Multifunctional enzyme that acts as an enolase involved in the metabolism and as a positive regulator of cold-responsive gene transcription (PubMed:12032082). Binds to the cis-element the gene promoter of STZ/ZAT10, a zinc finger transcriptional repressor (PubMed:12032082). (2R)-2-phosphoglycerate = H2O + phosphoenolpyruvate Mg(2+) is required for catalysis and for stabilizing the dimer. Carbohydrate degradation; glycolysis; pyruvate from D-glyceraldehyde 3-phosphate: step 4/5. Homodimer. Found in circular or rod-shaped bodies that colocalizes with mitochondrion marker. Belongs to the enolase family.