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Cruz CS, Costa EP, Machado JA, Silva JN, Romeiro NC, Moraes J, Silva JR, Fonseca RN, Vaz IS, Logullo C, Campos E. A soluble inorganic pyrophosphatase from the cattle tick Rhipicephalus microplus capable of hydrolysing polyphosphates. Insect Mol Biol 2018; 27:260-267. [PMID: 29271528 DOI: 10.1111/imb.12369] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Polyphosphates have been found in all cell types examined to date and play diverse roles depending on the cell type. In eukaryotic organisms, polyphosphates have been investigated mainly in mammalian cells, and only a few studies have addressed arthropods. Pyrophosphatases have been shown to regulate polyphosphate metabolism. However, these studies were restricted to trypanosomatids. Here we focus on the tick Rhipicephalus microplus, a haematophagous ectoparasite that is highly harmful to cattle. We produced a recombinant R. microplus pyrophosphatase (rRmPPase) with the aim of investigating its kinetic parameters using polyphosphates as substrate. Molecular docking assays of RmPPase with polyphosphates were also carried out. The kinetic and Hill coefficient parameters indicated that rRmPPase has a greater affinity, higher catalytic efficiency and increased cooperativity for sodium phosphate glass type 15 (polyP15 ) than for sodium tripolyphosphate (polyP3 ). Through molecular docking, we found that polyP3 binds close to the Mg2+ atoms in the catalytic region of the protein, participating in their coordination network, whereas polyP15 interactions involve negatively charged phosphate groups and basic amino acid residues, such as Lys56, Arg58 and Lys193; polyP15 has a more favourable theoretical binding affinity than polyP3 , thus supporting the kinetic data. This study shows, for the first time in arthropods, a pyrophosphatase with polyphosphatase activity, suggesting its participation in polyphosphate metabolism.
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Affiliation(s)
- C S Cruz
- Laboratório Integrado de Bioquímica - Hatisaburo Masuda, UFRJ, NUPEM, São José do Barreto, Macaé, Rio de Janeiro, Brazil
| | - E P Costa
- Laboratório de Química e Função de Proteínas e Peptídeos and Unidade de Experimentação Animal - CBB - UENF, Horto, Campos dos Goytacazes, Rio de Janeiro, Brazil
| | - J A Machado
- Laboratório de Química e Função de Proteínas e Peptídeos and Unidade de Experimentação Animal - CBB - UENF, Horto, Campos dos Goytacazes, Rio de Janeiro, Brazil
| | - J N Silva
- Laboratório de Química e Função de Proteínas e Peptídeos and Unidade de Experimentação Animal - CBB - UENF, Horto, Campos dos Goytacazes, Rio de Janeiro, Brazil
| | - N C Romeiro
- Laboratório de Química e Função de Proteínas e Peptídeos and Unidade de Experimentação Animal - CBB - UENF, Horto, Campos dos Goytacazes, Rio de Janeiro, Brazil
| | - J Moraes
- Laboratório Integrado de Bioquímica - Hatisaburo Masuda, UFRJ, NUPEM, São José do Barreto, Macaé, Rio de Janeiro, Brazil
- Instituto Nacional de Ciência e Tecnologia - Entomologia Molecular, Rio de Janeiro, Brazil
| | - J R Silva
- Laboratório Integrado de Bioquímica - Hatisaburo Masuda, UFRJ, NUPEM, São José do Barreto, Macaé, Rio de Janeiro, Brazil
- Instituto Nacional de Ciência e Tecnologia - Entomologia Molecular, Rio de Janeiro, Brazil
| | - R N Fonseca
- Laboratório Integrado de Bioquímica - Hatisaburo Masuda, UFRJ, NUPEM, São José do Barreto, Macaé, Rio de Janeiro, Brazil
- Instituto Nacional de Ciência e Tecnologia - Entomologia Molecular, Rio de Janeiro, Brazil
| | - I S Vaz
- Instituto Nacional de Ciência e Tecnologia - Entomologia Molecular, Rio de Janeiro, Brazil
- Centro de Biotecnologia e Faculdade de Veterinária, UFRGS, Porto Alegre, Rio Grande do Sul, Brazil
| | - C Logullo
- Laboratório de Química e Função de Proteínas e Peptídeos and Unidade de Experimentação Animal - CBB - UENF, Horto, Campos dos Goytacazes, Rio de Janeiro, Brazil
- Instituto Nacional de Ciência e Tecnologia - Entomologia Molecular, Rio de Janeiro, Brazil
| | - E Campos
