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Information on EC 5.1.1.4 - proline racemase and Organism(s) Trypanosoma cruzi and UniProt Accession Q4DA80

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EC Tree
     5 Isomerases
         5.1 Racemases and epimerases
             5.1.1 Acting on amino acids and derivatives
                5.1.1.4 proline racemase
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This record set is specific for:
Trypanosoma cruzi
UNIPROT: Q4DA80 not found.
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Word Map
The taxonomic range for the selected organisms is: Trypanosoma cruzi
The expected taxonomic range for this enzyme is: Bacteria, Eukaryota, Archaea
Reaction Schemes
Synonyms
proline racemase, tcprac, tvprac, prac1, tryprac, tcpraca, tcpracb, proline racemase a, more
SYNONYM
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
proline racemase
-
proline racemase A
-
TcPRACA
proline racemase
proline racemase B
-
Racemase, proline
-
-
-
-
TcPRAC
TcPRACB
isoform B
REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
L-proline = D-proline
show the reaction diagram
REACTION TYPE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
racemization
isomerization
-
-
SYSTEMATIC NAME
IUBMB Comments
proline racemase
-
CAS REGISTRY NUMBER
COMMENTARY hide
9024-09-3
-
SUBSTRATE
PRODUCT                       
REACTION DIAGRAM
ORGANISM
UNIPROT
COMMENTARY
(Substrate) hide
LITERATURE
(Substrate)
COMMENTARY
(Product) hide
LITERATURE
(Product)
Reversibility
r=reversible
ir=irreversible
?=not specified
L-Pro
D-Pro
show the reaction diagram
overexpression of TcPRAC leads to an increase in parasite differentiation into infective forms and its subsequent penetration into host cells. During infection of its mammalian host, the parasite secretes a proline racemase that contributes to parasite immune evasion by acting as a B-cell mitogen
-
-
?
L-proline
D-proline
show the reaction diagram
L-proline
D-proline
show the reaction diagram
additional information
?
-
NATURAL SUBSTRATE
NATURAL PRODUCT
REACTION DIAGRAM
ORGANISM
UNIPROT
COMMENTARY
(Substrate) hide
LITERATURE
(Substrate)
COMMENTARY
(Product) hide
LITERATURE
(Product)
REVERSIBILITY
r=reversible
ir=irreversible
?=not specified
L-Pro
D-Pro
show the reaction diagram
overexpression of TcPRAC leads to an increase in parasite differentiation into infective forms and its subsequent penetration into host cells. During infection of its mammalian host, the parasite secretes a proline racemase that contributes to parasite immune evasion by acting as a B-cell mitogen
-
-
?
L-proline
D-proline
show the reaction diagram
-
-
-
r
L-proline
D-proline
show the reaction diagram
additional information
?
-
COFACTOR
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
additional information
-
INHIBITOR
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
iodoacetamide
-
pyrrole-2-carboxylic acid
(E)-4-oxopent-2-enoic acid
-
an irreversible strong competitive inhibitor, which hampers Trypanosoma cruzi intracellular differentiation and fate in mammalian host cells
(E)-5-bromo-4-oxopent-2-enoic acid
-
an irreversible strong competitive inhibitor, which hampers Trypanosoma cruzi intracellular differentiation and fate in mammalian host cells
2-pyrrolecarboxylic acid
-
-
4-bromopyrazole-3-carboxylic acid
-
-
4-chloro-5-methyl-pyrazole-3-carboxylic acid
-
-
4-chloropyrazole-3-carboxylic acid
-
-
4-ethylpyrazole-3-carboxylic acid
-
-
pyrazole-3-carboxylic acid
-
-
pyrrole-2-carboxylic acid
-
inhibitor significantly affects parasite infection of Vero cells in vitro, inhibitor also hampers Trypanosoma cruzi intracellular differentiation, inhibitor reduces host cell invasion in Vero cells by Trypanososma cruzi in a dose-dependent manner, pre-treatment of the parasites with 1 mM of inhibitor does not lead to changes in their morphology and motility, but results in an up to 54% reduction in the percentage of parasitized cells and about 30% less parasites per cell when cultures are counted at day 4 after infection
additional information
-
synthesized soluble pyrazole derivatives prove to be weak or inactive TcPRAC inhibitors
-
KM VALUE [mM]
SUBSTRATE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
29
L-proline
pH 6.0, 37°C
75
L-proline
pH 6.0, 37°C
Ki VALUE [mM]
INHIBITOR
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
0.0036 - 0.0057
pyrrole-2-carboxylic acid
0.006 - 0.01
2-pyrrolecarboxylic acid
-
recombinant His-tagged enzyme, pH 6.0, 37°C
1
4-bromopyrazole-3-carboxylic acid
-
recombinant His-tagged enzyme, pH 6.0, 37°C
2
4-chloro-5-methyl-pyrazole-3-carboxylic acid
-
recombinant His-tagged enzyme, pH 6.0, 37°C
0.3
4-chloropyrazole-3-carboxylic acid
-
recombinant His-tagged enzyme, pH 6.0, 37°C
2
4-ethylpyrazole-3-carboxylic acid
-
recombinant His-tagged enzyme, pH 6.0, 37°C
2
pyrazole-3-carboxylic acid
-
recombinant His-tagged enzyme, pH 6.0, 37°C
pH OPTIMUM
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
6
-
assay at
TEMPERATURE OPTIMUM
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
pI VALUE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
4.5
isoelectric focusing
ORGANISM
COMMENTARY hide
LITERATURE
UNIPROT
SEQUENCE DB
SOURCE
LOCALIZATION
ORGANISM
UNIPROT
COMMENTARY hide
GeneOntology No.
