Full-length cDNA clone encoding human glycine decarboxylase (P-protein) was isolated from the human placental λgt11 expression library using specific antibodies. This clone was 3,705 bp in length and encoded 1,020 amino acids. We studied the structure of the mutant P-protein mRNA expressed in the liver of a patient with nonketotic hyperglycinemia (NKH) deficient of P-protein. A three-base deletion, which resulted in deletion of Phe756, was found. Cos7 cells in which normal P-protein cDNA was expressed presented an activity of 6.9±0.41 nmole/milligram of protein/hour, which was almost equivalent to that of human liver. In contrast, Cos7 cells in which the mutant cDNA was expressed showed no activity, indicating that the three-base deletion could cause NKH.
|Number of pages||7|
|Journal||Biochemical and biophysical research communications|
|Publication status||Published - 1991 Feb 14|
ASJC Scopus subject areas
- Molecular Biology
- Cell Biology