- Laboratório Integrado de Bioquímica - Hatisaburo Masuda, UFRJ, NUPEM, São José do Barreto, Macaé, Rio de Janeiro, Brazil
- Instituto Nacional de Ciência e Tecnologia - Entomologia Molecular, Rio de Janeiro, Brazil
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Machado JA, Ghizoni MF, Bertelli J, Teske GC, Teske GC, Martins DF, Mazzardo-Martins L, Cargnin-Ferreira E, Santos ARS, Piovezan AP. Stretch-induced nerve injury: a proposed technique for the study of nerve regeneration and evaluation of the influence of gabapentin on this model. Braz J Med Biol Res 2013; 46:929-935. [PMID: 24270909 PMCID: PMC3854331 DOI: 10.1590/1414-431x20132863] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2013] [Accepted: 08/20/2013] [Indexed: 11/21/2022] Open
Abstract
The rat models currently employed for studies of nerve regeneration present distinct
disadvantages. We propose a new technique of stretch-induced nerve injury, used here
to evaluate the influence of gabapentin (GBP) on nerve regeneration. Male Wistar rats
(300 g; n=36) underwent surgery and exposure of the median nerve in the right
forelimbs, either with or without nerve injury. The technique was performed using
distal and proximal clamps separated by a distance of 2 cm and a sliding distance of
3 mm. The nerve was compressed and stretched for 5 s until the bands of Fontana
disappeared. The animals were evaluated in relation to functional, biochemical and
histological parameters. Stretching of the median nerve led to complete loss of motor
function up to 12 days after the lesion (P<0.001), compared to non-injured nerves,
as assessed in the grasping test. Grasping force in the nerve-injured animals did not
return to control values up to 30 days after surgery (P<0.05). Nerve injury also
caused an increase in the time of sensory recovery, as well as in the electrical and
mechanical stimulation tests. Treatment of the animals with GBP promoted an
improvement in the morphometric analysis of median nerve cross-sections compared with
the operated vehicle group, as observed in the area of myelinated fibers or
connective tissue (P<0.001), in the density of myelinated fibers/mm2
(P<0.05) and in the degeneration fragments (P<0.01). Stretch-induced nerve
injury seems to be a simple and relevant model for evaluating nerve regeneration.
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Affiliation(s)
- J A Machado
- Programa de Mestrado em Ciências da Saúde, Universidade do Sul de Santa Catarina, Tubarão,SC, Brasil
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Simpson AJ, Reinach FC, Arruda P, Abreu FA, Acencio M, Alvarenga R, Alves LM, Araya JE, Baia GS, Baptista CS, Barros MH, Bonaccorsi ED, Bordin S, Bové JM, Briones MR, Bueno MR, Camargo AA, Camargo LE, Carraro DM, Carrer H, Colauto NB, Colombo C, Costa FF, Costa MC, Costa-Neto CM, Coutinho LL, Cristofani M, Dias-Neto E, Docena C, El-Dorry H, Facincani AP, Ferreira AJ, Ferreira VC, Ferro JA, Fraga JS, França SC, Franco MC, Frohme M, Furlan LR, Garnier M, Goldman GH, Goldman MH, Gomes SL, Gruber A, Ho PL, Hoheisel JD, Junqueira ML, Kemper EL, Kitajima JP, Krieger JE, Kuramae EE, Laigret F, Lambais MR, Leite LC, Lemos EG, Lemos MV, Lopes SA, Lopes CR, Machado JA, Machado MA, Madeira AM, Madeira HM, Marino CL, Marques MV, Martins EA, Martins EM, Matsukuma AY, Menck CF, Miracca EC, Miyaki CY, Monteriro-Vitorello CB, Moon DH, Nagai MA, Nascimento AL, Netto LE, Nhani A, Nobrega FG, Nunes LR, Oliveira MA, de Oliveira MC, de Oliveira RC, Palmieri DA, Paris A, Peixoto BR, Pereira GA, Pereira HA, Pesquero JB, Quaggio RB, Roberto PG, Rodrigues V, de M Rosa AJ, de Rosa VE, de Sá RG, Santelli RV, Sawasaki HE, da Silva AC, da Silva AM, da Silva FR, da Silva WA, da Silveira JF, Silvestri ML, Siqueira WJ, de Souza AA, de Souza AP, Terenzi MF, Truffi D, Tsai SM, Tsuhako MH, Vallada H, Van Sluys MA, Verjovski-Almeida S, Vettore AL, Zago MA, Zatz M, Meidanis J, Setubal JC. The genome sequence of the plant pathogen Xylella fastidiosa. The Xylella fastidiosa Consortium of the Organization for Nucleotide Sequencing and Analysis. Nature 2000; 406:151-9. [PMID: 10910347 DOI: 10.1038/35018003] [Citation(s) in RCA: 538] [Impact Index Per Article: 22.