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THE PLANT CELL, Vol 8, Issue 11 2003-2014, Copyright © 1996 by American Society of Plant Biologists
EF-1[alpha] Is Associated with a Cytoskeletal Network Surrounding Protein Bodies in Maize Endosperm Cells
A. M. Clore, J. M. Dannenhoffer and B. A. Larkins
Department of Plant Sciences, University of Arizona, Tucson, Arizona 85721
By using indirect immunofluorescence and confocal microscopy, we documented
changes in the distribution of elongation factor-1[alpha] (EF-1[alpha]),
actin, and microtubules during the development of maize endosperm cells. In
older interphase cells actively forming starch grains and protein bodies,
the protein bodies are enmeshed in EF-1[alpha] and actin and are found
juxtaposed with a multidirectional array of microtubules. Actin and
EF-1[alpha] appear to exist in a complex, because we observed that the two
are colocalized, and treatment with cytochalasin D resulted in the
redistribution of EF-1[alpa]. These data suggest that EF-1[alpha] and actin
are associated in maize endosperm cells and may help to explain the basis
of the correlation we found between the concentration of EF-1[alpha] and
lysine content. The data also support the hypothesis that the cytoskeleton
plays a role in storage protein deposition. The distributions of
EF-1[alpha] actin, and microtubules change during development. We observed
that in young cells before the accumulation of starch and storage protein,
EF-1[alpha], actin, and microtubules are found mainly in the cell cortex or
in association with nuclei.
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