Abstract

1. 1. In vitro formation of 5-aminolevulinic acid (ALA) from glutamate required two enzyme fractions, separable on Blue Sepharose affinity chromatography, and a tRNA fraction, which can be replaced by Escherichia coli tRNA Glu in the reconstituted assay. 2. 2. Gabaculine was shown to inhibit ALA formation in the complete assay as well as in a defined system consisting of only glutamate-1-semialdehyde and the enzyme fraction not retained on Blue Sepharose. 3. 3. The results indicate that the enzyme system supporting ALA formation in Clostridium thermoaceticum is very similar to the tRNA Glu-dependent C 5 pathway in plant plastids.

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