The F-box protein Transport inhibitor response 1 (TIR1) is a receptor for auxin, triggering an auxin-enhanced and ubiquitin-mediated degradation of substrates [1]. The targets are recruited via interaction with the leucine-rich repeat region of the protein. This Pfam entry represents a specific unit of the LRR region, including an insertion of one short alpha-helix in the loop between the beta-strand and the following helix. It shares some sequence homology with a unit with similar structure of Coronatine-insensitive protein 1 [2].

1: Small-molecule agonists and antagonists of F-box protein-substrate interactions in auxin perception and signaling. Hayashi K, Tan X, Zheng N, Hatate T, Kimura Y, Kepinski S, Nozaki H; Proc Natl Acad Sci U S A. 2008;105:5632-5637. PMID:18391211

2: Jasmonate perception by inositol-phosphate-potentiated COI1-JAZ co-receptor. Sheard LB, Tan X, Mao H, Withers J, Ben-Nissan G, Hinds TR, Kobayashi Y, Hsu FF, Sharon M, Browse J, He SY, Rizo J, Howe GA, Zheng N; Nature. 2010;468:400-405. PMID:20927106