TABLE 3.
Effect of various compounds on histidine uptake
| Competitor | Mean % inhibition of uptake with the following concn of cold competitora:
|
|
|---|---|---|
| 20 μM | 200 μM | |
| Proline | 30 | 43 |
| Proline betaine | 45 | 43 |
| Glycine betaine | 8 | 27 |
| Ectoine | 15 | 56 |
| Carnitine | 15 | 14 |
| Choline | 0 | 0 |
| Arginine | 0 | 0 |
| Imidazole | 0 | 0 |
a
The results are expressed as percent inhibition of histidine uptake and are means of three independent experiments. Uptake was realized with 2 μM of [14C]histidine. The control value was 21.5 nmol of histidine transported/5 min/mg of protein.