This repeat is found as seven tandem copies in carbohydrate-binding proteins, including Fucose-binding Lectin from Photorhabdus laumondii (Swiss:Q7N8J0) and similar fungal and bacterial proteins. It is composed of beta-strands and forms a seven-bladed beta-propeller structure [2,3]. It is found in association with BNR repeats, which also form a beta-propeller.

1: New Knowledge from Old: In silico discovery of novel protein domains in Streptomyces coelicolor. Yeats C, Bentley S, Bateman A; BMC Microbiol 2003;3:3-3. PMID:12625841

2: A Novel Fucose-binding Lectin from Photorhabdus luminescens (PLL) with an Unusual Heptabladed beta-Propeller Tetrameric Structure. Kumar A, Sykorova P, Demo G, Dobes P, Hyrsl P, Wimmerova M; J Biol Chem. 2016;291:25032-25049. PMID:27758853

3: Visualization of hydrogen atoms in a perdeuterated lectin-fucose complex reveals key details of protein-carbohydrate interactions. Gajdos L, Blakeley MP, Kumar A, Wimmerova M, Haertlein M, Forsyth VT, Imberty A, Devos JM; Structure. 2021;29:1003-1013. PMID:33765407