
Tübingen,Germany
| | - Fabio O. Pedrosa
- Biochemistry and Molecular Biology Department,
Federal University of Paraná (UFPR) Curitiba, PR
80060-000, Brazil
| | - Emanuel M. de Souza
- Biochemistry and Molecular Biology Department,
Federal University of Paraná (UFPR) Curitiba, PR
80060-000, Brazil
| | - Meri B. Nogueira
- Complexo Hospital das Clínicas,
Federal University of Paraná (UFPR) Curitiba, PR
80060-000, Brazil
| | - Sônia M. Raboni
- Complexo Hospital das Clínicas,
Federal University of Paraná (UFPR) Curitiba, PR
80060-000, Brazil
| | - Dênio Souto
- Chemistry Departament, Federal University
of Paraná (UFPR), Curitiba, PR 80060-000,
Brazil
| | - Fabiane G. M. Rego
- Post-Graduation Program in Pharmaceutical Sciences,
Federal University of Paraná (UFPR), Curitiba, PR
80060-000, Brazil
| | | | - Mateus N. Aoki
- Instituto Carlos Chagas -
FioCruz, Curitiba, PR 81310-020, Brazil
| | | | | | | | - Vânia A. Borges
- Secretaria Municipal de Saúde de
Guaratuba, Guaratuba, PR 83280-000, Brazil
| | - Annika Nelde
- Clinical Collaboration Unit Translational Immunology,
German Cancer Consortium (DKTK), Department of Internal Medicine, University
Hospital Tübingen, 72076 Tübingen,
Germany
- Department of Immunology, Institute for Cell Biology,
Tübingen University, 72076 Tübingen,
Germany
- Cluster of Excellence iFIT (EXC2180)
“Image-Guided and Functionally Instructed Tumor Therapies”,
Tübingen University, 72076 Tübingen,
Germany
| | - Juliane S. Walz
- Clinical Collaboration Unit Translational Immunology,
German Cancer Consortium (DKTK), Department of Internal Medicine, University
Hospital Tübingen, 72076 Tübingen,
Germany
- Department of Immunology, Institute for Cell Biology,
Tübingen University, 72076 Tübingen,
Germany
- Cluster of Excellence iFIT (EXC2180)
“Image-Guided and Functionally Instructed Tumor Therapies”,
Tübingen University, 72076 Tübingen,
Germany
- Department of Hematology, Oncology, Clinical
Immunology and Rheumatology, University Hospital
Tübingen, 72076 Tübingen, Germany
| | - Matthias Becker
- NMI Natural and Medical Sciences
Institute at the University of Tübingen, 72770 Tübingen,
Germany
| | | | - Ulrich Rothbauer
- NMI Natural and Medical Sciences
Institute at the University of Tübingen, 72770 Tübingen,
Germany
- Pharmaceutical Biotechnology,
Tübingen University, 72076 Tübingen,
Germany
| | - Rodrigo A. Reis
- Setor Litoral, Federal University of
Paraná (UFPR) Matinhos, PR 83260-000,
Brazil
| | - Karl Forchhammer
- Interfaculty Institute for Microbiology and Infection
Medicine, Eberhard Karls University of Tübingen, 72074
Tübingen,Germany
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7
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Gravina F, Sanchuki HS, Rodrigues TE, Gerhardt ECM, Pedrosa FO, Souza EM, Valdameri G, de Souza GA, Huergo LF. Proteome analysis of an Escherichia coli ptsN-null strain under different nitrogen regimes. J Proteomics 2017; 174:28-35. [PMID: 29274402 DOI: 10.1016/j.jprot.2017.12.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Revised: 11/29/2017] [Accepted: 12/13/2017] [Indexed: 12/12/2022]
Abstract
The carbohydrate-uptake phosphorelay PTS system plays a key role in metabolic regulation in Bacteria controlling the utilization of secondary carbon sources. Some bacteria, such as Escherichia coli, encode a paralogous system named PTSNtr (nitrogen related PTS). PTSNtr is composed of EINtr (ptsP), NPr (ptsO), and EIIANtr (ptsN). These proteins act as a phosphorelay system from phosphoenolpyruvate to EINtr, NPr and them to EIIANtr. PTSNtr is not involved in carbohydrate uptake and it may be dedicated to performing regulatory functions. The phosphorylation state of EINtr is regulated by allosteric binding of glutamine and 2-oxoglutarate, metabolites whose