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Xylella fastidiosa is a fastidious, xylem-limited bacterium that causes a range of economically important plant diseases. Here we report the complete genome sequence of X. fastidiosa clone 9a5c, which causes citrus variegated chlorosis--a serious disease of orange trees. The genome comprises a 52.7% GC-rich 2,679,305-base-pair (bp) circular chromosome and two plasmids of 51,158 bp and 1,285 bp. We can assign putative functions to 47% of the 2,904 predicted coding regions. Efficient metabolic functions are predicted, with sugars as the principal energy and carbon source, supporting existence in the nutrient-poor xylem sap. The mechanisms associated with pathogenicity and virulence involve toxins, antibiotics and ion sequestration systems, as well as bacterium-bacterium and bacterium-host interactions mediated by a range of proteins. Orthologues of some of these proteins have only been identified in animal and human pathogens; their presence in X. fastidiosa indicates that the molecular basis for bacterial pathogenicity is both conserved and independent of host. At least 83 genes are bacteriophage-derived and include virulence-associated genes from other bacteria, providing direct evidence of phage-mediated horizontal gene transfer.
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Affiliation(s)
- A J Simpson
- Instituto Ludwig de Pesquisa sobre o Câncer, São Paulo, SP, Brazil
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Cardoso MI, Meijer AH, Rueb S, Machado JA, Memelink J, Hoge JH. A promoter region that controls basal and elicitor-inducible expression levels of the NADPH:cytochrome P450 reductase gene (Cpr) from Catharanthus roseus binds nuclear factor GT-1. Mol Gen Genet 1997; 256:674-81. [PMID: 9435792 DOI: 10.1007/pl00008617] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
NADPH:cytochrome P450 reductase (CPR) is essential for the activation of cytochrome P450 enzymes, which are involved in a wide variety of metabolic pathways in plants, including those related to defence responses. In the subtropical plant Catharanthus roseus several cytochrome P450 enzymes operate in the biosynthesis of defence-related terpenoid indole alkaloids (TIAs). In agreement with the importance of CPR in defence, Cpr mRNA levels in C. roseus were found to be enhanced by fungal elicitor preparations that also induce TIA biosynthesis and P450 gene expression. Here we describe the isolation of a C. roseus genomic DNA clone covering the 5' part of the Cpr gene and 1.6-kb of upstream sequences. Mapping of the transcription start site showed the untranslated leader sequence is approximately 280 bp long. To study the control of gene expression by the Cpr promoter, transcriptional fusions between Cpr promoter fragments and the gusA reporter gene were generated and their expression was analyzed in stably transformed tobacco plants. The Cpr promoter fragment extending from -1510 to -8, with respect to the ATG start codon, conferred basal and elicitor-inducible expression on the gusA reporter gene, strongly indicating that the Cpr gene of C. roseus is indeed controlled by this promoter region. Progressive deletion from the 5' end of the promoter to position -632 had little effect on gusA expression. However, deletion to position -366 resulted in a complete loss of basal activity and largely eliminated elicitor-induced expression, indicating that the region from -632 to -366 contains the main transcription-enhancing cis-regulatory sequences. Electrophoretic mobility shift assays with tobacco nuclear extracts showed that binding sites for nuclear factor GT-1 are redundant in the Cpr promoter, but absent from the downstream part of the leader sequence. The presence of strong GT-1 binding sites in the main enhancer region (-632 to -366), is suggestive of a functional role for this factor in basal expression and elicitor responsiveness of the Cpr promoter.
