Subcellular compartmentation in control of converging pathways for proline and arginine metabolism in Saccharomyces cerevisiae.
Enzymes of proline biosynthesis and proline degradation which act on the same compound, delta 1-pyrroline-5-carboxylate, are physically separated in yeast cells. The enzyme responsible for the final step in proline biosynthesis, pyrroline-5-carboxylate reductase, converts pyrroline-5-carboxylate to proline and is located in the cytoplasm. The last enzyme in the proline degradative pathway, pyrroline-5-carboxylate dehydrogenase, converts pyrroline-5-carboxylate to glutamate and is found in the particulate fraction of the cell, presumably in the mitochondrion. By subcellular compartmentation, yeast cells avoid futile cycling between proline and pyrroline-5-carboxylate.
D050842:1-Pyrroline-5-Carboxylate Dehydrogenase; D001120:Arginine / Q000378:metabolism; D002451:Cell Compartmentation; D003593:Cytoplasm / Q000201:enzymology; D008928:Mitochondria / Q000201:enzymology; D000587:Oxidoreductases Acting on CH-NH Group Donors / Q000378:metabolism*; D011392:Proline / Q000378:metabolism*; D011762:Pyrroline Carboxylate Reductases / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000201:enzymology*
D001120:Arginine; D011392:Proline; D050842:1-Pyrroline-5-Carboxylate Dehydrogenase; D000587:Oxidoreductases Acting on CH-NH Group Donors; D011762:Pyrroline Carboxylate Reductases