A missense mutation of L-gulono-gamma-lactone oxidase causes the inability of scurvy-prone osteogenic disorder rats to synthesize L-ascorbic acid.

The osteogenic disorder Shionogi (ODS) rat is a mutant Wistar rat that is subject to scurvy, because it lacks L-gulono-gamma-lactone oxidase, a key enzyme in L-ascorbic acid biosynthesis. Sequencing of polymerase chain reaction-amplified cDNAs for mutant and normal rat L-gulono-gamma-lactone oxidases demonstrated that the mutant cDNA has a single base mutation from G to A at nucleotide 182, which mutation alters the 61st amino acid residue from Cys to Tyr. To test the effect of this mutation on the expression of L-gulono-gamma-lactone oxidase, we inserted a region of the cDNAs coding for normal and mutant L-gulono-gamma-lactone oxidases into an expression vector, pSVL, and transfected COS-1 cells with such vectors. The result indicated that the defined amino acid substitution does decrease both the amount of immunologically detectable protein and the level of enzyme activity to about one-tenth of their normal values, while it does not affect the amount of the mRNA produced in the transfected cells. This situation is similar to our previous observation that L-gulono-gamma-lactone oxidase is expressed in the liver of the ODS rat at a very low level irrespective of the presence of a normal amount of L-gulono-gamma-lactone oxidase-specific mRNA of a normal size (Nishikimi, M., Koshizaka, T., Kondo, K., and Yagi, K. (1989) Experientia (Basel) 45, 126-129). Thus it became clear that the Cys-->Tyr substitution is responsible for the L-gulono-gamma-lactone oxidase deficiency in the ODS rat.

• Publication year

  1992

• Venue

  Journal of Biological Chemistry

• Publication date

  1992-10-25

• Fields of study

  Biology, Medicine

• Identifiers
  DOI 10.1016/s0021-9258(19)36708-0PMID 1400508
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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