intracellular levels reflect the nitrogen status. Although PTSNtr is designated as having nitrogen-sensory properties, no major effect of this system on nitrogen regulation has been described in E. coli. Here we show that an E. coli ptsN deletion mutant has impaired growth in minimal medium. Proteome analysis of the ∆ptsN strain under different nitrogen regimes revealed no involvement in regulation of the canonical nitrogen regulatory (Ntr) system. The proteomic data support the conclusion that ptsN is required to balance the activities of the sigma factors RpoS and RpoD in such way that, in the absence of ptsN, RpoS-dependent genes are preferentially expressed. SIGNIFICANCE The nitrogen related PTSNtr phosphorelay system has been hypothesized to participate in the control of nitrogen metabolism. Here we used a proteomics approach to show that an Escherichia coli ptsN null strain, which misses the final module of PTSNtr phosphorelay, has no significant effects on nitrogen metabolism under different nitrogen regimes. We noted that ptsN is required for fitness under minimal medium and for the proper balance between RpoS and sigma 70 activities in such way that, in the absence of ptsN, RpoS-dependent genes are preferentially expressed.
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Affiliation(s)
- Fernanda Gravina
- Departamento de Bioquímica e Biologia Molecular, UFPR, Curitiba, PR, Brazil
| | - Heloisa S Sanchuki
- Departamento de Bioquímica e Biologia Molecular, UFPR, Curitiba, PR, Brazil
| | - Thiago E Rodrigues
- Departamento de Bioquímica e Biologia Molecular, UFPR, Curitiba, PR, Brazil
| | | | - Fábio O Pedrosa
- Departamento de Bioquímica e Biologia Molecular, UFPR, Curitiba, PR, Brazil
| | - Emanuel M Souza
- Departamento de Bioquímica e Biologia Molecular, UFPR, Curitiba, PR, Brazil
| | - Gláucio Valdameri
- Departamento de Bioquímica e Biologia Molecular, UFPR, Curitiba, PR, Brazil; Departamento de Análises Clínicas, UFPR, Curitiba, PR, Brazil
| | - Gustavo A de Souza
- Oslo University Hospital, The Proteomics Core Facility, Rikshospitalet, Oslo, Norway; Instituto do Cérebro, UFRN, Natal, RN, Brazil
| | - Luciano F Huergo
- Departamento de Bioquímica e Biologia Molecular, UFPR, Curitiba, PR, Brazil; Setor Litoral, UFPR, Matinhos, PR, Brazil.
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8
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Castro FF, Pinheiro ABP, Gerhardt ECM, Oliveira MAS, Barbosa-Tessmann IP. Production, purification, and characterization of a novel serine-esterase from Aspergillus westerdijkiae. J Basic Microbiol 2017; 58:131-143. [PMID: 29193163 DOI: 10.1002/jobm.201700509] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Revised: 10/20/2017] [Accepted: 11/09/2017] [Indexed: 01/16/2023]
Abstract
Esterases hydrolyze water soluble short chain fatty acids esters and are biotechnologically important. A strain of Aspergillus westerdijkiae isolated from cooking oil for recycling was found to secrete an esterase. The best enzyme production (19-24 U/ml of filtrate) culture conditions were stablished. The protein was purified using ammonium sulphate precipitation, dialysis, and a chromatographic step in Sephacryl S-200 HR. The 32 kDa purified protein presented an optimal temperature of 40°C, with a T50 of 48.95°C, and an optimal pH of 8.0. KM and Vmax were 638.11 µM for p-NPB and 5.47 µmol of released p-NP · min-1 · µg-1 of protein, respectively. The purified enzyme was partially active in the presence of 25% acetone. PMSF inhibited the enzyme, indicating that it is a serine hydrolase. MS enzyme peptides sequences were used to find the protein in the A. westerdijkiae sequenced genome. A structure model demonstrated that the protein is a member of the a/ß -hydrolase fold superfamily.
