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Kamoshita M, Kumar R, Anteghini M, Kunze M, Islinger M, Martins dos Santos V, Schrader M. Insights Into the Peroxisomal Protein Inventory of Zebrafish. Front Physiol 2022; 13:822509. [PMID: 35295584 PMCID: PMC8919083 DOI: 10.3389/fphys.2022.822509] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Accepted: 02/07/2022] [Indexed: 12/19/2022] Open
Abstract
Peroxisomes are ubiquitous, oxidative subcellular organelles with important functions in cellular lipid metabolism and redox homeostasis. Loss of peroxisomal functions causes severe disorders with developmental and neurological abnormalities. Zebrafish are emerging as an attractive vertebrate model to study peroxisomal disorders as well as cellular lipid metabolism. Here, we combined bioinformatics analyses with molecular cell biology and reveal the first comprehensive inventory of Danio rerio peroxisomal proteins, which we systematically compared with those of human peroxisomes. Through bioinformatics analysis of all PTS1-carrying proteins, we demonstrate that D. rerio lacks two well-known mammalian peroxisomal proteins (BAAT and ZADH2/PTGR3), but possesses a putative peroxisomal malate synthase (Mlsl) and verified differences in the presence of purine degrading enzymes. Furthermore, we revealed novel candidate peroxisomal proteins in D. rerio, whose function and localisation is discussed. Our findings confirm the suitability of zebrafish as a vertebrate model for peroxisome research and open possibilities for the study of novel peroxisomal candidate proteins in zebrafish and humans.
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Affiliation(s)
- Maki Kamoshita
- College of Life and Environmental Sciences, Biosciences, University of Exeter, Exeter, United Kingdom
| | - Rechal Kumar
- College of Life and Environmental Sciences, Biosciences, University of Exeter, Exeter, United Kingdom
| | - Marco Anteghini
- LifeGlimmer GmbH, Berlin, Germany
- Systems and Synthetic Biology, Wageningen University & Research, Wageningen, Netherlands
| | - Markus Kunze
- Center for Brain Research, Medical University of Vienna, Vienna, Austria
| | - Markus Islinger
- Institute of Neuroanatomy, Mannheim Center for Translational Neuroscience, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Vítor Martins dos Santos
- LifeGlimmer GmbH, Berlin, Germany
- Systems and Synthetic Biology, Wageningen University & Research, Wageningen, Netherlands
| | - Michael Schrader
- College of Life and Environmental Sciences, Biosciences, University of Exeter, Exeter, United Kingdom
- *Correspondence: Michael Schrader,
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Bucking C, LeMoine CMR, Craig PM, Walsh PJ. Nitrogen metabolism of the intestine during digestion in a teleost fish, the plainfin midshipman (Porichthys notatus). ACTA ACUST UNITED AC 2013; 216:2821-32. [PMID: 23619402 DOI: 10.1242/jeb.081562] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Digestion affects nitrogen metabolism in fish, as both exogenous and endogenous proteins and amino acids are catabolized, liberating ammonia in the process. Here we present a model of local detoxification of ammonia by the intestinal tissue of the plainfin midshipman (Porichthys notatus) during digestion, resulting in an increase in urea excretion of gastrointestinal origin. Corroborating evidence indicated whole-animal ammonia and urea excretion increased following feeding, and ammonia levels within the lumen of the midshipman intestine increased to high levels (1.8±0.4 μmol N g(-1)). We propose that this ammonia entered the enterocytes and was detoxified to urea via the ornithine-urea cycle (O-UC) enzymes, as evidenced by a 1.5- to 2.9-fold post-prandial increase in glutamine synthetase activity (0.14±0.05 and 0.28±0.02 μmol min(-1) g(-1) versus 0.41±0.03 μmol min(-1) g(-1)) and an 8.7-fold increase in carbamoyl phosphate synthetase III activity (0.3±1.2 versus 2.6±0.4 nmol min(-1) g(-1)). Furthermore, digestion increased urea production by isolated gastrointestinal tissue 1.7-fold, supporting our hypothesis that intestinal tissue synthesizes urea in response to feeding. We further propose that the intestinal urea may have been excreted into the intestinal lumen via an apical urea transporter as visualized using immunohistochemistry. A portion of the urea was then excreted to the environment along with the feces, resulting in the observed increase in urea excretion, while another portion may have been used by intestinal ureolytic bacteria. Overall, we propose that P. notatus produces urea within the enterocytes via a functional O-UC, which is then excreted into the intestinal lumen. Our model of intestinal nitrogen metabolism does not appear to be universal as we were unab le to activate the O-UC in the intestine of fed rainbow trout. However, literature values suggest that multiple fish species could follow this model.
