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L-Pro
D-Pro
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
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L-proline
D-proline
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L-proline
D-proline
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L-proline
D-proline
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r
L-proline
D-proline
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L-proline
D-proline
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L-proline
D-proline
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L-proline
D-proline
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L-proline
D-proline
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the simplest mechanism for ProR isomerization of L-Pro to D-Pro entails the Cys130/Cys300 dyad in the thiolate/thiol forms, respectively, while His132 and Asp296 are in their neutral and carboxylate forms, in this scheme Cys130 is deprotonated either by a water molecule or an initially neutral form of the amine moiety of the substrate, thus, His132 and Asp296 do not serve a catalytic acid-base role in the racemization step but interact tightly with the ammonium moiety of the substrate, the ProR catalytic cycle involves 2 proton-transfer reactions in either direction of the racemization
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a free and intact active site of the enzyme is necessary to allow mitogenicity
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a free and intact active site of the enzyme is necessary to allow mitogenicity
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TcPRACB: no reaction with L-hydroxyproline
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TcPRACB: no reaction with L-hydroxyproline
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TcPRACB: no reaction with L-hydroxyproline
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quantum mechanical and molecular mechanical study reveals two almost isoenergetic minima M1a and M2a, in which the enzyme is bound to L-proline and D-proline, respectively, and a transition state TSCa, unveiling a highly asynchronous concerted process. Residues Asn133, Asp296, and Gly301 destabilize M2a. Conversely, both Gly131 and Gly303 stabilize M2a. Residues Gly131, Gly301, and Thr302 stabilize TSCa
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additional information
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quantum mechanical and molecular mechanical study reveals two almost isoenergetic minima M1a and M2a, in which the enzyme is bound to L-proline and D-proline, respectively, and a transition state TSCa, unveiling a highly asynchronous concerted process. Residues Asn133, Asp296, and Gly301 destabilize M2a. Conversely, both Gly131 and Gly303 stabilize M2a. Residues Gly131, Gly301, and Thr302 stabilize TSCa
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pyrrole-2-carboxylic acid
(E)-4-oxopent-2-enoic acid
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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
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an irreversible strong competitive inhibitor, which hampers Trypanosoma cruzi intracellular differentiation and fate in mammalian host cells
2-pyrrolecarboxylic acid
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4-bromopyrazole-3-carboxylic acid
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4-chloro-5-methyl-pyrazole-3-carboxylic acid
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4-chloropyrazole-3-carboxylic acid
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4-ethylpyrazole-3-carboxylic acid
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pyrazole-3-carboxylic acid
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pyrrole-2-carboxylic acid
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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
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synthesized soluble pyrazole derivatives prove to be weak or inactive TcPRAC inhibitors
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pyrrole-2-carboxylic acid
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pyrrole-2-carboxylic acid
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pyrrole-2-carboxylic acid
PYC, competitive inhibitor
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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
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proline racemase is an effective mitogen for B cells, thus contributing to the parasites immune evasion and persistence in the human host
physiological function
proline racemase participates in mechanisms of virulence acquisition
physiological function
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proline racemase is a T-cell-independent B-cell mitogen, stimulation of murine splenocytes with recombinant proline racemase C induces B-cell proliferation, antibody secretion, interleukin-10 production, and upregulation of CD69 and CD86 on B cells
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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
brenda
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
brenda
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
brenda
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)
brenda
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
brenda
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
brenda
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
brenda
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
brenda
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
brenda
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
brenda
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)
brenda