| Autor: |
Porra, R.J., Schäfer, W., Katheder, Ingrid, Scheer, H. |
| Zdroj: |
FEBS Letters; August 1995, Vol. 371 Issue: 1 p21-24, 4p |
| Abstrakt: |
Using mass spectrometry, we have demonstrated 18O‐labelling of both the 131‐oxo and 3‐acetyl groups of newly‐formed bacteriochlorophyll asynthesized by Rhodobacter sphaeroidescells during adaptation from respiratory to photosynthetic conditions in the presence of H218O. This derivation of the 131‐oxo group of bacteriochlorophyll afrom water provides a stark constrast with that of chlorophylls in higher plants where ring E formation is an aerobic process in which the 131‐oxo group arises from molecular oxygen via an oxygenase activity. The formation of the 3‐acetyl group of bacteriochlorophyll a, however, is consistent with the enzymic hydration of the 3‐vinyl group of a derivative of chlorophyll a. |
| Databáze: |
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