LITERATURE
SOURCE
TcPRACB secretes the intracellular isoform of the enzyme. TcPRACA gene can generate both secreted and intracellular isoforms (by an alternative trans-splicing mechanism)
Manually annotated by BRENDA team
membrane-bound and secreted forms of enzyme are present upon differentiation of the parasite into non-dividing infective forms
Manually annotated by BRENDA team
-
TcPRAC localizes in the cytoplasm of intracellular amastigote forms of the parasite, near the flagellar pocket of the parasites
Manually annotated by BRENDA team
in replicative non-infective forms of Trypanosoma cruzi
Manually annotated by BRENDA team
GENERAL INFORMATION
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
evolution
phylogenetic and syntenic data support a single horizontal transference to a Trypanosoma ancestor of a prokaryotic proline racemase implicated in parasite evasion from host defences. TryPRAC homologues as single copy genes per haploid genome in 12 of 15 Trypanosoma species, including Trypanosoma cruzi and Trypanosoma cruzi marinkellei, Trypanosoma dionisii, Trypanosoma erneyi, Trypanosoma rangeli, Trypanosoma conorhini and Trypanosoma lewisi, all parasites of mammals. Polymorphisms in TcPRAC genes match Trypanosoma cruzi genotypes: TcI-TcIV and Tcbat have unique genes, while the hybrids TcV and TcVI contain TcPRACA and TcPRACB from parental TcII and TcIII, respectively. PRAC homologues are identified in trypanosomes from anurans, snakes, crocodiles, lizards, and birds. Most trypanosomes have intact PRAC genes. Trypanosoma rangeli possesses only pseudogenes, maybe in the process of being lost. Trypanosoma brucei, Trypanosoma congolense and their allied species, except the more distantly related Trypanosoma vivax, have completely lost PRAC genes. The genealogy of TryPRAC homologs supports an evolutionary history congruent with the Trypanosoma phylogeny
physiological function
proline racemase participates in mechanisms of virulence acquisition
evolution
phylogenetic and syntenic data support a single horizontal transference to a Trypanosoma ancestor of a prokaryotic proline racemase implicated in parasite evasion from host defences. TryPRAC homologues as single copy genes per haploid genome in 12 of 15 Trypanosoma species, including Trypanosoma cruzi and Trypanosoma cruzi marinkellei, Trypanosoma dionisii, Trypanosoma erneyi, Trypanosoma rangeli, Trypanosoma conorhini and Trypanosoma lewisi, all parasites of mammals. Polymorphisms in TcPRAC genes match Trypanosoma cruzi genotypes: TcI-TcIV and Tcbat have unique genes, while the hybrids TcV and TcVI contain TcPRACA and TcPRACB from parental TcII and TcIII, respectively. PRAC homologues are identified in trypanosomes from anurans, snakes, crocodiles, lizards, and birds. Most trypanosomes have intact PRAC genes. Trypanosoma rangeli possesses only pseudogenes, maybe in the process of being lost. Trypanosoma brucei, Trypanosoma congolense and their allied species, except the more distantly related Trypanosoma vivax, have completely lost PRAC genes. The genealogy of TryPRAC homologs supports an evolutionary history congruent with the Trypanosoma phylogeny
physiological function
MOLECULAR WEIGHT
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
40100
2 * 40100, TcPRACB, SDS-PAGE
45000
x * 45000, SDS-PAGE
45800
2 * 45800, TcPRACA, SDS-PAGE
80000
TCPRACA, gel filtration, non-denaturing PAGE
45000
-
1 * 45000, SDS-PAGE
SUBUNIT
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
?
