PMID:3052434
| Citation |
Jordan, PM, Thomas, SD and Warren, MJ (1988) Purification, crystallization and properties of porphobilinogen deaminase from a recombinant strain of Escherichia coli K12. Biochem. J. 254:427-35 |
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| Abstract |
Porphobilinogen deaminase has been purified and crystallized from an overproducing recombinant strain of Escherichia coli harbouring a hemC-containing plasmid which has permitted the purification of milligram quantities of the enzyme. Determination of the Mr of the enzyme by SDS/polyacrylamide-gel electrophoresis (35,000) and gel filtration (32,000) agrees with the gene-derived Mr of 33,857. The enzyme has a Km of 19 +/- 7 microM, an isoelectric point of 4.5 and an N-terminal sequence NH2-MLDNVLRIAT. The substrate, porphobilinogen, binds to the active-site dipyrromethane cofactor to form three intermediate complexes: ES, ES2 and ES3. The gene-derived primary structure of the E. coli deaminase is compared with that derived from the cDNA of the human enzyme. |
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| Keywords |
Amino Acid Sequence; Amino Acids/analysis; Ammonia-Lyases/isolation & purification; Chromatography, Ion Exchange; Crystallization; Electrophoresis, Polyacrylamide Gel; Escherichia coli/enzymology; Escherichia coli/genetics; Genetic Engineering; Hydrogen-Ion Concentration; Hydroxymethylbilane Synthase/genetics; Hydroxymethylbilane Synthase/isolation & purification; Hydroxymethylbilane Synthase/metabolism; Macromolecular Substances; Molecular Sequence Data; Molecular Weight; Porphobilinogen/metabolism |
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