Effect of temperature on Sec14 and Sec14 ^G266D protein levels.

Abstract

<p><i>A</i>, the <i>sec14^ts</i> cells were transformed with a plasmid expressing Sec14 containing an N-terminal T7 epitope, untagged Sec14, or empty vector. <i>SEC14</i> expression was driven by the constitutive <i>GPD1</i> promoter. Cells were grown in solution at 25°C to mid-logarithmic phase, and serial dilutions of identical numbers of cells were spotted onto plates and incubated at 37°C for two days. <i>B</i>, cells expressing T7-Sec14 or Sec14^G266D were grown to mid-logarithmic phase at 25°C, with a subset shifted to 37°C for 2 hrs. Cells were disrupted by three passes through a French press and membranes were separated from soluble proteins by differential centrifugation. Proteins in each fraction were separated by SDS-PAGE, transferred to PVDF membrane, and western blots were performed. In the blots shown 10 fold more protein extract was loaded in each Sec14^G266D lane compared to extracts containing wild type Sec14 for blots versus the T7 epitope due to protein expression level differences.</p