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. 1967 Nov;46(11):1778–1784. doi: 10.1172/JCI105668

Inhibition of Synthesis of Fetal Hemoglobin by an Isoleucine Analogue*

George R Honig 1,‡
PMCID: PMC292928  PMID: 4964832

Abstract

Reticulocytes from newborn infants with Rh isoimmune hemolytic disease actively incorporated radioactive amino acids in vitro into hemoglobins F and A. Approximately 50% of the reticulocytes appeared capable of synthesis of both of these hemoglobins within the same cell, as demonstrated by the selective elution technique of Betke and Kleihauer. An isoleucine analogue, L-O-methylthreonine, inhibited the incorporation of a variety of amino acids into hemoglobin F, without significantly affecting the synthesis of hemoglobin A. The inhibition was prevented upon concomitant addition of L-isoleucine to the medium. These observations suggest that an independent biosynthetic apparatus is present in the cell for the synthesis of each of these two hemoglobins. Because isoleucine is present only in the gamma chains of hemoglobin F, the inhibitory effect of the analogue on the synthesis of this hemoglobin must represent a selective effect on the production of gamma chains.

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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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