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Affiliation(s)
- Fausto F Castro
- Department of Biochemistry, Maringá State University, Maringá, Paraná, Brazil
| | - Ana B P Pinheiro
- Department of Biochemistry, Maringá State University, Maringá, Paraná, Brazil
| | | | - Marco A S Oliveira
- Department of Biochemistry, Maringá State University, Maringá, Paraná, Brazil
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9
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Gerhardt ECM, Moure VR, Souza AW, Pedrosa FO, Souza EM, Diacovich L, Gramajo H, Huergo LF. Expression and purification of untagged GlnK proteins from actinobacteria. EXCLI J 2017; 16:949-958. [PMID: 28900375 PMCID: PMC5579400 DOI: 10.17179/excli2017-394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Accepted: 06/12/2017] [Indexed: 11/16/2022]
Abstract
The PII protein family constitutes one of the most conserved and well distributed family of signal transduction proteins in nature. These proteins play key roles in nitrogen and carbon metabolism. PII function has been well documented in Gram-negative bacteria. However, there are very few reports describing the in vitro properties and function of PII derived from Gram-positive bacteria. Here we present the heterologous expression and efficient purification protocols for untagged PII from three Actinobacteria of medical and biotechnological interest namely: Mycobacterium tuberculosis, Rhodococcus jostii and Streptomyces coelicolor. Circular dichroism and gel filtration analysis supported that the purified proteins are correctly folded. The purification protocol described here will facilitate biochemical studies and help to uncover the biochemical functions of PII proteins in Actinobacteria.
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Affiliation(s)
| | - Vivian R Moure
- Departamento de Bioquímica e Biologia Molecular, UFPR, Curitiba, Brazil
| | - Andrey W Souza
- Departamento de Bioquímica e Biologia Molecular, UFPR, Curitiba, Brazil
| | - Fabio O Pedrosa
- Departamento de Bioquímica e Biologia Molecular, UFPR, Curitiba, Brazil
| | - Emanuel M Souza
- Departamento de Bioquímica e Biologia Molecular, UFPR, Curitiba, Brazil
| | - Lautaro Diacovich
- Instituto de Biologia Molecular y Celular de Rosario (IBR-CONICET), Facultad de Ciencias Bioquimicas y Farmaceuticas, Universidad Nacional de Rosario, Rosario, Argentina
| | - Hugo Gramajo
- Instituto de Biologia Molecular y Celular de Rosario (IBR-CONICET), Facultad de Ciencias Bioquimicas y Farmaceuticas, Universidad Nacional de Rosario, Rosario, Argentina
| | - Luciano F Huergo
- Departamento de Bioquímica e Biologia Molecular, UFPR, Curitiba, Brazil.,Setor Litoral, UFPR, Matinhos, Brazil
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10
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Sanchuki HBS, Gravina F, Rodrigues TE, Gerhardt ECM, Pedrosa FO, Souza EM, Raittz RT, Valdameri G, de Souza GA, Huergo LF. Dynamics of the Escherichia coli proteome in response to nitrogen starvation and entry into the stationary phase. Biochim Biophys Acta Proteins Proteom 2016; 1865:344-352. [PMID: 27939605 DOI: 10.1016/j.bbapap.2016.12.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Revised: 12/02/2016] [Accepted: 12/06/2016] [Indexed: 01/31/2023]
Abstract
Nitrogen is needed for the biosynthesis of biomolecules including proteins and nucleic acids. In the absence of fixed nitrogen prokaryotes such as E. coli immediately ceases growth. Ammonium is the preferred nitrogen source for E. coli supporting the fastest growth rates. Under conditions of ammonium limitation, E. coli can use alternative nitrogen sources to supply ammonium ions and this reprogramming is led by the induction of the NtrC regulon. Here we used label free proteomics to determine the dynamics of E. coli proteins expression in response to ammonium starvation in both the short (30min) and the longer (60min) starvation. Protein abundances and post-translational modifications confirmed that activation of the NtrC regulon acts as the first line of defense against nitrogen starvation. The ribosome inactivating protein Rmf was induced shortly after ammonium exhaustion and this was preceded by induction of other ribosome inactivating proteins such as Hpf and RaiA supporting the hypothesis that ribosome shut-down is a key process during nitrogen limitation stress. The proteomic data revealed that growth arrest due to nitrogen starvation correlates with the accumulation of proteins involved in DNA condensation, RNA and protein catabolism and ribosome hibernation. Collectively, these proteome adaptations will result in metabolic inactive cells which are likely to exhibit multidrug tolerance.
