Ahmad I, Fatima I, Afza N, Malik A, Lodhi MA, Choudhary MI. Urease and serine protease inhibitory alkaloids from Isatis tinctoria. J. Enzyme Inhib. Med. Chem. 23: 918-921 (2008).

Aleksenko A, Liu W, Gojkovic Z, Nielsen J, Piskur J. Aspergillus nidulans and the evolutionary origin of fungal dihydroorotases. Mol. Microbiol. 33: 599-611 (1999).

Amon J, Titgemeyer F, Burkovski A. A genomic view on nitrogen metabolism and nitrogen control in mycobacteria. J. Mol. Microbiol. Biotechnol. 17: 20-29 (2009).

Atkinson MR, Fisher SH. Identification of genes and gene products whose expression is activated during nitrogen-limited growth in Bacillus subtilis. J. Bacteriol. 173: 23-27 (1991).

Bai C, Reilly CC, Wood BW. Nickel deficiency disrupts metabolism of ureides, amino acids, and organic acids of young pecan foliage. Plant Physiol. 140: 433-443 (2006).

Bascaran V, Hardisson C, Brana AF. Regulation of nitrogen catabolic enzymes in Streptomyces clavuligerus. J. Gen. Microbiol. 135: 2465-2474 (1989).

Charlton S, Moir AJG, Baillie L, Moir A. Characterization of the exosporium of Bacillus cereus. J. Appl. Microbiol. 87: 241-245 (1999).

Cruz C, Egsgaard H, Trujillo C, Ambus P, Requena N, Martins-Loucao MA, Jakobsen I. Enzymatic evidence for the key role of arginine in nitrogen translocation by arbuscular mycorrhizal fungi. Plant Physiol. 144: 782-792 (2007).

Distefano S, Palma JM, McCarthy I, del Rio LA. Proteolytic cleavage of plant proteins by peroxisomal endoproteases from senescent pea leaves. Planta 209: 308-313 (1999).

Flores E, Herrero A. Nitrogen assimilation and nitrogen control in cyanobacteria. Biochem. Soc. Trans. 33: 164-167 (2005).

Freyermuth SK, Bacanamwo M, Polacco JC. The soybean Eu3 gene encodes an Ni-binding protein necessary for urease activity. Plant J. 21: 53-60 (2000).

Garner RM, Fulkerson J Jr, Mobley HL. Helicobacter pylori glutamine synthetase lacks features associated with transcriptional and posttranslational regulation. Infect. Immun. 66: 1839-1847 (1998).

Goldraij A, Beamer LJ, Polacco JC. Interallelic complementation at the ubiquitous urease coding locus of soybean. Plant Physiol. 132: 1801-1810 (2003).

Goldraij A, Polacco JC. Arginase is inoperative in developing soybean embryos. Plant Physiol. 119: 297-304 (1999).

Grotjohann N, Kowallik W, Huang Y, Schulte in den Baumen A. Investigations into enzymes of nitrogen metabolism of the ectomycorrhizal basidiomycete, Suillus bovinus. Z. Naturforsch. [C] 55: 203-212 (2000).

Huber C, Eisenreich W, Hecht S, Wachtershauser G. A possible primordial peptide cycle. Science 301: 938-940 (2003).

Janssen DB, Habets WJ, Marugg JT, Van Der Drift C. Nitrogen control in Pseudomonas aeruginosa: mutants affected in the synthesis of glutamine synthetase, urease, and NADP-dependent glutamate dehydrogenase. J. Bacteriol. 151: 22-28 (1982).

Janssen DB, Herst PM, Joosten HM, van der Drift C. Nitrogen control in Pseudomonas aeruginosa: a role for glutamine in the regulations of the synthesis of NADP-dependent glutamate dehydrogenase, urease and histidase. Arch. Microbiol. 128: 398-402 (1981).

Jassbi AR. Chemistry and biological activity of secondary metabolites in Euphorbia from Iran. Phytochemistry 67: 1977-1984 (2006).

Kim BG, Sobota A, Bitonti AJ, McCann PP, Byers TJ. Polyamine metabolism in Acanthamoeba: polyamine content and synthesis of ornithine, putrescine, and diaminopropane. J. Protozool. 34: 278-284 (1987).

Liu Q, Bender RA. Complex regulation of urease formation from the two promoters of the ure operon of Klebsiella pneumoniae. J. Bacteriol. 189: 7593-7599 (2007).

Lomas MW. Nitrate reductase and urease enzyme activity in the marine diatom Thalassiosira weissflogii (Bacillariophyceae): interactions among nitrogen substrates. Mar. Biol. 144: 37-44 (2004).

