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J. Biol. Chem., Vol. 265, Issue 13, 7278-7283, 05, 1990

The ferrochelatase from Saccharomyces cerevisiae. Sequence, disruption, and expression of its structural gene HEM15

R Labbe-Bois
Institut Jacques Monod, Laboratoire de Biochimie des Porphyrines, Universite Paris VII, France.

The HEM15 gene in Saccharomyces cerevisiae encodes ferrochelatase (EC 4.99.1.1, protoheme ferrolyase), a mitochondrial inner membrane-bound enzyme which catalyzes the insertion of ferrous ion into protoporphyrin IX, the last step in protoheme biosynthesis. The gene was isolated by functional complementation of a hem15 mutant. Sequence analysis of a 2.9-kilobase genomic DNA fragment revealed an open reading frame of 1179 nucleotides, plus a gene coding for a tRNA(Val)(GUU) and delta elements downstream from the 3'-end of HEM15. The open reading frame encodes a precursor form of the protein containing a 31-amino acid presequence. The mature enzyme contains 362 amino acid residues; its calculated molecular weight (40,900) and predicted amino-terminal sequence agree with those determined from the purified protein. It is relatively abundant in lysine (9%) and contains no apparent transmembrane segment. Disruption of the HEM15 gene led to non-viable cells in certain genetic background. Northern (RNA) analysis showed a slight (1.5-2-fold) repression of HEM15 expression by glucose.
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