(A) Wild-type (A2587), lte1Δ (A24807), bub2Δ (A23045), kin4Δ (A17865), lte1Δ bub2Δ (A24808) and lte1Δ kin4Δ (A24806) cells were spotted on YePAD plates and incubated at 30°C and 16°C. Pictures shown represent growth from 2 days for the 30°C condition and 10 days for 16°C. The first spot represents growth of approximately 3×10⁴ cells and each subsequent spot is a 10 fold serial dilution.
(B) Cells in (A) were arrested in G1 with 5 µg/mL α factor and released into pheromone free media at room temperature. After 70 minutes, 10 µg/mL α factor was added to prevent entry into the subsequent cell cycle. Cells were collected every 15 minutes and stained for tubulin by indirect immuno-fluorescence and for the DNA with DAPI. Anaphase was determined by spindle and nuclear morphology. n ≥ 100 cells.

(A) The amino acid sequence of Kin4 and its orthologs were aligned using T-Coffee and the alignment score was plotted against the amino acid position. The three major regions of conservation are labeled i, ii and iii with the amino acid positions marked.
(B) Wild-type (A2587), bub2Δ (A1863), pGAL1-10-GFP-KIN4 (A11997), pGAL1-10-GFP-KIN4 bub2Δ (A18792), pGAL1-10-GFP-kin4(1–341) (A23250) and pGAL1-10-GFP- kin4(1–341) bub2Δ (A24113) cells were spotted on plates containing either glucose or galactose and raffinose as in Figure 1A.
(C) dyn1Δ (A17349), dyn1Δ kin4Δ (A17351), dyn1Δ kin4(1–341) (A22262) and dyn1Δ kin4-T209A (A22736) were grown at 14°C for 24 hours. Cells were stained as in Figure 1B. n ≥ 100 cells per sample. Error bars represent SEM.

(A) Cells expressing an mCherry-Tub1 fusion protein and Kin4-GFP (A19900) or kin4(1–654)-GFP (A21575) or kin4(655–800)-GFP (A21576) were grown to exponential phase and imaged live. The deconvolved GFP signal shown is from 8–10 serial sections. Kin4-GFP is shown in green, mCherry-Tub1 in red. Arrowheads indicate the position of the mother SPB.
(B) Cells expressing kin4-F793A-GFP and mCherry-Tub1 (A21556) were analyzed as in (A).
(C) Cells from (A) and (B) were analyzed over a single cell cycle as described in Figure 1B. Samples were taken at 60, 75, 90 and 105 minutes post release and imaged live. Serial sections spanning the entire cell were collected to ensure imaging of all spindle poles. Loading of Kin4 to the SPBs was judged by co-localization of Kin4-GFP with the ends of the anaphase spindle. n ≥ 100 cells and error bars represent SEM.
(D) dyn1Δ (A17349), dyn1Δ kin4Δ (A17351), dyn1Δ kin4(1–654) (A22263) and dyn1Δ kin4-F793A (A21298) were analyzed as in Figure 2C.
(E) Cells expressing mCherry-Tub1 and kin4(Δ503–511)-GFP (A21555) or Kin4-S508A (A21557) were analyzed as in (A).
(F) Cells expressing mCherry-Tub1 and Kin4-GFP (A19900), kin4(Δ503–511)-GFP (A21555) or Kin4-S508A-GFP (A21557) were lysed and analyzed for expression of the Kin4 fusion protein by western blot analysis. Kar2 was used as a loading control.

