本酶催化的反应为Cleavage Of Poly(4-Deoxy-alpha-L-Erythro-Hexopyranuronoside) Oligosaccharides With 4-Deoxy-alpha-L-Erythro-Hex-4-Enopyranuronosyl Groups At Their Non-Reducing Ends Into 4-Deoxy-alpha-L-Erythro-Hex-4-Enopyranuronate Monosaccharides.系统名称为Alginate Oligosaccharide 4-Deoxy-alpha-L-Erythro-Hex-4-Enopyranuronate-(1->4)-Hexananopyranuronate Lyase,该酶通过从非还原端反复去除不饱和残基、直到只剩不饱和单糖,来降解褐藻酸裂合酶(EC 4.2.2.3和EC 4.2.2.11)作用于褐藻酸产生的不饱和低聚糖。该酶催化β-消除反应,在去除已有的不饱和非还原端后生成新的不饱和非还原端。