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Affiliation(s)
- Carol Bucking
- Department of Biology, University of Ottawa, ON, Canada and Bamfield Marine Science Center, Bamfield, BC, Canada.
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3
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Erden PE, Kılıç E. A review of enzymatic uric acid biosensors based on amperometric detection. Talanta 2013; 107:312-23. [DOI: 10.1016/j.talanta.2013.01.043] [Citation(s) in RCA: 108] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2012] [Revised: 01/14/2013] [Accepted: 01/16/2013] [Indexed: 12/13/2022]
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4
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Abstract
Bacterial allantoinase (ALLase; EC 3.5.2.5), which catalyzes the conversion of allantoin into allantoate, possesses a binuclear metal center in which two metal ions are bridged by a posttranslationally carboxylated lysine. Here, we characterized ALLase from Escherichia coli BL21. Purified recombinant ALLase exhibited no activity but could be activated when preincubating with some metal ions before analyzing its activity, and was in the order: Mn(2+)- ≫ Co(2+)- > Zn(2+)- > Ni(2+)- > Cd(2+)- ~Mg(2+)-activated enzyme; however, activity of ALLase (Mn(2+)-activated form) was also significantly inhibited with 5 mM Co(2+), Zn(2+), and Cd(2+) ions. Activity of Mn(2+)-activated ALLase was increased by adding the reducing agent dithiothreitol (DTT), but was decreased by treating with the sulfhydryl modifying reagent N-ethylmaleimide (NEM). Inhibition of Mn(2+)-activated ALLase by chelator 8-hydroxy-5-quinolinesulfonic acid (8-HQSA), but not EDTA, was pH-dependent. Analysis of purified ALLase by gel filtration chromatography revealed a mixture of monomers, dimers, and tetramers. Substituting the putative metal binding residues His59, His61, Lys146, His186, His242, and Asp315 with Ala completely abolished the activity of ALLase, even preincubating with Mn(2+) ions. On the basis of these results, as well as the pH-activity profile, the reaction mechanism of ALLase is discussed and compared with those of other cyclic amidohydrolases.
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Affiliation(s)
- Ya-Yeh Ho
- Department of Biomedical Sciences, Chung Shan Medical University, Taichung City, Taiwan
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5
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Islinger M, Cardoso MJR, Schrader M. Be different--the diversity of peroxisomes in the animal kingdom. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2010; 1803:881-97. [PMID: 20347886 DOI: 10.1016/j.bbamcr.2010.03.013] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2010] [Revised: 03/15/2010] [Accepted: 03/18/2010] [Indexed: 10/19/2022]
Abstract
Peroxisomes represent so-called "multipurpose organelles" as they contribute to various anabolic as well as catabolic pathways. Thus, with respect to the physiological specialization of an individual organ or animal species, peroxisomes exhibit a functional diversity, which is documented by significant variations in their proteome. These differences are usually regarded as an adaptational response to the nutritional and environmental life conditions of a specific organism. Thus, human peroxisomes can be regarded as an in part physiologically unique organellar entity fulfilling metabolic functions that differ from our animal model systems. In line with this, a profound understanding on how peroxisomes acquired functional heterogeneity in terms of an evolutionary and mechanistic background is required. This review summarizes our current knowledge on the heterogeneity of peroxisomal physiology, providing insights into the genetic and cell biological mechanisms, which lead to the differential localization or expression of peroxisomal proteins and further gives an overview on peroxisomal biochemical pathways, which are specialized in different animal species and organs. Moreover, it addresses the impact of proteome studies on our understanding of differential peroxisome function describing the utility of mass spectrometry and computer-assisted algorithms to identify peroxisomal target sequences for the detection of new organ- or species-specific peroxisomal proteins.