(A) Wild-type (A2587) and KIN4-S508A (A21299) cells were analyzed as in Figure 1B.
(B) Cells expressing a URL-3HA-Lte1 fusion protein (A23686) from the galactose inducible promoter were grown in YePA + 2% raffinose + 2% galactose (YePA+RG) to exponential phase. 2% glucose was added to the media at time = 0 to repress the GAL promoter and samples were collected for western blot analysis. Kar2 was used as a loading control.
(C) pGAL1-10-URL-3HA-LTE1 (LTE1-deg) (A23686), spo12Δ (A4874) and LTE1-deg spo12Δ (A24543) cells were spotted on plates containing either glucose or galactose and raffinose as in Figure 1A.
(D) Wild-type (A2587), KIN4-S508A (A21299), LTE1-deg (A23686) and KIN4-S508A LTE1-deg (A24084) cells were analyzed as in (C).
(E) Cells in (D) were grown as in (B) and samples were collected and analyzed for spindle and nuclear morphology as in Figure 1B.
(F) Cells expressing either Kin4-3HA (A11779), Kin4-S508A-3HA (A20608) or kin4-T209A-3HA (A22119) were grown to exponential phase and arrested with 15 µg/mL nocodazole for 2 hours. Kin4 associated kinase activity (top, Kin4 kinase), immunoprecipitated Kin4-3HA (second row, Kin4 (IP)), total amount of Kin4-3HA in extracts (third row, Kin4 (input)) and the amount of Bfa1 substrate (as monitored by Coomassie stain) added to the kinase reaction (bottom, MBP-Bfa1) are shown. The band that is shown for Kin4 associated kinase activity and total Bfa1 substrate is the first major degradation product of MBP-Bfa1 as described in Maekawa et al., 2007 and was the dominant signal.
(G) dyn1Δ (A17349), dyn1Δ kin4Δ (A17351), and dyn1Δ KIN4-S508A (A21301) were analyzed as in Figure 2C.

(A) Cells expressing GFP tagged Kin4 and mCherry-Tub1 with the following genetic backgrounds: wild-type (A19900), KIN4-S508A (A21557), KIN4-S508A dyn1Δ (A23052), KIN4-S508A kar9Δ (A23051), KIN4-S508A clb4Δ (A23055), KIN4-S508A clb4Δ kar9Δ (A25794) and clb4Δ (A23249) were analyzed as in Figure 3C. n ≥ 100 cells and error bars represent SEM.
(B) Representative KIN4-S508A clb4Δ cells with symmetric Kin4 localization to the SPBs. The top cell shows an unequal SPB loading pattern whereas the bottom cells shows equal Kin4-GFP intensity at both SPBs. The deconvolved GFP signal shown is from 10 serial sections.

(A) Wild-type (A2587), LTE1-deg KIN4-S508A (A24084), LTE1-deg KIN4-S508A kar9Δ (A24816), LTE1-deg KIN4-S508A clb4Δ (A24086), LTE1-deg KIN4-S508A clb4Δ bub2Δ (A24346), KIN4-S508A clb4Δ (A24083) and LTE1-deg clb4Δ (A24085) cells were analyzed as in Figure 4C.
(B) Wild-type (A2587), LTE1-deg KIN4-S508A (A24084), LTE1-deg KIN4-S508A clb4Δ (A24086), LTE1-deg KIN4-S508A clb4Δ bub2Δ (A24346), KIN4-S508A clb4Δ (A24083) and LTE1-deg clb4Δ (A24085) cells were analyzed as in Figure 4E.
(C) Wild-type (A2587), kin4-SPC72(177–622) (kin4-SPB) (A24586), LTE1-deg (A23686), LTE1-deg kin4-SPB (A24587), LTE1-deg kin4-SPB bub2Δ (A24588), LTE1-deg KIN4-S508A clb4Δ (A24086), LTE1-deg kin4-SPB kar9Δ (A24817) and LTE1-deg kin4-SPB clb4Δ (A24858) cells were analyzed as in Figure 4C.
(D–E) Wild-type (A1828), LTE1-deg clb4Δ (A24805) and LTE1-deg KIN4-S508A clb4Δ (A24761) cells expressing a Tem1-3MYC fusion protein were grown as in Figure 4E. Cells were collected seven hours post glucose addition and stained for tubulin (green) and Tem1-3MYC (red) by indirect immuno-fluorescence and the DNA (blue) was stained with DAPI. Tem1 loading was judged by colocalization of Tem1-3MYC with the ends of the anaphase spindle. n ≥ 100 cells and error bars represent SEM.
(F) The zone model of SPOC function. See text for further details.