The glycosylphosphatidylinositol (GPI) transamidase complex catalyzes the attachment of GPI anchors to eukaryotic proteins in the lumen of endoplasmic reticulum. The Saccharomyces cerevisiae GPI transamidase complex consists of the subunits yPIG-K (Gpi8p), yPIG-S (Gpi17p), yPIG-T (Gpi16p), yPIG-U (CDC91/GAB1) and yGPAA1. We present the production of the two recombinant proteins yGPAA170-247 and yGPAA170-339 of the luminal domain of S. cerevisiae GPAA1, covering the amino acids 70-247 and 70-339, respectively. The secondary structural content of the stable and monodisperse yGPAA170-247 has been determined to be 28% alpha-helix and 27% beta-sheet. Small angle X-ray scattering (SAXS) data showed that yGPAA170-247 has a radius of gyration (Rg) 2.72 +/- 0.025 nm and maximum dimension (Dmax) of 9.14 nm. These data enabled the determination of the two domain low-resolution solution structure of yGPAA170-247. The large elliptical shape of yGPAA170-247 is connected via a short stalk to the smaller hook-like domain of 0.8 nm in length and 3.5 nm in width. The topological arrangement of yGPAA170-247 will be discussed together with the recently determined low resolution structures of yPIG-K24-337 and yPIG-S38-467 from S. cerevisiae in the GPI transamidase complex.
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|Evidence ID||Analyze ID||Gene||Gene Systematic Name||Phenotype||Experiment Type||Experiment Type Category||Mutant Information||Strain Background||Chemical||Details||Reference|
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