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Affiliation(s)
- M Islinger
- Department of Anatomy and Cell Biology, Ruprecht-Karls University, 69120 Heidelberg, Germany
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6
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Purification and characterization of caprine kidney uricase, possessing novel kinetic and thermodynamic properties. World J Microbiol Biotechnol 2006. [DOI: 10.1007/s11274-005-9034-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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7
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Wang Y, Zhang S, Liu Z, Li H, Wang L. Amphioxus allantoicase: Molecular cloning, expression and enzymatic activity. Comp Biochem Physiol B Biochem Mol Biol 2005; 141:237-43. [PMID: 15886037 DOI: 10.1016/j.cbpc.2005.03.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2004] [Revised: 03/24/2005] [Accepted: 03/30/2005] [Indexed: 11/24/2022]
Abstract
Allantoicase, one of the purine metabolism enzymes, is progressively truncated during the chordate evolution, yet it is unknown when its activity became phylogenetically extinct. In this study, a cDNA encoding allantoicase was isolated from the gut cDNA library of amphioxus Branchiostoma belcheri tsingtauense. It is 2441 bp long, and contains an open reading frame encoding a protein of 392 amino acid residues. RT-PCR analysis showed that amphioxus allantoicase was strongly expressed in the hepatic caecum, and weakly expressed in other tissues including hind-gut, gill, muscle, notochord, testis and ovary. The parallel experiment was performed measuring the allantoicase activity in the same tissues revealed that its activity was high in the hepatic caecum, but low or undetectable in other tissues examined. These suggest that allantoicase remains in action in the primitive chordate amphioxus.
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Affiliation(s)
- Yongjun Wang
- Department of Marine Biology, Ocean University of China, 5 Yushan Road, Qingdao 266003, PR China
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8
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Gouillou-Coustans MF, Fournier V, Métailler R, Vachot C, Desbruyères E, Huelvan C, Moriceau J, Le Delliou H, Kaushik SJ. Dietary arginine degradation is a major pathway in ureagenesis in juvenile turbot (Psetta maxima). Comp Biochem Physiol A Mol Integr Physiol 2002; 132:305-19. [PMID: 12020647 DOI: 10.1016/s1095-6433(02)00032-6] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Recent studies indicate that urea excretion is responsive to protein intake and that turbot, Psetta maxima, appear to differ from other species by their urea excretion pattern and levels. This study was undertaken to evaluate the influence of dietary nitrogen and arginine on ureagenesis and excretion in turbot. Juvenile turbot (29 g) were fed semi-purified diets containing graded levels of nitrogen (0-8% dry matter) and arginine (0-3% dry matter) for 6 weeks. Growth data showed that turbot have high dietary nitrogen (123 mg/kg metabolic body weight/day) and very low dietary arginine (9.3 mg/kg metabolic body weight/day) requirements for maintenance. Requirements for unit body protein accretion were 0.31 g and 0.15 g for nitrogen and arginine respectively. Post-prandial plasma urea levels and urea excretion rates showed that urea production was significantly (P<0.05) influenced by dietary arginine levels. While hepatic arginase (EC 3.5.3.1) activity increased significantly (P<0.05) with increasing dietary arginine levels, activities of other enzymes of the ornithine urea cycle were very low. Our data strongly suggest that the ornithine urea cycle is not active in the turbot liver and that dietary arginine degradation is a major pathway of ureagenesis in turbot.
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Affiliation(s)
- M F Gouillou-Coustans
- Laboratoire de Nutrition des Poissons, Unité mixte INRA-IFREMER, IFREMER, Centre de Brest, B.P 70. 29280, Plouzané, France
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9
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Vigetti D, Monetti C, Prati M, Gornati R, Bernardini G. Genomic organization and chromosome localization of the murine and human allantoicase gene. Gene 2002; 289:13-7. [PMID: 12036579 DOI: 10.1016/s0378-1119(02)00541-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Allantoicase is one of the enzymes involved in uricolysis. The enzymes of this catabolic pathway (i.e. allantoinase, allantoicase, ureidoglycolate lyase and urease) were lost during vertebrate evolution and the causes for this loss are still unclear. In mammals, as well as in birds and reptiles, the activity of allantoicase is absent; notwithstanding, we recently cloned human and mouse cDNA sequences with high similarity with previously characterized allantoicases. In the present paper, we report the genomic organization of the allantoicase gene in mouse and in man. Both genes are constituted by 11 exons that appear to be very conserved; introns are more variable in length while maintain the same phase but for intron 4. We have also detected a second transcript of the human allantoicase gene in which exon 1 is absent. Moreover, the mouse gene maps in chromosome 12 at 13.0 cM from the centromere.
