| 1994 |
The ENO gene of P. falciparum was molecularly characterized: it encodes a 446-amino-acid protein (48.7 kDa) mapping to chromosome 10, with all residues implicated in substrate/cofactor binding and catalysis conserved. A plant-like 5-amino-acid insertion unique to plasmodial and plant enolases was identified in the sequence, pointing to photosynthetic ancestry. |
cDNA sequencing, inverse-PCR, gene mapping |
European journal of biochemistry |
Medium |
8125109
|
| 2004 |
Recombinant P. falciparum ENO was expressed and purified in active form; kinetic characterization showed it is a homodimer (~100 kDa by gel filtration), with specific activity ~30 U/mg, Km(2-PGA) = 0.041 mM, Km(PEP) = 0.25 mM, optimal pH 7.4–7.6, inhibited by Na+, activated by K+, and with apparent Mg2+ activation constant of 0.18 mM (inhibitory at higher concentrations). |
Recombinant protein expression, gel filtration, enzyme kinetics, in vitro assay |
European journal of biochemistry |
High |
15606772
|
| 2007 |
P. falciparum ENO localizes to the merozoite cell surface, as demonstrated by immunofluorescence and electron microscopy. Anti-recombinant ENO antibodies inhibited in vitro parasite growth, and immunization with recombinant ENO conferred partial protection against P. yoelii 17XL challenge in mice. |
Immunofluorescence assay, immunogold electron microscopy, in vitro growth inhibition assay, mouse immunization/challenge |
Infection and immunity |
Medium |
17785475
|
| 2007 |
In P. yoelii, ENO is present not only in cytosol but also in membrane, nuclear, and cytoskeletal fractions. At least five post-translationally modified isoforms were identified, of which at least three arise from phosphorylation. Different subcellular fractions showed distinct isoform profiles, suggesting PTMs govern subcellular targeting. |
Subcellular fractionation, 1D and 2D gel electrophoresis, Western blotting, immunofluorescence, Fe3+-based metal affinity chromatography (phosphoproteome isolation) |
Malaria journal |
Medium |
17437631
|
| 2007 |
Dimeric P. falciparum ENO can be dissociated into active, isolatable monomers by ~250 mM imidazole or hydrogen ions. Monomeric ENO differs from the dimer in specific activity, salt sensitivity, and thermal stability. Mg2+ protects yeast and rabbit muscle enolase but NOT P. falciparum ENO from imidazole-induced dissociation, revealing a parasite-specific difference in dimer interface stability. |
Gel filtration (Superdex-75), enzyme kinetics, in vitro dissociation assay, comparative biochemistry across species |
The FEBS journal |
High |
17371507
|
| 2009 |
In P. falciparum asexual stages, ENO is predominantly (≥85–90%) in the soluble (cytosolic) fraction, but in sexual stages it is mostly in the particulate fraction. ENO was additionally localized to the nucleus, food vacuole, cytoskeleton, and plasma membrane across life-cycle stages. |
Immunofluorescence assay, immunogold electron microscopy, Western blotting of subcellular fractions |
Malaria journal |
Medium |
19642995
|
| 2009 |
Deletion of the plant-like pentapeptide insert (104EWGWS108) from P. falciparum ENO resulted in ~100-fold decrease in kcat/Km, dissociation of the dimer into monomers, and near-abrogation of the protective antibody epitope recognized by serum from ENO-vaccinated mice. |
Site-directed deletion mutagenesis, enzyme kinetics, gel filtration, immunological assay (serum reactivity) |
Archives of biochemistry and biophysics |
High |
19268421
|
| 2011 |
ENO lines the ookinete surface in both P. berghei and P. falciparum. Surface ENO captures plasminogen from the mammalian blood meal via its lysine motif (DKSLVK) interacting with Kringle domains of plasminogen. This interaction is functionally required for mosquito midgut invasion: plasminogen depletion strongly inhibited oocyst formation, and rescue required enzymatically active (but not inactive) plasminogen, indicating that plasmin proteolytic activity facilitates invasion. |
Anti-enolase antibody inhibition assay, plasminogen depletion/rescue experiment, immunofluorescence, functional invasion assay |
Proceedings of the National Academy of Sciences of the United States of America |
High |
21949403
|
| 2011 |
A mosquito midgut receptor termed 'enolase-binding protein' (EBP) was identified that binds ookinete surface ENO (P. berghei). SM1-sensitive parasite clones required EBP for midgut invasion, placing surface ENO in the pathway of EBP-dependent midgut invasion. |
Phage display receptor identification, genetic epistasis (SM1-sensitive vs SM1-resistant clones), functional invasion assay |
Proceedings of the National Academy of Sciences of the United States of America |
Medium |
24474798
|
| 2011 |
ENO and actin were identified on the surface of live P. berghei ookinetes; phage display identified a conserved PWWP motif in peptides binding to ookinete surface ENO and actin, suggesting these surface proteins can engage PWWP-containing ligands. |
Phage display, overlay binding assay, immunofluorescence, electron microscopy |
Parasitology |
Low |
