Information on EC 3.5.1.B15 - pyrazinamidase

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The expected taxonomic range for this enzyme is: Archaea, Bacteria

EC NUMBER
COMMENTARY hide
3.5.1.B15
preliminary BRENDA-supplied EC number
RECOMMENDED NAME
GeneOntology No.
pyrazinamidase
-
REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
pyrazinamide + H2O = pyrazinoic acid + NH3
show the reaction diagram
-
-
-
-
SYSTEMATIC NAME
IUBMB Comments
pyrazinamide amidohydrolase
-
CAS REGISTRY NUMBER
COMMENTARY hide
39419-71-1
-
ORGANISM
COMMENTARY hide
LITERATURE
UNIPROT
SEQUENCE DB
SOURCE
gene pncA
UniProt
Manually annotated by BRENDA team
GENERAL INFORMATION
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
metabolism
-
in Mycobacterium tuberculosis the enzyme converts the nicotinamide analogue prodrug pyrazinamide into the bacteriostatic pyrazinoic acid
physiological function
-
the reaction product pyrazinoic acid inhibits Mycobacterium tuberculosis type I fatty acid synthase, represses mycolic acid biosynthesis, and appears to affect membrane energetics and acidification of the cytoplasm
additional information
SUBSTRATE
PRODUCT                       
REACTION DIAGRAM
ORGANISM
UNIPROT
COMMENTARY
(Substrate) hide
LITERATURE
(Substrate)
COMMENTARY
(Product) hide
LITERATURE
(Product)
Reversibility
r=reversible
ir=irreversible
?=not specified
nicotinamide + H2O
nicotinate + NH3
show the reaction diagram
pyrazinamide + H2O
pyrazinic acid + NH3
show the reaction diagram
pyrazinamide + H2O
pyrazinoic acid + NH3
show the reaction diagram
NATURAL SUBSTRATES
NATURAL PRODUCTS
REACTION DIAGRAM
ORGANISM
UNIPROT
COMMENTARY
(Substrate) hide
LITERATURE
(Substrate)
COMMENTARY
(Product) hide
LITERATURE
(Product)
REVERSIBILITY
r=reversible
ir=irreversible
?=not specified
nicotinamide + H2O
nicotinate + NH3
show the reaction diagram
pyrazinamide + H2O
pyrazinic acid + NH3
show the reaction diagram
pyrazinamide + H2O
pyrazinoic acid + NH3
show the reaction diagram
METALS and IONS
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
Mn2+
-
activates
Zn2+
-
activates, best cation, the active site Cys159 is located at the N-terminus of a6 at one side of the active site with the Zn2+ ion positioned on the other side. The metal ion is bound tightly in the AbPncA active site
additional information
-
PncA is a divalent cation-dependent enzyme
INHIBITORS
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
KM VALUE [mM]
SUBSTRATE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
0.41
Pyrazinamide
pH 7.5, 60°C
TURNOVER NUMBER [1/s]
SUBSTRATE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
135.7
Pyrazinamide
Acidilobus saccharovorans
D9Q1R5
pH 7.5, 60°C
kcat/KM VALUE [1/mMs-1]
SUBSTRATE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
331
Pyrazinamide
Acidilobus saccharovorans
D9Q1R5
pH 7.5, 60°C
3666
pH OPTIMUM
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
TEMPERATURE OPTIMUM
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
MOLECULAR WEIGHT
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
39700
dimeric enzyme, gel filtration
47000
-
gel filtratrion and analytical ultracentrifugation
SUBUNITS
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
homodimer
monomer
Crystallization/COMMENTARY
ORGANISM
UNIPROT
LITERATURE
crystal structure (PDB ID 2WT9) analysis, and modeling of substrate binding and unbinding, overview
TEMPERATURE STABILITY
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
Purification/COMMENTARY
ORGANISM
UNIPROT
LITERATURE
recombinant enzyme from Escherichia coli strain BL21(DE3)pLysS by nickel affinity chromatography, ultrafiltration, and gel filtration
Cloned/COMMENTARY
ORGANISM
UNIPROT
LITERATURE
expressed in Escherichia coli
gene pncA, DNA and amino acid sequence determination and analysis, recombinant enzyme expression in Escherichia coli strain BL21(DE3)pLysS