PMID: 5916943Oct 28, 1966

Coordinate synthesis of heme and apoenzyme in the formation of tryptophan pyrrolase

Science
H S MARVERA COLLINS

Abstract

Reciprocal control mechanisms between hemoprotein and 8-aminolevulinic acid synthetase take part in coordinate synthesis of the heme and apoenzyme moieties of tryptophan pyrrolase. Stimulation of heme biosynthesis increases tryptophan pyrrolase, whereas enhancement of heme binding by apotryptophan pyrrolase secondarily increases the formation of delta-aminolevulinic acid synthetase, the rate-limiting enzyme in heme formation. Tryptophan-mediated induction of delta-aminolevulinic acid synthetase suggests that heme participates in repression of that enzyme

Citations

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Related Concepts

Enzyme Repression
Heme
Levulinic Acids
Ligase
Liver
Oxygenases
Tryptophan Oxygenase

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