Assembly factor of SCF (SKP1-CUL1-F-box protein) E3 ubiquitin ligase complexes that promotes the exchange of the substrate-recognition F-box subunit in SCF complexes, thereby playing a key role in the cellular repertoire of SCF complexes. Acts as a F-box protein exchange factor when interacting with candA-C (By similarity). Interacts with candA-C. Interacts with unneddylated cullins culA and culD; interaction occurs only when complexed with candA-C. Requires candA-C for nuclear localization. Cells show a dark red color when grown on an air-medium interface that induces development. Cells are able to initiate the cycle but are blocked in the initial stage of early nest formation. Cells exhibit reduction in asexual development and block in sexual development. In E.nidulans, CAND1 is separated into 2 distinct proteins: candA-N and candA-C (AC Q5BAH2), corresponding to the N- and C-termini respectively of the protein in other species.