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Affiliation(s)
- Davide Vigetti
- Dipartimento di Biologia Strutturale e Funzionale, Università degli Studi dell'Insubria, Via J.H. Dunant 3, I-21100 Varese, Italy
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10
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Vigetti D, Pollegioni L, Monetti C, Prati M, Bernardini G, Gornati R. Property comparison of recombinant amphibian and mammalian allantoicases. FEBS Lett 2002; 512:323-8. [PMID: 11852104 DOI: 10.1016/s0014-5793(02)02264-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Allantoicase is an enzyme involved in uric acid degradation. Although it is commonly accepted that allantoicase is lost in mammals, birds and reptiles, we have recently identified its transcripts in mice and humans. The mouse mRNA seems capable of encoding a functional allantoicase, therefore we expressed the Xenopus and mouse allantoicases (MAlc and XAlc, respectively) in Escherichia coli and characterized the recombinant enzymes. The two recombinant allantoicases show a similar temperature and pH stability but, although XAlc and MAlc share a 54% amino acid identity, they differ in sensitivity to bivalent cations, in substrate affinity and in the level of expression in tissues (as revealed by means of Western blot analysis). We propose that the loss of allantoicase activity in mouse is due to a low substrate affinity and to a reduced expression level of the enzyme.
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Affiliation(s)
- Davide Vigetti
- Dipartimento di Biologia Strutturale e Funzionale, Universitá degli Studi dell'Insubria, Via J.H. Dunant 3, 21100, Varese, Italy
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11
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Pomati F, Manarolla G, Rossi O, Vigetti D, Rossetti C. The purine degradation pathway: possible role in paralytic shellfish toxin metabolism in the cyanobacterium Planktothrix sp. FP1. ENVIRONMENT INTERNATIONAL 2001; 27:463-470. [PMID: 11800428 DOI: 10.1016/s0160-4120(01)00101-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The paralytic shellfish toxins (PSTs) are potent neurotoxic alkaloids and their major biological effect is due to the blockage of voltage-gated sodium channels in excitable cells. They have been recognised as an important health risk for humans, animals, and ecosystems worldwide. The metabolic pathways that lead to the production and the degradation of these toxic metabolites are still unknown. In this study, we investigated the possible link between PST accumulation and the activation of the metabolism that leads to purine degradation in the filamentous freshwater cyanobacterium Planktothrix sp. FP1. The purine catabolic pathway is related to the nitrogen microcycle in water environments, in which cyanobacteria use traces of purines and ureides as a nitrogen source for growth. Thus, the activity of allantoicase, a key inducible enzyme of this metabolism, was used as tool for assaying the activation of the purine degradation pathway. The enzyme and the pathway were induced by allantoic acid, the direct substrate of allantoicase, as well as by adenine and, to a lower degree, by urea, one of the main products of purine catabolism. Crude cell extract of Escherichia coli was also employed and showed the best induction of allantoicase activity. In culture, Planktothrix sp. FP1 showed a differential accumulation of PST in consequence of the induction with different substrates. The cyanobacterial culture induced with allantoic acid accumulated 61.7% more toxins in comparison with the control. On the other hand, the cultures induced with adenine, urea, and the E. coli extract showed low PST accumulation, respectively, 1%, 38%, and 5% of the total toxins content detected in the noninduced culture. A degradation pathway for the PSTs can be hypothesised: as suggested for purine alkaloids in higher plants, saxitoxin (STX) and derivatives may also be converted into xanthine, urea, and further to CO2 and NH4+ or recycled in the primary metabolism through the purine degradation pathway.
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Affiliation(s)
- F Pomati
- DBSF, University of Insubria, Varese, Italy.
