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 [1]. The pericentrin homologue Pcp1 is also associated with the fungal centrosome or spindle pole body (SPB) [2]. 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 [3]. 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 [4].

1: Identification and characterization of two novel proteins affecting fission yeast gamma-tubulin complex function. Venkatram S, Tasto JJ, Feoktistova A, Jennings JL, Link AJ, Gould KL; Mol Biol Cell 2004;15:2287-2301. PMID:15004232

2: Pcp1p, an Spc110p-related calmodulin target at the centrosome of the fission yeast Schizosaccharomyces pombe. Flory MR, Morphew M, Joseph JD, Means AR, Davis TN; Cell Growth Differ. 2002;13:47-58. PMID:11864908

3: Microtubule nucleation at non-spindle pole body microtubule-organizing centers requires fission yeast centrosomin-related protein mod20p. Sawin KE, Lourenco PC, Snaith HA; Curr Biol. 2004;14:763-775. PMID:15120067

4: Proper recruitment of gamma-tubulin and D-TACC/Msps to embryonic Drosophila centrosomes requires Centrosomin Motif 1. Zhang J, Megraw TL; Mol Biol Cell. 2007;18:4037-4049. PMID:17671162