x * 45000, SDS-PAGE
dimer
homodimer
homodimer
monomer
-
1 * 45000, SDS-PAGE
CRYSTALLIZATION (Commentary)
ORGANISM
UNIPROT
LITERATURE
best crystals are obtained by mixing 2-3 microliter of the protein solution with an equal volume of crystallization buffer (0.1 M ammonium acetate/50 mM tri-sodium citrate dihydrate, pH 5.6/15% w/v polyethylene glycol 4000), equilibrated over 1 ml of the same buffer
crystal structure analysis shows that TcPRACA is a homodimer, with each monomer folded in two symmetric alpha/beta subunits separated by a deep crevice. The structure of TcPRACA in complex with a transition-state analog, pyrrole-2-carboxylic acid, reveals the presence of one reaction center per monomer, with two Cys residues optimally located to perform acid/base catalysis through a carbanion stabilization mechanism
PROTEIN VARIANTS
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
C130S
mutation of the catalytic Cys residues abolishes the enzymatic activity but preserves the mitogenic properties of the protein
C300S
mutation of the catalytic Cys residues abolishes the enzymatic activity but preserves the mitogenic properties of the protein
TEMPERATURE STABILITY
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
80
10 min, inactivation
80
5 min, activity is abolished
STORAGE STABILITY
ORGANISM
UNIPROT
LITERATURE
-20°C, 50% glycerol or diluted in sodium acetate buffer, pH 6.0, activity is impaired
23°C, 0.5 M imidazole buffer, pH 8.0, 10 days, TcPRACA loses 84% of its activity
-20°C, 50% glycerol or diluted in sodium acetate buffer, pH 6.0, stable
-20°C, as ammonium sulfate precipitate, stable
23°C, 0.5 M imidazole buffer, pH 8.0, 10 days, TcPRACB is stable, TcPRACA loses 84% of its activity
PURIFICATION (Commentary)
ORGANISM
UNIPROT
LITERATURE
TcPRACA protein is purified with immobilized metal affinity chromatography on nickel columns. The active peak is further submitted to gel filtration chromatography at 2.5 ml/min in a Superdex200 26/60 column
cobalt metal-affinity resin column chromatography
-
recombinant His-tagged enzyme from Escherichia coli strain BL21(DE3) by nickel affinity chromatography
-
CLONED (Commentary)
ORGANISM
UNIPROT
LITERATURE
DNA and amino acid sequence determination and analysis, sequence comparisons and phylogenetic analysis, genotyping and genetic organization, detailed overview
TcPRACA is expressed in Escherichia coli BL21 (DE3)
the paralogous genes TcPRACA (A+) and TcPRACB (B++) are overexpressed in non-infective epimastigote forms using appropriate vectors to obtain stable chromosomal integration of these genes in sense and antisense orientations
DNA and amino acid sequence determination and analysis, sequence comparisons and phylogenetic analysis, genotyping and genetic organization, detailed overview
expressed in Escherichia coli BL21(DE3) cells
-
expression in Escherichia coli
recombinant expression of His-tagged enzyme in Escherichia coli strain BL21(DE3)
-
the paralogous genes TcPRACA (A+) and TcPRACB (B++) are overexpressed in non-infective epimastigote forms using appropriate vectors to obtain stable chromosomal integration of these genes in sense and antisense orientations
EXPRESSION
ORGANISM
UNIPROT
LITERATURE
2 paralogous copies of proline racemase genes are present per parasite haploid genome and they are differentially expressed during Trypanosoma cruzi development. Non-infective forms of the parasite expressing full length antisense TcPRACB RNA (functional knockdown) are not viable, whereas functional TcPRACA-knock down (A-) epimastigotes survive only poorly even under low selection pressure for recombinant parasites. Extracts from parasites overexpressing TcPRAC genes display more D-amino acid-containing peptides than wild type or knock down controls. The metacyclic form/epimastigote D-amino acid ratio obtained from parasites that developed in higher concentrations of proline (5.5) is greater than the metacyclic form/epimastigote D-amino acid ratio from wild type (2). Parasites overexpressing the intracytoplasmic isoform of proline racemase (B++) that has differentiated in 1x or 3x proline conditions display higher metacyclic form/epimastigote D-amino acid ratios than the respective wild type controls. Although they present a relative increase in metacyclic form/epimastigote D-amino acid ratios, overexpressors of the secreted version of TcPRAC (A+) show lower levels of D-amino acids than wild type or B++ parasites. Since TcPRACA transcripts appear to be more highly expressed at the end of metacyclogenesis, it is tempting to consider that racemisation of intracellular proline during this stage of development instead depends on the cytoplasmic version of the enzyme (TcPRACB)