21816124
|
| 2013 |
P. falciparum ENO physically interacts with PfDegP (a serine protease) and PfHsp70 as demonstrated by co-immunoprecipitation and surface plasmon resonance; ENO and PfDegP co-localize by fluorescence microscopy, indicating ENO is a component of a stress-response protein complex. |
Co-immunoprecipitation (anti-bait), surface plasmon resonance, fluorescence co-localization |
The FEBS journal |
Medium |
24494818
|
| 2013 |
Food vacuole (FV)-associated P. falciparum ENO exists in three molecular weight forms (~50, 65, and 75 kDa). Mass spectrometry established post-translational modifications on FV-associated ENO: ubiquitination at K147 (with atypical trimeric ubiquitin linked via K6 of Ub2), phosphorylation at Y148, and acetylation at K142 and K384. The tri-ubiquitinated form associates predominantly with hemozoin. Cytosolic ENO is phosphorylated at S42; cytoskeletal ENO from P. yoelii at T337. |
Immunoprecipitation, Western blotting, mass spectrometry (MS/MS), subcellular fractionation |
PloS one |
High |
24009698
|
| 2011 |
P. falciparum ENO complements enolase-deficient yeast (Tetr-eno2), rescuing growth retardation, vacuolar fragmentation, and altered vacuolar protein expression. An enzymatically active monomeric mutant (Δ5Pfeno) fully restored cell growth but only partially rescued vacuolar fragmentation, indicating that the dimeric structure of ENO is required for optimal vacuolar function. |
Yeast complementation assay, immunoblotting of purified food vacuoles, mutant analysis |
Molecular and biochemical parasitology |
High |
21600245
|
| 2015 |
Replacement of Ser108 (within the 104EWGWS108 insert) with Gly or Ala disrupted predicted H-bonds with Leu49, shifted ENO from an active closed conformation to an open conformation, and markedly reduced Mg2+ binding affinity, demonstrating that Ser108 stabilizes the apo-ENO in an active closed conformation required for catalysis. |
Site-directed mutagenesis, enzyme kinetics, conformational analysis, structural modeling |
The FEBS journal |
High |
25787157
|
| 2015 |
The pentapeptide insert 104EWGWS108 of P. falciparum ENO constitutes the binding site for PWWP-motif-containing peptides from ookinete surface phage display. Deletion of the insert (Δ-rPfeno) abolished PWWP peptide binding; NMR chemical shift perturbation and intermolecular docking confirmed the insert as the recognition motif. Homologous PWWP-domain proteins (perlecan, laminin, peritrophin) in the mosquito peritrophic matrix are proposed as natural ligands. |
Binding assay (recombinant protein vs deletion mutant), NMR chemical shift perturbation, intermolecular docking |
Insect biochemistry and molecular biology |
Medium |
26592350
|
| 2016 |
Biliverdin (BV) binds directly to recombinant P. falciparum ENO at a single site (isothermal titration calorimetry) and acts as a non-competitive inhibitor of ENO activity, implicating ENO as a molecular target for BV-mediated inhibition of parasite glycolysis. |
Isothermal titration calorimetry, enzyme kinetics (inhibition assay), molecular modelling |
Scientific reports |
Medium |
26915471
|
| 2017 |
Mutation of the two tryptophan residues (W105 and W107) in the 104EWGWS108 insert to alanines or lysines caused near-complete loss of ENO catalytic activity and dissociation of the dimer into monomers. Molecular modeling indicated W105 forms π-cation bonds with R340 and Y46, and that loss of these interactions disrupts the inter-subunit interface (reducing docking energy ~4 kcal/mol), causing dimer dissociation and active-site disruption. |
Site-directed mutagenesis, enzyme kinetics, gel filtration, molecular modeling |
FEBS open bio |
High |
28680804
|
| 2008 |
2D-DIGE proteomic analysis of P. falciparum schizont-stage parasites identified ENO as one of several proteins represented by multiple isoforms in different spot positions, with distinct temporal abundance profiles, consistent with post-translational modifications producing functionally distinct forms during intra-erythrocytic development. |
2D-DIGE, mass spectrometry identification |
Genome biology |
Low |
19091060
|
| 2021 |
Enrichment of P. falciparum native proteins using a 5' cap affinity matrix identified ENO as the second most enriched protein after eIF4E. However, recombinant ENO did not demonstrate direct 5' cap-binding activity, indicating ENO associates indirectly with the 5' cap complex in asexual-stage parasites. |
5'-cap affinity pulldown, proteomic analysis, recombinant protein cap-binding assay (negative result for direct binding) |
Molecular and biochemical parasitology |
Medium |
34890716
|
| 2015 |
During P. berghei gametogenesis, ENO undergoes phosphorylation changes detected by 2D electrophoresis and phospho-specific Western blotting; TiO2 phosphopeptide enrichment and tandem MS identified specific phosphorylation sites in ENO during this differentiation process. |
2D electrophoresis, phospho-specific immunoblotting, TiO2 phosphopeptide enrichment, tandem mass spectrometry |
Experimental parasitology |
Medium |
26008612
|