During size-dependent cell cycle transitions controlled by the ubiquitous cyclin-dependent kinase Cdk1, Blt1 has been shown to co-localise with Cdr2 in the medial interphase nodes, as well as with Mid1 which was previously shown to localise to similar interphase structures. Physical interactions between Blt1-Mid1, Blt1-Cdr2 and Cdr2-Mid1 were detected, indicating that medial cortical nodes are formed by the ordered, Cdr2-dependent assembly of multiple interacting proteins during interphase. This domain show similarity to ubiquitin family proteins.

1: A spatial gradient coordinates cell size and mitotic entry in fission yeast. Moseley JB, Mayeux A, Paoletti A, Nurse P; Nature. 2009;459:857-860. PMID:19474789