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12
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Metabolism of Aromatic Compounds and Nucleic Acid Bases. Biochemistry 2001. [DOI: 10.1016/b978-012492543-4/50028-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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13
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Anderson PM. Urea and glutamine synthesis: Environmental influences on nitrogen excretion. FISH PHYSIOLOGY 2001. [DOI: 10.1016/s1546-5098(01)20008-9] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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14
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Evolutionary considerations of nitrogen metabolism and excretion. ACTA ACUST UNITED AC 2001. [DOI: 10.1016/s1546-5098(01)20002-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
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Abstract
To examine the transition to ureogenesis, the gobiid fish Mugilogobius abei was immersed in 2 mmol l(−)(1) NH(4)HCO(3) or a (15)N-labelled ammonia solution [1 mmol l(−)(1) ((15)NH(4))(2)SO(4), pH 8.0] for 4–8 days. When exposed to 2 mmol l(−)(1) NH(4)HCO(3) or (15)N-labelled ammonia solution for 4 days, the rate of urea excretion increased to seven times that of the control (in 20 % synthetic sea water) and remained at this level for 4 days. The proportion of nitrogen excreted as urea reached 62 % of total nitrogen excretion (ammonia-N + urea-N). (15)N-enrichment of the amide-N in glutamine in the tissues of fish exposed to (15)N-labelled ammonia was virtually the same as that of ammonia-N: i.e. approximately twice that of urea-N in the excreta and the tissues. Glutamine contents and glutamine synthetase activities in the liver and muscle increased greatly following exposure to ammonia. Urea and citrulline contents in the muscle and whole body of the exposed fish increased significantly, whereas uric acid contents remained unchanged. Carbamoyl phosphate synthetase III (CPSase III) mRNA expression and CPSase III activity were detected in the muscle, skin and gill, but levels were negligible in the liver. Furthermore, all other ornithine-urea cycle (O-UC) enzymes were also detected in muscle, skin and gill. Thus, M. abei clearly shows the transition from ammoniotely to ureotely under ammonia-loading condition and is able to produce urea mainly via the O-UC operating in multiple non-hepatic tissues as a means for ammonia detoxification.
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Affiliation(s)
- K Iwata
- Biological Laboratory, Faculty of Education, Wakayama University, Wakayama 640-8510, Japan.
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Vigetti D, Monetti C, Acquati F, Taramelli R, Bernardini G. Human allantoicase gene: cDNA cloning, genomic organization and chromosome localization. Gene 2000; 256:253-60. [PMID: 11054555 DOI: 10.1016/s0378-1119(00)00342-5] [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: 11/26/2022]
Abstract
Uric-acid-degrading enzymes (uricase, allantoinase, allantoicase, ureidoglycolate lyase and urease) were lost during vertebrate evolution and the causes for this loss are still unclear. We have recently cloned the first vertebrate allantoicase cDNA from the amphibian Xenopus laevis. Surprisingly, we have found some mammalian expressed sequence tags (ESTs) that show high similarity with Xenopus allantoicase cDNA. From a human fetal spleen cDNA library and adult kidney EST clone, we have obtained a 1790 nucleotide long cDNA. The 3' end of this sequence reveals a substantial high identity with the corresponding portion of Xenopus allantoicase cDNA. In contrast, at the 5' end the human sequence diverges from that of Xenopus; since no continuous open reading frame can be found in this region, the hypothetical human protein appears truncated at its N-terminus. We proposed that such a transcript could be due to an incorrect splicing mechanism that introduces an intron portion at the 5' end of human cDNA. Allantoicase cDNA is expressed in adult testis, prostate, kidney and fetal spleen. By comparison with available genomic sequences deposited in database, we have determined that the human allantoicase gene consists of five exons and spans 8kb. We have also mapped the gene in chromosome 2.
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Affiliation(s)
- D Vigetti
- Dipartimento di Biologia Strutturale e Funzionale, Università degli Studi dell'Insubria, Via J. H. Dunant 3, I-21100, Varese, Italy
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18
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Vigetti D, Monetti C, Pollegioni L, Taramelli R, Bernardini G. Xenopus allantoicase: molecular cloning, enzymatic activity and developmental expression. Arch Biochem Biophys 2000; 379:90-6. [PMID: 10864446 DOI: 10.1006/abbi.2000.1863] [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
Allantoicase is one of the enzymes of the purine degradation pathway and, interestingly, it appears to be lost, together with uricase and allantoinase, during mammalian evolution. Only allantoicases from the ascomycetes S. pombe, S. cerevisiae, and N. crassa have already been cloned, although the activity has been reported also in fishes and amphibians. By screening a cDNA expression library of Xenopus liver, we have cloned a 1491-bp-length cDNA coding for a 389 amino acid protein that shows an high similarity with the enzyme allantoicase. We have found that allantoicase mRNA is abundantly expressed in kidney and liver, but at much lower level is also present in brain, testis, intestine, and lung. We have detected enzymatic activity in crude extract from kidney, liver, and lung; we have also determined kinetic parameters (K(m) = 8.44 mM, V(max) = 6. 94 micromol min(-1) per mg protein) in kidney. During embryo development, we have detected allantoicase transcript and activity starting from 1 and 5 days after fertilization, respectively.