Macaluso A, Best EA, Bender RA. Role of the nac gene product in the nitrogen regulation of some NTR-regulated operons of Klebsiella aerogenes. J. Bacteriol. 172: 7249-7255 (1990).

Mallick N, Singh AK, Rai LC. Impact of bimetallic combinations of Cu, Ni and Fe on growth rate, uptake of nitrate and ammonium, 14CO2 fixation, nitrate reductase and urease activity of Chlorella vulgaris. Biol. Met. 2: 223-228 (1990).

Muscolo A, Panuccio MR, Sidari M, Sessi E, Nardi S. Alteration of amino acid metabolism by humic substances during germination of Pinus laricio seeds. Seed Sci. Technol. 30: 205-210 (2002).

Nazario GM, Lovatt CJ. Regulation of purine metabolism in intact leaves of Coffea arabica. Plant Physiol. 103: 1195-1201 (1993).

Nolden L, Beckers G, Burkovski A. Nitrogen assimilation in Corynebacterium diphtheriae: pathways and regulatory cascades. FEMS Microbiol. Lett. 208: 287-293 (2002).

Rai PK, Rai LC. Interactive effects of UV-B and Cu on photosynthesis, uptake and metabolism of nutrients in a green alga Chlorella vulgaris under simulated ozone column. J. Gen. Appl. Microbiol. 43: 281-288 (1997).

Rosenthal GA, Janzen DH, Dahlman DL. Degradation and detoxification of canavanine by a specialized seed predator. Science 196: 658-660 (1977).

Smith CJ, Hespell RB, Bryant MP. Regulation of urease and ammonia assimilatory enzymes in Selenomonas ruminantium. Appl. Environ. Microbiol. 42: 89-96 (1981).

Steglitz-Morsdorf U, Morsdorf G, Kaltwasser H. Cloning, heterologous expression, and sequencing of the Proteus vulgaris glnAntrBC operon and implications of nitrogen control on heterologous urease expression. FEMS Microbiol. Lett. 106: 157-164 (1993).

Stingl K, Altendorf K, Bakker EP. Acid survival of Helicobacter pylori: how does urease activity trigger cytoplasmic pH homeostasis? Trends Microbiol. 10: 70-74 (2002).

Stingl K, Schauer K, Ecobichon C, Labigne A, Lenormand P, Rousselle JC, Namane A, de Reuse H. In vivo interactome of Helicobacter pylori urease revealed by tandem affinity purification. Mol. Cell. Proteomics 7: 2429-2441 (2008).

Todd CD, Polacco JC. Soybean cultivars 'Williams 82' and 'Maple Arrow' produce both urea and ammonia during ureide degradation. J. Exp. Bot. 55: 867-877 (2004).

Vaca G, Mora J. Nitrogen regulation of arginase in Neurospora crassa. J. Bacteriol. 131: 719-725 (1977).

Wakisaka S, Tachiki T, Sung HC, Kumagai H, Tochikura T, Matsui S. A rapid assay method for ammonia using glutamine synthetase from glutamate-producing bacteria. Anal. Biochem. 163: 117-122 (1987).

Witte CP, Isidore E, Tiller SA, Davies HV, Taylor MA. Functional characterisation of urease accessory protein G (ureG) from potato. Plant Mol. Biol. 45: 169-179 (2001).

Witte CP, Rosso MG, Romeis T. Identification of three urease accessory proteins that are required for urease activation in Arabidopsis. Plant Physiol. 139: 1155-1162 (2005).

Witte CP, Tiller S, Isidore E, Davies HV, Taylor MA. Analysis of two alleles of the urease gene from potato: polymorphisms, expression, and extensive alternative splicing of the corresponding mRNA. J. Exp. Bot. 56: 91-99 (2005).

Witte CP, Tiller SA, Taylor MA, Davies HV. Leaf urea metabolism in potato. Urease activity profile and patterns of recovery and distribution of 15N after foliar urea application in wild-type and urease-antisense transgenics. Plant Physiol. 128: 1129-1136 (2002).

Yin S, Ze Y, Liu C, Li N, Zhou M, Duan Y, Hong F. Cerium relieves the inhibition of nitrogen metabolism of spinach caused by magnesium deficiency. Biol. Trace Elem. Res. May 6 [Epub ahead of print] (2009).

Zonia LE, Stebbins NE, Polacco JC. Essential role of urease in germination of nitrogen-limited Arabidopsis thaliana seeds. Plant Physiol. 107: 1097-1103 (1995).

Number of references = 42