This domain has been identified in two microtubule associated proteins in Schizosaccharomyces pombe, Mto1 and Pcp1. Mto1 has been identified in association with spindle pole body and non-spindle pole body microtubules. The pericentrin homolog Pcp1 is also associated with the fungal centrosome or spindle pole body (SPB). Members of this family have been named centrosomins, and are an essential mitotic centrosome component required for assembly of all other known pericentriolar matrix proteins in order to achieve microtubule-organising activity in fission yeast. Cnn_1N is a short conserved motif towards the N-terminus. Motif 1 is found to be necessary for proper recruitment of gamma-tubulin, D-TACC (the homolog of vertebrate transforming acidic coiled-coil proteins [TACC]), and Minispindles (Msps) to embryonic centrosomes but is not required for assembly of other centrosome components including Aurora A kinase and CP60 in Drosophila.