Endoplasmic reticulum preprophase band in dividing root-tip cells of Pinus brutia.
In dividing root-tip cells of Pinus brutia Ten., immunolocalization of the luminal endoplasmic reticulum (ER) proteins, which have the C-terminal HDEL sequence, reveals that the ER is reorganized during the preprophase/prophase stage. Portions of ER were arrayed into a ring-like structure at the site of the microtubule preprophase band (Mt-PPB). This preprophase ER band (ER-PPB) resembles that of the Mt-PPB. The former undergoes a maturation process closely similar to that of the latter. Our data show that the PPB region has a more complex organization than is currently believed. The probable function(s) of the ER-PPB is discussed.
Zachariadis
M
M
University of Athens, Faculty of Biology, Department of Botany, Greece.
Quader
H
H
Galatis
B
B
Apostolakos
P
P
D008841:Actin Cytoskeleton / Q000502:physiology; D000199:Actins / Q000502:physiology; D004721:Endoplasmic Reticulum / Q000502:physiology*; D008870:Microtubules / Q000502:physiology*; D009685:Nuclear Envelope / Q000502:physiology; D009842:Oligopeptides / Q000378:metabolism*; D028223:Pinus / Q000166:cytology / Q000502:physiology*; D018518:Plant Root Cap / Q000166:cytology / Q000502:physiology; D011418:Prophase / Q000502:physiology; D021382:Protein Sorting Signals
D000199:Actins; D009842:Oligopeptides; D021382:Protein Sorting Signals; C077480:histidyl-aspartyl-glutamyl-leucine