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Affiliation(s)
| | - Fernanda Gravina
- Departamento de Bioquímica e Biologia Molecular, UFPR, Curitiba, PR, Brazil
| | - Thiago E Rodrigues
- Departamento de Bioquímica e Biologia Molecular, UFPR, Curitiba, PR, Brazil
| | | | - Fábio O Pedrosa
- Departamento de Bioquímica e Biologia Molecular, UFPR, Curitiba, PR, Brazil
| | - Emanuel M Souza
- Departamento de Bioquímica e Biologia Molecular, UFPR, Curitiba, PR, Brazil
| | - Roberto T Raittz
- Setor de Educação Profissional e Tecnológica, UFPR, Curitiba, PR, Brazil
| | - Glaucio Valdameri
- Departamento de Bioquímica e Biologia Molecular, UFPR, Curitiba, PR, Brazil; Departamento de Análises Clínicas, UFPR, Curitiba, PR, Brazil
| | - Gustavo A de Souza
- Department of Immunology, University of Oslo and Oslo University Hospital, The Proteomics Core Facility, Rikshospitalet, Oslo, Norway; Instituto do Cérebro, UFRN, Natal, RN, Brazil
| | - Luciano F Huergo
- Departamento de Bioquímica e Biologia Molecular, UFPR, Curitiba, PR, Brazil; Setor Litoral, UFPR, Matinhos, PR, Brazil.
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11
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Hauf W, Schmid K, Gerhardt ECM, Huergo LF, Forchhammer K. Interaction of the Nitrogen Regulatory Protein GlnB (P II) with Biotin Carboxyl Carrier Protein (BCCP) Controls Acetyl-CoA Levels in the Cyanobacterium Synechocystis sp. PCC 6803. Front Microbiol 2016; 7:1700. [PMID: 27833596 PMCID: PMC5080355 DOI: 10.3389/fmicb.2016.01700] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Accepted: 10/12/2016] [Indexed: 11/13/2022] Open
Abstract
The family of PII signal transduction proteins (members GlnB, GlnK, NifI) plays key roles in various cellular processes related to nitrogen metabolism at different functional levels. Recent studies implied that PII proteins may also be involved in the regulation of fatty acid metabolism, since GlnB proteins from Proteobacteria and from Arabidopsis thaliana were shown to interact with biotin carboxyl carrier protein (BCCP) of acetyl-CoA carboxylase (ACC). In case of Escherichia coli ACCase, this interaction reduces the kcat of acetyl-CoA carboxylation, which should have a marked impact on the acetyl-CoA metabolism. In this study we show that the PII protein of a unicellular cyanobacterium inhibits the biosynthetic activity of E. coli ACC and also interacts with cyanobacterial BCCP in an ATP and 2-oxoglutarate dependent manner. In a PII mutant strain of Synechocystis strain PCC 6803, the lacking control leads to reduced acetyl-CoA levels, slightly increased levels of fatty acids and formation of lipid bodies as well as an altered fatty acid composition.
