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PLANT PHYSIOLOGY , Vol 104, Issue 1 263-270, Copyright © 1994 by American Society of Plant Biologists
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MOLECULAR BIOLOGY AND GENE REGULATION |
Posttranscriptional Regulation of Ferritin during Nodule Development in Soybean
Y. Kimata and E. C. Theil
Department of Biochemistry, NCSU Box 7622, North Carolina State University, Raleigh, North Carolina 27695-7622
During soybean (Glycine max) nodule development, induced ferritin mRNA
concentration remains elevated while the protein concentration decreases 4-
to 5-fold (M. Ragland and E.C. Theil [1993] Plant Mol Biol 21: 555-560).
Investigation of posttranscriptional regulation of nodule ferritin during
development showed that ferritin mRNA was efficiently translated based on
polyribosome size in vivo, protein synthesis (0.8% of total protein) in
vitro, and protein synthesis in intact nodules. Ferritin, a plastid
protein, was processed in both immature and mature nodules. In chimeric
mRNA, soybean ferritin mRNA sequences blocked the function of the iron
regulatory element (IRE), the cis regulatory element of animal ferritin
mRNA; the IRE regulates chimeric animal mRNAs. The absence of translational
regulation of ferritin in plants contrasts with ferritin regulation in
animals. Thus, ferritin regulation has diverged during evolution, whereas
structure of the mature protein has been conserved. Ferritin in mature
soybean nodules is apparently regulated after translation, possibly in
analogy with such plastid proteins as chlorophyll-binding proteins D1,
CP43, LHCI, and LHCII, the small subunit of ribulose-bisphosphate
carboxylase, and apoplastocyanin. An autocatalytic mechanism observed in
vivo for degradation of plastid protein D1 and in vitro for pea ferritin
during iron release could explain the ferritin decreases in mature nodules.
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