1 Cell-cycle dependent phosphorylation of yeast pericentrin regulates -TuSC- 2 mediated microtubule nucleation 3 4 Tien-chen Lin1,3, Annett Neuner1, Yvonne Schlosser1, Annette Scharf2, Lisa Weber2 and 5 Elmar Schiebel1,* 6 1-Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), DKFZ-ZMBH Allianz, 7 Im Neuenheimer Feld 282, 69120 Heidelberg, Germany 8 2-Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), DKFZ-ZMBH Allianz, 9 Z-MS, Im Neuenheimer Feld 282, 69120 Heidelberg, Germany 10 3-The Hartmut Hoffmann-Berling International Graduate School of Molecular and Cellular 11 Biology (HBIGS), University of Heidelberg, Heidelberg, 69120, Germany 12 13 *Correspondence:
[email protected] 14 Key words: pericentrin, Spc110, Spc98, spindle pole body, Mps1, Cdk1, gamma-tubulin 15 complex, phosphorylation, mitosis, microtubules, oligomerization 16 17 Summary 18 Budding yeast Spc110, a member of -tubulin complex receptor family (-TuCR), recruits - 19 tubulin complexes to microtubule (MT) organizing centers (MTOCs). Biochemical studies 20 suggest that Spc110 facilitates higher-order -tubulin complex assembly (Kollman et al., 21 2010). Nevertheless the molecular basis for this activity and the regulation are unclear. 22 Here we show that Spc110 phosphorylated by Mps1 and Cdk1 activates -TuSC 23 oligomerization and MT nucleation in a cell cycle dependent manner. Interaction between 24 the N-terminus of the -TuSC subunit Spc98 and Spc110 is important for this activity. 25 Besides the conserved CM1 motif in -TuCRs (Sawin et al., 2004), a second motif that we 26 named Spc110/Pcp1 motif (SPM) is also important for MT nucleation. The activating Mps1 27 and Cdk1 sites lie between SPM and CM1 motifs.