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Affiliation(s)
- Waldemar Hauf
- Interfaculty Institute of Microbiology and Infection Medicine Tübingen, Eberhard-Karls-Universität Tübingen Tübingen, Germany
| | - Katharina Schmid
- Interfaculty Institute of Microbiology and Infection Medicine Tübingen, Eberhard-Karls-Universität Tübingen Tübingen, Germany
| | - Edileusa C M Gerhardt
- Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Paraná Curitiba, Brazil
| | - Luciano F Huergo
- Departamento de Bioquímica e Biologia Molecular, Universidade Federal do ParanáCuritiba, Brazil; Setor Litoral, Universidade Federal do ParanáMatinhos, Brazil
| | - Karl Forchhammer
- Interfaculty Institute of Microbiology and Infection Medicine Tübingen, Eberhard-Karls-Universität Tübingen Tübingen, Germany
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12
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Oliveira MAS, Gerhardt ECM, Huergo LF, Souza EM, Pedrosa FO, Chubatsu LS. 2-Oxoglutarate levels control adenosine nucleotide binding by Herbaspirillum seropedicae PII proteins. FEBS J 2015; 282:4797-809. [PMID: 26433003 DOI: 10.1111/febs.13542] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2015] [Revised: 09/22/2015] [Accepted: 09/29/2015] [Indexed: 11/29/2022]
Abstract
Nitrogen metabolism in Proteobacteria is controlled by the Ntr system, in which PII proteins play a pivotal role, controlling the activity of target proteins in response to the metabolic state of the cell. Characterization of the binding of molecular effectors to these proteins can provide information about their regulation. Here, the binding of ATP, ADP and 2-oxoglutarate (2-OG) to the Herbaspirillum seropedicae PII proteins, GlnB and GlnK, was characterized using isothermal titration calorimetry. Results show that these proteins can bind three molecules of ATP, ADP and 2-OG with homotropic negative cooperativity, and 2-OG binding stabilizes the binding of ATP. Results also show that the affinity of uridylylated forms of GlnB and GlnK for nucleotides is significantly lower than that of the nonuridylylated proteins. Furthermore, fluctuations in the intracellular concentration of 2-OG in response to nitrogen availability are shown. Results suggest that under nitrogen-limiting conditions, PII proteins tend to bind ATP and 2-OG. By contrast, after an ammonium shock, a decrease in the 2-OG concentration is observed causing a decrease in the affinity of PII proteins for ATP. This phenomenon may facilitate the exchange of ATP for ADP on the ligand-binding pocket of PII proteins, thus it is likely that under low ammonium, low 2-OG levels would favor the ADP-bound state.
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Affiliation(s)
- Marco A S Oliveira
- Department of Biochemistry and Molecular Biology, Universidade Federal do Parana, Curitiba, Brazil
| | - Edileusa C M Gerhardt
- Department of Biochemistry and Molecular Biology, Universidade Federal do Parana, Curitiba, Brazil
| | - Luciano F Huergo
- Department of Biochemistry and Molecular Biology, Universidade Federal do Parana, Curitiba, Brazil
| | - Emanuel M Souza
- Department of Biochemistry and Molecular Biology, Universidade Federal do Parana, Curitiba, Brazil
| | - Fábio O Pedrosa
- Department of Biochemistry and Molecular Biology, Universidade Federal do Parana, Curitiba, Brazil
| | - Leda S Chubatsu
- Department of Biochemistry and Molecular Biology, Universidade Federal do Parana, Curitiba, Brazil
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13
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Rodrigues TE, Gerhardt ECM, Oliveira MA, Chubatsu LS, Pedrosa FO, Souza EM, Souza GA, Müller-Santos M, Huergo LF. Search for novel targets of the PII signal transduction protein in Bacteria identifies the BCCP component of acetyl-CoA carboxylase as a PII binding partner. Mol Microbiol 2014; 91:751-61. [PMID: 24329683 DOI: 10.1111/mmi.12493] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/10/2013] [Indexed: 11/29/2022]
Abstract
The PII family comprises a group of widely distributed signal transduction proteins. The archetypal function of PII is to regulate nitrogen metabolism in bacteria. As PII can sense a range of metabolic signals, it has been suggested that the number of metabolic pathways regulated by PII may be much greater than described in the literature. In order to provide experimental evidence for this hypothesis a PII protein affinity column was used to identify PII targets in Azospirillum brasilense. One of the PII partners identified was the biotin carboxyl carrier protein (BCCP), a component of the acetyl-CoA carboxylase which catalyses the committed step in fatty acid biosynthesis. As BCCP had been previously identified as a PII target in Arabidopsis thaliana we hypothesized that the PII -BCCP interaction would be conserved throughout Bacteria. In vitro experiments using purified proteins confirmed that the PII -BCCP interaction is conserved in Escherichia coli. The BCCP-PII interaction required MgATP and was dissociated by increasing 2-oxoglutarate. The interaction was modestly affected by the post-translational uridylylation status of PII ; however, it was completely dependent on the post-translational biotinylation of BCCP.
