In tem1Δ cells expressing a Bfa1-Tem1 fusion protein, Cdc15-3HA (red) loads prematurely onto spindle pole bodies during metaphase as determined by spindle morphology (tubulin, green) and nuclear morphology (DAPI, blue). The Bfa1-Tem1 fusion protein is constitutively and asymmetrically targeted to spindle pole bodies. Compare with control image CIL# 13864. Image is Fig 3C, bottom panels, in J Cell Biol. (2011) 192: 599-614. Images in Fig 3 include CIL# 13862, 13863, 13864, 13865, 13866, 13867.
Cells (MATa tem1::KanMX ura3::eGFP-BFA1–TEM1::URA3 cdc15::CDC15-3HA), grown in rich media with glucose, were fixed for 15 min in 3.7% formaldehyde and 0.1 M potassium phosphate buffer, pH 6.4. Cells were then washed twice with 0.1 M potassium phosphate buffer, pH 6.4, and resuspended in 1.2 M sorbitol in 0.12 M K2HPO4/0.033 M citric acid, pH 5.9. Fixed cells were digested with 0.1 mg/ml zymolyase-100T (US Biological) and 1/10 volume of glusulase (PerkinElmer) at 30C for 15 min, washed once, and resuspended in 1.2 M sorbitol in 0.12 M K2HPO4/0.033 M citric acid, pH 5.9. Primary antibodies were anti-HA monoclonal antibody (HA.11; 1:500) and anti-tubulin (Abcam; 1:500). Secondary antibodies were: anti-mouse Cy3 (for HA) and anti-rat FITC (for tubulin). Cells were resuspended in DAPI (1 mg/ml). Imaging was performed at 25C using a Leica DM6000 microscope equipped with a 100x/1.40 NA oil immersion objective lens, A4, L5, and TX2 filters, and a digital CCD camera (DFC350, Leica). Pictures were processed with LAS AF (leica) and ImageJ software.
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