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. 1985 Mar;82(6):1673–1677. doi: 10.1073/pnas.82.6.1673

Nucleotide sequence of murine ornithine decarboxylase mRNA.

C Kahana, D Nathans
PMCID: PMC397334  PMID: 3856848

Abstract

Ornithine decarboxylase (OrnDCase; L-ornithine carboxy-lyase, EC 4.1.1.17) is the first and rate-limiting enzyme in the biosynthesis of polyamines in mammalian cells. During cell growth the enzyme is regulated by rapid changes in the level of its mRNA and protein. To explore the molecular basis of these changes, we cloned a full-length cDNA copy of the major 2.4-kilobase OrnDCase mRNA from mouse cells and determined its sequence. The cDNA contains 2465 nucleotides derived from OrnDCase mRNA, consisting of a 737-nucleotide-long 5' noncoding segment, a coding segment of 1383 nucleotides terminated by a TAG triplet, and a 342-nucleotide 3' noncoding segment. The encoded protein of 461-amino acid residues has a molecular weight of 51,105 and has a potential site for phosphorylation by casein kinase II. In the unusually long 5' leader sequence, there are four ATG triplets, each of which is followed by an in-phase termination signal; the presence of these upstream ATGs could explain the low in vitro translational activity of OrnDCase mRNA reported earlier. A restriction digest of mouse genomic DNA was probed with a defined OrnDCase coding sequence, revealing a multimembered family of OrnDCase-related genes.

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Selected References

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