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Affiliation(s)
- Thiago E Rodrigues
- Instituto Nacional de Ciência e Tecnologia da Fixação Biológica de Nitrogênio, Departamento de Bioquímica e Biologia Molecular, UFPR, Curitiba, PR, Brazil
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14
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Gerhardt ECM, Araújo LM, Ribeiro RR, Chubatsu LS, Scarduelli M, Rodrigues TE, Monteiro RA, Pedrosa FO, Souza EM, Huergo LF. Influence of the ADP/ATP ratio, 2-oxoglutarate and divalent ions on Azospirillum brasilense PII protein signalling. Microbiology (Reading) 2012; 158:1656-1663. [PMID: 22461486 DOI: 10.1099/mic.0.058446-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Proteins belonging to the P(II) family coordinate cellular nitrogen metabolism by direct interaction with a variety of enzymes, transcriptional regulators and transporters. The sensing function of P(II) relies on its ability to bind the nitrogen/carbon signalling molecule 2-oxoglutarate (2-OG). In Proteobacteria, P(II) is further subject to reversible uridylylation according to the intracellular levels of glutamine, which reflect the cellular nitrogen status. A number of P(II) proteins have been shown to bind ADP and ATP in a competitive manner, suggesting that P(II) might act as an energy sensor. Here, we analyse the influence of the ADP/ATP ratio, 2-OG levels and divalent metal ions on in vitro uridylylation of the Azospirillum brasilense P(II) proteins GlnB and GlnZ, and on interaction with their targets AmtB, DraG and DraT. The results support the notion that the cellular concentration of 2-OG is a key factor governing occupation of the GlnB and GlnZ nucleotide binding sites by ATP or ADP, with high 2-OG levels favouring the occupation of P(II) by ATP. Both P(II) uridylylation and interaction with target proteins responded to the ADP/ATP ratio within the expected physiological range, supporting the concept that P(II) proteins might act as cellular energy sensors.
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Affiliation(s)
- Edileusa C M Gerhardt
- Instituto Nacional de Ciência e Tecnologia da Fixação Biológica de Nitrogênio, Departamento de Bioquímica e Biologia Molecular, Setor de Ciências Biológica, Universidade Federal do Paraná, Centro Politécnico, Jardim das Américas, Caixa Postal 19046, UFPR Curitiba, Paraná, Brazil
| | - Luíza M Araújo
- Instituto Nacional de Ciência e Tecnologia da Fixação Biológica de Nitrogênio, Departamento de Bioquímica e Biologia Molecular, Setor de Ciências Biológica, Universidade Federal do Paraná, Centro Politécnico, Jardim das Américas, Caixa Postal 19046, UFPR Curitiba, Paraná, Brazil
| | - Ronny R Ribeiro
- Departamento de Química, Centro Politécnico, Jardim das Américas, Caixa Postal 19081, UFPR Curitiba, Paraná, Brazil
| | - Leda S Chubatsu
- Instituto Nacional de Ciência e Tecnologia da Fixação Biológica de Nitrogênio, Departamento de Bioquímica e Biologia Molecular, Setor de Ciências Biológica, Universidade Federal do Paraná, Centro Politécnico, Jardim das Américas, Caixa Postal 19046, UFPR Curitiba, Paraná, Brazil
| | - Marcelo Scarduelli
- Instituto Nacional de Ciência e Tecnologia da Fixação Biológica de Nitrogênio, Departamento de Bioquímica e Biologia Molecular, Setor de Ciências Biológica, Universidade Federal do Paraná, Centro Politécnico, Jardim das Américas, Caixa Postal 19046, UFPR Curitiba, Paraná, Brazil
| | - Thiago E Rodrigues
