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| Content Provider | PubMed Central |
|---|---|
| Author | Lu, Ti-shen Mazelis, Mendel |
| Abstract | Ornithine: 2-oxoacid aminotransferase (EC 2.6.1.13) has been purified over 400-fold with a total recovery of 14% from acetone powders of cotyledons of germinating squash (Cucurbita pepo, L.) seedlings. The pH optimum of the transamination between l-ornithine and α-ketoglutarate is 8 and the Michaelis constants are 4.7 mm and 6.3 mm, respectively. The enzyme has a molecular weight of 48,000 as determined by gel filtration. The reaction is essentially specific for α-ketoglutarate as the amino group acceptor. The enzyme is inhibited very strongly by hydroxylamine, and less severely by NaCN and isonicotinylhydrazide. No inhibition is observed in the presence of 10 mm l-cysteine. The energy of activation is 7.6 kcal/mole. The stability of the enzyme preparation is enhanced by the presence of dithioerythritol and glycerol. The enzyme activity of the most purified fraction is stimulated 30% by the addition of pyridoxal phosphate; however, the evidence for the unequivocal involvement of pyridoxal phosphate was inconclusive. |
| Starting Page | 502 |
| File Format | |
| ISSN | 15322548 |
| e-ISSN | 15322548 |
| Journal | Plant Physiology |
| Issue Number | 3 |
| Volume Number | 55 |
| Language | English |
| Publisher Date | 1975-03-01 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Genetics Physiology Plant Science |
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