Tub_N is the N-terminal region of Tubby proteins. It carries a nuclear localisation signal and is able to activate transcription [1].

1: The tubby-like proteins, a family with roles in neuronal development and function. Ikeda A, Nishina PM, Naggert JK; J Cell Sci. 2002;115:9-14. PMID:11801719

2: Tulp3 is a critical repressor of mouse hedgehog signaling. Cameron DA, Pennimpede T, Petkovich M; Dev Dyn. 2009;238:1140-1149. PMID:19334287

3: Tubby-like protein 3 (TULP3) regulates patterning in the mouse embryo through inhibition of Hedgehog signaling. Norman RX, Ko HW, Huang V, Eun CM, Abler LL, Zhang Z, Sun X, Eggenschwiler JT; Hum Mol Genet. 2009;18:1740-1754. PMID:19286674

4: TULP3 bridges the IFT-A complex and membrane phosphoinositides to promote trafficking of G protein-coupled receptors into primary cilia. Mukhopadhyay S, Wen X, Chih B, Nelson CD, Lane WS, Scales SJ, Jackson PK; Genes Dev. 2010;24:2180-2193. PMID:20889716