- Instituto Nacional de Ciência e Tecnologia da Fixação Biológica de Nitrogênio, Departamento de Bioquímica e Biologia Molecular, Setor de Ciências Biológica, Universidade Federal do Paraná, Centro Politécnico, Jardim das Américas, Caixa Postal 19046, UFPR Curitiba, Paraná, Brazil
| | - Rose A Monteiro
- Instituto Nacional de Ciência e Tecnologia da Fixação Biológica de Nitrogênio, Departamento de Bioquímica e Biologia Molecular, Setor de Ciências Biológica, Universidade Federal do Paraná, Centro Politécnico, Jardim das Américas, Caixa Postal 19046, UFPR Curitiba, Paraná, Brazil
| | - Fábio O Pedrosa
- Instituto Nacional de Ciência e Tecnologia da Fixação Biológica de Nitrogênio, Departamento de Bioquímica e Biologia Molecular, Setor de Ciências Biológica, Universidade Federal do Paraná, Centro Politécnico, Jardim das Américas, Caixa Postal 19046, UFPR Curitiba, Paraná, Brazil
| | - Emanuel M Souza
- Instituto Nacional de Ciência e Tecnologia da Fixação Biológica de Nitrogênio, Departamento de Bioquímica e Biologia Molecular, Setor de Ciências Biológica, Universidade Federal do Paraná, Centro Politécnico, Jardim das Américas, Caixa Postal 19046, UFPR Curitiba, Paraná, Brazil
| | - Luciano F Huergo
- Instituto Nacional de Ciência e Tecnologia da Fixação Biológica de Nitrogênio, Departamento de Bioquímica e Biologia Molecular, Setor de Ciências Biológica, Universidade Federal do Paraná, Centro Politécnico, Jardim das Américas, Caixa Postal 19046, UFPR Curitiba, Paraná, Brazil
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15
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Moure VR, Razzera G, Araújo LM, Oliveira MAS, Gerhardt ECM, Müller-Santos M, Almeida F, Pedrosa FO, Valente AP, Souza EM, Huergo LF. Heat stability of Proteobacterial PII protein facilitate purification using a single chromatography step. Protein Expr Purif 2011; 81:83-88. [PMID: 21963770 DOI: 10.1016/j.pep.2011.09.008] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2011] [Revised: 09/14/2011] [Accepted: 09/18/2011] [Indexed: 02/05/2023]
Abstract
The P(II) proteins comprise a family of widely distributed signal transduction proteins that integrate the signals of cellular nitrogen, carbon and energy status, and then regulate, by protein-protein interaction, the activity of a variety of target proteins including enzymes, transcriptional regulators and membrane transporters. We have previously shown that the P(II) proteins from Azospirillum brasilense, GlnB and GlnZ, do not alter their migration behavior under native gel electrophoresis following incubated for a few minutes at 95°C. This data suggested that P(II) proteins were either resistant to high temperatures and/or that they could return to their native state after having been unfolded by heat. Here we used (1)H NMR to show that the A. brasilense GlnB is stable up to 70°C. The melting temperature (Tm) of GlnB was determined to be 84°C using the fluorescent dye Sypro-Orange. P(II) proteins from other Proteobacteria also showed a high Tm. We exploited the thermo stability of P(II) by introducing a thermal treatment step in the P(II) purification protocol, this step significantly improved the homogeneity of A. brasilense GlnB and GlnZ, Herbaspirillum seropedicae GlnB and GlnK, and of Escherichia coli GlnK. Only a single chromatography step was necessary to obtain homogeneities higher than 95%. NMR(1) and in vitro uridylylation analysis showed that A. brasilense GlnB purified using the thermal treatment maintained its folding and activity. The purification protocol described here can facilitate the study of P(II) protein family members.
