Functions as a 2-dehydro-3-deoxy-D-pentonate aldolase. 2-dehydro-3-deoxy-D-arabinonate = glycolaldehyde + pyruvate Disruption mutant has reduced ability to catabolize D-xylonic acid. YjhH-yagE double mutant cannot use D-xylonate as the sole source of carbon. Belongs to the DapA family. Extended N-terminus.