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A fission yeast (Schizosaccharomyces pombe) gene encoding a member of the TIP41-like protein family was identified and characterized. Deletion of the fission yeast tip41 gene leads to slower growth when ammonium chloride is the nitrogen source, but the growth rate is not affected when adenine is the nitrogen source. The tip41 mutant cells also enter the G1 phase of the cell cycle earlier than wild-type cells in response to nitrogen starvation. Overexpression of tip41(+) causes cell death, spherical cell morphology and blocks the shift to G1 phase upon nitrogen starvation. Overexpression of tip41(+) increases the activity of type 2A phosphatase. In a ppa2 deletion strain with reduced PP2A activity, overexpression of tip41(+) no longer blocks the shift to G1 upon nitrogen starvation. These results suggest that fission yeast Tip41 plays a role in cellular responses to nitrogen nutrient conditions at least partly through regulation of type 2A phosphatase activity.
ATP-binding cassette transporter G1 (ABCG1) mediates cholesterol efflux onto lipidated apolipoprotein A-I and HDL and plays a role in various important physiological functions. However, the mechanism by which ABCG1 mediates cholesterol translocation is unclear. Protein palmitoylation regulates many functions of proteins such as ABCA1. Here we investigated if ABCG1 is palmitoylated and the subsequent effects on ABCG1-mediated cholesterol efflux. We demonstrated that ABCG1 is palmitoylated in both human embryonic kidney 293 cells and in mouse macrophage, J774. Five cysteine residues located at positions 26, 150, 311, 390 and 402 in the NH2-terminal cytoplasmic region of ABCG1 were palmitoylated. Removal of palmitoylation at Cys311 by mutating the residue to Ala (C311A) or Ser significantly decreased ABCG1-mediated cholesterol efflux. On the other hand, removal of palmitoylation at sites 26, 150, 390 and 402 had no significant effect. We further demonstrated that mutations of Cys311 affected ABCG1 trafficking from the endoplasmic reticulum. Therefore, our data suggest that palmitoylation plays a critical role in ABCG1-mediated cholesterol efflux through the regulation of trafficking.
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