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Affiliation(s)
- D Vigetti
- Dipartimento di Biologia Strutturale e Funzionale, Università degli Studi dell'Insubria, Via J. H. Dunant 3, Varese, I-21100, Italy
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Cancio I, Völkl A, Beier K, Fahimi HD, Cajaraville MP. Immunocytochemical localization of a urate oxidase immunoreactive protein in the plasma membranes and membranes of the secretory/endocytic compartments of digestive gland cells of the mussel Mytilus galloprovincialis. Eur J Cell Biol 2000; 79:35-40. [PMID: 10711424 DOI: 10.1078/s0171-9335(04)70005-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
The subcellular compartmentalization of urate oxidase (UOX) in the digestive glands of mussels, Mytilus galloprovincialis Lmk, was studied by means of immunoblotting and immunocytochemistry, using an antibody raised in rabbit against rat liver UOX. Western blot analysis of subcellular fractions revealed an immunoreactive polypeptide with a molecular weight similar to the corresponding mammalian hepatic protein. This crossreactive polypeptide of 32 kDa was particle-bound yet not peroxisome-associated. In paraffin sections the antiserum specifically labeled the plasma membrane of the digestive gland epithelial cells and discrete regions within the perinuclear and apical portions of the digestive tubules and duct cells. By electron microscopy gold particles representing antigenic sites were found on the microvilli and the lateral plasma membrane as well as the membranes of the secretory/ endocytic compartments, that is, the Golgi complex, secretory and some endocytic vesicle membranes. Since the peroxisomal UOX-antibody exhibits a comparable immunoreactivity towards a urate-transporter channel protein in rat kidney proximal tubules and has been used for its molecular cloning (Leal-Pinto et al., 1997, J. Biol. Chem. 272, 617-625), we suggest that the membrane protein identified in mussel digestive glands could represent a homologous urate-transporter protein.
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Affiliation(s)
- I Cancio
- Biologia Zelularra Atala, Zoologia eta Animali Zelulen Dinamika Saila, Euskal Herriko Unibertsitatea/Universidad del País Vasco, Bilbo/Basque Country, Spain
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20
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Wilkie MP, Wang Y, Walsh PJ, Youson JH. Nitrogenous waste excretion by the larvae of a phylogenetically ancient vertebrate: the sea lamprey (Petromyzon marinus). CAN J ZOOL 1999. [DOI: 10.1139/z99-038] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Larval sea lampreys (Petromyzon marinus) (ammocoetes) excreted significant quantities of urea, which composed 15-20% of the total nitrogenous waste excreted. Compared with teleosts of similar size, ammonia and urea excretion rates (JAmm and JUrea, respectively) in ammocoetes were relatively low, reflecting the low metabolic rate of these burrow-dwelling suspension feeders. Analyses of liver enzymes indicated that ammocoetes had all the enzymes necessary to produce urea via uricolysis, but not those of the ornithine-urea cycle (OUC). Further, exposure to 2 mmol·L-1 total ammonia for 5 d was accompanied by a 3-fold elevation of JUrea, but did not lead to greater OUC activity. Internal ammonia levels increased markedly, however, exceeding 2000 µmol·L-1 in plasma and 5000 µmol·L-1 in muscle after the 5-d exposure period. This high resistance to internal ammonia accumulation was related to the very high glutamine synthetase activities measured in ammocoete brains. The excretion and production of urea by ammocoetes demonstrates for the first time that agnathans are capable of producing physiologically relevant amounts of urea. Given the ancient origins and conserved evolution of lampreys, these observations also suggest that at least some of the early jawless vertebrates were able to produce and excrete urea.
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Saha N, Ratha B. Ureogenesis in Indian air-breathing teleosts: adaptation to environmental constraints. Comp Biochem Physiol A Mol Integr Physiol 1998. [DOI: 10.1016/s1095-6433(98)00026-9] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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Abstract
Teleosts appear to have retained the genes for the urea cycle enzymes. A few species express the full complement of enzymes and are ureotelic (e.g., Lake Magadi tilapia) or ammoniotelic (e.g., largemouth bass), whereas most species have low or non-detectable enzyme activities in liver tissue and excrete little urea (e.g., adult rainbow trout). It was surprising, therefore, to find the expression of four urea cycle enzymes during early life stages of rainbow trout. The urea cycle may play a role in ammonia detoxification during a critical time of development. Exposure to alkaline water (pH 9.0-9.5) or NH4Cl (0.2 mmol/l) increased urea excretion by several-fold in trout embryos, free embryos and alevin. Urea transport is either by passive simple diffusion or via carried-mediated transport proteins. Molecular studies have revealed that a specialised urea transport protein is present in kidney tissue of elasmobranchs, similar to the facilitated urea transporter found in the mammalian inner medulla of the kidney.
