Aspartic proteinase that can use azocasein as substrate and regulates endogenous sugar levels (e.g. sucrose, glucose and fructose) by modulating starch accumulation and remobilization (PubMed:22987884). Influences general morphology and development (PubMed:22987884). Repressed by pepstatin A. Optimum pH is 6. Expressed with a pronounced diurnal rhythm characterized by a peak at the end of the day and early night (at protein level). Slightly induced by sucrose (Suc). Belongs to the peptidase A1 family. Truncated N-terminus.