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. 1984 Jun 15;220(3):755–765. doi: 10.1042/bj2200755

Rat hepatic uroporphyrinogen III co-synthase. Purification and evidence for a bound folate coenzyme participating in the biosynthesis of uroporphyrinogen III.

M Kohashi, R P Clement, J Tse, W N Piper
PMCID: PMC1153693  PMID: 6466301

Abstract

Rat hepatic uroporphyrinogen III co-synthase was isolated and purified 73-fold with a 13% yield by (NH4)2SO4 fractionation and sequential chromatography on DEAE-Sephacel, Sephadex G-100 (superfine grade) and folate-AH-Sepharose 4B. The purified co-synthase has an Mr of approx. 42 000, and is resolved into two bands, each possessing co-synthase activity, by polyacrylamide-gel electrophoresis. A factor was dissociated from the purified co-synthase. Results of both microbiological and competitive protein-binding assays suggest that it is a pteroylpolyglutamate. The isolated pteroylpolyglutamate factor was co-eluted with authentic N5-methyltetrahydropteroylheptaglutamate on DEAE-Sephacel. Uroporphyrinogen III is formed by cosynthase-free preparations of uroporphyrinogen I synthase in the presence of tetrahydropteroylglutamate. Tetrahydropeteroylheptaglutamate is also able to direct the formation of equivalent amounts of uroporphyrinogen III at a concentration approximately one-hundredth that of tetrahydropteroylmonoglutamate. These results suggest that a reduced pteroylpolyglutamate factor is associated with rat hepatic uroporphyrinogen III co-synthase, and that this may function as a coenzyme for the biosynthesis of uroporphyrinogen III.

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Selected References

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