1-Pyrroline-5-carboxylic acid
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| MeSH | Delta-1-pyrroline-5-carboxylate |
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| Template:Longitem | C5H7NO2 |
| Molar mass | 113.115 g/mol |
| Acidity (pKa) | 1.82/6.07[1] |
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1-Pyrroline-5-carboxylic acid (systematic name 3,4-dihydro-2H-pyrrole-2-carboxylic acid[2]) is a cyclic imino acid. Its conjugate base and anion is 1-pyrroline-5-carboxylate (P5C). In solution, P5C is in spontaneous equilibrium with glutamate-5-semialdehyde (GSA).[3]
Biochemistry
The stereoisomer (S)-1-pyrroline-5-carboxylate (also referred to as L-P5C) is an intermediate metabolite in the biosynthesis and degradation of proline and arginine.[4][5][6]
In prokaryotic proline biosynthesis, GSA is synthesized from γ-glutamyl phosphate by the enzyme γ-glutamyl phosphate reductase. In most eukaryotes, GSA is synthesised from the amino acid glutamate by the bifunctional enzyme 1-pyrroline-5-carboxylate synthase (P5CS). The human P5CS is encoded by the ALDH18A1 gene.[7][8] The enzyme pyrroline-5-carboxylate reductase converts P5C into proline.
In proline degradation, the enzyme proline dehydrogenase produces P5C from proline, and the enzyme 1-pyrroline-5-carboxylate dehydrogenase converts GSA to glutamate. In many prokaryotes, proline dehydrogenase and P5C dehydrogenase form a bifunctional enzyme that prevents the release of P5C during proline degradation.[9]
A reciprocal regulation of delta 1-pyrroline-5-carboxylate synthetase (P5CS) and proline dehydrogenase genes controls proline levels during and after osmotic stress in plants proportional to the level of proline.[10] This allows an optimum level of proline to be produced from reduced nitrogen to control osmotic stress.
References
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