2 paralogous copies of proline racemase genes are present per parasite haploid genome and they are differentially expressed during Trypanosoma cruzi development. Non-infective forms of the parasite expressing full length antisense TcPRACB RNA (functional knockdown) are not viable, whereas functional TcPRACA-knock down (A-) epimastigotes survive only poorly even under low selection pressure for recombinant parasites. Extracts from parasites overexpressing TcPRAC genes display more D-amino acid-containing peptides than wild type or knock down controls. The metacyclic form/epimastigote D-amino acid ratio obtained from parasites that developed in higher concentrations of proline (5.5) is greater than the metacyclic form/epimastigote D-amino acid ratio from wild type (2). Parasites overexpressing the intracytoplasmic isoform of proline racemase (B++) that has differentiated in 1x or 3x proline conditions display higher metacyclic form/epimastigote D-amino acid ratios than the respective wild type controls. Although they present a relative increase in metacyclic form/epimastigote D-amino acid ratios, overexpressors of the secreted version of TcPRAC (A+) show lower levels of D-amino acids than wild type or B++ parasites. Since TcPRACA transcripts appear to be more highly expressed at the end of metacyclogenesis, it is tempting to consider that racemisation of intracellular proline during this stage of development instead depends on the cytoplasmic version of the enzyme (TcPRACB)
in amastigote forms of the parasites, the intensity of anti-TcPRAC labeling varies according to the time post infection reaching the highest signal of TcPRAC expression after 48 h, while the number of intracellular parasites increases by amastigote multiplication
-
recombinant epimastigote parasites overexpressing TcPRAC genes coding for proline racemase present an augmented ability to differentiate into metacyclic infective forms and subsequently penetrate host-cells in vitro
-
APPLICATION
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
medicine
REF.
AUTHORS
TITLE
JOURNAL
VOL.
PAGES
YEAR
ORGANISM (UNIPROT)
PUBMED ID
SOURCE
Chamond, N.; Gregoire, C.; Coatnoan, N.; Rougeot, C.; Freitas-Junior, L.H.; da Silveira, J.F.; Degrave, W.M.; Minoprio, P.
Biochemical characterization of proline racemases from the human protozoan parasite Trypanosoma cruzi and definition of putative protein signatures
J. Biol. Chem.
278
15484-15494
2003
Trypanosoma cruzi (Q4DA80), Trypanosoma cruzi (Q868H8), Trypanosoma cruzi
Manually annotated by BRENDA team
Reina-San-Martin, B.; Degrave, W.; Rougeot, C.; Cosson, A.; Chamond, N.; Cordeiro-Da-Silva, A.; Arala-Chaves, M.; Coutinho, A.; Minoprio, P.
A B-cell mitogen from a pathogenic trypanosome is a eukaryotic proline racemase
Nat. Med.
6
890-897
2000
Trypanosoma cruzi (Q4DA80), Trypanosoma cruzi
Manually annotated by BRENDA team
Chamond, N.; Goytia, M.; Coatnoan, N.; Barale, J.C.; Cosson, A.; Degrave, W.M.; Minoprio, P.
Trypanosoma cruzi proline racemases are involved in parasite differentiation and infectivity
Mol. Microbiol.
58
46-60
2005
Trypanosoma cruzi (Q4DA80), Trypanosoma cruzi
Manually annotated by BRENDA team
Stenta, M.; Calvaresi, M.; Altoe, P.; Spinelli, D.; Garavelli, M.; Bottoni, A.
The Catalytic Activity of Proline Racemase: A Quantum Mechanical/Molecular Mechanical Study
J. Phys. Chem. B
112
1057-1059
2008
Trypanosoma cruzi, Trypanosoma cruzi (Q4DA80)
Manually annotated by BRENDA team
Buschiazzo, A.; Goytia, M.; Schaeffer, F.; Degrave, W.; Shepard, W.; Gregoire, C.; Chamond, N.; Cosson, A.; Berneman, A.; Coatnoan, N.; Alzari, P.M.; Minoprio, P.