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Affiliation(s)
- P A Wright
- Department of Zoology, University of Guelph, Ontario, Canada.
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Lawrence ML, Cooper RK, Thune RL. Attenuation, persistence, and vaccine potential of an Edwardsiella ictaluri purA mutant. Infect Immun 1997; 65:4642-51. [PMID: 9353045 PMCID: PMC175666 DOI: 10.1128/iai.65.11.4642-4651.1997] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
In this study, an adenine-auxotrophic strain of Edwardsiella ictaluri was constructed and its virulence, tissue persistence, and vaccine efficacy were evaluated. A clone containing the purA gene was isolated from an E. ictaluri genomic library, sequenced, and shown to have an overall sequence identity of 79.3% at the nucleotide level and 85.7% at the amino acid level with the Escherichia coli purA gene. The cloned E. ictaluri purA gene was mutated by deleting a 598-bp segment of the gene and inserting the kanamycin resistance gene from Tn903 into the gap. The delta purA::Km(r) gene was subcloned into the suicide plasmid pGP704, and the resulting plasmid was used to deliver the modified gene into a virulent strain of E. ictaluri by conjugation. Homologous recombination replaced the chromosomal purA gene with the mutated gene to create an adenine-auxotrophic strain (LSU-E2). Compared to wild-type E. ictaluri, LSU-E2 was highly attenuated by the injection, immersion, and oral routes of exposure. By the injection route, LSU-E2 had a 50% lethal dose (LD50) that was greater than 5 logs10 higher than the LD50 for wild-type E. ictaluri. In a tissue persistence study, LSU-E2 was able to invade channel catfish by the immersion route and persist in internal organs for at least 48 h. Channel catfish that were vaccinated with a single immersion dose of LSU-E2 had mortality significantly lower (P < 0.01) following a wild-type E. ictaluri challenge than that of nonvaccinated fish.
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Affiliation(s)
- M L Lawrence
- Department of Veterinary Microbiology, School of Veterinary Medicine, Louisiana State University, Baton Rouge 70803, USA
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Usuda N, Hanai T, Nagata T. Immunogold studies on peroxisomes: review of the localization of specific proteins in vertebrate peroxisomes. Microsc Res Tech 1995; 31:79-92. [PMID: 7626801 DOI: 10.1002/jemt.1070310107] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Peroxisomes, since their discovery as microbodies, have been studied mostly independently by electron microscopists and biochemists. The fine structure has been studied by electron microscopy, and the compositional enzymes and proteins by protein biochemistry. Electron microscopic histochemistry has been used to try to clarify the relationship between the fine structure and its constituents. The immunogold technique, a combination of electron microscopy and protein biochemistry, for the first time resolved this problem due to the high sensitivity and resolution power of the staining and the high reliability of the technique. The present paper reviews the way in which the immunogold techniques, especially the protein A-gold technique, revealed the localization of various enzymes or proteins in peroxisomes or peroxisomal subcompartments, and discusses why this technique should be employed in peroxisome research.
