本酶催化的反应为Exohydrolysis Of The alpha-L-Rha-(1->4)-alpha-D-GalA Bond In Rhamnogalacturonan Oligosaccharides With Initial Inversion Of Configuration Releasing beta-L-Rhamnose From The Non-Reducing End Of Rhamnogalacturonan Oligosaccharides.系统名称为Rhamnogalacturonan Oligosaccharide alpha-L-Rha-(1->4)-alpha-D-GalA Rhamnohydrolase,该酶是棘孢曲霉 Aspergillus aculeatus 中鼠李聚糖半乳糖醛酸 I 降解系统的组成部分。