scholarly journals Management of Ornithine Carbamoyltransferase Deficiency with Underlying Hyperammonia Hyperinsulinemia Syndrome

2019 ◽  
Vol 20 ◽  
pp. 1085-1088
Author(s):  
Neer Dhillon ◽  
Andrew Stevens
Keyword(s):  
Ornithine Carbamoyltransferase

scholarly journals The Global Arginine Regulator ArgR Controls Expression of argF in Pseudomonas syringae pv. phaseolicola but Is Not Required for the Synthesis of Phaseolotoxin or for the Regulated Expression of argK

2004 ◽  
Vol 186 (11) ◽  
pp. 3653-3655 ◽  
Author(s):  
José Luis Hernández-Flores ◽  
Karina López-López ◽  
Rogelio Garcidueñas-Piña ◽  
Alba E. Jofre-Garfias ◽  
Ariel Alvarez-Morales
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Pseudomonas Syringae ◽  
Ornithine Carbamoyltransferase ◽  
Regulated Expression

ABSTRACT In Pseudomonas syringae pv. phaseolicola the enzyme ornithine carbamoyltransferase (OCTase), encoded by argF, is negatively regulated by argR, similar to what has been reported for Pseudomonas aeruginosa. However, production of the phaseolotoxin-resistant OCTase encoded by argK, synthesis of phaseolotoxin, and infectivity for bean pods occur independently of the ArgR protein.

scholarly journals Glutamine metabolism in chick enterocytes: absence of pyrroline-5-carboxylase synthase and citrulline synthesis

1995 ◽  
Vol 306 (3) ◽  
pp. 717-721 ◽  
Author(s):  
G Wu ◽  
N E Flynn ◽  
W Yan ◽  
D G Barstow
Keyword(s):  
Glutamine Metabolism ◽  
Nutritional Requirement ◽  
Ornithine Carbamoyltransferase ◽  
No Formation ◽  
Weaning Pig ◽  
Citrulline Synthesis ◽  
Metabolic Basis ◽  
Endogenous Synthesis ◽  
Positive Controls ◽  
In Cells

This study was designed to determine whether pyrroline-5-carboxylate (P-5-C) synthase is deficient in chick enterocytes therefore resulting in the lack of synthesis of ornithine and citrulline from glutamine. Post-weaning pig enterocytes, which are known to contain P-5-C synthase and to synthesize both ornithine and citrulline from glutamine, were used as positive controls. Enterocytes were incubated at 37 degrees C for 0-30 min in the presence of 2 mM [U-14C]glutamine or 2 mM ornithine plus 2 mM NH4Cl. In chick enterocytes, glutamine was metabolized to NH3, CO2, glutamate, alanine and aspartate, but not to ornithine, citrulline, arginine or proline. Likewise, there was no formation of citrulline, arginine, alanine or aspartate from ornithine in chick enterocytes. Furthermore, the rate of conversion of ornithine into proline in chick enterocytes was only about 4% of that in cells from pigs. To elucidate the reason for the inability of chick enterocytes to synthesize ornithine and citrulline from glutamine, the activities of the enzymes involved were measured. No activity of P-5-C synthase or ornithine carbamoyltransferase was found in chick enterocytes, in contrast with cells from post-weaning pigs. It was also demonstrated that the activity of ornithine aminotransferase in chick enterocytes was only 3% of that in cells from pigs. Thus the present findings elucidate the biochemical reason for the lack of endogenous synthesis of ornithine and citrulline in chicks. Our results also explain previous observations that ornithine cannot replace arginine or proline in the diet of chicks. We suggest that the absence of P-5-C synthase and ornithine carbamoyltransferase in enterocytes is the metabolic basis for the nutritional requirement of arginine in the chick.

Transport of the Precursor for Rat-Liver Ornithine Carbamoyltransferase into Mitochondria in vitro

2005 ◽  
Vol 122 (3) ◽  
pp. 501-509 ◽  
Author(s):  
Tetsuo MORITA ◽  
Satoshi MIURA ◽  
Masataka MORI ◽  
Masamiti TATIBANA
Keyword(s):  
Rat Liver ◽  
Ornithine Carbamoyltransferase
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