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Ca 2+ -Calmodulin Regulates Nuclear Translocation of the Rice Seed-specific MADS-box Transcription Factor OsMADS29.
FEBS Journal 2023 March 3
OsMADS29 (M29) is a crucial regulator of seed development in rice. The expression of M29 is strictly regulated at transcriptional as well as post-transcriptional levels. The MADS-box proteins are known to bind to DNA as dimers. However, in the case of M29, the dimerization also plays a vital role in its localization into the nucleus. The factor(s) that affect oligomerization and nuclear transport of MADS proteins have not yet been characterized. By using BiFC in transgenic BY-2 cell lines and Yeast-2-hybrid assay (Y2H), we show that calmodulin (CaM) interacts with M29 in a Ca2+ dependent manner. This interaction specifically takes place in the cytoplasm, probably in association with the endoplasmic reticulum. By generating domain-specific deletions, we show that both sites in M29 are involved in this interaction. Further, by using BiFC-FRET-FLIM, we demonstrate that CaM may also help in the dimerization of two M29 monomers. Since most MADS proteins have CaM binding domains, the interaction between these proteins could be a general regulatory mechanism for oligomerization and nuclear transport.
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