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Affiliation(s)
- Vivian R Moure
- Instituto Nacional de Ciência e Tecnologia da Fixação Biológica de Nitrogênio, Department of Biochemistry and Molecular Biology, Universidade Federal do Paraná, CP 19046, Curitiba-PR 81531-990, Brazil
| | - Guilherme Razzera
- Centro Nacional de Ressonância Magnética Nuclear, Universidade Federal do Rio de Janeiro, Instituto de Bioquímica Médica, Rio de Janeiro, Brazil
| | - Luíza M Araújo
- Instituto Nacional de Ciência e Tecnologia da Fixação Biológica de Nitrogênio, Department of Biochemistry and Molecular Biology, Universidade Federal do Paraná, CP 19046, Curitiba-PR 81531-990, Brazil
| | - Marco A S Oliveira
- Instituto Nacional de Ciência e Tecnologia da Fixação Biológica de Nitrogênio, Department of Biochemistry and Molecular Biology, Universidade Federal do Paraná, CP 19046, Curitiba-PR 81531-990, Brazil
| | - Edileusa C M Gerhardt
- Instituto Nacional de Ciência e Tecnologia da Fixação Biológica de Nitrogênio, Department of Biochemistry and Molecular Biology, Universidade Federal do Paraná, CP 19046, Curitiba-PR 81531-990, Brazil
| | - Marcelo Müller-Santos
- Instituto Nacional de Ciência e Tecnologia da Fixação Biológica de Nitrogênio, Department of Biochemistry and Molecular Biology, Universidade Federal do Paraná, CP 19046, Curitiba-PR 81531-990, Brazil
| | - Fabio Almeida
- Centro Nacional de Ressonância Magnética Nuclear, Universidade Federal do Rio de Janeiro, Instituto de Bioquímica Médica, Rio de Janeiro, Brazil
| | - Fabio O Pedrosa
- Instituto Nacional de Ciência e Tecnologia da Fixação Biológica de Nitrogênio, Department of Biochemistry and Molecular Biology, Universidade Federal do Paraná, CP 19046, Curitiba-PR 81531-990, Brazil
| | - Ana P Valente
- Centro Nacional de Ressonância Magnética Nuclear, Universidade Federal do Rio de Janeiro, Instituto de Bioquímica Médica, Rio de Janeiro, Brazil
| | - Emanuel M Souza
- Instituto Nacional de Ciência e Tecnologia da Fixação Biológica de Nitrogênio, Department of Biochemistry and Molecular Biology, Universidade Federal do Paraná, CP 19046, Curitiba-PR 81531-990, Brazil
| | - Luciano F Huergo
- Instituto Nacional de Ciência e Tecnologia da Fixação Biológica de Nitrogênio, Department of Biochemistry and Molecular Biology, Universidade Federal do Paraná, CP 19046, Curitiba-PR 81531-990, Brazil.
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16
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Rodrigues TE, Souza VEP, Monteiro RA, Gerhardt ECM, Araújo LM, Chubatsu LS, Souza EM, Pedrosa FO, Huergo LF. In vitro interaction between the ammonium transport protein AmtB and partially uridylylated forms of the P(II) protein GlnZ. Biochim Biophys Acta 2011; 1814:1203-9. [PMID: 21645649 DOI: 10.1016/j.bbapap.2011.05.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2011] [Revised: 04/28/2011] [Accepted: 05/13/2011] [Indexed: 12/18/2022]
Abstract
The ammonium transport family Amt/Rh comprises ubiquitous integral membrane proteins that facilitate ammonium movement across biological membranes. Besides their role in transport, Amt proteins also play a role in sensing the levels of ammonium in the environment, a process that depends on complex formation with cytosolic proteins of the P(II) family. Trimeric P(II) proteins from a variety of organisms undergo a cycle of reversible posttranslational modification according to the prevailing nitrogen supply. In proteobacteria, P(II) proteins are subjected to reversible uridylylation of each monomer. In this study we used the purified proteins from Azospirillum brasilense to analyze the effect of P(II) uridylylation on the protein's ability to engage complex formation with AmtB in vitro. Our results show that partially uridylylated P(II) trimers can interact with AmtB in vitro, the implication of this finding in the regulation of nitrogen metabolism is discussed. We also report an improved expression and purification protocol for the A. brasilense AmtB protein that might be applicable to AmtB proteins from other organisms.
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Affiliation(s)
- Thiago E Rodrigues
- Department of Biochemistry and Molecular Biology, Universidade Federal do Parana, Curitiba, Brazil
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