Abstract
In this article we review recent work on the physiology of proline and Δ1-pyrroline-5-carboxylate (P5C) in living organisms and consider recent progress in our understanding of the role of P5C synthetase in collagen metabolism and the regulation of urea cycle in vertebrates. Much of this recent progress has been made possible by advances in our knowledge of the enzymes and genes involved in proline biosynthesis in man. The availability of well characterized P5C synthetase deficiency in man has been an impetus for the cloning of the cDNA encoding for this enzyme from man and facilitated the establishment of the phenotype-genotype relationships in P5C synthetase deficiency in higher vertebrates.
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