This C-terminal domain of BBP1, a spindle pole body component, carries coiled-coils that are necessary for the localisation of BBP1 to the spindle pole body (SPB) [1]. Although not a membrane protein itself, BBP1 binds to Mps2 as well as to Spc29 and the half-bridge protein Kar1, thus providing a model for how the SPB core is tethered within the nuclear envelope and to the half-bridge [2]

1: Requirement for Bbp1p in the proper mitotic functions of Cdc5p in Saccharomyces cerevisiae. Park CJ, Song S, Giddings TH Jr, Ro HS, Sakchaisri K, Park JE, Seong YS, Winey M, Lee KS; Mol Biol Cell. 2004;15:1711-1723. PMID:14767068

2: The budding yeast spindle pole body: structure, duplication, and function. Jaspersen SL, Winey M; Annu Rev Cell Dev Biol. 2004;20:1-28. PMID:15473833