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. 1988 Feb;86(2):497–504. doi: 10.1104/pp.86.2.497

Characterization of the RNA Required for Biosynthesis of δ-Aminolevulinic Acid from Glutamate 1

Purification by Anticodon-Based Affinity Chromatography and Determination That the UUC Glutamate Anticodon Is a General Requirement for Function in ALA Biosynthesis

Mark A Schneegurt 1, Samuel I Beale 1
PMCID: PMC1054512  PMID: 16665935

Abstract

The heme and chlorophyll precursor δ-aminolevulinic acid acid (ALA) is formed in plants and algae from glutamate in a process that requires at least three enzyme components plus a low molecular weight RNA which co-purifies with the tRNA fraction during DEAE-cellulose column chromatography. RNA that is effective in the in vitro ALA biosynthetic system was extracted from several plant and algal species that form ALA via this route. In all cases, the effective RNA contained the UUC glutamate anticodon, as determined by its specific retention on an affinity resin containing an affine ligand directed against this anticodon. Construction of the affinity resin was based on the fact that the UUC glutamate anticodon is complementary to the GAA phenylalanine anticodon. By covalently linking the 3′ terminus of yeast tRNAPhe(GAA) to hydrazine-activated polyacrylamide gel beads, a resin carrying an affine ligand specific for the anticodon of tRNAGlu(UUC) was obtained. Column chromatography of plant and algal RNA extracts over this resin yielded a fraction that was highly enriched in the ability to stimulate ALA formation from glutamate when added to enzyme extracts of the unicellular green alga Chlorella vulgaris. Enhancement of ALA formation per A260 unit added was as much as 50 times greater with the affinity-purified RNA than with the RNA before affinity purification. The affinity column selectively retained RNA which supported ALA formation upon chromatography of RNA extracts from species of the diverse algal groups Chlorophyta (Chlorella Vulgaris), Euglenophyta (Euglena gracilis), Rhodophyta (Cyanidium caldarium), and Cyanophyta (Synechocystis sp. PCC 6803), and a higher plant (spinach). Other glutamate-accepting tRNAs that were not retained by the affinity column were ineffective in supporting ALA formation. These results indicate that possession of the UUC glutamate anticodon is a general requirement for RNA to participate in the conversion of glutamate to ALA in plants and algae.

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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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