Crystal structure, catalytic mechanism, and mitogenic properties of Trypanosoma cruzi proline racemase
Proc. Natl. Acad. Sci. USA
103
1705-1710
2006
Trypanosoma cruzi (Q4DA80), Trypanosoma cruzi
Manually annotated by BRENDA team
Rubinstein, A.; Major, D.T.
Catalyzing racemizations in the absence of a cofactor: the reaction mechanism in proline racemase
J. Am. Chem. Soc.
131
8513-8521
2009
Trypanosoma cruzi
Manually annotated by BRENDA team
Coutinho, L.; Ferreira, M.A.; Cosson, A.; Batista, M.M.; Batista, D.d.a..G.; Minoprio, P.; Degrave, W.M.; Berneman, A.; Soeiro Mde, N.
Inhibition of Trypanosoma cruzi proline racemase affects host-parasite interactions and the outcome of in vitro infection
Mem. Inst. Oswaldo Cruz
104
1055-1062
2009
Trypanosoma cruzi
Manually annotated by BRENDA team
Coatnoan, N.; Berneman, A.; Chamond, N.; Minoprio, P.
Proline racemases: Insights into Trypanosoma cruzi peptides containing D-proline
Mem. Inst. Oswaldo Cruz
104
295-300
2009
Trypanosoma cruzi (Q4DA80), Trypanosoma cruzi (Q868H8), Trypanosoma cruzi
Manually annotated by BRENDA team
Bryan, M.; Norris, K.
Genetic immunization converts the Trypanosoma cruzi B-cell mitogen proline racemase to an effective immunogen
Infect. Immun.
78
810-822
2010
Trypanosoma cruzi, Trypanosoma cruzi Y
Manually annotated by BRENDA team
Berneman, A.; Montout, L.; Goyard, S.; Chamond, N.; Cosson, A.; dArchivio, S.; Gouault, N.; Uriac, P.; Blondel, A.; Minoprio, P.
Combined approaches for drug design points the way to novel proline racemase inhibitor candidates to fight Chagas disease
PLoS ONE
8
e60955
2013
Trypanosoma cruzi
Manually annotated by BRENDA team
Caballero, Z.C.; Costa-Martins, A.G.; Ferreira, R.C.; P Alves, J.M.; Serrano, M.G.; Camargo, E.P.; Buck, G.A.; Minoprio, P.; G Teixeira, M.M.
Phylogenetic and syntenic data support a single horizontal transference to a Trypanosoma ancestor of a prokaryotic proline racemase implicated in parasite evasion from host defences
Parasit. Vectors
8
222
2015
no activity in Trypanosoma brucei, no activity in Trypanosoma congolense, Trypanosoma conorhini (A0A0F6YF18), Trypanosoma conorhini, Trypanosoma conorhini TCC025 (A0A0F6YF18), Trypanosoma cruzi (Q4DA80), Trypanosoma cruzi (Q868H8), Trypanosoma cruzi, Trypanosoma cruzi CL Brener (Q4DA80), Trypanosoma cruzi CL Brener (Q868H8), Trypanosoma cruzi marinkellei (A0A0F6VXD6), Trypanosoma cruzi marinkellei TCC344 (A0A0F6VXD6), Trypanosoma dionisii, Trypanosoma dionisii TCC211, Trypanosoma erneyi (A0A0F6VXE2), Trypanosoma erneyi TCC1946 (A0A0F6VXE2), Trypanosoma grayi, Trypanosoma grayi ANR4, Trypanosoma lewisi (A0A0F6VXM2), Trypanosoma lewisi, Trypanosoma lewisi TCC034 (A0A0F6VXM2), Trypanosoma rangeli, Trypanosoma serpentis (A0A0F6SCP6), Trypanosoma serpentis TCC1052 (A0A0F6SCP6), Trypanosoma sp. (A0A0F6VXD9), Trypanosoma sp. TCC1825 / RCF-2014 (A0A0F6VXD9), Trypanosoma sp. TCC339 (A0A0F6YER1), Trypanosoma sp. TCC878 (A0A0F6VXE6), Trypanosoma sp. TCC878 RCF-2014 (A0A0F6VXE6), Trypanosoma vivax (B8LFE4), Trypanosoma vivax, Trypanosoma vivax Y486 (B8LFE4)
Manually annotated by BRENDA team