3.1.3.21 metabolism Rv1692 is the final enzyme involved in glycerophospholipid recycling/catabolism -, 730818 3.1.3.21 physiological function Pyp1 activity is important for yeast to maintain phosphoglucose isomerase activity in the presence of environmental sugar alcohols. Pyp1 expression is strongly positively correlated with yeast growth rate. Deletion of Pyp1 leads to accumulation of octulose-8-phosphate, ribitol-5-phosphate, and erythritol-4-phosphate 749467