Protein Transparent TESTA 16 (TT16) Arabidopsis Thaliana Recombinant Protein

Encodes a MADS box protein. Regulates proanthocyanidin biosynthesis in the inner-most cell layer of the seed coat. Also controls cell shape of the inner-most cell layer of the seed coat. Also shown to be necessary for determining the identity of the endothelial layer within the ovule. Paralogous to GOA. Plays a maternal role in fertilization and seed development.

Transcription factor involved in the developmental regulation of the endothelium and in the accumulation of proanthocyanidins (PAs) or condensed tannins which give the seed its brown pigmentation after oxidation (PubMed:12368498, PubMed:16080001). Necessary for the normal activation of the BANYULS promoter in the endothelium body (PubMed:12368498). Is required, together with AGL11/STK for the maternal control of endothelium formation, which is essential for female gametophyte development and fertilization, and seed formation (PubMed:22176531). Interacts genetically with AGL1/SHP1 and AGL5/SHP2 in a partially antagonistic manner and represses AGL1/SHP1, AGL5/SHP2, and AGL8/FUL during flower development. Is essential for the coordination of cell divisions in ovule, seed coat development and endosperm formation (PubMed:27776173). Mediates the crosstalk between endothelium and nucellus to ensure proper seed formation. Functions redundantly with AGL63/GOA to repress nucellus growth and promote its degeneration. Represses the negative regulator of autophagy and programmed cell death HVA22D in the proximal nucellus (PubMed:27233529). Binds specifically to the CArG box DNA sequence 5'-CC (A/T)6 GG-3' (PubMed:16080001).