ara genes encoding YPT/RAB like small GTP-binding proteins, which are involved in the vesicular transport system in various eukaryotic cells, have been isolated from Arabidopsis thaliana. To determine the subcellular localization of ARA-4 protein, suspensions of cultured transgenic tobacco cells were analyzed using monoclonal antibody to Arabidopsis thaliana ARA-4 protein. ARA-4 protein was found in the microsomal membrane fraction. Similar results were obtained withArabidopsis thaliana cells. The ARA-4 protein was readily released by detergents, such as 0.5 % sodium deoxycholate and NP-40. The results of immuno-blot analysis with extracts of different organs show that the ARA-4 protein is present in most organs of Arabidopsis thaliana plants, e. g. root, stem, flower and young fruit, at the same level in all organs except for root, where the level is lower.
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