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Affiliation(s)
- N Usuda
- Department of Anatomy and Cell Biology, Shinshu University School of Medicine, Matsumoto, Japan
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26
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Bleisch S, Sillero MA, Torrecilla A, Sillero A. Uric acid synthesis by rat liver supernatants from purine bases, nucleosides and nucleotides. Effect of allopurinol. Cell Biochem Funct 1994; 12:237-45. [PMID: 7834812 DOI: 10.1002/cbf.290120403] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The synthesis of uric acid from purine bases, nucleosides and nucleotides has been measured in reaction mixtures containing rat liver supernatant and each one of the following compounds at 1 mM concentration (except xanthine, 0.5 mM and guanosine and guanine, 0.1 mM). The rates of the reaction, expressed as nanomoles of uric acid synthesized g-1 of wet liver min-1 were: ATP, 10; ADP, 37; AMP, 62; adenosine, 108; adenine 6; adenylosuccinate, 9; IMP 32; inosine, 112; hypoxanthine, 50; GTP, 19; GDP, 19; GMP, 27; guanosine, 34; guanine, 72; XMP, 10; xanthosine, 24; xanthine, 144. These figures divided by 55 correspond to nanomoles of uric acid synthesized min-1 per mg-1 of protein. The rate of synthesis of uric acid obtained with each one of those compounds at 0.1 and 0.05 mM concentrations was also determined. ATP (1 mM) strongly inhibited uric acid synthesis from 0.05 mM AMP (91 per cent) and from 0.05 mM ADP (88 per cent), but not from adenosine. CTP or UTP (1 mM) also inhibited (by more than 90 per cent) the synthesis of uric acid from 0.05 mM AMP. Xanthine oxidase was inhibited by concentrations of hypoxanthine higher than 0.012 mM. The results favour the view that the level of uric acid in plasma may be an index of the energetic state of the organism. Allopurinol, besides inhibiting uric acid synthesis, reduced the rate of degradation of AMP. The ability of crude extracts to catabolize purine nucleotides to uric acid is an important factor to be considered when some enzymes related to purine nucleotide metabolism, particularly CTP synthase, are measured in crude liver extracts.
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Affiliation(s)
- S Bleisch
- Departamento de Bioquímica, Facultad de Medicina, Universidad Autónoma de Madrid, Spain
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Hayashi S, Jain S, Chu R, Alvares K, Xu B, Erfurth F, Usuda N, Rao M, Reddy S, Noguchi T. Amphibian allantoinase. Molecular cloning, tissue distribution, and functional expression. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(17)32711-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
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28
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Usuda N, Hayashi S, Fujiwara S, Noguchi T, Nagata T, Rao MS, Alvares K, Reddy JK, Yeldandi AV. Uric acid degrading enzymes, urate oxidase and allantoinase, are associated with different subcellular organelles in frog liver and kidney. J Cell Sci 1994; 107 ( Pt 4):1073-81. [PMID: 8056832 DOI: 10.1242/jcs.107.4.1073] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
On the basis of differential and density gradient centrifugation studies, the site of the uric acid degrading enzymes, urate oxidase and allantoinase, in amphibia was previously assigned to the hepatic peroxisomes. Using specific antibodies against frog urate oxidase and allantoinase, we have undertaken an immunocytochemical study of the localization of these two proteins in frog liver and kidney, and demonstrate that whereas urate oxidase is present in peroxisomes, allantoinase is localized in mitochondria. Urate oxidase and allantoinase were detected by immunoblot analysis in both frog liver and kidney. The subcellular localization of these two enzymes was ascertained by Protein A-gold immunocytochemical staining of Lowicryl K4M-embedded tissue. Peroxisomes in frog liver parenchymal cells and kidney proximal tubular epithelium contained a semi-dense subcrystalloid core, which was found to be the exclusive site of urate oxidase localization. Allantoinase was detected within mitochondria, but not in peroxisomes of hepatocytes or proximal tubular epithelium. No allantoinase was detected in the mitochondria of nonhepatic parenchymal cells in liver and of the cells lining the distal convoluted tubules of the kidney. These results demonstrate that, unlike rat kidney peroxisomes which lack urate oxidase, peroxisomes of frog kidney contain this enzyme. Contrary to previous assumptions, these studies also clearly establish that urate oxidase and allantoinase, the first two enzymes involved in uric acid degradation, are localized in different subcellular organelles in frog liver and kidney.
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Affiliation(s)
- N Usuda
- Department of Pathology, Northwestern University Medical School, Chicago, Illinois 60611
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Mommsen TP, Walsh PJ. Biochemical and environmental perspectives on nitrogen metabolism in fishes. ACTA ACUST UNITED AC 1992. [DOI: 10.1007/bf01920243] [Citation(s) in RCA: 83] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Evolution of mitochondrial enzyme systems in fish: the mitochondrial synthesis of glutamine and citrulline. PHYLOGENETIC AND BIOCHEMICAL PERSPECTIVES 1991. [DOI: 10.1016/b978-0-444-89124-2.50007-5] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Urea synthesis in fishes: evolutionary and biochemical perspectives. PHYLOGENETIC AND BIOCHEMICAL PERSPECTIVES 1991. [DOI: 10.1016/b978-0-444-89124-2.50010-5] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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