MADS-box proteins are transcription factors present in different eukaryotic kingdoms. In contrast to plants, for mammalian and yeast MADS-box proteins ternary complex formation with unrelated transcription factors was reported. We show here the first identification of such ternary interaction in plants. A rice seed-specific NF-YB was identified as partner of OsMADS18 by two-hybrid screening. NF-YB contains a histone fold motif, HFM,(1) and is part of the trimeric CCAAT-binding NF-Y complex. OsMADS18, alone or in combination with a natural partner, interacts with OsNF-YB1 through the MADS and I regions. The mouse NF-YB also associates with OsMADS18 in vivo and in vitro as a NF-YB-NF-YC dimer. Other rice MADS-box proteins do not interact in these assays, indicating specificity for the interaction. OsNF-YB1 is capable of heterodimerizing with NF-YC, but not trimerizing with NF-YA, thus precluding CCAAT binding. Mutation of the variant Asp at position 99 of the HFM alpha2-helix into a conserved serine recovers the capacity to interact with NF-YA, but not with DNA. This is the first indication that members of the NF-YB family work through mechanisms independent of the CCAAT box.
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|Data di pubblicazione:||2002|
|Titolo:||Ternary complex formation between MADS-box transcription factors and the histone fold protein NF-YB|
|Autori:||S. Masiero; C. Imbriano; F. Ravasio; R. Favaro; N. Pelucchi; MS Gorla; R. Mantovani; L. Colombo; MM Kater|
|Autori interni:||IMBRIANO, Carol |
|Digital Object Identifier (DOI):||10.1074/jbc.M202546200|
|Rivista:||THE JOURNAL OF BIOLOGICAL CHEMISTRY|
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