Is aconitase present in mitochondria?
Aconitase has been found in both cytosol and mitochondria.
What is mitochondrial aconitase?
Mitochondrial aconitase is a citric acid cycle enzyme responsible for the citrate-isocitrate conversion. An isoform in the cytoplasm performs an analogous reaction. Mitochondrial aconitase is highly sensitive to superoxide, peroxynitrite and H2O2.
What is aconitase made of?
It consists of 21 amino acids and the iron-sulfur cluster. The Fe-S cluster is bound to aconitase via three cysteines from domain 3: cys358, cys421, and cys 424 (11). In its inactive form, the cluster is a [3Fe-4S] cluster, with each iron molecule ligated to cysteine.
Why is aconitase stereospecific?
Aconitase performs a classic stereospecific reaction that is often used as an example in biochemistry textbooks. It extracts a hydroxyl group and a specific hydrogen atom from citrate, and replaces them in a geometrically precise way to form isocitrate.
What type of enzyme is aconitase?
Mitochondrial aconitase is a citric acid cycle enzyme responsible for the citrate-isocitrate conversion. An isoform in the cytoplasm performs an analogous reaction.
What type of reaction is aconitase?
Aconitase from pig (PDB 7acn) is a single polypeptide (Mr 83kD) that catalyzes the reversible isomerization of citrate and isocitrate. It is the second enzyme in the Citric acid cycle, which is a series of enzyme-catalysed chemical reactions that is crucial to aerobic cellular respiration and the production of ATP.
What kind of enzyme is aconitase?
What enzyme class is aconitase?
Aconitase is an enzyme of the tricarboxylic acid cycle that catalyzes the conversion of citrate to isocitrate.
Does aconitase have cofactor?
The (4Fe-4S) cofactor is held in place by three sulfur atoms belonging to the cysteins-385, -448, and -451 which are bound to three of the four cluster iron atoms. On activation of the enzyme, a fourth iron atom is included in the cluster together with a water molecule.
What type of reaction is catalyzed by aconitase?
What kind of cofactor does aconitase use?
Catalytic mechanism of mitochondrial ACO The (4Fe-4S) cofactor is held in place by three sulfur atoms belonging to the cysteins-385, -448, and -451 which are bound to three of the four cluster iron atoms. On activation of the enzyme, a fourth iron atom is included in the cluster together with a water molecule.
What is the function of synthetase?
Introduction. Aminoacyl-tRNA synthetases (ARSs) are generally considered as “housekeepers” involved in protein synthesis, whose primary function is to catalyze the aminoacylation of transfer RNAs (tRNAs).
What type of enzymes are synthetases?
Synthases/synthetases are ligase enzymes within the E.C. 6 class. They are involved in synthetic reactions and catalyze the joining of two molecules with concomitant hydrolysis of the diphosphate bond in ATP or a similar triphosphate.