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Biochem J. 1988 Sep 1;254(2):427-35.

Purification, crystallization and properties of porphobilinogen deaminase from a recombinant strain of Escherichia coli K12.

Author information

1
Department of Biochemistry, University of Southampton, U.K.

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.

PMID:
3052434
PMCID:
PMC1135095
[Indexed for MEDLINE]
Free PMC Article

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