| | 1 | Author
| Dieter Strack | Requires cookie* | | | Title
| Sinapine as a Supply of Choline for the Biosynthesis of Phosphatidylcholine in Raphanus sativus Seedlings  | | | | Abstract
| Biosynthesis o f phosphatidylcholine in young seedlings o f Raphanus sativus is supplied with choline from degradation of the seed constituent sinapine (sinapoylcholine). This conclusion has been deduced from the following results: (1) Raphanus sativus seedlings accumulate approx. 70 nmol phosphatidylcholine which may be relevant for the consumption of choline, liberated during hydrolysis of approx. 130 nmol sinapine. (2) [14C]choline and [14C]ethanolamine, taken up by germinating Raphanus seeds, are exclu sively consumed in the biosynthesis o f phosphatidylcholine and phosphatidylethanolamine, respectively. (3) Pulse-chase experiments with seedlings at different germination stages show a reduced [14C]choline incorporation into phosphatidylcholine at the time when degradation o f sinapine occurs, obviously as a result of an isotope dilution by an increase o f the endogenous choline pool. (4) After [14C]choline pulse to immature seeds, during the process o f seed maturation most of the activity taken up is incorporated into accumulating sinapine and approx. 50% compared to this into phosphatidylcholine. During seedling development the quantity o f labelled sinapine rapidly decreases as a result of sinapine degradation with a concomitant label increase in free choline, phosphorylcholine, and phosphatidylcholine. Approx. 50% of the choline liberated from sinapine, is consumed in the biosynthesis of phosphatidylcholine. High performance liquid chromatographic analyses of phosphatidylcholine during Raphanus germination revealed that this phospholipid might be a metabolically active compound. Changes in the absorptivity of this compound at 210 nm indicate changes in the degree of unsaturation in the fatty acyl groups. | | | |
Reference
| Z. Naturforsch. 36c, 215—221 (1981); received December 231980 | | | |
Published
| 1981 | | | |
Keywords
| Sinapine, Phosphatidylcholine, Phenylpropanoids, Phospholipids, Raphanus, Brassicaceae | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_C/36/ZNC-1981-36c-0215.pdf | | | | Identifier
| ZNC-1981-36c-0215 | | | | Volume
| 36 | |
| 2 | Author
| M. Suwalsky, J. Tapia | Requires cookie* | | | Title
| X-Ray Studies on Phospholipid Bilayers I. Polymorphic Forms of Dimyristoyl Lecithin | | | | Abstract
| A structural study o f the synthetic phospholipid, L-a-dimyristoyl lecithin (DM L), has been m ade by X-ray fiber diffraction methods. Three different types o f oriented specimens were prepared. They were X-ray photographed under the same conditions, including tem perature and relative humidity. T hree different types o f diffraction patterns, corresponding to different confor mations and/or packing arrangements, were found. They are characterized by their unit cell dimensions, space groups, molecular conformations, and packing arrangements. | | | |
Reference
| Z. Naturforsch. 36c, 875—8 (1981); received April 13 1981 | | | |
Published
| 1981 | | | |
Keywords
| Phospholipid, Bilayer, X-Ray D iffraction, Dimyristoyl Lecithin, M em brane | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_C/36/ZNC-1981-36c-0875.pdf | | | | Identifier
| ZNC-1981-36c-0875 | | | | Volume
| 36 | |
| 3 | Author
| N. Weber, K. Wayss, M. Volm, IrmgardK. Iew Itt, K. D. Mukherjee | Requires cookie* | | | Title
| Specific Positional Distribution of Acyl Moieties in Phospholipids is not Generally Deleted in Neoplastic Cells | | | | Abstract
| The distribution o f acyl moieties at sn-1 and sn-2 positions of cholinephosphoglycerides (CPG) and ethanolaminephosphoglycerides (EPG) has been determined for neurosarcoma, sarcoma 180 and leukemia L 1210. In all the three samples, the positional distribution o f acyl moieties in the two major classes o f phospholipids is found to be similar to that in cellular phospholipids o f most mammalian tissues. The saturated acyl moieties are located predominantly at sn-1 and polyunsaturated acyl moieties at sn-2, whereas the monounsaturated acyl moieties are randomly distributed between these two positions. Apparently, a disruption of specific positioning o f acyl moieties in phospholipids, which hitherto has been in neoplasia, does not exist in all neoplastic cells. | | | |
Reference
| Z. Naturforsch. 36c, 81—8 (1981); received September 26 1980 | | | |
Published
| 1981 | | | |
Keywords
| Positional Distribution o f Acyl Moieties, Phospholipids, Neurosarcoma, Sarcoma 180, Leukemia L 1210 | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_C/36/ZNC-1981-36c-0081.pdf | | | | Identifier
| ZNC-1981-36c-0081 | | | | Volume
| 36 | |
|
