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. 1979 Feb;76(2):833–836. doi: 10.1073/pnas.76.2.833

Heme biosynthesis in Friend erythroleukemia cells: control by ferrochelatase.

T Rutherford, G G Thompson, M R Moore
PMCID: PMC383066  PMID: 284406

Abstract

The activities of the enzymes of heme biosynthesis (except protoporphyrin oxidase) have been followed during the induction of Friend cells in culture. All the enzyme activities increased after induction with dimethyl sulfoxide. The activities of the intermediate enzymes were much higher than those of delta-aminolevulinate synthase [succinyl-CoA:glycine C-succinyltransferase (decarboxylating), EC 2.3.1.37], the initial enzyme, or ferrochelatase (protoheme ferro-lyase, EC 4.99.1.1), the final enzyme of the pathway. Ferrochelatase activity was not detectable in the uninduced cell. delta-Aminolevulinate synthase activity increased during the first 24 hr of induction; porphobilinogen deaminase activity began to increase after 48 hr and ferrochelatase activity, after 72 hr. However, the induction of heme synthesis followed the same time course as that of ferrochelatase activity, not that of delta-aminolevulinate synthase activity. The cellular growth medium was found to contain traces of protoporphyrins. Thus, ferrochelatase is shown to be rate limiting for heme synthesis during early stages of Friend cell induction. A Friend cell variant (Fw), which is not inducible except in the presence of exogenous hemin, was also studied. All the enzymes of heme synthesis except ferrochelatase were inducible by butyric acid. Ferrochelatase was not inducible by butyric acid or hemin plus butyric acid. These cells also excrete protoporphyrin, The failure to induce ferrochelatase activity is believed to be the cause of, not a consequence of, the noninducibility of this cell line.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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