Abstract:
:The isolation and characterization of homogeneous arginine kinase from the cockroach is reported. The purification protocol produces 6.6 mg of pure enzyme from 6.8 g of whole cockroach. The purified enzyme cross-reacts with a heterologous antibody and monoclonal antibody against arginine kinase from the shrimp. Both antibody preparations also cross-react with extracts from several species known to contain monomeric arginine kinase, but fail to react with extracts from organisms containing dimeric arginine kinase. Cockroach arginine kinase has a molecular mass of approximately 43,000 determined from measurements by gel filtration and gel electrophoresis. Compared with other arginine kinases, the enzyme from the cockroach is relatively thermostable (50% activity retained at 50 degrees C for 10 min) and has a pH optima of 8.5 and 6.5-7.5, for the forward and reverse reactions, respectively. Treatment with 5,5'dithiobis[2-nitrobenzoic acid] indicates that arginine kinase has a single reactive sulfhydryl group and, interestingly, the reaction is biphasic. The Michaelis constants for the phosphagen substrates, arginine: 0.49 mM, phosphoarginine: 0.94 mM, and nucleotide substrates MgATP: 0.14 mM, MgADP: 0.09 mM, are in the range reported for other arginine kinases. A 1% solution of pure enzyme has an absorbance of 7.0 at 280 nm. Calculations based on circular dichroic spectra indicate that arginine kinase from the cockroach has 12% alpha-helical structure. The intrinsic protein fluorescence emission maximum at 340 nm suggests that tryptophan residues are below the surface of the protein and not exposed to solvent. Arginine kinase from the cockroach and shrimp are known to be deleterious immunogens towards humans. The availability of pure protein, its characterization and potential regulation of activity, will be useful in developing agents to control the cockroach population and its destructive role in agriculture and human health.
journal_name
Arch Insect Biochem Physioljournal_title
Archives of insect biochemistry and physiologyauthors
Brown AE,France RM,Grossman SHdoi
10.1002/arch.10143subject
Has Abstractpub_date
2004-06-01 00:00:00pages
51-60issue
2eissn
0739-4462issn
1520-6327journal_volume
56pub_type
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journal_title:Archives of insect biochemistry and physiology
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