Huber, Hans and Beyser, Kurt and Fabry, Stefan (1996) Small G proteins of two green algae are localized to exocytic compartments and to flagella. PLANT MOLECULAR BIOLOGY, 31 (2). pp. 279-293. ISSN 0167-4412, 1573-5028
Full text not available from this repository.Abstract
The Ypt/Rab proteins are small GTPases, which belong to the Ras superfamily and have been shown to be involved in endo- and exocytosis in mammalian cells and yeast. Using affinity-purified antibodies specific for four Ypt proteins, namely Ypt1p, Ypt4p, Ypt5p and Ypt6p, of the multicellular green alga Volvox carteri (YptVp) and its close unicellular relative Chlamydomonas reinhardtii (YptCp), we examined the abundance of the corresponding antigens during the asexual life cycle of Volvox, and their intracellular localization. The YptV proteins were found in all stages throughout the asexual life cycle and are tightly associated with intracellular membranes. Indirect immunofluorescence revealed that YptV4p, YptV5p and YptV6p are present in perinuclear regions of the cell, indicating an association with the Golgi region. Golgi localization of YptV4p and YptV6p in Volvox was confirmed by immunogold electron microscopy. In contrast, we found Ypt1p associated with the contractile vacuole in both V. carteri and C. reinhardtii. Furthermore, the YptV proteins were also detected along the entire length of the flagella of somatic Volvox cells. This flagellar location was substantiated by western blot analysis of extracts prepared from isolated flagella of both algae. While localization to exocytic compartments is in agreement with the established Ypt/Rab function in intracellular vesicle transport of eukaryotic cells, presence in the algal flagellum is the first hint of a possible role for small G proteins also in motility organelles.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | GTP-BINDING-PROTEINS; ASEXUAL LIFE-CYCLE; VOLVOX-CARTERI; VESICULAR TRANSPORT; CHLAMYDOMONAS-REINHARDTII; ENDOPLASMIC-RETICULUM; RAB PROTEINS; YPT GENES; EXPRESSION; FAMILY; Ras superfamily; Ypt/Rab proteins; Volvox carteri; Chlamydomonas reinhardtii |
| Subjects: | 500 Science > 570 Life sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Biochemie, Genetik und Mikrobiologie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 06 Jul 2023 09:36 |
| Last Modified: | 06 Jul 2023 09:36 |
| URI: | https://pred.uni-regensburg.de/id/eprint/51753 |
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