carboxylase

(redirected from Carboxylases)
Also found in: Dictionary, Encyclopedia.

carboxylase

 [kahr-bok´sĭ-lās]
an enzyme that catalyzes the removal of carbon dioxide from the carboxyl group of alpha amino keto acids.

car·box·yl·ase

(kar-bok'sil-ās),
1. One of several carboxy-lyases, trivially named carboxylases or decarboxylases, 4.1.1.x), catalyzing the addition of CO2 to all or part of another molecule to create an additional -COOH group (for example, ribulose-1,5-bisphosphate carboxylase).
2. Name occasionally applied to pyruvate decarboxylase.

car·box·yl·ase

(kahr-bok'sil-ās)
One of several carboxylyases catalyzing the addition of CO2 to another molecule to create an additional -COOH group.

carboxylase

an enzyme that assists in the CARBOXYLATION or decarboxylation of a SUBSTRATE (3).
References in periodicals archive ?
Acetyl-CoA carboxylase catalyzes the conversion of acetyl-CoA into malonyl-CoA, which constitutes the initial reaction in fatty acid biosynthesis [26].
Sasaki, "Acetyl-CoA carboxylase in higher plants: most plants other than gramineae have both the prokaryotic and the eukaryotic forms of this enzyme," Plant & Cell Physiology, vol.
Dormann, "Increased fatty acid production in potato by engineering of acetyl-CoA carboxylase," Planta, vol.
Suormala, "Multiple carboxylase deficiency: inherited and acquired disorders of biotin metabolism," International Journal for Vitamin and Nutrition Research, vol.
Physical and kinetic properties of photosynthetic PEP carboxylase in developing apple fruit.
Phosphoenolpyruvate carboxylase: A new era of structural biology.
Well-watered [right arrow] Moisture stressed [[Psi].sub.leaf] (MPa) -1.0 -1.9 -2.8 PS-[CO.sub.2] ([micro] 44 27 13 mol [m.sup.-2] [s.sup.-1]) PR-[O.sub.2] ([micro] mol 33 24 13 [m.sup.-2] [s.sup.-1]) Energy dissipation (%): PS 26 16 9 PR 20 14 9 Total 46 30 18 To what extent rubisco acts as carboxylase or oxygenase depends upon the relative concentrations of [CO.sub.2] and [O.sub.2] presented to the enzyme.
Another alternative route occurs at the end of glycolysis where a "malate shunt" (Amthor, 1994a) may bypass pyruvate kinase through production of malate from PEP by PEP carboxylase. The shunt is favored when ADP is in short supply.
Variations in [K.sub.m]([CO.sub.2]) of ribulose-1,5-bisphosphate carboxylase among grasses.
Among enzymes involved in lipogenesis, acetyl- coenzyme A carboxylase a (ACACA) has been considered for its special regulatory role in fatty acid biosynthesis by catalyzing the ATP-dependent formation of malonyl-coenzyme A (Cronan and Waldrop, 2002; Badaoui et al., 2007; Garcia -fernandez et al, 2010).
Human acetyl-CoA carboxylase: characterization molecular cloning, and evidence for two isoforms.
Goat acetyl-coenzyme A carboxylase alpha: molecular characterization, polymorphism, and association with milk traits.