Functions as soluble gibberellin (GA) receptor. GA is an essential hormone that regulates growth and development in plants. Binds with high affinity the biologically active gibberellin GA4, but has no affinity for the biologically inactive GAs. In response to GA, interacts with specific DELLA proteins, known as repressors of GA-induced growth, and targets them for degradation via proteasome. Seems to be required for GA signaling that controls root growth, seed germination, stem elongation and flower development. Partially redundant with GID1B and GID1C. Interacts (via N-terminus) with the DELLA proteins GAI, RGA, RGL1, RGL2 and RGL3 (via N-terminus) in a GA-dependent manner. Widely expressed. No visible phenotype under normal growth condition. Belongs to the 'GDXG' lipolytic enzyme family.