Proline degradation

Stable Identifier
R-OSA-1119337
Type
Pathway
Species
Oryza sativa
Compartment
Synonyms
proline utilization, pathway99539
Locations in the PathwayBrowser
Summation

High concentrations of proline in the cell increase reactive oxygen species (ROS) formation in the mitochondrion. Proline catabolism is repressed under osmotic stress but once the stress is withdrawn, proline is oxidized to ?1-pyrroline-5-carboxylic acid (P5C) by proline dehydrogenase (PDH; EC 1.5.99.8), also known as proline oxidase, the first enzyme in the proline degradation pathway. P5C is then converted back to glutamate by the enzyme P5C dehydrogenase (P5CDH; 1.5.1.12) (Forlani et al., 1997). Thus, both PDH and P5CDH form two important enzymes in the degradation of proline to glutamate in higher organisms. During the recovery from stress, this short catabolic pathway provides energy, reducing power and precursors for nucleotide synthesis to allow the resumption of cell division (Hare and Cress, 1997).

Data source: RiceCyc

Literature References
PubMed ID Title Journal Year
25150410 RNAi-directed downregulation of betaine aldehyde dehydrogenase 1 (OsBADH1) results in decreased stress tolerance and increased oxidative markers without affecting glycine betaine biosynthesis in rice (Oryza sativa) Plant Mol. Biol. 2014
9106509 Characterization of the gene for delta1-pyrroline-5-carboxylate synthetase and correlation between the expression of the gene and salt tolerance in Oryza sativa L Plant Mol. Biol. 1997
25599829 Creation of fragrant rice by targeted knockout of the OsBADH2 gene using TALEN technology Plant Biotechnol. J. 2015
11027709 Expression of a gene encoding mitochondrial aldehyde dehydrogenase in rice increases under submerged conditions Plant Physiol. 2000
26347750 Connecting proline metabolism and signaling pathways in plant senescence Front Plant Sci 2015
12832071 Induction of mitochondrial aldehyde dehydrogenase by submergence facilitates oxidation of acetaldehyde during re-aeration in rice FEBS Lett. 2003
12609740 Organ-specific expressions and chromosomal locations of two mitochondrial aldehyde dehydrogenase genes from rice (Oryza sativa L.), ALDH2a and ALDH2b Gene 2003
26217357 Role of proline and pyrroline-5-carboxylate metabolism in plant defense against invading pathogens Front Plant Sci 2015
24001856 Comparative quantitative analysis of headspace volatiles and their association with BADH2 marker in non-basmati scented, basmati and non-scented rice (Oryza sativa L.) cultivars of India Food Chem 2014
26300893 Functional characterization and expression analysis of rice ?(1)-pyrroline-5-carboxylate dehydrogenase provide new insight into the regulation of proline and arginine catabolism Front Plant Sci 2015
26258482 Resequencing Reveals Different Domestication Rate for BADH1 and BADH2 in Rice (Oryza sativa) PLoS ONE 2015
Participants
Participant Of
Event Information
Go Biological Process
Orthologous Events
Cross References
RiceCyc