May be involved in recognition between pollen-stigma and pollen tube-style cells. Expressed in tapetum and pollen grains. Not detected in petals, roots or leaves. Expressed at late stages of pollen development. Up-regulated during pollen germination and pollen tube growth. Regions 91-102 and 109-130 are immunodominant T-cell epitopes. Mutations in the C-terminus (135-145) reduce allergenic activity but do not change the ability to stimulate allergen-specific T-cells. N-glycosylated; contains high mannose (Man(7)-GlcNAc) and partially fucosylated complex glycans (GlcNAc-Man(3)-Xyl-GlcNAc). Complex glycans may contribute to the antigenicity. Exists both in a glycosylated and in a non-glycosylated form. Ole e 1 and Ole e 1.0103 are the only non-glycosylated isoallergens. A second potential glycosylation site exists at position 50 in cv. Bella de Espana and cv. Hojiblanca. Several isoforms of the allergen exist due to polymorphism. Causes an allergic reaction in human. Major allergen from olive pollen. Important in Mediterranean countries. Replacement of several other amino acids by Ala has little or no effect on IgG binding. Belongs to the Ole e I family.