Reversible redistribution of phytochrome within the cell upon conversion to its physiologically active form.
AUTOR(ES)
Mackenzie, J M
RESUMO
The intracellular localization of phytochrome was seen in dark-grown oat (Avena sativa L., cv. Garry) and rice (Oryza sativa L., cv. unknown) shoots after various light treatments using an indirect peroxidase-antiperoxidase antibody labeling method. Phytochrome is generally distributed throughout the cytoplasm in cells of tissue that had not been exposed to light prior to fixation. Within, at most, 8 min after the onset of saturating red irradiation, phytochrome, now present in the far-red-absorbing form, becomes associated with discrete regions of the cell. These regions do not appear to be nuclei, plastids, or mitochondria. After phototransformation back to the red-absorbing form originally present, phytochrome slowly resumes its general distribution. It is possible that this discrete localization of the far-red-absorbing form of phytochrome represents a physiologically significant binding with a receptor site in the cell.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=432407Documentos Relacionados
- Chromophore structure of the physiologically active form (Pfr) of phytochrome
- alpha-Amylase biosynthesis: signal sequence prevents normal conversion of the unprocessed precursor molecule to the biologically active form.
- Conversion of myoblasts to physiologically active neuronal phenotype
- Characterization of a Molecular Modification of Phytochrome That Is Associated with Its Conversion to the Far-Red-Absorbing Form 1
- Changes in Helicobacter pylori ultrastructure and antigens during conversion from the bacillary to the coccoid form.