Molecular cloning of hepatic 5‐aminolevulinate synthase

Abstract
Hepatic 5-aminolevulinate synthase was induced in chick embryos by administration of the porphyrinogenic drugs 2-allyl-2-isopropylacetamide and 3,5-diethoxycarbonyl-1,4-dihydrocollidine. A cDNA [complementary DNA] library was constructed from drug-induced liver mRNA and clones containing sequences coding for 5-aminolevulinate synthase were identified by hybrid-selected translation. The identity of these clones was confirmed by comparing DNA sequence data with the amino acid sequence of peptides from purified 5-aminolevulinate synthase. From Northern blot analysis the size of the mRNA for 5-aminolevulinate synthase was estimated to be 2800 base pairs, .apprx. 600 base pairs more than that required to code for the primary translation product of relative molecular mass 74,000.

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