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- W3003876 abstract "This chapter describes the enzymic incorporation of iron into protoporphyrin. Iron can be complexed non-enzymically by coproporphyrinogen and protoporphyrinogen in aqueous solutions, and at physiological pH and temperature. Even under the most favorable conditions found, the rate of nonenzymic heme synthesis is only approximately equal to the average rate of synthesis of cytochrome c heme/l.hr. by a culture of Ustilago sphaerogen a. In the case of the microbial reaction, the ligand concentration at the beginning of a 10 hr fermentation period is essentially zero. It, thus, appears highly improbable that any significant quantity of heme will be formed within living cells by a purely nonenzymic reaction. The fact that both cupric and zinc ions react rapidly with porhyrin c suggests that aggregation in solution is not the most important factor limiting the rate for ferrous iron. The generally slower reaction of the divalent metal ions with porhyrin cytochrome c may be attributed to the known inaccessibility of the prosthetic group in this enzyme." @default.
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- W3003876 date "1961-01-01" @default.
- W3003876 modified "2023-09-25" @default.
- W3003876 title "THE ENZYMIC INCORPORATION OF IRON INTO PROTOPORPHYRIN" @default.
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- W3003876 doi "https://doi.org/10.1016/b978-1-4831-9646-6.50019-3" @default.
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