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Affiliation(s)
- M I Cardoso
- Institute of Molecular Plant Sciences, Leiden University, Clusius Laboratory, The Netherlands
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Mendonça EF, Goulart EM, Machado JA. [Reliability of the declaration of underlying cause of infant deaths in the metropolitan region of southeastern Brazil]. Rev Saude Publica 1994; 28:385-91. [PMID: 7660042 DOI: 10.1590/s0034-89101994000500013] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
The quality of official information on underlying causes of infant deaths was studied on the basis of data collected for a population-based study of the surveillance of infant mortality in the metropolitan region of Belo Horizonte, Brazil in 1989. The survey included the analysis of a sample of infant deaths carried out by comparing the underlying causes of death as coded on death certificates to those recorded by a group of doctors who abstracted information from hospital records. We verified that 11.7% of neonatal deaths did not have the underlying cause of death confirmed by the investigation (kappa = 0.61), and neither did 44.0% of post-neonatal deaths (kappa = 0.47). It is believed that this major disagreement among post-neonatal deaths is due to the close correlation observed among the major causes of death within this group (pneumonia, diarrhoea and malnutrition). For example, associated malnutrition was observed in 76.9% of those cases in which diarrhoea was coded as the underlying cause of death. It was concluded that the quality of the death certificates is not satisfactory. However, the composition of the main groups of causes presented no significant alteration after investigation and may be used in public health surveillance, especially if we regard pneumonia, diarrhoea and malnutrition as a group with the same determinants. Unfortunately, this group still accounts for a great number of otherwise avoidable deaths in Brazil.
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Affiliation(s)
- E F Mendonça
- Departamento de Medicina Preventiva e Social da Faculdade de Medicina da Universidade Federal de Minas Gerais e Escola de Saúde de Minas Gerais/FUNED, Belo Horizonte, MG, Brasil
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Machado JA. [Levamisole - a new treatment for two old problems: recurrent aphthous ulceration and recurrent labial herpes simplex]. Rev Assoc Paul Cir Dent 1981; 35:20-6. [PMID: 6943614] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Machado JA, Nader S, Rangel AM. [Up-date on the treatment of oral herpes]. Rev Assoc Paul Cir Dent 1981; 35:4-10. [PMID: 7022575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Machado JA. [Clinical evaluation of the use of levamisole in treatment of recurrent labial herpes simplex]. Ars Curandi Odontol 1979; 6:32-5. [PMID: 296686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Camargo LA, Saad WA, Machado JA, Rodrigues GN, Saad WA. Effects of noradrenergic stimulation of the medial and lateral hypothalamus on cardiovascular responses. Pharmacol Res Commun 1979; 11:147-56. [PMID: 441100 DOI: 10.1016/s0031-6989(79)80068-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Machado JA, Silva EN, Katz N, Rocha RS, Gazzinelli G. Peripheral lymphocytes in patients with intestinal schistosomiasis mansoni. Trans R Soc Trop Med Hyg 1978; 72:441. [PMID: 705850 DOI: 10.1016/0035-9203(78)90147-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
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Machado JA, Antunes LJ, Silva EN. ["E" rosette formation in "active" T lymphocytes: phenomenon modulated by intracellular level of cyclic AMP and GMP (author's transl)]. Rev Bras Pesqui Med Biol 1977; 10:241-6. [PMID: 198854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The rosette formation envolving the binding of sheep red blood cells (SRBC) with active T lymphocytes was activated when the lymphocytes were incubated with levamisole, acetylcholine or carbamylcholine. Similar activation was seen when to the incubation medium was added substances of glucose metabolism (lactate, fumarate or succinate) or triphosphate de adenosina--ATP. The lymphocytes incubation with aminophyline, isoproterenol or 2-4-dinitrofenol--DNP--inhibited the rosette formation. The inhibition promoted by aminophyline was reversed by levamisole, acetylcholine or carbamylcholine, but not when lactate or ATP was used. When the rosette formation inhibition was caused by DNP, the reversion was only possible by ATP and no affect occurred if guanil cyclase activators were added to the incubation medium.
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Garrafa IR, De Salles FA, Almeida VP, Machado JA. [Health promotion in oral cancer]. Ars Curandi Odontol 1976; 3:27-34. [PMID: 801437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Machado JA, Acetoze PA, Camargo DDA, Ferreira BA. [Study of the incidence of extraction of permanent teeth in the area of Araraquara (SP)]. Rev Fac Farm Odontol Araraquara 1972; 6:65-70. [PMID: 4513809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Machado JA. [Embolism caused by amniotic fluid. Review and presentation of a case during general anesthesia for cesarean section delivery]. Braz J Anesthesiol 1970; 20:577-82. [PMID: 5502929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
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